川西坳陷的复合构造与油气关系

doi:10.11743/ogg20050213

Abstract

Abstract:

Compound structures, such as coaxial superimposed, cross-over and mitre types, are common in western Sichuan depression as a result of multistage tectonic events. They have been formed early, thus would have been favorable for timely migration and accumulation of gas prior to the tightening of Xujiahe Formation sandstones. Compounding of structures would be favorable for the formation of crush structures, which would have improved the percolating conditions of the reservoirs and productivity of gas wells, and would have established communication between deep source rocks and shallow reservoirs, leading to the formation of gas pools far from their sources. The large fracture in western Sichuan depression has been formed as a result of multistage tectonic events and has led to the destruction of gas pools. Medium and small gas pools might have been preserved in areas far from the large fracture, due to the inhomogeneity of the reservoirs.

Key words: compound structure, early reservoiring, low porosity and low permeability reservoir, later reconstruction, western Sichuan depression

CLC Number:

TE111.2

Deng Kangling, Yu Fulin. Compound structures and hydrocarbons in western Sichuan depression[J]. Oil & Gas Geology, 2005, 26(2): 214-219.

References

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Compound structures and hydrocarbons in western Sichuan depression

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