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Quantitative reconstruction of formation paleo-pressure in sedimentary basins and case studies

Science China Earth Sciences 2020年第6期63卷 808-821页

作者： Nansheng QIU Yifeng LIU Wen LIU Jingkun JIA State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China College of Ocean Zhejiang UniversityZhoushan 316021China Institute of Geomechanics Chinese Academy of Geological ScienceBeijing 100081China

Paleo-pressure reconstruction in sedimentary basins is one of the most important aspects of hydrocarbon accumulation research.In view of the advantages and disadvantages of the current methods for paleo-pressure research,a new method to reconstruct the paleo-pressure is presented in this paper.According to the geological background,quantitative analyses of the factors that might control overpressure were first conducted to clarify the contributions of each mechanism during different geological periods.Pressure evolution was reconstructed by fluid-compaction modelling with constraints imposed by the paleo-pressures obtained from fluid inclusions or differential stress methods.Determining the mechanisms responsible for overpressures during geological history is the basic prerequisite for paleo-pressure research.Thus,quantitative studies were conducted of the contributions of disequilibrium compaction,gas charging,oil cracking,temperature reduction,and tectonic uplift and subsidence to overpressures.Three case studies of paleo-pressure reconstruction were performed for the Sinian strata in the Sichuan basin,Ordovician strata in the north uplift in the Tarim basin and the Permian strata in the Sulige Gas Field in the Ordos basin,where these three study sites are normally pressured,weakly over-pressured and abnormally low pressured at present,respectively.The new method developed in this paper is very important for the practical reconstruction of the paleopressure in marine strata and ancient strata in deep basins.

关键词： Formation pressure Fluid inclusion Differential stress basin modelling Overpressure marine basin

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Methods of Studying Petroleum Systems in Residual basins-A Case Study of Mesozoic and Palaeozoic marinebasins in Southern China

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Acta Geologica Sinica(English Edition) 2002年第2期76卷 205-220页

作者： ZHAO Zongju, ZHU Yan, YANG Shufeng, WANG Genghai,XU Yunjun, FENG Jialiang and DENG Hongying Department of Geoscience, Zhejiang University, Hangzhou 310027, Zhejiang Hangzhou Institute of Petroleum Geology, Hangzhou 310023, Zhejiang Zhou Jian Fei Zhenbi Zhejiang Univ Dept Geosci Hangzhou 310027 Peoples R China Hangzhou Inst Petr Geol Hangzhou 310023 Peoples R China

Through an integrated study of Mesozoic and Palaeozoic petroleum geology insouthern China and a summing-up of the results of exploration, the authors tentatively put forward aset of methods of studying petroleum systems in modified residual basins or superposed basins. Itscore idea is to put emphasis on the study of the dynamic evolution of petroleum systems. Thetempo-spatial evolution, hydrocarbon-generating processes and hydrocarbon-generating intensities andamounts of resources in different geological stages of chief source rocks are mainly deducedbackward by 3-D basin modelling. The regularities of formation and destruction of oil and gasaccumulations are summarized by analyzing the fossil and existing oil and gas accumulations, thedirection of migration is studied by palaeo-structural analysis, and the dynamic evolution ofPalaeozoic and Mesozoic petroleum systems in southern China is studied according to stages of majortectonic movements. The authors suggest that the realistic exploration targets of Palaeozoic andMesozoic petroleum systems in southern China are secondary and hydrocarbon-regeneration petroleumsystems, while the existing primary petroleum systems are rare. They propose that the favourableareas for exploration of Palaeozoic and Mesozoic petroleum systems in southern China are the frontarea of the Daba Mountains and the steep anticlinal zone on the western side of the Shizhusynclinorium in northeastern Sichuan, the Funin-Yancheng-Hai'an-Xinghua-Baoying area in the northernJiangsu basin, the Qianjiang-Xiantao-Paizhou-Chacan 1 well area in the southern part of the Chenhuarea of the Jianghan basin, the South Poyang basin in Jiangxi and the North subbasin of the Chuxiongbasin. This view has been supported by the discovery of the Zhujiadun gas field in the Yanchengsubbasin of the northern Jiangsu basin and the Kaixiantaixi oil-bearing structure in the southernpart of the Chenhu area of the Jianghan basin.

关键词： residual basin superposed basin petroleum system marine basin southern China

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Formation and evolution of the Chinese marine basins

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Science Bulletin 2007年第S1期 1-11页

作者： JIA ChengZao1, LI BenLiang2, 3, ZHANG XingYang3 & LI ChuanXin1 1 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China 2 Resources and Information Institute, China University of Petroleum, Beijing 102249, China 3 Central Laboratory of Petroleum Geology Research, Research Institute of Petroleum Exploration and Development, Beijing 100083, China

There are plenty of petroleum resources in the Chinese marine basins, which will be the potential exploration regions of petroleum in the 21st century. The formation and evolution of the Chinese marine basins have mainly undergone two major tectonic epochs and five tectonic evolution stages. The first major tectonic epoch is the early Paleozoic plate divergence and drifting epoch during which the marine basins were formed, and the second one is the late Paleozoic plate convergence and collision epoch during which the pre-existent marine basins were superimposed and modified. The five tectonic evolution stages include: ① the drifting of micro-continental plates in Oceans and the formation of marine basins mainly filled with carbonate rocks during Proterozoic-Middle Carboniferous; ② the northward collage and convergence of continental plates and the development of the paralic sedimentary basins during Late Carboniferous-Middle Triassic; ③ the tectonically stabilized stage after the plate collage and the superimposition of lacustrine basins controlled by the inland subsidence during Late Triassic-Early Cretaceous; ④ the stage of the inland deformation and successive deep burial, uplifting, erosion or breakage of marine basins influenced by the plate tectonic activities of Neo-Tethys Ocean and the West Pacific developed in Late Cretaceous-Paleocene; ⑤ the stage of the foreland compression and basin-range coupling in the margin of the marine basins caused by the collision between India and Eurasia Plates and its long-distance effect since Neocene. The process of the tectonic evolution has controlled the petroleum geologic characteristics of Chinese marine basins, and a material foundation for the formation of oil and gas reservoirs has been built up via the formation of Paleozoic ma- rine basins, and the Mesozoic-Cenozoic tectonic superimposition and modification have controlled the key conditions of hydrocarbon accumulation and preservation. From the Late Proterozoic to the Early Paleozoic, the stratigraphic sequence

关键词： marine basin plate tectonics tectonics evolution petroleum exploration

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