川西坳陷须家河组天然气成藏模式探讨

doi:10.11743/ogg20060609

Abstract

Abstract:

Xujiahe Formation can be divided into a lower and an upper reservoir assemblages Pooling modes for the former are thought to be high-pressure drive and low-pressure suction and pull and that for the later are regarded as water-soluble gas migration and release and buoyancy transmitting gas through dominant pathway.For the high pressure drive mode,the controlling factor of gas enrichment is the existence of 'faulted but unbroken'fracture system superimposed on the early palaeostructure,and for the low-pressure suction and pull mode,the key factors of gas pooling include sufficient gas source,open faults,compressional structure suction,and decompression by stratum denudation.For the water-soluble gas migration and release mode,the determining elements of gas reservoiring are the continuous migration of structural high,late uplift,and low relief structural and lithologic combination trap with good physical properties;for the mode of buoyancy transmitting gas through dominant pathway,the crucial condition for gas reservoiring is the existence of effective traps on dominant pathway.

Key words: reservoiring assemblage, reservoiring mode, western Sichuan, dominating factors, Xujiahe Formation

CLC Number:

TE112.3

Yang Keming. Gas reservoiring mode in Xujiahe Formation of western Sichuan depression[J]. Oil & Gas Geology, 2006, 27(6): 786-793,803.

References

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Gas reservoiring mode in Xujiahe Formation of western Sichuan depression

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