川西前陆盆地南段薄皮冲断构造之下隐伏裂谷盆地及其油气地质意义

doi:10.11743/ogg20060404

Abstract

Abstract:

Seismic interpretation reveals the rift basin in the south segment of the western Sichuan foreland basin,which had been developed before Permian,might be filled up with thousands of meters of Silurian-Carbo-(niferous) strata.The late stage of the area had gone through a tectonic compression in the Cenozoic,and as a result,the foreland basin exhibits a double-layer structure characterized by shallow fold-thrust structures and deep rift basins.The shallow structures consist of some flat-and ramp-related thrust faults and the associated fault bend folds,while the deep structures occur as graben-type basins and half-graben-type basins,which had experienced local positive inversion,resulting in the synchronous folding of the Permian,Mesozoic,and Cenozoic.The deep rift structures,to some extent,controlled the development of the shallow ones.It is suggested that the deep rift basins in the Paleozoic and the inverted anticlines in the Paleozoic and Mesozoic in the south segment in western Sichuan foreland basin may have large hydrocarbon potentials,thus are frontiers for exploration.

Key words: positive inversion, rift basin, foreland basin, Permian, structural interpretation, oil and gas exploration, Sichuan basin

CLC Number:

TE111.1

Chen Zhuxin, Jia Dong, Wei Guoqi, Li Benliang, Zeng Qing, Yang Guang. Buried rift basins under the Thin-skinned Fold-Thrust Belts in the South Segment of the western Sichuan Foreland Basin and their Geological Significance[J]. Oil & Gas Geology, 2006, 27(4): 460-466,474.

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Buried rift basins under the Thin-skinned Fold-Thrust Belts in the South Segment of the western Sichuan Foreland Basin and their Geological Significance

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