Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 11-19.doi: 10.3969/j.issn.1673-8926.2017.04.002

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Deep-water turbidite characteristics and its reservoir development of Chang 7 oil layers in southwestern Ordos Basin

WANG Jianmin1, WANG Jiayuan2,3   

  1. 1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Aerosol Chemistry & Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
    3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
  • Received:2016-09-13 Revised:2016-11-10 Online:2017-07-21 Published:2017-07-21

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Abstract: Aiming at the genesis of the deep-water reservoir in lacustrine basin and the potential of petroleum exploration, the deep-water turbidite characteristics and its influence on the reservoirs development of Chang 7 oil layers in LM well field in the southwestern Ordos Basin were studied according to logging,testing,experiments and producing test data, based on single well facies and logging facies analysis. The results show that Chang 7 oil layers can be divided into three sub oil layers and four sub-layers. Chang 73 sub oil layers in the lower Chang 7 developed a large set of oil shale,and Chang 72 and Chang 71 sub oil layers in the middle and upper Chang 7 developed a large set of turbidite and typical Bouma sequence,all of which constituted a complete deep-water turbi-dite facies sequence. The sedimentation can be sequentially divided into three subfacies including turbidite middle fan, turbidite lower fan and deep-water basin, as well as six microfacies types including turbidite channel, interchannel overflow,front channel overflow, turbidite endings, mud shale and oil shale. This large deep-water turbidite fan is dominated by turbidite middle fan and controlled by the southwest provenance and drainage system,with good sandbody continuity,connectivity and composition,and became the major genetic types for Chang 7 effective deep-water reservoir. With good oil show,and great exploration potential, the turbidite fan is an effective prospect for petroleum exploration on deep-water sediments.

Key words: oil reservoir zones, spatial distribution, sedimentary characteristic, Buqu Formation, southern Qiangtang Depression

CLC Number: 

  • TE111.3
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