石油实验地质

1991, 13(3): 201-209. doi: 10.11781/sysydz199103201

Abstract(527) PDF-CN(379)

Abstract:

ON PRINCIPAL FACTORS FOR THE FORMATION OF NATURAL GAS POOLS UNDER A SYNAMIC BALANCE REGIME

Zhang Yigang

1991, 13(3): 210-221. doi: 10.11781/sysydz199103210

Abstract(645) PDF-CN(385)

Abstract:
The author of this paper describes four principal factors for the formation of nautral gas pools under a dynamic balance regime based on the relationship between the generation, accumulation and dissipation of natural gas.The source rocks and the stage of gas generation peak are the most important factors in the formation of gas pool while sealing efficiency and tectonic settings are the important factors for the gas accumulation and dissipation. Therefore, it is concluded that four fundamental factros for the formation of natural gas pools are of abundant gas source, the late stage of gas generation peak, excellent sealing efficiency and stable teetenic settings.

A NEW UNDERSTANDING OF HYDROCARBON GENERATION MECHANISM OF CARBONATE ROCKS

Cao Huiti, Zhang Yigang, Xu Xiang, Lu Meizhi, Gao Guoping

1991, 13(3): 222-237. doi: 10.11781/sysydz199103222

Abstract(723) PDF-CN(371)

Abstract:
The mechanism of hydrocarbon generation in carbonate rocks are studied by step heating extraction and simulation. The authors found that (1) carbonate minerals have the influence of condensation and dehy-drogenation on kercgen,and can promote its degradation into liquid hydrocarbon under low temperature, thus increase the yield of gaseous hydrocarbon, (2) Montmorillonite is capable of promoting the breakage of carbon chains and the transformation of liquid hydrocarbon into gaseous hydrocarbon under low temperature; (3) The existence of clay mineral in carbonate rocks affects the condensation and dehydrcgenation of carbonate minerals over kerogen, thus the hydrocarbon generating rate is reduced; (4) The peak of gas generation for carbonate source rocks is later than that for muddy source rocks. Furthermore,based on the measurements of residual gas generating rates in carbonate source roeks, and simulations on samples with low maturation from different sequences in various areas of China, the migrating rate for liquid hydrocarbon in carbonate rocks during gee-history is considerable higher than that in mudstone, and it can reach as much as 60% for pure limestone, but only 25% for marlites.

ON THE SOURCE OF NATURL GAS IN THE JURASSIC SYSTEM OF THE WEST SICHUAN DEPRESSION, THE SICHUAN BASIN

Guan Xiaoru

1991, 13(3): 238-246. doi: 10.11781/sysydz199103238

Abstract(544) PDF-CN(313)

Abstract:
Based on the conventional analysis of organic geochemistry, and debris gas, components of natural gas, fingerprints of light hydrocarbon, and carbon isotopesetc.,the gas source of the Jurassic natural gas in the west Sichuan Depression, the Sichuan Basin is studied and correlated in this paper. It is suggested that the gas in the depression was mainly derivd from the T₃x₄-T₃x₅ assemblages.

AN ASSESSMENT SIMULATION SYSTEM OF NATURAL GAS RESOURCES

Liu Min, Liang Dingshan

1991, 13(3): 247-256. doi: 10.11781/sysydz199103247

Abstract(602) PDF-CN(207)

Abstract:
Based on the characteristics of the formation and distribution of oil/gas pools in petroliferous basin,this paper proposed anassessment simulation system applicable for natural gas resources either attribated to porous or fissure types of gas pools. This new system is developed on the concept of super population and the probability of normal logarithmic dis tribution, taking plays as assessment units and local structures as prediction basis.

INFLUENCE OF RADIOACTIVE HEAT GENERATION WITHIN LITHOSPHERE ON GEOTHERMAL HISTORY OF EXTENSIONAL BASIN

Wang Liangshu, Li Cheng, Shi Yangsheng

1991, 13(3): 257-264. doi: 10.11781/sysydz199103257

Abstract(576) PDF-CN(312)

Abstract:
The restoration of geothermal history is one of important parts in basin modelling. However, in present analysis on geotherms of extensional basins by geophysical techniques, the influence of radioactive heat generation within the lithosphere is neglected in general. In this paper, therefore, a model of heat generation by radioactive elements of the lithosphere is developed and formulae for geothermal history and subsidence history are proposed. A fact is obvious that the geothermal history of extensional basins is much affected by the heat generation of radioactive elements, therefore, it can not be overlooked in the analysis of the geothermal evolution of extensional basins.

PETROLOGICAL CHANGE OF SANDSTONE DURING ACIDOLYSIS

Ma Qing, Jin Guochao

1991, 13(3): 265-271. doi: 10.11781/sysydz199103265

Abstract(603) PDF-CN(275)

Abstract:
The acidolysis simulations of sandstone are made to study the evolution and recognition of the secondary porosity of sandstone. The paper mainly discussed about various changes of mineral composition, porosity, permeability and pore texture during acidolysis of sandstone, as well as various dissolutions observed on the thin sections of acidolysis casts. Based on what mentioned above, the evolutional process and the conditions of secondary porosity in sandstone are described in this paper.

SIMULATION EXPERIMENTS OF KARSTIC WATER IN RENQIU OILFIELD

Han Baoping

1991, 13(3): 272-280. doi: 10.11781/sysydz199103272

Abstract(519) PDF-CN(335)

Abstract:
Based ont he geological condition and principle of chemical dynamics, the author simulated the karstification of thermal water in the oilfield, by using DF-05 Type autoclave. The author thinks that 1) there are several factors that control the corrosional degree of a rock: the chemical composition, chemical combination of oil field water, temperature, differential pressure of carbondioxide in the rock itself, and the agitating speed and reaction time etc; 2) in oil field environment, the dolomites subjected to strong corrosion of oil field water may form good hydrocarbon reservoirs.

CLUSTERING ANALYSIS ON BULK SAMPLES FOR THE RESERVOIR EVALUATION

Yang Deyong, Li Chao

1991, 13(3): 281-286. doi: 10.11781/sysydz199103281

Abstract(742) PDF-CN(255)

Abstract:
The procedures for conventional and bulk sample clustering analysis are introduced in this paper. Furthermore, the problems concerning lineage plotting, the reverse of gravity centre, selection of variables and result analysis are discussed in detail.

MICROSCOPIC CHARACTERISTICS ON THE SAPROFICATION OF KEROGEN IN SOURCE ROCKS AND THEIR SIGNIFICANCE IN THE CLASSIFICATION OF ORGANIC TYPES

Yin Mo, Zhu Youhua

1991, 13(3): 287-296. doi: 10.11781/sysydz199103287

Abstract(694) PDF-CN(342)

Abstract:
160 source rock samples taken from 48 wells in the Jiyang Depression are systematically studied using transmitted and reflected fluorescent lights. Amorphous solids discovered in kerogens may derive from three different types of precursors, i.e. lower planktonic astogenetic algae, cutinites of higher plants and herbaceous plants, which can have certain hydrocarbon potential and provide new evidences for the classification of kerogen types. This paper also focuses on the degradative evolution of lower planktonic algae into amorphous solids and suggests that microbial degradation prevails over algae during undermaturation, generating crude oil of low maturity; while matured oil generates during the maturation stage dominated by thermal degradation.

ON THE STAGE OF KARST-COLLAPSE BRECCIA IN THE JIALINGJIANG FORMATION OF THE LOWER TRIASSIC IN THE MIDDLE YANGTZE AREA

Cao Shuyun

1991, 13(3): 297-302. doi: 10.11781/sysydz199103297

Abstract(611) PDF-CN(387)

Abstract:
Based on the analysis of tee physical, chemical and biological characteristics of breccia, the author suggests that the karst-collapse breccia from the Jialingjiang Formation of the Lower Triassic in the Middle Yangtze Area was developed during the time of Indo-Sinian and Indo-early Yensh-anian, i.e before the time of migration and accumulation of oil and gas. Consequently, the karst-collapse breccia of the Jialingjiang Formation is a favourable reservoir which should not be overlooked.

DISCUSSION ON THE AGE OF THE SHANGSI FORMATION IN THE LIGUANQIAO BASIN

Qu Xingguo, Zhang Shijie, Xu Mingzhu

1991, 13(3): 303-309. doi: 10.11781/sysydz199103303

Abstract(613) PDF-CN(216)

Abstract:
There is a conformitive relation between the Shangsi and the Hctao formations. The Shangsi Formation is an overlying sequence with a certain thickness and distinct litho-characteristics, deposited during the basin shrinking rather than a product of lateral facies change within the Hetao Formation. According to priority, the term of the Shangsi Formation should be reserved. Since the fossils produced in the upper section of the Hetao Formation attributed to the age of late Eocene, the authors of this paper think it suitabe to define the age of the Shangsi Formation as Oligoeene.

1991 Vol. 13, No. 3

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