川西坳陷须家河组气藏与古构造关系

doi:10.11743/ogg20050215

Abstract

Abstract:

According to the geologic conditions of Xujiahe Formation in western Sichuan depression to be characterized by super-deep, overpressure, super-tight and super-late structures, systematic analysis of hydrocarbon generation history, pore evolution history and structural evolution history of the known Zhongba, Hexingchang and Pingluoba gas reservoirs and analysis of both positive and negative exploration cases have been made.It has been clear that palaeostructures have acted as the basis of gas accumulation. Yanshanian palaeohigh zone determined the distribution of gas reservoirs, characterized by common early reservoiring, and palaeostructural-diagenetic traps to be the main types of hydrocarbon traps in the study area. Gas reservoirs in Xujiahe Fm in western Sichuan depression have experienced several evolution stages, including conventional trapping in the early stage, suspension in middle period and reconstruction in late stage. Majing-Deyang area, where there is Yanshanian palaeohigh, has experienced similar evolution process, thus it might be a prospective play.

Key words: western Sichuan depression, palaeostructure, reservoiring pattern, Xujiahe Formation, palaeostructural-diagenetic trap, structural evolution

CLC Number:

TE112.3

Cao Lie, An Fengshan Wang Xin. Relationship between palaeostructure and gas reservoirs in Xujiahe Formation in western Sichuan depression[J]. Oil & Gas Geology, 2005, 26(2): 224-229.

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Relationship between palaeostructure and gas reservoirs in Xujiahe Formation in western Sichuan depression

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