裂谷盆地致密砂岩气成藏机制与富集规律——以松辽盆地与渤海湾盆地为例

doi:10.11743/ogg20170601

Abstract

Abstract: Tight sandstone gas in rift basins is a new play concept for exploration.This paper takes the Songliao Bbasin and the Bohai Bay Basin as case areas to systematically investigate the mechanisms for gas accumulation and enrichment in tight sandstones.The reservoir characteristics of tight sandstone gas in rift basins have been studied,which are different from those of craton basins.As to gas accumulation mechanism,it is demonstrated that multiple factors have accelerated the generation of gas by source rock,and multiple sediment provenance have ensured deposition of favorable reservoirs.Both the long gas migration distance and tightening of the reservoir before gas charge favors gas accumulation in multiple sections over large areas.For the enrichment controlling factors,it is concluded that the distribution of gas pools and source kitchens are located along the faulted troughs,the reservoir quality is controlled by facies and tectonic belts,while the vertical distribution of flowable gas sections is controlled by development of secondary porosity zones.Finally,the exploration potential and future exploration concepts of these two basins is analysed.

Key words: gas reservoir characteristic, accumulation mechanism, tight sandstone gas, rift basin, Songliao Basin, Bohai Bay Basin

CLC Number:

TE122.3

Li Jian, Jiang Xiaohua, Wang Xiuqin, Cheng Honggang, Hao Aisheng. Mechanisms for gas accumulation and enrichment in tight sandstone reservoir in rift basins:Cases from the Songliao Basin and the Bohai Bay[J]. Oil & Gas Geology, 2017, 38(6): 1005-1018.

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Mechanisms for gas accumulation and enrichment in tight sandstone reservoir in rift basins:Cases from the Songliao Basin and the Bohai Bay

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