A SEDIMENTARY CLASSIFICATION OF MESO-CENOZOIC CONTINENTAL BASINS IN CHINA

Qiu Dongzhou

According to three principle factors controlling sedimentation of a basin (inundation of waters, changes of climate and structural movement), the continental basins in China can be classfied into two groups, each of them can be divided into three types respectively, and each of types can be differentiated into three species further. Normally and abnormally continental basins 1. Normally continental basins (type Mo) They developed in the interior of continent where were far from the coast and a higher elevation relatively. The transgression did not affcet the depositional process. The main factors that controlled the deposition were continental structure, climate, hydrology and organisms. The dark clays and carbonates deposited in these basins under humid and semi-dry climate have the ability of generating oil and gas in some extent. 2. Abnormally continental basins (type M1) They developed in the area where were offshore or lower elevation. The transgression affected the depositional process. Their properties of deposition, geochemistry and organisms have both characteristics of marine and continental facies. They were connected with sea or connected intermittently by channel. The clays and carbonates formed in transgression are favourable source rocks. The sand bodies formed in regression have fair reserviors. Basins developed under arid, moist and transition climate 1. Basins developed arid condition (type C1) Their characteristics are that they contain red clastic rocks, carbonates, sulphate rocks and chlorate minerals. The species of organisms is monotonous. A fair thickness of the source rock deposited in these basins while the supply of the sea water increased or the evaporating amount of the water decreased and basins sank continously. 2. Basins developed under moist condition (type C2) Their characteristics are that they have a large amount deposits derived from swamp envirnoment. Dark clays in the basins are good source rocks. Fluvial and delta sand bodies are considered to be reserviors. 3. Basins developed under transitional climate (type C3) The characteristics of deposition, geochemistry and organisms are between that of the arid basins and the moist basins. The deposits deposited in these basins are common source rocks. Faulted basins, depressional basins and faulted-depressional basins 1. Faulted basins (type S1) The process of generation and development of basins was mainly controlled by fault. Thicker source rocks would be deposited when basins was deficient of deposits, and a lithologic and structural oil poll would be formed when source rocks deposited well with fair reserviors in this area. 2. Depressional basins (type S2) Their generation and development were controlled mianly by depression. The lithology and lithofacies changed steadily. The source rock-reservior-cap rock relationship is fairly good. It contains big oil-gas accumulations usually. 3. Faulted-depression basins (type S3) The generation was controlled by mechanism of faulted-depression and depressional basin. The characteristic3 of deposits and oil gas are between type S1 and type S2. In conclusion, a classfication of basins according to three factors controlling the sedimentation of basins, is singificant for forecasting oil and gas prospect.

Comprehensive Institute of Petroleum Geology, Ministry of Geology and Mineral Resources

Received Date: 1986-10-28

Publish Date: 1988-06-10

Abstract: According to three principle factors controlling sedimentation of a basin (inundation of waters, changes of climate and structural movement), the continental basins in China can be classfied into two groups, each of them can be divided into three types respectively, and each of types can be differentiated into three species further. Normally and abnormally continental basins 1. Normally continental basins (type Mo) They developed in the interior of continent where were far from the coast and a higher elevation relatively. The transgression did not affcet the depositional process. The main factors that controlled the deposition were continental structure, climate, hydrology and organisms. The dark clays and carbonates deposited in these basins under humid and semi-dry climate have the ability of generating oil and gas in some extent. 2. Abnormally continental basins (type M1) They developed in the area where were offshore or lower elevation. The transgression affected the depositional process. Their properties of deposition, geochemistry and organisms have both characteristics of marine and continental facies. They were connected with sea or connected intermittently by channel. The clays and carbonates formed in transgression are favourable source rocks. The sand bodies formed in regression have fair reserviors. Basins developed under arid, moist and transition climate 1. Basins developed arid condition (type C1) Their characteristics are that they contain red clastic rocks, carbonates, sulphate rocks and chlorate minerals. The species of organisms is monotonous. A fair thickness of the source rock deposited in these basins while the supply of the sea water increased or the evaporating amount of the water decreased and basins sank continously. 2. Basins developed under moist condition (type C2) Their characteristics are that they have a large amount deposits derived from swamp envirnoment. Dark clays in the basins are good source rocks. Fluvial and delta sand bodies are considered to be reserviors. 3. Basins developed under transitional climate (type C3) The characteristics of deposition, geochemistry and organisms are between that of the arid basins and the moist basins. The deposits deposited in these basins are common source rocks. Faulted basins, depressional basins and faulted-depressional basins 1. Faulted basins (type S1) The process of generation and development of basins was mainly controlled by fault. Thicker source rocks would be deposited when basins was deficient of deposits, and a lithologic and structural oil poll would be formed when source rocks deposited well with fair reserviors in this area. 2. Depressional basins (type S2) Their generation and development were controlled mianly by depression. The lithology and lithofacies changed steadily. The source rock-reservior-cap rock relationship is fairly good. It contains big oil-gas accumulations usually. 3. Faulted-depression basins (type S3) The generation was controlled by mechanism of faulted-depression and depressional basin. The characteristic3 of deposits and oil gas are between type S1 and type S2. In conclusion, a classfication of basins according to three factors controlling the sedimentation of basins, is singificant for forecasting oil and gas prospect.

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Reference (13)

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A SEDIMENTARY CLASSIFICATION OF MESO-CENOZOIC CONTINENTAL BASINS IN CHINA

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