Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 30-38.doi: 10.3969/j.issn.1673-8926.2018.01.003

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Hydrocarbon accumulation conditions and main controlling factors of Chang 7-Chang 9 oil reservoirs of Yanchang Formation in Donghan region,Ordos Basin

CAO Yue1, LIU Yanzhe1, CHEN Yiguo1, MENG Wangcai1, GAO Pengpeng2   

  1. 1. Research Institute of Shaanxi Yanchang Petroleum Group Co., Ltd., Xi'an 710075, China;
    2. English for Special Purposes Research Centre, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2017-07-27 Revised:2017-09-26 Online:2018-01-21 Published:2018-01-21

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Abstract: The exploration degree is still low in Chang 7-Chang 9 oil reservoir of Upper Triassic in Donghan region of Ordos Basin. Based on the drilling and logging data from 87 wells and thin section observation,physical property analysis and oil test for 15 wells,under the guidance of geology theory of tight hydrocarbon accumulation,the source rocks,sedimentary microfacies,reservoir properties and cap rock were studied,and the main controlling factors of reservoir were discussed in terms of reservoir distribution,source rocks,sedimentary microfacies, structure and cap rock. The results show that:(1)Two sets of hydrocarbon source rocks are developed in Chang 7 and Chang 9 oil reservoirs,with Chang 7 source rock being the main source rocks. Subaqueous distributary channel and subaqueous interdistributary bays are developed,the fine sandstone in subaqueous distributary channel is the main reservoir,and lithic feldspathic sandstone is the main rock type,with poor physical properties. Mud shale deposited during the lake flooding period and mudstone in distributary bay are the main cap rocks; (2)The effective matching among hydrocarbon source rocks,sedimentary microfacies,superimposed contiguous lithologic changing zones of subaqueous distributary channel in delta front,and nose uplift zones,is the key for reservoir-forming and exploration breakthrough of tight sandstone.(3)There are two types of hydrocarbon reservoir assemblage,the type of self-generation and self-storage is dominated in Chang 7 oil reservoir,and the type of upper-generation and lower storage is dominated in Chang 8 oil reservoir. The results are helpful for guiding the deep exploration and deployment in this area,and also have reference significance for similar areas.

Key words: carbonate rocks, acoustic logging, frequency spectrum analysis, anisotropy

CLC Number: 

  • TE122
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