鄂尔多斯盆地神木气田二叠系太原组天然气成藏条件

doi:10.11743/ogg20130105

Abstract

Abstract:

In order to further reveal natural gas reservoir forming conditions and its main controlling factors in Shenmu gas field,Ordos Basin,this paper systematically analyzed the hydrocarbon generation conditions,reservoir characteristics,reservoir and seal conditions,source-reservoir-cap assemblage and key controlling factors of gas accumulation in the Taiyuan Formation by using theories of petroleum geology and hydrocarbon accumulation in combination with geochemical characteristics.The results indicate that Benxi Formation,Taiyuan Formation and coal seams in the 2^nd member of Shanxi Formation are high quality source rocks for the Taiyuan Formation reservoir,and have high organic content which is favorable for hydrocarbon generation.The shale in the 2^nd member of Shanxi Formation has dual sealing mechanisms (i.e.capillary seal and hydrocarbon concentration seal) with strong sealing capacity,which are favorable for hydrocarbon preservation.The reservoir lithology of the Taiyuan Formation is dominated by quartz sandstone and lithic quartz sandstone with low porosity and low to extra-low permeability due to the control of both provenance and sedimentation.However,local high-yield pay zones still exist due to the development of quartz sandstone reservoirs.Physical properties are the main factors controlling hydrocarbon accumulation of the Taiyuan Formation in this area.Mapping quartz sandstone distribution is the key to reduce drilling risk and to ensure high yield of gas wells.

Key words: source rock, reservoir rock, accumulation condition, Taiyuan Formation, Shenmu gas field, Ordos Basin

CLC Number:

TE122

Meng Xiaoling, Zhang Hongbo, Feng Qianghan, Zhang Baoguo, Wang Caili, Wang Zhunbei. Gas accumulation conditions of the Permian Taiyuan Formation in Shenmu gas field, Ordos Basin[J]. Oil & Gas Geology, 2013, 34(1): 37-41.

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Gas accumulation conditions of the Permian Taiyuan Formation in Shenmu gas field, Ordos Basin

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