Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 30-38.doi: 10.12108/yxyqc.20180204

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Contact relationship and main controlling factors of braided river single channel sand body: a case of braided river from Karamay in Xinjiang, Liulin and Datong in Shanxi,Yan' an in Shaanxi

YANG Youxing1, JIN Zhenkui2, BAI Zhongkai1, GAO Yongjin1, HAN Miao1, ZHANG Jinhu1   

  1. 1. Oil & Gas Survey, China Geology Survey, Beijing 100083, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China
  • Received:2017-08-18 Revised:2017-10-10 Online:2018-03-21 Published:2018-03-21

Abstract: The contact type and controlling factors of single channel sand body in braided river are not clear. According to the observation and analysis of the braided river outcrop profile in the field, combined with the drilling and seismic data, the contact relationship of the braided river single channel sand body was studied synthetically. The results show that the contact relationship of braided river sand body can be divided into three types, including the complete contact type, local contact type and non-contact type. These three types of sand bodies are obviously different in sand body distribution, mudstone interlayer, reservoir properties and oil-bearing property. The sedimentary facies has obvious control effect on the contact relationship between the river sand bodies. The geologic slope of the near-grained braided river sedimentary facies is also steep, the water body energy is high, and the contact relationship of the river sand body is dominated by the complete contact type. The contact relationship between the sand bodies of the far-grained braided river sedimentary facies is dominated by local contact type. Sandy braided river sand body is mainly non-contact type. When the va/vs ratio is low, the channel sand body is dominated by the complete contact type, when the va/vs ratio is moderate, the channel sand body is dominated by the local contact type;and when the va/vs ratio is high, the channel sand body is dominated by non-contact type. The research result is helpful for guiding the deployment and improvement of oil recovery in oilfield development stage.

Key words: carbonate reservoirs, karstic paleochannel, Ordovician, Halahatang area

CLC Number: 

  • TE121.3
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