低效气藏地质特点和成因探讨

doi:10.11743/ogg20040519

Abstract

Abstract:

Low-efficiency gas reservoirs refer in particular to those with low abundance of reserves and low well productivity.The reserves of such reservoirs in China account for about 70% of our total gas reserves.In China, reservoir rocks of such gas reservoirs are commonly of fluvial and delta facies with relatively large burial depth,which are characterized by poor continuity,low porosity and permeability,as well as strong heterogeneity.As a result,exploration and development of these reservoirs are quite difficult.For the sake of effectively utilizing these gas resources,the characteristics of low-efficiency gas reservoirs in continental clastic rocks have been analyzed,based on systematic correlating the geological features of low-efficiency gas reservoirs both in China and abroad.It is believed that the types of sedimentary facies and diagenesis are two major geologic factors leading to low efficiency of reservoirs.Sedimentary facies control the poroperm characteristics and continuity of reservoirs,while compaction and cementation are the main factors that destroy primary pores and lead to the formation of tight sandstones.

Key words: low-efficiency gas reservoir, geologic features, correlation, origin

CLC Number:

TE112.33

Gu Li, Yu Xinghe, Li Shengli, Xu Anna, Zhu Yixiang, Tian Changbing. A discussion on geologic features and genesis of low-efficiency gas reservoirs[J]. Oil & Gas Geology, 2004, 25(5): 577-581.

References

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A discussion on geologic features and genesis of low-efficiency gas reservoirs

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