Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 36-45.doi: 10.3969/j.issn.1673-8926.2017.05.005

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Geological controls on hydrocarbon accumulation of Chang 2 oil reservoir in Ordos Basin:a case from Renshan area, Yongning Oilfield

XIEWei1,2, WANG Yanfeng1, LI Hong2   

  1. 1. Zhidan Oil Production Plant, Shaanxi Yanchang Oil(Group) Limited Company, Yan'an 717500, Shaanxi, China;
    2. Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2017-01-14 Revised:2017-03-06 Online:2017-09-21 Published:2017-09-21

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Abstract: To discuss the geological controls on hydrocarbon accumulation of Chang 2 reservoirs in Yongning Oilfield, Ordos Basin,based on testing results of fifty core samples,ninety-well logging and oil production data, Chang 2 sedimentary microfacies and sandstone reservoir properties were analyzed.The Chang 2 sedimentary system is meandering fluvial,including channel sandbars,natural levees,and flood plains. Channel sandbars are mainly composed of fine to medium grained arkose and debris-arkosic sandstones.The grain sizes of channel sandstones are fining upward and appear "two-segments" in granulation curves. Chang 213 sandstones is the best reservoir with average porosity of 11.6%. The pores of Chang 213 reservoir are mainly residual intergranular pores and secondary dissolution pores. The cementation of chlorite coating,authigenic kaolinite and dissolution of feldspars and detritus are important diageneses in the sandstones. The crystallinity of authigenic illites ranges from 0.57 to 0.88, which indicates an "A stage" of burial middle digenetic stage. According to analysis of sedimentary facies,reservoir properties,regional structures and distributions of source rocks,the hydrocarbon accumulations of Chang 2 reservoirs are considered to be controlled by the local nose-like structures and the distance from source rocks. Southwestern Renshan area is potential for Chang 2 oil exploration.

Key words: coalbed methane, adsorption, desorption, coal rock, dual media, cleat, matrix, capillary pressure

CLC Number: 

  • TE122.2
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