石油实验地质

1991, 13(4): 311-313. doi: 10.11781/sysydz199104311

Abstract(431) PDF-CN(234)

Abstract:

ON THE MECHANISM OF A NEW TYPE OF INTRACONTINENTAL SUBDUCTION——THE LONGMENSHAN SUBDUCTION

Liu Shugen, Luo Zhili, Cao Shuheng

1991, 13(4): 314-324. doi: 10.11781/sysydz199104314

Abstract(670) PDF-CN(412)

Abstract:
The Longmcnshan Thrust Belt is one of the typical thrust belts in China.Based on the detail studies of the lithosphere structures in the Longmenshan Region and the structural environment previous to the formation of the thrust belt,and combined with the geophysical and earthquake informations,the authors of this Paper suggested that the Longmenshan Thrust Belt developed under the mechanism of intracontinental subduction is resulted from the adjustment of deep-seated matter which made the lithosphere of the Sichuan Basin subducting to the Longmenshan and the western plateau of Sichuan.The thrusting movements took place along multiple plastic layers within the lithosphere (the upper part of the mantle,the lower,middle and upper crustal layers) during polystages (the latest of the Indosinian,the Yashanian,the Himalayan periods).The type of the subduction model is quite different both from B-subduction and A-subduction,and it is named as the type of the Longmenshan Subduction,abbreviated to the L-subduction.On the basis of the studies mentioned above,the geological conditions of oil/gas are elucidated in the paper for the Longmenshan Region.

GEOCHEMICAL IDENTIFICATION OF THE DEVONIAN FORELAND BASIN IN THE EASTERN QINLING, THE SOUTHERN SHAANXI

Gao Changlin, Ji Rangshou, Qin Deyu, Yin Yong

1991, 13(4): 325-339. doi: 10.11781/sysydz199104325

Abstract(700) PDF-CN(260)

Abstract:
The Devonian System of the eastern Qinling,the Southern Shaanxi is distributed in front of the eastern Qinling Suture and developed on the ancient passive margin of the eastern Qinling.This Devonian System can be divided into three belts of north,central and south belts respectively bounded by the Zhengan-Banyanzheng and the Shanyang-Zhashui faults.According to the geochemical and geological studies,it concludes that the Devonian system of the eastern Qinling had developed under the tectonic settings of peripheral foreland basin and the foreland basin can be characterized by the followings:1.The migration of the depocenter of the foreland basin,the depocenter was located ar the flank of the Yangtze Craton during the early Devonian and thereafter,it migrated gradually to the Danfeng-Shangnan obducting slab.2.The contact relationship between the Devonian sequences and the underlying sequence transformed successively from conformity,pseudoc-onformity to unconformity from the Yangtze Craton to the Danfeng-Shangnan obducting slab.3.The sedimentary facies of the system can be classified into lagoon and shore facies for the south Devonian belt,neritic shelf facies for the central belt and neriticfacies for the north belt respectively.4.The detrital sediments of the north belt derived from the ancient suture belt of the Qinling and the northward high land,and those of the central and south belts from the north passive continental margin of the Yangtze Craton.

A STUDY ON SECONDARY MIGRATION OF PETROLEUM IN JURASSIC SYSTEM OF THE SHAAN-GAN-NING BASIN ON THE BASIS OF CRUDE OIL PROPERTIES AND FRACTURING GRADIENTS IN RESERVOIR

Liu Xiaohan

1991, 13(4): 340-354. doi: 10.11781/sysydz199104340

Abstract(692) PDF-CN(210)

Abstract:
The ratio curves of methane content to oil/gas can be used to distinguish the two different patterns of migration.The curve together with other available data may provide certain important evidences for the vertical migration in Mesozoic systems;while the direction and distance of lateral petroleum migration in the Jurassic oil pools is preliminarily determined from the rhombic pattern and Kasimov migrating coefficient.Furthermore,the determination of fracture types,the distinguishing of migrating patterns,and the prediction of oil (gas) pools are made on the basis of the data from fractured gradients and cores.Consequently,the results and understanding from the analysis of above-mentioned methods are helpful to study the formation and distribution of oil/gas fields with the paleogeomorphology;therefore,to guide the petroleum exploration in the Jurassic system.

IDENTIFYING CRITERIA OF NATURAL GASES IN THE JIYANG DEPRESSION

Zhang Linye

1991, 13(4): 355-369. doi: 10.11781/sysydz199104355

Abstract(478) PDF-CN(267)

Abstract:
Based on the conprehensive utilization of the data of carbon and hydrogen isotopes,the compositions of light hydrocarbons (C₁-C₇),and the other organic geochemical analyses,the author studied the genesis and maturity of natural gas in the Jiyang Depression.In order to determine different types of gensis and the levels of maturation in the depression,some identifying criteria of the natural gases have been proposed in this paper.Only the gas from biodegration is a specific type of the natural gas in the Jiyang Depression,and the secondary gases derived from biodegradation can be distinguished from various primary gases with these criteria.Meanwhile,the gas source rocks of shallow,middle and deep strata in the depression can be basically determined on the basis of direct correlation on degasing analysis and indirect correlation on hydrocarbon evolutionary equations.

A NEW APPROACH FOR RESOURCE ASSESSMENT OF OIL AND GAS IN FRACTURED RESERVOIR

Liang Dingshan, Liu Min

1991, 13(4): 370-379. doi: 10.11781/sysydz199104370

Abstract(643) PDF-CN(184)

Abstract:
The authors of this Paper set up a modelling system for resource assessment of oil and gas for fracture-typed reservoir,fousing on the specialities of such a type of oil-gas pool formation.In a view of fracture system controlled occurrence of oil-gas pools,the authors predicted the number of pools in an exploratory play as well as the oil and gas reserves in each pool,based on the distributions of reserves calculated by pressure falling and the number of oil/gas pools,using ordered statistic and matched methods.Additionally,with what mentioned above,the total resources are evaluated;consequently,in an exploratory play,the potentials depending upon the amount of oil and gas in undiscovered pools are predicted.

APPLICATION OF COMPUTER MODELS ON THE RECONSTRUCTION OF GEOTHERMAL HISTORY IN BASINS

Zheng Chaoyang, Luo Qiuxia, Guo Dixiao

1991, 13(4): 380-389. doi: 10.11781/sysydz199104380

Abstract(636) PDF-CN(291)

Abstract:
The reconstruction of geothermal history in sedimentary basins is one of the fundamental studies for the oil/gas exploration.Since the amount of hydrocarbons generated from source rocks shows its functional relationship to the maturity and the changes of geothermal field would influence on the behavior of oil/gas in basins,the accurate reconstruction of changing process of geothermal field in basins would be favourable for the improvement of efficiency in oil/gas exploration activities.Therefore,the authors of this paper have developed a set of models to estimate the geothermal behaviors in various geological periods by using the available data from drill wells.Thereafter,it clearly reveals the thermal evolution of organic matter and reconstructs the geothermal history of basins based on the available geothermal profiles.

APPLICATION OF HELIUM GAS MEASUREMENT IN CHEMICAL PROSPECTING OF OIL AND GAS

Li Heqing

1991, 13(4): 390-398. doi: 10.11781/sysydz199104390

Abstract(623) PDF-CN(266)

Abstract:
Highly concentrated helium gas is contained in most of hydrocarbon pools,which is easier to migrate to the surface through the cap-rock,because of the mass and property of helium atoms.Anomalous areas are formed in the soil above hydrocarbon pools.The author has collected and tested samples from the nettings of known and unknown pools,and achieved obvious chemical prospecting results.

PRINCIPAL RESEARCH METHODS ON MINERAL FLUID INCLUSION OF CARBONATE ROCK AND THEIR APPLICATION

Liu Xin, Yang Chuanzhong

1991, 13(4): 399-407. doi: 10.11781/sysydz199104399

Abstract(569) PDF-CN(502)

Abstract:
The paper systematically introduces the major occurrence of mineral fluid inclusions in carbonate rock and several common research methods closely related to oil and gas exploration in carbonate rock areas.Furthermore,with the combination of the data of mineral fluid inclusion obtained from some carbonate rocks in Yunnan,Guizhou and Guangxi provinces,the applications of fluid inclusions of carbonate rocks in five aspects of petroleum exploration are approached in this paper.

A PRECISE PROCEDURE OF THE PROPORTION OF SMECTITE LAYER CALCULATION SUITABLE FOR INTERSTRATIFIED ILLITE/SMECTITES ANALYSIS OF NATURAL CLAY SAMPLES

Chen Hongqi, Zhao Xingyuan, Zhang youyu

1991, 13(4): 408-418. doi: 10.11781/sysydz199104408

Abstract(903) PDF-CN(349)

Abstract:
The 17Åreflection of the XRD pattern of oriented preparation ethy-lene glycol-solvated sample is an effective indicator to distinguish the disorderly from orderly (IS-ordered and ISII-ordered) illite/smectite interstrata.The experiments in this paper shows that the 17Åreflection intensity of disorderly interstratified illite/smectite varied mainly with the proportion of smectite layers (S%) for the pure sample rather than with the proportion of smectite layers (S%),but also with the disorderly interstratified illite/smectite content (I/S(%)) and other types of mineral contents,especially the content of discrete illite (I(%)) for the mixtures.From the XRD data of mixture samples composed of disorderly interstratified illite/smectite with two different proportions of smectite layers (S%) and different contents of discrete illites (I/S(%)),a precise procedure on the proportion of smectite layers (S%) calculation suitable for disorderly interstratified illite/smectite analysis of natural clay samples has been deduced.In the paper,a precise procedure on the proportion of smectite layer calculation suitable for orderly interstratified illite/smectite analysis of natural clay samples also has been deduced based on the data of Srodons publication (1984) and author's practical XRD analyses.

TECHNIQUE OF UNCOATED ROCK SAMPLES FOR SCANNING ELECTRONIC MICROSCOPE AND ITS APPLICATION IN STUDY OF OIL BED IMPROVEMENT

Jiang Kaixia, Pan Xiaoming

1991, 13(4): 419-426. doi: 10.11781/sysydz199104419

Abstract(655) PDF-CN(235)

Abstract:
In the paper,technique of uncoated rock samples and its operations for the SEM measurement are discussed.By this technique,a new understanding is obtained from studies on secondary reworks of oil beds and acidization mechanism,from which the most sensitive mineral for acidization is feldspar rather than clay.

THE OPINION ON THE CHANGXING FORMATION OF THE SHAZHOU REGION IN JIANGSU PROVINCE

Bao Dexian, Cao Haihong

1991, 13(4): 427-434. doi: 10.11781/sysydz199104427

Abstract(713) PDF-CN(225)

Abstract:
The Changxing Formation of the Upper Permian in the Shazhou Region is covered by Quaternary sediments.A plenty of fossils have been discovered in the Sha No.l well.In this paper,the Changxing Formation of this region has been correlated with that of the Meishan Section in the Changxing County,Zheiang Province by using the Simpson indices and the similarity of coefficients of conodonts.Therefore,it is suggested that the biofacies of this region should be marine shallow water and the lith-ofacies belongs to a wide carbonate platform according to the lithological characters.

1991 Vol. 13, No. 4

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