Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 24-34.doi: 10.12108/yxyqc.20190204

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Characteristics and accumulation conditions of Cretaceous dolomitic mudstone gas reservoir in Hari Sag,Yin'e Basin

LIU Huchuang, WANG Wenhui, CHEN Zhijun, ZHAO Chunchen, PAN Binfeng, BAI Xiaoyin   

  1. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China
  • Received:2018-09-25 Revised:2018-12-08 Online:2019-03-21 Published:2019-03-21

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Abstract: In recent years,great discoveries of natural gas exploration have been made in Cretaceous dolomitic mudstone in Hari Sag. For revealing the reservoir characteristics,accumulation conditions,gas reservoir distribution and its controlling factors of mudstone gas reservoirs,the studies on tectonic setting,petrologic features, physical properties,organic geochemical test and sealing conditions evaluation of source rock were carried out, and favorable exploration areas were predicted by using seismic data. The results show that (1) Hari Sag was a half graben-like basin which experienced multiple tectonic activities. On the background of continuous subsidence,mudstone reservoir formed. (2) Source rocks were composed of lime mudstone and dolomitic mudstone with abundant over-maturity organic materials. There were many types of micropore and microfracture in part of mudstone reservoir,which supplied good reservoir space for natural gas accumulation. (3) Stable tectonic setting and excellent sealing conditions prevented the loss of oil and gas effectively. Abundant natural gas was accumulated in the source and its reserve was approximately 243.2×108 m3. The deep region of half graben-like basin was the favorable area for the mudstone gas reservoir exploration. The research results have important implications for exploration of mudstone gas reservoirs in Yin'e Basin.

Key words: dolomitic mudstone gas reservoir, over-maturity, micropore, hydrocarbon accumulation in source rocks, Cretaceous, Hari Sag, Yin'e Basin

CLC Number: 

  • TE122.2
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