石油实验地质

OCCURRING OF THE EAST CHINA YANSHANIAN PLATEAU AND ITS INSPIRATION TO MINERAL AND PETROLEUM RESOURCES EVALUATION

WU Gen-yao, CHEN Huan-jiang, MA Li, XU Ke-ding

2002, 24(1): 3-12. doi: 10.11781/sysydz200201003

Abstract(721) PDF-CN(450)

Abstract:
It is first represented that the Su-Wan(Jiangsu-Anhui)Block is an independent tectonic unit in the period of Tethyan evolution.Based on the research fruits of igneous rocks,metamorphic rocks and paleogeomagnetism,it is thought that the Su-Lu(Jiangsu-Shandong)Ocean closed in the Late Jurassic-Early Cretaceous at last,the collision of the Su-Wan Block with the North China Craton resulted in the appearance of the plateau,and the East China Yanshanian Plateau should belong to collision plateaus in its features.In this paper,the thrust-nappe zone on the margin of the plateau and its internal complex structure,including relative high and steep spaces developing along major collision-shear zones and relative open intermountain molasse basins,are also discussed.It is considered that the plateau is a part of the grand scale East Asia Yanshanian Orogenic Series with relative weak deformation and metamorphism.The plateau had collapsed since the end of the Early Cretaceous.The Late Cretaceous was the overall collapsing period of the East Asia Yanshanian Orogenic Series.In the Tertiary,the Yanshanian plateau did not exist at all.Strong magmatic activities made Yanshanian mineralization possess obvious regional specialization not only in Su-Wan area but also in Jiaodong,Xiaoqinling and Northeast Jiangxi areas.The Late Mesozoic-Cenozoic tectonic events resulted in the low strength lithosphere and high geothermal gradient in Su-Wan to the Huanghai Sea area.On this basis,the petroleum prospects are evaluated.

BASIN EXTENSIONAL AMOUNT OF THE JIYANG DEPRESSION AND ITS PETROLEUM GEOLOGICAL SIGNIFICANCE

XIAO Huan-qin, CHEN Guang-jun, LI Chang-bao

2002, 24(1): 13-18. doi: 10.11781/sysydz200201013

Abstract(871) PDF-CN(566)

Abstract:
An approximately quantitative method was used at first time to analyse the basin extensional amount of the Jiyang Depression. Furthermore,the tectonic subsidence and evolutionary history of the basin were discussed. By studying on the effects of basin extensional amount on sedimentary systems,depositional cycles and oil posibility,its geological significance to hydrocarbon exploration was suggested.

THE YITONG GRABEN-THE STRUCTURAL FEATURES AND EVOLUTION OF A STRIKE-SLIP FAULT BASIN

LI Xian-fu, CHEN Quan-mao, ZHANG Xue-hai, ZHANG Chun-hua, ZHANG Fu-sheng, ZHANG Zhen-wei

2002, 24(1): 19-24. doi: 10.11781/sysydz200201019

Abstract(872) PDF-CN(610)

Abstract:
The Yitong Graben is a Tertiary petroliferous strike-slip fault basin developed on the Hercynian fold basement.It has long and narrow asymmetric graben structure.Its fault structure is complex,developing normal-slip faults and reverse-slip faults.The compound superimposed structure formed by the joint action of tenso-shearing and compresso-shearing is its main structural pattern.The formation and evolution of the graben includes initial fault depression,main fault depression and renew action three stages. During the formation of the graben,the inhomogeneous distribution of stress due to the restriction of boundary faults resulted in differential subsidence between east and west and uplift and sag interval change from south to north within the graben,the depocenter and the subsidence center migrating with different faulting stages.

STRUCTURAL DEFORMATION OF THE TRIASSIC FORELAND BASIN AND PETROLEUM EXPLORATION IN THE MIDDLE PART OF THE WESTERN SICHUAN BASIN

FAN Xiao-lin, ZHU Tong, PAN Wen-lei, LOU Xiao-quan

2002, 24(1): 25-30. doi: 10.11781/sysydz200201025

Abstract(827) PDF-CN(537)

Abstract:
Geological survey and geophysical interpretation revealed that the Late Triassic foreland basin in western Sichuan was involved in intraplate deformation as a result of squeezing activity in Longmenshan area.Due to its richness in hydrocarbon in the Late Triassic,the deformation age,characteristics and mechanism of the Late Triassic foreland basin were analyzed in detail,and the relationship between structural deformation and hydrocarbon accumulation was especially high lighted.In accordance with analysis three different gas-bearing structures developed in the foreland basin,the principal facters for hydrocarbon accumulation was discussed,and the favorable targets for gas exploration were proposed.

TRAPPING CHARACTERISTICS AND ACCUMULATION RULES OF HYDROCARBON IN THE SHAYA UPLIFT OF THE TARIM BASIN

CHEN Rong-lin, MA Hong-qiang, JIA Cun-shan

2002, 24(1): 31-35. doi: 10.11781/sysydz200201031

Abstract(649) PDF-CN(473)

Abstract:
The Shaya Uplift in the Tarim Basin is an important tectonic zone for hydrocarbon reservoir development. Based on the reinterpretation of seismic profiles and compilation maps which have already been obtained in the strdy area,the hydrocarbon traps in this area can be classified into three types and ten subtypes. These traps of different stages and different types usually superimpose and intersect longitudinally,and exist in rows and in belts planarly. Starting with the major factors controlling hydrocarbon accumulation and its assemblages,the hydrocarbon accumulation characteristics are discussed in this paper. This has certain directive significance to further hydrocarbon exploration in this area.

APPLICATION OF DEPOSITIONAL BASE-LEVEL CONCEPT IN SEQUENCE STRATIGRAPHIC DIVISION, CORRELATION AND LITHO-STRATIGRAPHIC TRAPS PREDICTION

CAO Ying-hui, CHI Ying-liu, XUE Liang-qing, WANG Hong-jiang

2002, 24(1): 36-40. doi: 10.11781/sysydz200201036

Abstract(629) PDF-CN(471)

Abstract:
Depositional base-level cycle controls the development and evolution of sequence stratigraphy.Different from that in sea basin,the depositional base-level in continental basin is not sea-level or lake-level but river depositional equilibrium profile.During depositional base-level cycles,the sediment volume into different facies varies correspondence with its accommodation and that leads to the variation of sediment stacking patterns and symmetries of stratigraphic cycles.This provides scientific basis for sequence division and correlation.Correct chronostratigraphic correlation should be that of rocks to rocks,rocks to surfaces or surfaces to surfaces according to sediment volumetric partition.During depositional base-level cycles,the variation of accommodation controls the development of source rock,reservoir rock and cap rock in different system tracts and the forming of unconformity and various litho-pinch out. This is the basis of strata-lithologic traps prediction.In this paper,taking Songliao basin as an example,five principal types strata-lithologic traps and their particular formation conditions and distribution were analysed in the basin.

ANALYSIS ON THE SEDIMENTARY ENVIRONMENT OF THE CARBONIFEROUS CARBONATE AND DETRITAL ROCK ALTERNATING SEDIMENTATION IN THE MAIGAITI SLOPE OF THE TARIM BASIN

JIANG Ling-zhi, GU Jia-yu

2002, 24(1): 41-47. doi: 10.11781/sysydz200201041

Abstract(650) PDF-CN(423)

Abstract:
By study on the petrology,sedimentary,logging curve and seismic characteristics of the Carboniferous in the Maigaiti Slope of the Tarim Basin,the Carboniferous of the area was divided into eight lithologic members including three carbonate rock ones and five detrital rock ones,that is,the Donghe Sandstone Member(C₈),the Lower Mudstone Member(C₇),the Bioclast Limestone Member(C₆),the Middle Mudstone Member(C₅),the Standard Limestone Member(C₄),the Upper Mudstone Member(C₃),the Sand-Mudstone Member(C₂)and the Xiahaizi Limestone Member(C₁)from bottom to top.By in-situ core observation and indoor thin-section identification as well as stable isotope and trace clement testing,the sedimentary environment of each lithologic member was analysed,and the vertical distribution of sedimentary facies was obtained.Compared with study taking formations as units before,it is more precise and can direct petroleum exploration correctly. In view of the mixed sedimentation genesis of the Carboniferous by carbonate and detrital rocks in the area,this paper made a discussion on it.

ABNORMAL PRESSURE BELTS AND HYDROCARBON ACCUMULATION MODELS IN THE LISHUI SAG,THE DONGHAI BASIN

JIANG Liang, JIN Qiang, GE He-ping, WANG Wei-feng

2002, 24(1): 48-51. doi: 10.11781/sysydz200201048

Abstract(676) PDF-CN(468)

Abstract:
It is proved by well data that abnormal high-pressure exists widely in the Paleogene Mingyuefeng Formation of the Lishui Sag,the Donghai Basin.In this paper,the geologic,drilling,logging and testing data are synthesized,the types,genetic mechanism and characteristics of abnormal high-pressure in the Lishui Sag are studied,and the control action of abnormal high-pressure to hydrocarbon migration and accumulation,pool-forming mechanism and hydrocarbon distribution rules is analysed.At last,three models of hydrocarbon accumulation under abnormal high-pressure are summarized,that is,the sandstone accumulation model above abnormal high-pressure sealing layers,the accumulation model within overpressure layers and the accumulation model under sealing layers.These models have important directive significance to hydrocarbon exploration and development.

CHARACTERISTICS OF THE ABNORMAL PRESSURE SYSTEM IN THE LISHUI SAG OF THE DONGHAI BASIN

HUANG Zhi-long, JIANG Liang

2002, 24(1): 52-56. doi: 10.11781/sysydz200201052

Abstract(647) PDF-CN(480)

Abstract:
The Tertiary rapid-deposited strata were developed in the Lishui Sag.Very obvious abnormal pressure is an important feature of them. By using geologic,drilling,logging and testing information in this paper,the types,genetic mechanism and distribution of abnormal pressure are studied based on the analysis of abnormal pressure in main test wellls. The study reveals that the abnormal pressure in the Lishui Sag belongs to the top-sealed expulsion-retarded abnormal pressure system,the pressure gradient of overpressure belts is obviously different,and the overpressure belts can be divided into the sealing layer overpressure belt,the pressure transitional belt and the ultrahigh pressure belt three abnormal pressure belts longitudinally.

ORIGIN OF FORMATION WATER IN TAHE oil field AND ADJACENTS

CAI Li-guo, QIAN Yi-xiong, LIU Guang-xiang, HAN Yan-ying, ZHANG Pen-de

2002, 24(1): 57-60. doi: 10.11781/sysydz200201057

Abstract(614) PDF-CN(487)

Abstract:
The formation water contains much higher concentration of solids and total solid concentration ranges from 100g/L to more than 300g/L in the Ordovician,Carboniferous and Triassic reservoirs at Tahe oil field and adjacents,which was considered as forming in a closed hydrogeological environment and disconnected with each other. The new concludes are made by the analysis of the formation water:a)the chemical profiles of formation water are inversion in the Ordovician,Carboniferous and Triassic reservoirs,the higher total solids concentration is formed by solution of salts in the sediment rocks of the area;b)the δD and δ¹⁸O are lighter and maybe composed of surface water and formation water;c)the formation of oil field water is the result of surface water leaching the NaCl containing in the sediments of the area. All these indicate that the hydrogeological environment is not colsed,but opening in the area. The influence of the opening environment in the migration and accumulation of oil and gas must be taken into consideration in the exploration of Tahe oil field and adjacents.

CHEMICAL FIELDS, HYDRODYNAMICAL FIELDS AND GAS ENRICHMENT IN THE LATE TRIASSIC OF WESTERN SICHUAN BASIN

WU Shi-xiang, WANG Ze-cheng, ZHANG Lin, WANG Yun-pu, LIN Jin-xuan

2002, 24(1): 61-68. doi: 10.11781/sysydz200201061

Abstract(596) PDF-CN(354)

Abstract:
The ingredient and movement features of the groundwater are important for the enrichment of oil and gas in gas bearing basins.The features of the groundwater in the second and forth menbers of the Xujiahe Formation in the Late Triassic of the Western Sichuan Basin was discussed.By integrating chemical fields and dynamical fields of the groundwater and the around geochemical environment,the concept of geochemical dynamical belt of groundwater was proposed,and three belts,i.e.,hydro-pressure forming belt,backwater belt and discharge belt,were indicated in the members of the formation.In the discharge belt and backwater belt,the solute is in the state of transplanting and congregating with deoxidizing environment,and the known gas fields are mainly distributed in the belts.Nevertheless,in the hydro-pressure forming belt,solute diverse and become pure,and most of the gas bearing traps are distrbuted in the belt.Based on above characteristics,the promising exploration belts in the Western Sichuan Basin was pointed out.

PROPERTIES AND GEOLOGICAL MEANINGS OF RESERVOIR ROCK-EVAL PYROLYSIS PARAMETERS OF ZAO-Ⅴ OIL SUB-FORMATION IN SHENJIAPU oil field

YIN Wei, LIN Ren-zi, LUO Xiao-ping, LIN Shuang-yun

2002, 24(1): 69-72. doi: 10.11781/sysydz200201069

Abstract(636) PDF-CN(496)

Abstract:
The geochemical implications and geological meanings of reservoir Rock-Eval pyrolysis parameters were discussed in details in the paper,and combined with the properties of reservoir Rock-Eval pyrolysis parameters in Zao-Ⅴ oil sub-formation in Shenjiapu oil field,the crude oil properties and vertical oil saturation of reser-voirs were analyzed,the main oil layers were pointed out,the effectiveness of the perforations were checked,and sand layers requested for being perforated were put forward in order to raise the production.The results showed that the crude oil had high density and viscosity,and reservoir oil saturation became worse vertically,i.e.,from oil alyers to oil-water layers till pure water layers with increase of depth.

NUMERICAL SIMULATION OF MIOCENE EPOCH TECTONIC STRESS FIELD AND PREDICTION OF FAVORABLE PLACE FOR PETROLEUM ACCUMULATION IN THE XIHU DEPRESSION, DONGHAI

LIU Cui-rong

2002, 24(1): 73-76. doi: 10.11781/sysydz200201073

Abstract(1669) PDF-CN(553)

Abstract:
According to predecessors geological research results and actual data,using geomechanics opinion,combined with its structrual deformation character,the boundary condition and stress acting behaviors of the Xihu depression were analyzed in the Miocene epoch.Its geological model was described by paleostructure map and rock mechanics parameters,and the tectonic stress field in the Miocene was modelled by elastic mechanics model and finite-element method for plane stress.The favorable positions for hydrocarbon accumulation were predicted in accordance with the modelling results.

MODELING EXPERIMENT OF THE AMOUNT OF RELEASED WATER-SOLUBLE GAS CONTROLLED BY TEMPERATURE AND PRESSURE

ZHANG Yun-feng

2002, 24(1): 77-79. doi: 10.11781/sysydz200201077

Abstract(577) PDF-CN(455)

Abstract:
Based on analysis of various factors affecting solubility of natural gas in formation water,the necessary geological conditions for releasing water soluble gas was studied.By experiment of physical modeling,it was observed that the amount of free gas from water soluble part was mainly controlled by temperature and pressure during its migration and a regress equation for describing free gas changes was proposed.The equation provided a solution in estimating the contribution of water soluble gas to a natural gas reservors.

MICRO-FLUORESCENCE ANALYSIS OF MICROTRACE AND ORGANIC INCLUSIONS AND ITS APPLICATION TO EXPLORATION IN CENTRAL DAGANG oil field

ZOU Hai-feng, XU Xue-chun, GAO Fu-hong, LIU Li

2002, 24(1): 80-84. doi: 10.11781/sysydz200201080

Abstract(674) PDF-CN(535)

Abstract:
A brief introduction to fluoresence mechanism of liquid hydrocarbon and its application in petroleum geology were illustrated in this paper. Based on the micro-fluorescence analysis of microtrace formed by migration of oil and gas within the particles of rocks and minerals and the organic inclusions in Ganggu wells and Kou wells in Dagang exploration area,the periods of oil-gas generation,migration,accumulation and evolution were inferred,and the petroluem potential was evaluated.The wide application prospect of micro-fluorcesence in the exploration of oil-gas resources was also indicated.

A NEW TECHNIQUE TO MAKE FULL USE OF VETERAN OIL WELLS

FAN Yu-xiu, LÜ Bing-quan, LAN Yan, CHEN Xian-shen, ZHANG Yan-jun

2002, 24(1): 85-89. doi: 10.11781/sysydz200201085

Abstract(779) PDF-CN(426)

Abstract:
In terms of Rtseek Inversion Program of American Precision Measurement Corporation,this paper adopted combined inversion method for apparent resistivity logging curves under different electrodes.Theoretical models and actual data process indicated that this technique can determine the characteristics of fluid in strata,attaining the purpose of making full use of veteran oil wells.

FIELD TEST OF TERTIARY RECOVERY USING WPS IN CHUJIALOU oil field, JIANGSU PROVINCE

WANG Jin-yu, WU Jian-qiang, LU Ru-hua, WU Zhi-liang, Cheng Han-dong, DUAN Bao-lin

2002, 24(1): 90-96. doi: 10.11781/sysydz200201090

Abstract(1109) PDF-CN(410)

Abstract:
WPS is a new-typed water-soluble anion surfactant,and can be used as an oil-displacement agent for tertiary recovery.Under the cooperation between East China Bureau of Petroleum and Anqing Petroleum and Chemical Factory,a WPS tertiary recovery field test project was developed in Chujialou oil field.During the project,WPS oil-displacement agent was injected by 50.3t cumulatively,the injection concentration was 0.5%,and the total injected fluid amount was 10057.70m³.By field monitoring and comparaive analysis,the expected results of decreasing water content,increasing oil daily production and poor oil properties were obtained in the two observation wells,and the cumulative increased oil production was 506.79t. The field test approached to the new path of tertiary recovery,which had more obvious economic benefits and fulfilled and the test targets of oil increasing,water control and reservoir recovery raising.

2002 Vol. 24, No. 1

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