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1998 Vol. 20, No. 3

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THE STRUCTURAL STYLES AND THEIR ROLE IN HYDROCARBON ACCUMULATION OF THE YANQI BASIN, NW CHINA
Guo Zhaojie, Zhang Zhicheng, Qian Xianglin, Li Maosong
1998, 20(3): 205-209. doi: 10.11781/sysydz199803205
Abstract(2663) PDF-CN(339)
Abstract:
The Yanqi basin,which formed on the basis of South Tianshan orogenic belt in the Mesozoic,was a pull apart one.Since the Miocene Yanqi basin has been overthrusted from north by Tianshan belt and from south by Kuluktag belt because of the Himalayan orogenic event.The Yanqi basin is now one of foreland basins.A series of stepped thrusts and fault related folds occur in the Yanqi basin.The tectonic loadings resulted from the overthrusts induce source rocks of the Jurassic coalbeds and dark argillites to maturation period for hydrocarbon generation.We proposed that Yanqi basin is a favorable one for accumulation of oil and gas.
THE CHARACTERISTICS OF STRUCTURAL STYLES AND THEIR INFLUENCES ON OIL AND GAS ACCUMULATION OF THE WAN'AN BASIN IN THE SOUTHWESTERN SOUTH CHINA SEA
Zhang Guangxue, Bai Zhilin
1998, 20(3): 210-216. doi: 10.11781/sysydz199803210
Abstract(819) PDF-CN(284)
Abstract:
The paper described the characteristics of main tectonic movements and structural styles in each structural layer in the Wan'an basin in detail.Three tectonic movements including the Cretaceous Lile movement,the Middle Late Eocene Xiwei movement and the Late Miocene Wan'an movement occurred in the basin.The earlier Lile movement resulted in the basin's embryonic tectonics,the later Xiwei movement caused expansion of the continental margin fault depression,and the latest Wan'an movement lead to the former strata folded,block faulting,denuding and structural inversion.Most structural traps were formed in the latest movement.With occurring of main tectonic movement,there are three suites of tectonic layer in the basin,i.e.basement layer(under T5 or Tg),principal layer(between T3 and T5)and superficial layer in which various characteristics structural styles have been developed.In terms of hydrocarbon accumulation,the principal layer is the habitat due to its wide development of structural traps.
CHARACTERISTICS OF FAULTING RELATED TRAP TYPES IN THE TARIM BASIN
Duan Tiejun, Xu Hongjie, Wu Hong, Tang Huimin
1998, 20(3): 217-222. doi: 10.11781/sysydz199803217
Abstract(868) PDF-CN(303)
Abstract:
Above 60% oil/gas traps whose formation mainly has close relationship to faulting are developed concentratedly within the fault zone of the Tarim Basin.Faulting of different systems controls the types of oil/gas traps.Thrust decollement mainly results in stacking imbricate,fault bending,fault spreading and fault sliding folds,back thrusting in back thrusting blocks,back thrusting anticlines and tractive traps,and strike slip displacement in efflorescent and en echelon folds.They have become the important targets for the oil/gas exploration of the basin.
THE DISCOVERY AND SIGNIFICANCE OF NAPPE STRUCTURE FORMED IN THE INDO EARLY YANSHAN MOVEMENT IN THE BASEMENT OF HUANGHUA DOWN WARPED BASIN
Deng Qinglu, Wei Bize, Du Guoying, Wang Zhanqi, Xiao Dunqing, Su Junqing
1998, 20(3): 223-227. doi: 10.11781/sysydz199803223
Abstract(666) PDF-CN(324)
Abstract:
Nappe structure formed in the Indo early Yanshan movement were found in the north,the south and the inner platform fold belts of the North China platform.But it is not in document so far in the basement of the vast east basin of the platform.Based on the interpretation of seismic sections and the examination of core,the nappe structure form was discerned in the Kongxi buried hill in the Huanghua down warped basin.Typical elements of nappe structure,such as fault slope,fault flat,antithetic thrust,overlap beds,and so on,were found in the buried hill.As to the driving force of the nappe structure,the left slip motion of the Tanlu fault zone during the Indo early Yanshan movement was proposed.The confirmation of the nappe structure in the basement of the Huanghua basin may have implications to the further oil and gas exploration in that area.
TRAP CHARACTERISTICS AND FURTHER EXPLORATION OF CARBONIFEROUS GAS POOLS AT THE EASTERN FOOT OF HUAYINGSHAN MOUNTAIN
Chen Zongqing
1998, 20(3): 228-233. doi: 10.11781/sysydz199803228
Abstract(619) PDF-CN(233)
Abstract:
The exploration degree of Carboniferous system at the eastern foot of Huayingshan Mountain is higher.Twelve traps have been explored,and ten gas pools obtained.Only the traps at the northern sector of Lin produce water,and the circum mountain traps at the southern sector do not produce gases because of too thin residual thickness and the loss of reservoir.In the stable area of Carboniferous residual thickness at the northern sector,the gas pools are all tectonic traps which are dominated by host anticlinal traps and consistent with regional tectonics.In the changeable area of Carboniferous residual thickness at the southern sector,the gas pool traps are complex.Besides tectonic traps,strata host anticlinal compound,strata stacking fault compound,strata fault compound and unaka traps exist together with the change of residual thickness.Under certain conditions,solution lithologic traps or fault solution lithologic traps also occur.The targets of further exploration are mainly underfault overthrust,strata fault compound,strata host anticlinal compound,host anticlinal ane solution lithologic traps.
CHARACTERISTICS OF RESERVOIR SEDIMENTOLOGY IN THE SHA—3 MEMBER OF THE GAOSHANGBAO OIL FIELD
Ran Qiyu, You Xiuling, Yang Yong
1998, 20(3): 234-238. doi: 10.11781/sysydz199803234
Abstract(861) PDF-CN(293)
Abstract:
By study on the characteristics of reservoir petrology and sedimentology in target strata,the authors first expound that the sedimentary environment of the Sha 3 Member is river shore shallow lake environment,the sedimentary system belongs to lakeshore depositional system,and the sedimentary facies of the reservoir are braided river delta facies.This result has very important directive significance for the rolling development of the field and the evaluation of prospect area.
DIAGENESIS OF CARBONATE ROCKS ON PLATFORM MARGIN AND DEEP WATER SLOPE IN THE UPPER SINIAN ORDOVICIAN IN THE MIDDLE TO UPPER YANGTZE AREA
Hu Mingyi, Gao Zhenzhong
1998, 20(3): 239-247. doi: 10.11781/sysydz199803239
Abstract(570) PDF-CN(394)
Abstract:
Based on the study of petrology,using microprobe analysis,stable isotope of carbon and oxygen,inclusion analysis and geochemical analysis,the diagenesis of carbonates,such as cementation,dolomitization,on platform margin and deep water slope in the middle Yangtze platform were studied in detail.And the diagenetic environment was divided and the model of porosity evolution was proposed.
THE DISCOVERY OF PETROLEUM SEEPAGES IN WUYU BASIN IN TIBET AND ITS SIGNIFICANCE FOR HYDROCARBON EXPLORATION
Huang Zeguang, Zeng Huasheng, Tang Huimin, Yuan Yusong
1998, 20(3): 248-252. doi: 10.11781/sysydz199803248
Abstract(684) PDF-CN(301)
Abstract:
Recently,the birumen within Rigongla formation of Wuyu basin in Tibet and 500 meters of dark shale rocks in the basin have been discovercd.The geochemical analysis indicates that the quality of source rocks is favourable,the organism belongs to type Ⅱ and is dominated by low maturity and partly within the high maturity in evolution.Thte petroleum seepages(bitumen)come from the Rigorgla formation.Furthermore,the coal beds and coal bearing beds in lower part of Mangxiang formation of the basin are of favourable coal related hydrocarbon potential.It can be concluded that the generation,migration and accumulation once occured within the Wuyu basin and has shown a potential for oil and gas exploration.
GEOCHEMICAL SIGNIFICANCE OF ORGANIC SULFUR COMPOUNDS IN THE TARIM OILS
Zhu Yangming, Fu Jiamo, Sheng Guoying
1998, 20(3): 253-257. doi: 10.11781/sysydz199803253
Abstract(713) PDF-CN(323)
Abstract:
Aromatic fraction in more than 30 representative oils from the Tarim Basin are analyzed using GC/MS and gas chromatography with atomic emission detector(GC/AED).The analytical data shows that various kinds of oils are significantly different in concentration and distribution of organic sulfur compounds.Compared with the terrestrical oils,the marine oils are characterized by high amount of dibenzothiophenes(20%)and high dibenzothiophene/phenanthrene ratio(>0.35).By their higher values of these two para meters,Tazhong restricted bay(lagoon)oils can be distinguished from Tabei marine platform oils.These marine oils are poor in dibenzothiophene(DBT)compared to dimethylated homologs(DBDBT),reflecting the difference in oringinal organic matter and depositional enviroment.It is noted that the abundance benzothiophenes(BTs)relative to dibenzothiophenes(DBTs)varies in oils from different source rock lithologies,with oils derived from carbonate having higher value.MDR,a maturity indicator based on dibenzthiophenes in oils,is affected by mineral matrices,with coal derived oil having anomalous high value,and MDR1 and MDR2,3 are related to depositional environment and organic matter type.
A NEW TECHNIQUE OF RESERVIOR GEOCHEMISTRY AND ITS APPLICATION TO DEVELOPMENT OF XIDALIYA OILFIELD
Wei Fujun, Zhang Yunxia
1998, 20(3): 258-260. doi: 10.11781/sysydz199803258
Abstract(652) PDF-CN(277)
Abstract:
Many factors,such as depositional environment,maturation of organic matters,hydrocarbon migration and secondary alteration,may cause difference of petroleum fingerprint,i.e.the vertical and lateral difference in reservior.However,diffusion and density overturn can adjust the difference and reach a new dynamic balance.But close fault and rocks with low permeability will destroy the balance.Therefore,some geochemical information can be used to describe reservior,such as correlation of small beds,division of faults and flow units,water/oil contact,paleowater flow.It will provide useful information for development of Xidaliya Oilfield.
A COMPREHENSIVE METHOD OF MULTIPLE INFORMATION FOR TRACING GAS SOURCE—A CASE STUDY OF JIYANG DEPRESSION
Xiang Kui, Fan Qingzhen, Luo Guanghua
1998, 20(3): 261-266. doi: 10.11781/sysydz199803261
Abstract(606) PDF-CN(272)
Abstract:
Multiple information,such as carbon isotope,argon isotope,light hydrocarbon composition and other geological data,from 5 deep wells(4000m)of 3 areas in Jiyang depression was used to correlate natural gas with absorbed gas in source rocks directly and to correlate natural gas with associated gas in oil accumulation indirectly.The natural gas was traced effectively.The accumulation patterns of gas were proposed.
ANALYSIS OF DIAMONDOID HYDROCARBONS IN NATURAL GAS AND ITS APPLICATION TO YING QIONG BASIN
Fu Ning, Yu Xiaoguo, Zhao Shengrong
1998, 20(3): 267-271. doi: 10.11781/sysydz199803267
Abstract(816) PDF-CN(344)
Abstract:
The diamondoid hydrocarbons in natural gas were detected by technique of heavy hydrocarbon concentration of natural gas and MID/GC/MS analysis.On basis of measured diamantane and vitrinite reflectance of source rocks in Qiongdongna basin,the relationship between diamantane index and vitrinite reflectance(R°)were established.Undoubtedly,it will show great significance for determining the maturity of the condensate and natural gas of Ying Qiong basin.
A PRELIMINARY STUDY ON THE ACTIVATION ENERGY PARAMETERS OF GLOEOCAPSOMORPHA KEROGEN IN ORDOVICIAN SOURCE BEDS
Pu Xiugang, Gao Gang, Hao Shisheng
1998, 20(3): 272-275. doi: 10.11781/sysydz199803272
Abstract(703) PDF-CN(306)
Abstract:
The distribution of Low Paleozoic source beds,especially carbonate rock strata,is very wide in our country.But the geochemical evaluation for the distributive area of carbonate rocks is always a vulnerable spot.One of the important reasons is that it is difficult to obtain the accurate geochemical parameters due to the high overmaturity of carbonate rocks.In this pater,the lowmatured Gloeocapsomorpha kerogen of general distributive significance in Ordovician source beds is selected for pyrolysis experiment.A series of dynamic parameters(activation energy E,the changing relationship of frequency factor A to degradability X)of chemical reactions obtained have an obvious use for reference to the correct evaluation of oil/gas potential and hydrocarbon generation/hydrocarbon discharging history in Low Paleozoic carbonate rock strata.
COMPARISON OF THE HYDROCARBON GENERATING CHARACTERISTICS OF ALGAE KEROGEN IN CARBONATE ROCK AND IN MUDSTONE
Gao Gang, Hao Shisheng, PU Xiuyong
1998, 20(3): 276-281. doi: 10.11781/sysydz199803276
Abstract(710) PDF-CN(312)
Abstract:
By means of hydrothermal simulation,the similarities and differences of the hydrocarbon generating characteristics of algae kerogen in the media of carbonate rock and mudstone are analysed.There are small differences in the hydrocarbon compositions of liquid products,the gas chromatograms of saturated hydrocarbons and the characteristics of solid kerogen between carbonate rock and mudstone.The gas yield is obviously small in the medium of mudstone and water than in that of carbonate rock and water.The main reason is that a great amount of CO2 are formed in the medium of carbonate rock.The catalysis of clay mineral on gaseous hydrocarbons is revealed specifically by the fact that unsaturated hydrocarbons change into saturated hydrocarbons through hydrogen addition catalysis.This is more effective for low molecular methane.The catalysis of carbonate rock to unsaturated hydrocarbons and methane is not so good as mudstone.But it is more favourable to the generation of heavier gaseous hydrocarbons.Before the time to generate a great amount of oil,the oil generating amount of carbonate rock is high than that of mudstone.At the time of oil generating peak,the total liquid products of the both are almost equal.The oil generating peak of mudstone is generally consistent with or slightly later than that of carbonate rock.
THE RELATIONSHIP BETWEEN THE EVOLUTION OF CLAY MINERALS AND THE MATURITY OF SOURCE ROCKS IN THE LUNPOLA BASIN
Chen Ping, Fei Qi, Lu Yongchao
1998, 20(3): 282-286. doi: 10.11781/sysydz199803282
Abstract(661) PDF-CN(339)
Abstract:
On basis of study of type,assemblage and evolution of clay minerals in the Lunpola basin,in company with value of vitrinite reflectance,a relationship between the evolution of clay minerals and the maturity of source rocks was established.
NUMERICAL MODELING ON PRESSURIZING CAUSED BY HYDROCARBON GENERATION
Xu Sihuang, Mei Lianfu, Yuan Caiping
1998, 20(3): 287-291. doi: 10.11781/sysydz199803287
Abstract(1224) PDF-CN(330)
Abstract:
Generation of hydrocarbon from kerogen is one of important genetic types of abnormal pressure in source rock.Because the pressurizing caused by generation was taking place during the period of genera ting and expulsion,it is difficult to recover or calculate it directly.Usually it can be measured by numerical modeling.The mathematical model of pressurizing was built according to the physico chemical mechanism of generation.It shows that the more the generated hydrocarbon,and the more compact the source rock,the larger the intensity of pressurizing.The pressurizing caused by gas generation is stronger than that caused by oil generation.The pressurizing caused by generation can be modeled,and also the expulsion through microfracture caused by the pressurizing can be recovered by using this mathematical model.Numerical modeling on pressurizing caused by generation has been effectivelg applied in several typical petroleum basins in China.
APPLICATION OF THE THERMAL SIMULATION EXPERIMENT OF SOURCE ROCKS
Zhang Xusheng, Wang Yuankun, Zhou Yonghong
1998, 20(3): 292-296. doi: 10.11781/sysydz199803292
Abstract(676) PDF-CN(273)
Abstract:
In this paper,the samples of Hetian prospect in Xingjiang are taken as experimental samples,and those of Dongying region as standard samples.By using the experimental method of rapid thermal simulation,the hydrocarbon generating amount of source rocks in the area is evaluated preliminarily so as to provide basis for the next exploration targets.
A PRINCIPLE TO ESTIMATE A FEW SETS OF SUBSURFACE SYSTEMATIC JOINT SPACINGS AND ITS APPLICATION
Shan Yehua, Li Zhian
1998, 20(3): 297-304. doi: 10.11781/sysydz199803297
Abstract(699) PDF-CN(243)
Abstract:
In this paper,an optimum method is suggested to estimate a few sets of subsurface systematic joint spacings.Instead of fractured rock orientation,core data are used to estimate a few sets of joint spacings.In order to confirm the efficiency of this method,an ideal fracture model is set up.It is discovered that the product of joint spacings is estimated more accurately than joint spacings alone under the same times of observations.Finally,the method is applied in estimating a few sets of joint spacings of reservoir in the 6th member of Triassic Yanchang Formation at the southern 2nd region of Jingan oil field in the Ordos Platform.
OVERALL QUALTY MANAGEMENT SYSTEM BY MICROCOMPUTERS IN A LABORATORY
Ren Chun
1998, 20(3): 305-307. doi: 10.11781/sysydz199803305
Abstract(623) PDF-CN(285)
Abstract:
The participation of computers in the overall quality management of a laboratory has great use value to the enhancement of management efficiency,the relief of management intensity and the guarantee of analytical quality reliability.By the refinement of actual models,a microcomputer management system is set up which centers on projects and incorporates quality analysing and monitoring,closed document managing and perfect input and output managing as an integral whole.This system is both open and extensible in feature.

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