石油实验地质

PETROLEUM GEOLOGIC CONDITIONS OF MANJIAER DEPRESSION OF THE TARIM BASIN, AND EXPLORATION COUNTERMEASURES——DISCUSSED FROM WELL MAN NO. 1 BEING NOT MET WITH OIL

He Faqi, Li Gengyuan, Yang Shusheng

1996, 18(2): 127-133. doi: 10.11781/sysydz199602127

Abstract(542) PDF-CN(300)

Abstract:
The paper analyses about the characteristics of source rocks and trapping conditions in well Man No.1, and discusses further about petroleum geologic conditions of the Manjiaer depression relating to oil/gas migration and traps. Lastly, it suggests the countermeasures adoptable for exploration.

SEQUENCE STRATIGRAPHIC FRAMEWORK OF THE TARIM BASIN, XINJIANG

Li Xingping, Xu Guoming, Li Jinglian, Peng Yanwei, Gong Yunkun

1996, 18(2): 134-145. doi: 10.11781/sysydz199602134

Abstract(589) PDF-CN(442)

Abstract:
The authors established a sequence framework of the Tarim Basin by applying the method of sequence stratigraphy.From the Sinian to the Neogene,essentially the development of the basin can be divided into two major cycles and four stages,respectively result in different types of oil/gas source rocks,and form into various types of reservoir-cap combinations,reservoir bodies and traps.

POTENTIAL OIL/GAS PROVINCES IN THE TARIM BASIN──TECTONIC WEDGES

Fan Xiaolin

1996, 18(2): 146-154. doi: 10.11781/sysydz199602146

Abstract(511) PDF-CN(342)

Abstract:
In the interior of the Tarim Basin, due to the influences of orogeneses (deformation)in different geologic ages,tectonic wedges occurred in the anticline zones, on one or both sides of a normal unit (tectonic fold-uplift) adjacent to the areas of hydrocarbon source rocks.These wedges will become the places for the migration,accumulation,trap and pool of oil and gas.It is expected that they will be nowdomains in the Tarim Basin where future oil/gas survey and exploration,moreover the realisation of a break-through can be based,when there are favourable reservoir,sealing and capping conditions.

RESOURCES ASSESSMENT OF NATURAL GAS IN FORMATIONS (P-T₂) OF NORTHEAST SICHUAN REGION, THE SICHUAN BASIN

Long Shengxiang, Zeng Tao

1996, 18(2): 155-161. doi: 10.11781/sysydz199602155

Abstract(550) PDF-CN(311)

Abstract:
The northeast Sichuan region is one of major exploration targets. P-T₂ are superior in the geologic conditions of pool formation, which vertically form into three gas-bearing combination, i. e. P₁,P₂ and T_1-2. The estimation of gas-bearing property and prediction of resources extent were made with the basis of expert systems and exploratory stratigraphy method (GOGS) of natural gas, which arrived at a conclusion that the area has a large quantity of gas resources and a promising exploration prospect. The authors proposed that Daxian-Xuanhan-Kaijiang, Jiu Longshan-Kaijiang and Wangcang are favourable areas for gas exploration.

PRELIMINARY APPROACH TO COMPOSITIONAL HETEROGENEITY AND ACCUMULATION HISTORY OF RESERVOIR

Zhu Yangming, Zhang Min, Xu Zhongyi

1996, 18(2): 162-167. doi: 10.11781/sysydz199602162

Abstract(589) PDF-CN(405)

Abstract:
Applying the techniques of pyrolysis and thermal extraction, the variations of oil content and composition in the Triassic reservoir of Lunnan oilfield, the Tarim Basin. are studied in this paper. It has been found that the intervals with low porosity and permeability have a low content of oil, and less matured, and its distribution of n-alkane is predo minated by a front peak; while the intervals with high porosity and permeability contain more and matured oil with a predominance of higher carbon number n-alkanes; the petroliferousness and composition of oil from intervals with middle porosity and permeability range from the two above. The oil compositional heterogeneities of intervals with different porosities and permeabilities within a reservoir may reflect its accumulative history.

BASIC CHARACTERISTICS OF THE EARLY CARBONIFEROUS DEPOSITIONAL SYSTEM TRACT IN THE NORTH OF THE TARIM BASIN

Ma Lixiang, Wan Jingping, Wang Shifeng, Wang Genchang, Qu Xiaoguang

1996, 18(2): 168-173. doi: 10.11781/sysydz199602168

Abstract(530) PDF-CN(347)

Abstract:
Based on the principles of sequence stratigraphy,the paper described the basic characteristics of depositional system tract in the Lower Carboniferous.Field data showed that the system is a secondary cyclic sequence interbedded between 2 tectonic unconformities of the Early and Late Variscan periods.A transgressive system domain and a highstand system domain were developed within the sequence,with the sediments of lowstand system domain being absent. Favourable areas for oil/gas accumulation are barrier bar facies zones developed in the transgressive system domain and tidal channels developed in the highstand system domain.

GEOCHEMICAL CHARACTERS OF THE NATURAL GAS IN WEST LAKE DEPRESSION, THE EAST CHINA

Ye Jun, Guo Dixiao

1996, 18(2): 174-181. doi: 10.11781/sysydz199602174

Abstract(646) PDF-CN(406)

Abstract:
Hydrocarbon fingermarks, chemical compositions and isotope analyses of different components for the natural gas in West Lake depression are applied to identify its physical and chemical characters,maturity and gas source rocks. Furthermore the directions along which natural gas in the depression had migrated and accumulated are determlined. The paper may give geochemical evidences based on which to understand natural gas prospects and plan an explorative allocation.

OCCURRENCE AND AFFECTIVE GEOLOGICAL FACTORS OF COALBED GAS OF THE CARBONIFEROUS-PERMIAN IN THE EASTERN MARGIN OF ORDOS

Zhang Shengli, Li Baofang

1996, 18(2): 182-189. doi: 10.11781/sysydz199602182

Abstract(730) PDF-CN(321)

Abstract:
Based on the contents of coalbed methane,the paper divided the eastern margin of Ordos into three regions: the northern region with low gas content, the middle region with high gas content and the southern region with middle gas content. Then, the major geological factors affecting the content of coalbed methane were discussed, including burial depth of coal seams, metamorphic degree, geological structures, coal thickness, roof and floor lithologies of coal seams and magma movement. Lastly, it is pointed out that the middle region with high gas content is a favourable target for exploration of coalbed methane.

HYDRODYNAMIC TRAP METHOD APPLIED TO THE EXPLORATION OF OIL/GAS POOLS

Wang Jianrong, Jiao Shouquan, Chen Jiaxuan

1996, 18(2): 190-194. doi: 10.11781/sysydz199602190

Abstract(727) PDF-CN(401)

Abstract:
In the areas that are characterized by intense tectonic activities and active hydrodynamic conditions, the distributive location of an oil/gas pool does not coincide with structural trap, and there is a displacement between them. In 1982, Dahlherg proposed an oil/pool exploration method of hydrodynamic trap, using the data of oil, gas and water available. The paper introduces its principles and application to Es³⁽⁵⁾ Formation in Liuzan oilfield, Nanbu depression, in which case it not only predicted the distributive location of oil pools, but gave reasonable explanation for the phenomenon of waterflushed layers.

FORMATION PRESSURE ESTIMATED BY INTERVAL TRANSIT TIME OF MUDSTONES

Zhou Lihong, Liu Guofang

1996, 18(2): 195-199. doi: 10.11781/sysydz199602195

Abstract(674) PDF-CN(1173)

Abstract:
One of important jobs in the designing of oilfield drilling is to predict the formation pressure. The paper describes in detail the fundamental principles based on which to estimate formation pressure by applying interval transit time. Meanwhile,the authors compiles technical softwares with the basis of the principles. It is considered that this method is characteristic of a high accuracy,easy operation and profounding significance in the development and application within the oilfield.

DETERMINATION OF THE GEOMETRY OF LISTRIC NORMAL FAULT AND ITS REPRESENTATION ON COMPUTER

Xu Xuhui, Jiang Xingge, Wei Wu, Zhang Yuchang

1996, 18(2): 200-205. doi: 10.11781/sysydz199602200

Abstract(600) PDF-CN(301)

Abstract:
Based on the principles of area conservation,a functional relationship of a fault and the morphology of its hanging wall in the section is proposed for extensional listric normal faults. It presumes that the beds in the hanging wall are deformed by simple shearing,while the foot wall on the whole remains unchanged. The shearing direction of the hanging wall is random,which plays an important role in the faults and stratigraphic morphology predicted. The method is programmed with FORTRAN 77 on 386 microcomputer. The extent pattern of listric normal faults could be output directly and rapidly,by inputting arbitrarily the initial fault displacements and simple shear angles.

RELATION OF ORGANIC ACID GENERATED BY KEROGEN TO SECONDARY POROSITY OF RESERVOIR

Zhu Baoquan, Cheng Zhongdi, Ying Fengxiang

1996, 18(2): 206-215. doi: 10.11781/sysydz199602206

Abstract(657) PDF-CN(456)

Abstract:
The significance of organic acids generated by kerogen on diagenesis and secondary porosity is discussed in the paper. It is considered that those secondary porosity genetically related with kerogen-derived organic acids are resulted from the reactions of organic acids yielded by and accumulated in kerogen to minerals in rocks; meanwhile it is suggested that the residual acids generated by kerogen in formation relative to their total yield (expressed by the product of per unit weight yield of residual acids by kerogen, the content of organic acids and thickness of formation), the ratio of Σ binary-acid and Σ mono-acid can be employed to predict the intervals with well-developed secondary porosity.

LABORATORY TESTS FOR THE DAMAGE OF OIL-BASD MUD TO CORE

Ma Yonghai

1996, 18(2): 216-220. doi: 10.11781/sysydz199602216

Abstract(809) PDF-CN(356)

Abstract:
Simulation tests for oil-based mud contamination of the cores sampled from an oilfield of South China are carried out in laboratory, which proved that oil-based mud not only changed the wettability of cores into a strong lipophilicity, but also caused the rock pores being blocked by the solid grains in oil-based mud, as a result,there is a great reduction in effective and absolute permeabilities of oil phase. Once cores are damaged by oil-based mud, it is difficult to restore the permeability of cores to its original level by applying the conventional technique of water injecting and washing.

¹³C NMR DEPT METHOD APPLIED TO THE STUDY OF COMPOSITIONAL CHARACTERISTICS OF CRUDE OIL

Li Zhenguang

1996, 18(2): 221-227. doi: 10.11781/sysydz199602221

Abstract(541) PDF-CN(289)

Abstract:
With the basis of measurements on condensates, light oils and ordinary crude oils from Sichuan, Xinjiang and Daqing etc., using the method of ¹³C NMR DEPT (Distortionless Enhancement by Polarization Tranfer), the compositional data of their relative contents and average chain length of CH, CH₂ and CH₃ are determined, in order to approach their compositional characteristics.

1996 Vol. 18, No. 2

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