China Petroleum Exploration ›› 2018, Vol. 23 ›› Issue (4): 95-106.DOI: 10.3969/j.issn.1672-7703.2018.04.011

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics and main controlling factors of microbial carbonate reservoir: a case study of upper member of Lower Cambrian Xiaoerbulake Formation in Akesu area, Tarim Basin

Bai Ying, Luo Ping, Liu Wei, Zhai Xiufen, Zhou Chuanmin   

  1. PetroChina Research Institute of Petroleum Exploration & Development
  • Received:2016-11-23 Revised:2018-06-07 Online:2018-07-15 Published:2018-07-11
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Abstract: Through observation of field outcrops, identification of thin section and physical property analysis, the characteristics and main controlling factors of microbial carbonate reservoir in the upper member of Lower Cambrian Xiaoerbulake Formation in Akesu area, Tarim Basin have been examined in detail. It is concluded through the study that two kinds of megascopic structures are developed, including microbial reef and microbial layer in this member; the former includes thrombolite reef and Epiphyton reef, and the later contains thrombolite, Epiphyton, stromatolite, laminite and spongiostromata biostromes. The microbial carbonate contains a variety of pores related to microbes and also non-microbial reservoir space. Thrombolite reef and spongiostromata biostrome are the most favorable microbial reservoirs, indicating different types of microbialite reservoirs differ widely in physical properties. The comparison of Yutixi profile with Sugetbulak profile shows that even the same type of microbialite reservoirs differ considerably. This is because the formation and preservation of microbial carbonate reservoirs are affected by the distribution of sedimentary facies, ancient landform features, diageneses and microbial structures.

 

Key words: microbial carbonate, reservoir, Lower Cambrian, Xiaoerbulake Formation, Tarim Basin

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