石油实验地质

1982, 4(2): 85-85. doi: 10.11781/sysydz198202085

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1982, 4(2): 86-87. doi: 10.11781/sysydz198202086

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1982, 4(2): 88-90. doi: 10.11781/sysydz198202088

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1982, 4(2): 90-92. doi: 10.11781/sysydz198202090

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1982, 4(2): 92-93. doi: 10.11781/sysydz198202092

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1982, 4(2): 93-96. doi: 10.11781/sysydz198202093

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1982, 4(2): 96-97. doi: 10.11781/sysydz198202096

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1982, 4(2): 97-99. doi: 10.11781/sysydz198202097

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1982, 4(2): 99-100. doi: 10.11781/sysydz198202099

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1982, 4(2): 101-103. doi: 10.11781/sysydz198202101

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1982, 4(2): 103-104. doi: 10.11781/sysydz198202103

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1982, 4(2): 104-106. doi: 10.11781/sysydz198202104

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1982, 4(2): 106-107. doi: 10.11781/sysydz198202106

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1982, 4(2): 107-109. doi: 10.11781/sysydz198202107

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1982, 4(2): 109-112. doi: 10.11781/sysydz198202109

Abstract(447) PDF-CN(237)

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FORUM ON THE PROSPECTS OF OIL AND GAS RECONNAISSANCE AND EXPLORATION IN CHINA IN COMBINATION WITH RESEARCH DEVELOPMENTS OF PETROLEUM GEOLOGY

editorial board

1982, 4(2): 113-113. doi: 10.11781/sysydz198202113

Abstract(590) PDF-CN(314)

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The editorial board of "EXPERIMENTAL PETROLEUM GEOLOGY" organized a discussion by writing on "The Prospects of Oil and GasReconnaissance and Exploration in China in Combination with Research Developments of Petroleum Geology".Each of the petroleum geolo-gists participating in this discussion expressed opinion of his ownabout the problems in the present-day searching for oil and gas in China.

THE CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT OF THE MIDDLE CARBONIFEROUS CARBONATES OF EASTERN SICHUAN

Lin Zhongqian, Zhong Guochu

1982, 4(2): 114-120. doi: 10.11781/sysydz198202114

Abstract(829) PDF-CN(318)

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The Middle Carboniferous series of Eastern Sichuan is composed of brecciated carbonate with moderate thickness. Its petrographic classification, sedimentary texture, biological fossils and diagenesis reveal that it is of tidal flat deposit formed under hot and semi-arid climate. The sedimentary environment which can be devided into six subtypes has been reconstructed and used to establish a sedimentation model for Middle Carboniferous series of Eastern Sichuan. The strata of the Middle Carboniferous of Eastern Sichuan can be divided into five members which make up a lower complete transgression-regression sequence and an upper incomplete transgression sequence. The sedimentation of these five members in different localities are analysed. Horizontal correlations between them are carried out. General aspects of the lithofacies change of different members are showed clearly on a diagram of lithofacies profile. In the case of the lacking biological fossils, individual beds are correlated according to facies cycles.

PRELIMINARY ANALYSIS OF THE FACTORS AFFECTING THE PHYSICAL PROPERTIES OF RESERVOIR IN SOUTHERN SONGLIAO BASIN

Liu Jun

1982, 4(2): 121-129. doi: 10.11781/sysydz198202121

Abstract(781) PDF-CN(281)

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A preliminary analysis of physical properties of the main oil pay (Fuyu oil pay) in southern Songliao Basin and the factors affecting them was carried out through the study of the thin-section and the regional sedimentary characteristics. It was found that in addition to the mineral constituents,the textures, and the secondary fractures of the rocks which affect the reservoir behaviour, the most important factor is: as burial depth of oil beds gets deeper, diagenesis of rocks gets stronger. As a result, primary porosity becomes lower, and reservoir behaviour becomes worse. Thus, diagenesis directly influences physical properties of the sandstone beds. For the sake of delineating areas of better reservoir properties, the variation trend of the Fuyu oil pay is investigated. Taking Qian An as a center, which is located in the central depression of the basin, the variation trend appears to be shaped as a horse-shoe. Within the horseshoe-like ring zone, the burial depth of the Fuyu oil pay is greater than 2000 m, the diagenesis of the reservoir rocks is rather strong, the porosity is lower than 10%, and the permeability is less than 1 mD. Off the horse-shoe-like ring zone, the physical properties of the rocks become better gradually. Thus, it is suggested that the area off the horse-shoe-like ring zone is a favourable zone for exploration.

THE HYDROCHEMICAL CHARACTERISTICS OF NON-MARINE OIL-FIELD WATER IN CHINA AND ITS EVOLUTION PATH

Liu Chongxi

1982, 4(2): 130-138. doi: 10.11781/sysydz198202130

Abstract(883) PDF-CN(299)

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Basing on a large number of analytical data, the hydrochemical characteristics of non-marine oil-field water in China and its evolution path are discussed. Along with the generation and development of sedimentary basin, the non-marine oil-field paleowater underwent a series of complicated processes of hydrogeochemical evolution, and eventually transformed into the present status. The hydrochemical composition changed along a main trend with increasing concentrations of anion Cl^- and cation Na⁺. The differences among hydrochemical types depend on the concentrations of secondary ions and the degree of mineralizationi meanwhile, the degree of mineralization and the hydrochemical type show distinct zonation from north to south, reflecting the influences of paleoclimatology and paleohydrochemistry. In addition, the formation, occurrence, and circulation of oil-field water, and the evolution of hydrochemistry accorded with the formation, migration and accumulation of oil and gas. All these were strictly controlled by the second-ordered tectonic elements-sedimentary depressions-within the petroliferous basins and thus appeared as a single complex during hydrochemical evolution. This is an important characteristic of non-marine oil-field water.

ROLE OF BORON IN STUDYING ANCIENT SEDIMENTARY ENVIRONMENT

Wu Bihao, Xu Xiaosong, Zhang Chunzeng, Zhang Qunying

1982, 4(2): 139-148. doi: 10.11781/sysydz198202139

Abstract(548) PDF-CN(307)

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The purposes of this paper are, firstly, to explore the role of boron in studying ancient sedimentary environment, secondly, to use salinity as a parameter in the evaluation of source rocks. The works on Cretaceous-Tertiary Sequences in Qianjiang depression of Jianghan Basin indicate that in the study of ancient environment, boron in clay minerals is an effective indicator for salinity. For both the entire sedimentary sequence and the individual rhythms, boron can indicate the relative variations of salinity. Since the source of lacustrine sediments may de multiple, the content of boron in clay minerals of terrestrial sediments may also be rather high. Therefore, for distinguishing whether it is of marine or nonmarine facies, several indicators should be utilized together. The relationship between salinity of the sections and their source rock indicators shows that the sediments favorable for oil generation in a salt-bearing basin are the beds with low salinity and the rhythmic beds strongly desalinated. However, as to the individual rhythms, the argillaceous rocks below the saliferous sections representing the most desalinated environment are most favorable for oil generation, especially the oil shale at the upper and middle parts.

1982, 4(2): 149-152. doi: 10.11781/sysydz198202149

Abstract(409) PDF-CN(194)

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1982 Vol. 4, No. 2

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