中国中西部四大盆地碎屑岩油气地质与勘探技术新进展

doi:10.11743/ogg20120401

Abstract

Abstract:

Since Late Paleozoic,the four large-sized petroliferous basins (i.e.Ordos,Sichuan,Junggar and Tarim) in central-western China have experienced similar evolution processes during different geologic time,and have two kinds of petroleum exploration plays in clastic strata,i.e.self-source and self-reservoir type and marine-source continental-reservoir type.The clastic sequences deposited in compressional environments have "dual system tract structure",which determines the high quality of the exploration plays.Three types(inner-sourcing,out-sourcing and hybrid-sourcing)and six subtypes of petroleum accumulation systems can be identified in the clastic sequences.The differences in tectonic deformation among these four basins result in the differences in their petroleum accumulation system distributions.A technique series consisting of 3D 3C seismic acquisition,processing and interpretation has been developed for fractured reservoir prediction.Seismic acquisition and processing techniques for loess tableland are developed to identify tight reservoirs and subtle traps.Fracturing techniques are developed for stimulation of the fractured tight reservoirs in western Sichuan depression.Compensation fracturing techniques are developed for stimulation of the tight sands in southern Ordos Basin.The advances in petroleum geologic theories and exploration techniques have promoted the discovery of the large- to medium-sized oil and gas fields (such as gas reservoirs in the 2^nd member of Upper Triassic Xujiahe Formation,the classtic oil reservoirs in Tahe area,the Zhenjing oil field in southern Ordos Basin).

Key words: reservoir prediction, reservoir stimulation, petroleum accumulation system, clastic strata, central-western China

CLC Number:

TE112.3

Zheng Herong. New advances in petroleum geology and exploration techniques of clastic reservoirs in the four large-sized basins in central-western China[J]. Oil & Gas Geology, 2012, 33(4): 497-505.

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New advances in petroleum geology and exploration techniques of clastic reservoirs in the four large-sized basins in central-western China

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