Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 56-63.doi: 10.3969/j.issn.1673-8926.2016.02.008

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Characteristics of source-reservoir-caprock assemblage and hydrocarbon accumulation of Yanchang Formation in Binchang block, Ordos Basin

Chen Hehe 1，2， Zhu Xiaomin1， Chen Chunfang2， Yin Wei2   

  1.  1. College of Geosciences ， China University of Petroleum ， Beijing 102249 ， China ； 2. Sinopec Research Institute of Exploration & Production ， Beijing 100083 ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

Based on the data of geochemistry, cores, logs and oil test, this paper analyzed the characteristics of sourcereservoir-caprock assemblage and hydrocarbon accumulation of Yanchang Formation in Binchang block, Ordos Basin. The result shows that the Zhangjiatan shale at the bottom of Chang 7 oil reservoir is hydrocarbon source rock of Yanchang Formation in Binchang block. The sand bodies of delta front underwater distributary channel and gravity flow in Chang 8 to Chang 6 oil reservoir set act as reservoir. The dark mudstone of semi deep-deep lake facies in Chang 9 to Chang 4+5 oil reservoir set act as caprock. Four sets of source-reservoir-caprock assemblages were divided: （1） Chang 7 as source, Chang 91 as reservoir and upper Chang 9 as caprock; （2） Chang 7 as source, Chang 81 as reservoir and Chang 7 as caprock; （3） Chang 7 as source, Chang 72 as reservoir and upper Chang 7 as caprock; （4） Chang 7 as source, Chang 63 as reservoir and Chang 6-Chang 4 as caprock. According to the configuration relationship between source and reservoir and the stacking patterns of source, reservoir and cap, the source-reservoir-caprock assemblage can be divided into successive type （2 and 3） and discontinuous type （1 and 4）. The successive type of assemblage is controlled by the distribution of Zhangjiatan shale, reservoirs quality and the development degree of fault-fracture system. The discontinuous type of assemblage is controlled by the oil source, faults, the distance between source and reservoir as well as the distribution of favorable reservoirs. Successive type of assemblage has advantages in hydrocarbon injection, seal quality and higher oil saturation compared to discontinuous type assemblage.

Key words: high resolution , sequence stratigraphy , base level cycle , sedimentary facies , Yanchang Formation , Ordos Basin

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