西南石油大学学报(自然科学版)

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Depositional System and Gas Potential of Shanxi Formation and Member 8#br# of Xiashihezi Formation in Southwest Ordos Basin

Guo Xiaojun1*, Chen Shiyue2, Wang Lianguo1, Li Desheng3, Liu Lang3   

  1. 1. The Eleventh Oil Production Plant,Changqing Oilfield Company,PetroChina,Qingyang,Gansu 745000,China
    2. School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China
    3. The Second Oil Production Plant,Changqing Oilfield Company,PetroChina,Qingcheng,Gansu 745100,China
  • Online:2015-10-01 Published:2015-10-01

Abstract:

The main provenances of the Shanxi Formation and Member 8 of Xiashihezi Formation in southwest Ordos Basin
are analyzed on the basis of field geological profile,the core wells,logging data single factor graphs such as stratigraphic
thickness,sand thickness and sand ratio are plotted. Combined with sedimentary facies of single well facies profile and well
comparing to profile,we find the sedimentary period of Shanxi formation mainly include meandering river,meandering river
delta and shallow lake facies. During the deposition of Member 8 of Xiashihezi Formation,braided river,braided river delta
and shallow lake facies developed. Shibangou-Huanxian,Pingliang-Zhenyuan-Qingyang,Kouzhen-Xunyi-Zhengning delta
succession develop in the Shanxi Formation and Member 8 of Xiashihezi Formation. Study area has good hydrocarbon source
rock and reservoir and cap conditions. According to the source rock,reservoir,cap characteristics and well logging,gas test
results,we select“Zhenyuan-Qingcheng-Huanxian”as favorable exploration area and“Xunyi-Chunhua”exploration target
area. Althoughnatural gas exploration degree is not adequate,the exploration potential is tremendous in southwest Ordos
Basin.

Key words: Ordos Basin, Shanxi Formation, Member 8 of Xiashihezi Formation, depositional system, natural gas

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