石油实验地质

2008, 30(6)

Abstract(933) PDF-CN(690)

Abstract:

SELECTION OF PETROLEUM EXPLORATION AREA IN OFFSHORE CHINA——IN TERMS OF THE ANALYSIS OF THERMAL SIMULATION EXPERIMENTS AND GENETIC RESOURCES ASSESSMENT

Zhu Weilin, Huang Zhengji, Tong Zhigang, Wang Yujun

2008, 30(6): 537-541. doi: 10.11781/sysydz200806537

Abstract(2388) PDF-CN(826)

Abstract:
The authors attempt to provide some suggestions to offshore China exploration based on the analysis of hydrous pyrolysis and subsequent genetic resources assessment.Hydrous-pyrolysis experiments were conducted in closed-system condition on the Tertiary lacustrine,coal measure strata and marine source rocks from six petroliferous basins to acquire information relating to hydrocarbon generation stages,potentials,kinetics and yield ratios.In conjunction with petroleum geological setting,resources potentials of each basin were evaluated by genetic method on the basis of hydro-pyrolysis results.The evaluation results show that the Bohai Bay Basin is the richest in petroleum resources,followed by Pearl River Mouth Basin,East China Sea Basin,Beibuwan Basin,Qiongdongnan Basin and Yinggehai Basin.Bohai Bay Basin,Pearl River Mouth Basin,East China Sea Basin and Beibuwan Basin with well-developed lacustrine source rocks are the promising petroleum exploration areas.

RETHINKING THE PRACTICE OF PETROLEUM EXPLORATION IN THE HEXI CORRIDOR AREA

Lei Ming, Wei Wei, Shu Zhiguo, He Xipeng

2008, 30(6): 542-546. doi: 10.11781/sysydz200806542

Abstract(3216) PDF-CN(970)

Abstract:
By recalling the practice of petroleum exploration for more than half century in the Hexi Corridor area,the successful experiences and failure reasons were summarized.It was pointed out that the Hexi Corridor area was dominated by the modified continental medium to small basins,with complicated geological conditions.Petroleum exploration in the area should be started on basis of resumed basinal prototypes and advanced technology.The source rocks and basin evolution should be highlighted,and 3 D exploration and dynamic modification should by carried out for successful petroleum exploration in the area.

STUDY OF THE EVOLUTION PROCESS OF THE ORDOVICIAN OIL RESERVOIR IN THE TAHE OILFIELD, THE TARIM BASIN

Lü Haitao, Zhang Weibiao, Zhang Dajing, Lin Zhongming, Zhao Xikui, Li Kun

2008, 30(6): 547-551. doi: 10.11781/sysydz200806547

Abstract(2964) PDF-CN(841)

Abstract:
The Ordovician oil reservoir in Tahe Oilfield,the northern Tarim Basin is so far the largest marine carbonate reservoir in China.Its main output layer is the karstic Lower-Middle Ordovician limestone.Based on the study of the Ordovician karstic reservoir rock,oil distribution,oil charge epoch,and considering the related study of structure and trap,it is concluded that the oil reservoir has been thrice charged,its evolution process can be summarized as "late Caledonian-early Hercynian oil accumulation and alteration-late Hercynian oil filling and adjustment-late Himalayan oil filling and readjustment".The large-scale palaeo-reservoir accumulated and altered in the late Caledonian-early Hercynian period is the basis of nowadays Ordovician heavy oil reservoir in the Tahe Oilfield.As a result of multiple oil charge and adjustment,the distribution of the Tahe Ordovician oils is complex enough.

EXPLORATION ACTUALITY AND COUNTERMEASURE OF THE TRIASSIC OIL RESERVOIRS IN TAHE OILFIELD OF THE TARIM BASIN

Ding Yong, Wang Yunchen, Huang Jiwen

2008, 30(6): 552-556. doi: 10.11781/sysydz200806552

Abstract(2497) PDF-CN(753)

Abstract:
The Triassic traps were multiplex with mainly compounded types in Tahe Oilfield of the Tarim Basin.Structural traps generally were with low amplitude and small close area.Lithologic traps were mainly controlled by sedimentary facies and sands pinchout.The sand thickness of lithologic traps was mostly less than 20 meters.The burial depth of the Triassic mostly was more than 4200 meters.Deep burial,small trap area,low amplitude,difficult recognition of thin sand layer,uneven distribution of pools were the difficult factors of the Triassic exploration.By the means of consolidating basic research,including the establishing of sequence framework,indepth research of seismic amplitude,identifying of low amplitude traps,identifying of nonstructural trap,study of sands body tracing and sedimentary subfacies,and so on,some good results have been achieved in the Triassic exploration in Tahe oilfield.

THE RELATIONSHIP BETWEEN THE DIAGENESIS OF UPPER PALAEOZOIC RESERVOIR SANDSTONES AND THE PRODUCTION CAPACITY IN DANIUDI GAS FIELD, THE ORDOS BASIN

Liu Weixin, Wang Yanbin, Zhang Wentao, Yang Qi, Zhang Qinzeng

2008, 30(6): 557-563. doi: 10.11781/sysydz200806557

Abstract(5158) PDF-CN(941)

Abstract:
Based on analysis of petrology,diagenesis,pore structure,microfracture and relationship with the gas yield of the Upper Palaeozonic reservoir sandstones in Daniudi Gas Field,Northern Ordos Basin,fine diagenetic difference exists on Upper Palaeozoic potential reservoir.The compaction is the main diagenesis resulting in pore and permeability lost,cementation greatly changes the pore structure and further reduces porosity and permeability although dissolution may improves the reservoir quality to some extent.The cementation type and strength exhibit difference with stronger quart and relatively less carbonates cementation in Carboniferous Taiyuan Formation(C₁t),and with less quart and relatively stronger carbonates cementation in Lower Shihezhi Formation(P₁x).Pore structure analysis shows that the Third and Second Member of Lower Shihezhi Formation(P₁x³ and P₁x²) with larger permeability than P₁x¹ and other reservoirs is related with the microfractures contributing to higher production capacity in P₁x³ and P₁x².

CONTROLS OF THE CALEDONIAN PALEOUPLIFT TO THE SINIAN -LOWER PALAEOZOIC RESERVOIRING CONDITIONS IN JIANGHAN PLAIN

Li Changhong

2008, 30(6): 564-567574. doi: 10.11781/sysydz200806564

Abstract(2328) PDF-CN(807)

Abstract:
The study on the sedimentary filling and evolution in and around Jianghan Plain indicated that the Sinian-Lower Paleozoic source rocks and reservoirs in Jianghan Plain were controlled by the Caledonian paleouplift.The source rocks occured mostly in the deep depression area adjacent to the southern and northern flanks of the paleouplift,rather than in the paleouplift.Due to the paleouplift,the Sinian Doushantuo Formation was laterally significantly different in source rock from the Lower Cambrian Niutitang Formation.The source rocks in the depression area were evolved earlier than those in the slope belt and paleouplift.In general,the source rocks were developed earlier in the south and west than in the north and east.In the paleouplift,tide flat-lacustrine facies of restricted platform were dominant,favorable for development of dolomitic reservoirs.As a result of shallow waters and frequently changed eustatic sea level in and around the paleouplift,the dolomitic reservoirs were reworked with multi-phase karstifications during diagenesis,thus improving the reservoirs;such good reservoirs were typified by the Sinian Dengying Formation,Lower Cambrian Shilongdong Formation,and Upper Cambrian controlled by the Caledonian paleouplift.The Caledonian paleouplift was considered as a favorable destination for migration and accumulation of early liquid hydrocarbon,which was important for a petroleum exploration breakthrough of the Sinian-Lower Paleozoic reservoirs in Jianghan Plain.

LATE DEVONIAN SEDIMENTARY EVOLUTION IN THE TARIM BASIN AND ITS MARGINS

Xu Jie, He Zhiliang, Guo Jianhua, Liu Chensheng, Guo Yuancao, Su Diaohong

2008, 30(6): 568-574. doi: 10.11781/sysydz200806568

Abstract(2015) PDF-CN(783)

Abstract:
Based on a lot of outcrops investigation,cores observation and well logs analysis,the Donghetang Formation is divided into the standard typeⅠsequence with a complete transgressive-regressive cycle.It corresponds to sedimentary strata of Ⅲ-grade sea-level cycles.It is composed of lowstand system tract(LST),transgressive system tract(TST) and highstand system tract(HST).The lowstand system tract is subaerial fluvial deposit system with limited distribution.The transgressive system tract is mainly composed of shore deposit controlled by tide.A series of shallowing and fining upward parasequences constitute the spanking parasequence group.The highstand system tract is mainly composed of wave-controlled shore deposit.A series of shallowing and thickening upward parasequences constitute the retrograding parasequence group.Additionally,there are alluvial fan,alluvial plain and fan delta deposition system in the basin edge.

MECHANISM OF TERNARY FACTORS COUPLING FOR CONTROLLING RESERVOIR AND ANALYSIS OF BENEFICIAL EXPLORATION AREAS——AN EXAMPLE OF THE EOGENE STRATIGRAPHIC RESERVOIR OF QIKOU SAG IN HUANGHUA DEPRESSION OF THE BOHAI BAY BASIN

Pu Xiugang, Liu Sa, Zhou Jiansheng, Zhou Lihong, Liao Qianjin, Wang Zhensheng, Xiao Dunqing, Zha Ming, Yang Zhibin

2008, 30(6): 575-579584. doi: 10.11781/sysydz200806575

Abstract(3540) PDF-CN(809)

Abstract:
Applying the method of single factor analysis on the basis of comprehensive evaluation with structure,sandstone,and the model of hydrocarbon accumulation,the mechanism of ternary factors coupling for controlling reservoir has been understood,and beneficial exploration areas for Paleogene stratigraphic reservoir of Qikou Sag in Huanghua Depression of the Bohai Bay Basin were revealed.It indicated that the major controlling factors of forming reservoir could fall into three categories: first was oil source including hydrocarbon-generating,expulsion and transportation system;the second was physical property of reservoir including properties of porosity,permeability and characteristics of pore structure;the third was whether the trap was effective or not(storage oil or not)and the closing height of trap(deciding the output proportion of oil and water).The major factor of deciding distribution of traps were whether paleo structural setting was matched with depositional systerms.New patterns of "Ternary Factors Coupling" controlling reservoir-forming can be used to express the essence of pool-forming.There are large scale beneficial exploration areas for Paleogene stratigraphic reservoir in Qikou Sag such as Banqiao-Binhai faulted-nose,Binhai slope area and Chengbei fault ramp.

DIAGENETIC ENVIRONMENT AND OIL AND GAS ACCUMULATION PERIOD OF LIANGLITAGE FORMATION IN THE SOUTH AREAS OF TAHE OILFIELD OF THE TARIM BASIN

Yuan Yuling, Huangpu Hongying

2008, 30(6): 580-584. doi: 10.11781/sysydz200806580

Abstract(3180) PDF-CN(815)

Abstract:
Lianglitage Formation of the Upper Ordovician in the south areas of Tahe Oilfield of the Tarim Basin was consisted of a set of carbonates.By means of study of bore cores and thin sections observation,it indicated that the carbonates of Lianglitage Formation were experienced meteoric vadose zone,mixing-water diagenetic environment,karst,shallow and deep buried diagenetic environment.Study of the fluid inclusions showed that there were three times of oil activity in shallow,deep buried diagenetic period and late diagenetic period.With data of sedimentary facies,slurry leaking,karst,reservoir porosity and permeability,oil and gas output,it was concluded that Lianglitage Formation possessed potential for hydrocarbon exploration and development.

DEVELOPMENTAL FEATURES AND THE RELATIONSHIP BETWEEN FRACTURES AND GAS ACCUMULATION IN THE XUJIAHE FORMATION OF GUANG'AN GASFIELD, THE SICHUAN BASIN

Bian Congsheng, Wang Hongjun

2008, 30(6): 585-590. doi: 10.11781/sysydz200806585

Abstract(3249) PDF-CN(1088)

Abstract:
The fractures have a great effect on gas migration and accumulation in compacted sandstone of Xujiahe Formation,the Sichuan Basin.Developmental features and mechanical formation process of fractures determined the relationship of effective reservoirs and gas accumulation in compacted sandstone.Based on it,the fractures in sandstone reservoirs of T₃x⁴ and T₃x⁶ in the Sichuan Basin are discusseded according to core observation and imaging logging analysis.According to researches of fractures character and regional stress fields indicated that there are two stages of fractures formation,which are tension fractures associated with folds in the late Yanshanian period,and shear ones associated with faults in the Himalayan period.In Well GAN5 area of T₃x⁴,the first stage of fractures is formed at the same time with peak hydrocarbon-generation period,therefore,the fractures can be favorable to the forming of effective reservoirs and the gas migration.However,in Well GAN124 area,the fractures are formed after the effective reservoirs occurrence,so the fractures must be combinated with the effective reservoirs,and can adjust and reshape the gas reservoir which have already been formed.

THE PROGRESS ON THE STUDY OF LACUSTRINE SOURCE ROCKS

Zhang Linye

2008, 30(6): 591-595. doi: 10.11781/sysydz200806591

Abstract(2685) PDF-CN(1079)

Abstract:
There is distinctive heterogeneity in the deposition of lacustrine source rocks.The occurrence of high-quality lacustrine source rocks with rich-organic matter plays an important role in controlling the formation of large oil fields.It has been widely concerned about the mechanism forming rich-organic matter in lacustrine source rock and has achieved significant advance.The deposition of high-quality source rocks has close relationships with the variation of the capacities of lacustrine basins during their evolution,paleolacustrine physicochemical properties,nutrition origin of paleo-productivity,periodic variation of climate and so on.In order to study the formation mechanism of high-quality source rocks,we should try to find out the dependence relations between organic compounds and inorganic elements in sedimentary rhythms in rich-organic matter strata,analyse the coupling relation between cyclicity and incident during geologic succession,inquire into the inherent connection among geologic environment,biogenetic derivation and the formation of rich-organic matter strata.

SOURCE ANALYSIS OF OIL SEEPAGE AND BITUMEN ORIGINATING FROM MARINE LAYER STRATA IN GUANGYUAN AREA, THE NORTHWEST SICHUAN BASIN

Rao Dan, Qing Jianzhong, Tenger, Zhang Meizhen

2008, 30(6): 596-599605. doi: 10.11781/sysydz200806596

Abstract(2893) PDF-CN(853)

Abstract:
The reservoirs of Cambrian-Triassic from the Changjianggou section contain quantities of solid bitumen in Guangyuan area,the northwest Sichuan Basin.The oil seepage is abundant.It is suggested by research of absolute quantification analysis on the biomarkers of saturated hydrocarbon and aromatics that saturated hydrocarbon biomarker parameters of solid bitumen in Lower Cambrian and seepages in Devonian and Lower Permian Maokou Formation have similar characters.The results show that there is early hydrocarbon filling from Lower Cambrian source rock.There exist certain differences of aromatic biomarkers among them,which is perhaps influenced by late hydrocarbon filling from Upper Paleozoic besides of maturities.There are significant difference in biomarkers of saturated hydrocarbon and aromatics between seepages of Lower Triassic Feixianguan Formation and bitumen and seepages of Paleozoic.There is genetic relationship between seepage in Feixianguan Formation and source rock from Dalong Formation of Lower Permian,which also perhaps originates from Lower Triassic source rocks.

ANALYSIS OF DEEP-SEATED HYDROCARBON RESOURCE POTENTIAL OF PALAEOGENE IN THE BAXIAN SAG, CENTRAL HEBEI PROVINCE

Li Xin, Zheng Shuhong, Peng Ning, He Yaqin, He Shuping, Qiao Xiaoxia

2008, 30(6): 600-605. doi: 10.11781/sysydz200806600

Abstract(1856) PDF-CN(812)

Abstract:
Middle and lower Es³ and upper Es⁴ dark shale was previously considered as the main source rocks in Baxian of Central Hebei Province.Middle and lower Es⁴ dark shale with great thickness was discovered through the drilling of Well Xinglong-1.It is indicated through detailed geochemical study on this set of dark shale that its organic carbon content is 0.6%～6%,pyrolysis hydrocarbon generation potential 0.5～14mg/g and organic matter type Ⅱ₂-Ⅱ₁.It is obvious that it is medium-good source rock.It is indicated through organic matter maturity research on source rocks in Well Xinglong-1 that its maturity threshold is at 3200m,oil generation peak at 4700m and condensate and wet gas generation at about 5100m.In Well Xinglong-1,middle and lower Es⁴ dark shale has entered into the stage of condensate and wet gas.Therefore,this set of source rocks has hydrocarbon generation capacity.Basin simulation approach is used to measure hydrocarbon resource of middle and lower Es⁴ in the Baxian Sag,and the petroleum resource incremental is 22 million tons and natural gas resource incremental is 56.1 billion cubic meters.Thus,deep layer exploration in the Baxian Sag becomes more important.

KINETICS OF HYDROCARBON GENERATION OF MARINE SOURCE ROCKS IN SOUTH CHINA

Jiang Qigui, Wang Yanbin, Qin Jianzhong, Wang Qin, Zhang Caiming

2008, 30(6): 606-610. doi: 10.11781/sysydz200806606

Abstract(1613) PDF-CN(818)

Abstract:
With Rock-Eval 6 and Optkin kinetics software,the kinetics analysis on four types of kerogens of marine hydrocarbon source rocks in South China were carried out.The results showed that,in the similar maturity period,the hydrocarbon generation activation energy of kerogen was Ⅲ>Ⅱ₂>Ⅱ₁>Ⅰ;the ability of hydrocarbon generation was Ⅰ>Ⅱ₁>Ⅱ₂>Ⅲ;the span of generating effective hydrocarbon activation energy was ΔE_Ⅰ<15kJ/mol,15 kJ/mol<ΔE_Ⅱ₁<20kJ/mol,20kJ/mol<ΔE_Ⅱ₂<30 kJ/mol,ΔE_Ⅲ>30kJ/mol;the span of generating effective hydrocarbon temperature was ΔT_Ⅰ≤65℃,65℃≤ΔT_Ⅱ1≤75℃,75℃≤ΔT_Ⅱ₂≤85℃,ΔT_Ⅲ≥110℃.The time of hydrocarbon generation conversion rate to reach 10% was Ⅲ<Ⅱ₂<Ⅱ₁<Ⅰ;and the type Ⅰ kerogen first reached to 90% conversion rate,and then the typeⅡ₁,type Ⅱ₂ and type Ⅲ of kerogen.The character of hydrocarbon generation activation energy distribution of kerogen was determined by their element composition and organic high molecular structure.The hydrocarbon generation speed of good marine source rocks was very fast.

THE GEOCHEMICAL CHARACTERISTIC AND GENETIC TYPE OF CRUDE OIL IN THE WESTERN SAG OF THE LIAOHE BASIN

Mu Guoyan, Zhong Ningning, Liu Bao

2008, 30(6): 611-616. doi: 10.11781/sysydz200806611

Abstract(2165) PDF-CN(814)

Abstract:
The physical property and group composition of the crude oil in the Western Sag,Liaohe Basin possess the characteristics,such as density,consistency and wax content increase,while saturated hydrocarbon content decrease and nonhydrocarbon and asphaltene content increase along with the oil from deep to shallow layer,from center to boundary of the sag.Saturated hydrocarbon has various spectrums,such as single peak and double peak,front and queen,smoothing and serration,as well as biodegradation.The rate of Pr/Ph in the south is higher than the north.The distribution of C₂₇-C₂₉ regular sterane is dominated by right line ramp type,and only few samples have higher C₂₈ content in the south.Summing up the physical property and geochemical behavior,the crude oil are divided into two types based on biologic source and sedimentary environment,then divide these two types into three subtypes based on maturity and biodegradation.The results will provide dependable foundation to correlation of oil-source rock and exploration.

EFFECT OF IGNEOUS ROCKS ON SOURCE ROCKS AND HYDROCARBON GENERATION IN THE LANGGU SAG, CENTRAL HEBEI PROVINCE

Wang Jian, Ma Shunping, Han Guiling, Wang Quan, Dong Xiongying

2008, 30(6): 617-620. doi: 10.11781/sysydz200806617

Abstract(3369) PDF-CN(736)

Abstract:
Organic geochemical data analysis is conducted on source rocks in intrusive igneous rock interval in the Langgu Sag,Central Hebei Province.The results indicate that intrusion of igneous rocks has distinct effect on Ro and H/C atomic ratio and less effect on HC/TOC and I_H,and it only shifts the oil generation peak and upper limit of wet gas belt to an earlier time instead of inducing overmaturation of organic matters.In this way,intrusion of igneous rocks does not damage source rocks or existing oil and gas reservoirs,but increases maturity of organic matters fast by means of short-term baking,and especially for those source rocks at immature-low maturity stage.Therefore,it is ahead of normal evolution stage.In addition,multiple intrusions of igneous rocks can thicken source rocks of hydrocarbon generation stage,which is more favorable for hydrocarbon generation.

EVALUATION ON EXCELLENT MARINE HYDROCARBON SOURCE LAYERS IN SOUTHEAST AREA OF THE SICHUAN BASIN——AN EXAMPLE FROM WELL D-1

Fu Xiaodong, Qing Jianzhong, Tenger

2008, 30(6): 621-628642. doi: 10.11781/sysydz200806621

Abstract(1860) PDF-CN(1105)

Abstract:
The synthetical organic geochemistry section was established by the data of TOC,chloroform bituminous "A",and hydrocarbon generation potential of the drilled marine sequences of Well D-1 in the southeast area of the Sichuan Basin.Synthetical analysis based on the organic geochemistry section of Well D-1,combining with regional geological information indicated that there were three sets of excellent marine source rocks developed in the area,i.e.the black mudstones and black marls of the Upper Permian Longtan Formation,black mudstones of the Lower Silurian bottom Longmaxi Formation and black mudstones of the Lower Cambrian bottom Niutitang Formation.The bituminous algal dolostone of the Sinian Dengying Formation and the bioclastic-limestone of the Permian Qixia Formation was believed to be good secondary hydrocarbon generation source because of their high solid bitumen and chloroform bituminous "A" contents.Furthermore,the mudstones of the middle Longmaxi Formation were the good source rocks.Muddy limestone of the lower Siniulan Formation and lime-mudstones of upper Longmaxi Formation were medium source rocks.Existence of many sets of excellent hydrocarbon source rocks and good secondary hydrocarbon generation source can supply abundant matters for the hyrocarbon accumulation in this area.

INVESTIGATION ON PREDICTION METHODS OF FAVORABLE AREA FOR PETROLEUM MIGRATION AND ACCUMULATION——TAKING THE DONGYING SAG OF BOHAI BAY BASIN AS AN EXAMPLE

Tan Caiping, Jiang Xingge, Chen Yongfeng, Guan Defan, Xu Xuhui

2008, 30(6): 629-635. doi: 10.11781/sysydz200806629

Abstract(3330) PDF-CN(768)

Abstract:
Integrated researches of formation pore fluid pressure field on main geological evolution stages occurred in the Dongying Sag of the Bohai Bay Basin,its exploration status and sedimentary characteristics,sandstone rebounding amount caused by the erosion unloading during the Dongying phase of the Oligocene and the Minghuazhen phase of the Pliocene and their interaction analysis of formation pore fluid paleo-pressure field,the paper proposes 2 more effective methods of predicting hydrocarbon migration and accumulation for petroliferous basins which are mainly composed of sandstone and mudstone.Two methods are follows as:1)Predicting favorable direction of petroleum migration based on dynamics research of pressure field differentiated of hydrocarbon rocks reservoir area at stages of basin uplift denudation after forming hydrocarbon by sustainable subsidence;2)Predicting favorable zones of hydrocarbon accumulation based on dynamics research of sandstone rebounding amount at stages of basin uplift denudation after forming hydrocarbon by sustainable subsidence,and meanwhile,combining with the distribution of reservoir cap rocks at the same stage in geological time.

METHODS OF ERODED STRATA THICKNESS RESTORATION IN SEDIMENTARY BASINS

Yuan Yusong, Zheng Herong, Tu Wei

2008, 30(6): 636-642. doi: 10.11781/sysydz200806636

Abstract(2274) PDF-CN(1401)

Abstract:
Multi-type restoration methods to estimate the thickness of eroded sedimentary rocks can be categorized into four types:geothermal,geological,geophysical and geochemical methods based on paleothermal index,stratigraphical or sedimentary principles,logging or seismic data and diffussion or accumulation theory,respectively.Every type has its own effective conditions or limits in application to estimate the eroded thickness of rocks.In practical application,it should make sure to select the most effective methods or their combinations according to development,structural evolution and unconformity surface of sedimentary basins.It was considered by integrated analysis that paleo-temperature vitrinite reflectence(R_o) and paleo-temperature gradiends of apatite fission-track(AFT) are primary choices under conditions of strata reliabilities in combination with basic condition that lower tectonic layer underwent higher paleo-temperature than upper sequence.As for Mesozoic-Cenozoic sedimentary basins,We can choose porosity methods and/or acoustic travel interval time in combination with paleo-temperature gradients to carry out restoration of eroded thickness.And for multicycle superimposed basins since Phanerozoic,we should carefully analyse sedimentary features and evolution history of basins,qualitatively constraint ranges of eroded thickness using stratigraphic correlation methods then quantitatively calculate using geothermal data and/or sedimentary wave analysis.

STUDY OF SIMULATION EXPERIMENT FOR CARBONATE ROCKS DISSOLUTION IN BURIAL DIAGENETIC ENVIRONMENT

Jiang Xiaoqiong, Wang Shuyi, Fan Ming, Zhang Jianyong, Guan Honglin, Bao Yunjie

2008, 30(6): 643-646. doi: 10.11781/sysydz200806643

Abstract(3697) PDF-CN(1007)

Abstract:
Under the condition of the same pressure and different temperature where acetic acid,CO₂ and H₂S as solution,respectively,the experiments of dissolution for different type carbonate rocks have been performed the ability of dissolution of the dolostone is lower compared with the limestone.And the ability of dissolution of transitional type carbonate rocks is between limestone's and dolostone's.The results show that the ability of dissolution of dolomite is lower than calcite.Under the condition of the same temperature and different pressure where acetic acid as solution,when pressure is between 0.2 and 30MPa,the results show that the ability of dissolution of dolostone is lower than limestone.However,when pressure is 50MPa,the dissolution abilities of samples obviously increase.The increased extent is characterised that dissolution intensity of the dolostone is most large,intensity of limestones is most low and intensity of algal limestone is between dolostones and limestones.Based on previous results presumed when pressure increases,the dissolution intensity of dolostones is more than the limestone.However,the microcrystalline limestone dissolution of different particle size indicates that the dissolution rate of large particle size is 1.49 times larger than that small size.All these show that the dissolution extent depends on the main factors of specific surface area caused by contaction of fluid and minerals besides of mineral composition.

2008 Vol. 30, No. 6

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