Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (3): 66-72.doi: 10.3969/j.issn.1673-8926.2007.03.012

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Sedimentary microfacies of the second member of Hetaoyuan Formation in Xia’ermen Oilfield , Biyang Sag , Nanxiang Basin

LI Qi1,CHEN Zhenlin1,TIAN Jianfeng2,GUO Qiling1,GUO Guangfei1,SHU Kedong1   

  1. 1. Faculty of Earth Resources , China Uni versity of Geosciences , Wuhan 430074 , China;
    2. College of Oil and Gas Resources , Xi’an Shiyou University , Xi’an 710065 , China
  • Online:2007-09-15 Published:2007-09-15

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Abstract:

The reservoir heterogeneity of the second member of Hetaoyuan Formation in Xia’ermen Oilfield is strong and the adjacent well productivity is greatly different. On the basis of the data of core, well logging and grain size, the division and characteristics analysis of sedimentary microfacies of the second member of Hetaoyuan Formation are carried out, and the shape and distribution of the reservoir sand body and the mode of sand body superposition are analyzed. The result showed that Ⅱ—Ⅴoil2bearing layer of the second member of Hetaoyuan Formation developed braided river delta front subfacies deposit , which can be divided into five sizes of sedimentary microfacies and creeping turbidite sand body. The sedimentary microfacies include subsea distributary channel, mouth bar, distal bar, front sheet sand and distributary interchannel, among which the subsea distributary channel and mouth bar are the favorable facies belt s of the study area.

 

Key words: trace elements, paleosalinity, quantitative recovery, lake shoreline, Chang 6 member, lithostratigraphic reservoirs, Ordos Basin

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