Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 36-47.doi: 10.12108/yxyqc.20200404

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of fractured bedrock gas reservoir in Jianbei gas field,Qaidam Basin

CHEN Gengxin1, WANG Jiangong1, DU Binshan1, LIU Yingru1, LI Yanli1, YANG Huijie2, LI Zhiming1, YU Xiaofeng1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China;
    2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736200, Gansu, China
  • Received:2019-04-25 Revised:2019-08-07 Online:2020-08-01 Published:2020-06-16

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Abstract: In order to clarify the bedrock reservoir characteristics of Jianding Mountain area in front of Altun Mountain in Qaidam Basin, the petrology,mineralogy,reservoir space type,fracture development characteristics and gas-bearing controlling factors were systematically studied by using core data,rock section,mercury injection curve,industrial CT,scanning electron microscopy and logging data. The results show that:(1)The bedrock in Jianbei area is mainly composed of massive variegated quartz diorite and granodiorite, and the reservoir spaces include weathering leaching dissolved pore,matrix micropore,fracture and dissolved pore in fracture.(2)Bedrock fractures can be divided into two types,one is structural fracture with 2-stage genesis,the other is diagenetic cleavage fracture, both of which are controlled by basement fracture. The reservoir spaces of the weathering and leaching zone of bedrock include dissolved pores and fractures formed by weathering and leaching. Both macropore throat and micro-pore throat are well developed,but the micro-pore throat is main. The connection pore diameter is mostly 1-5 μm. The distance from the top of bedrock determines the quality of reservoir. The reservoir spaces of fracture dissolution zone include fractures and dissolved pores in fracture. The structural activity in geological history period controls the reservoir quality. The research results can be used for reference in oil and gas exploration of weathered crust of bedrock.

Key words: granodiorite, fracture, dissolved pore, bedrock gas reservoir, Jianbei area, Qaidam Basin

CLC Number: 

  • TE122.1
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