Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 1-11.doi: 10.12108/yxyqc.20200401

• PETROLEUM GEOLOGY •     Next Articles

Shale oil reservoir characteristics and favorable area optimization in Yingxi area,Qaidam Basin

ZHANG Daowei1, XUE Jianqin2, WU Kunyu3, CHEN Xiaodong3, WANG Mu3, ZHANG Qinghui3, GUO Ning3   

  1. 1. PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    2. Department of Geophysical Exploration, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2019-09-29 Revised:2020-02-21 Online:2020-08-01 Published:2020-06-16

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Abstract: In order to understand the characteristics of Paleogene oil shale reservoirs in Yingxi area of Qaidam Basin, the petrological characteristics,physical properties,reservoir space,oil-bearing properties and source-reservoir occurrence relationship were analyzed,and favorable reservoir development areas were optimized. The results show that:(1)mineral compositions of reservoir-rocks in the upper member of Xiaganchaigou Formation demonstrate typically mixed features,including carbonates,terrigenous clastic,argillaceous and evaporite minerals. (2)According to the comprehensive geological and logging responses characteristics,the reservoirs in the study area were divided into three types, including laminated shale/argillaceous carbonate reservoirs, massive shale/argillaceous carbonate reservoirs and phenocrystal shale/argillaceous carbonate reservoirs.(3)The main pore spaces in reservoirs include inter-crystal pores,intergranular/inter-crystal dissolved pores,inter-breccia pores and fractures. In summary,the physical properties of reservoirs are nor good,their porosities range from 4% to 6% and permeabilities range from 0.05 to 0.10 mD.(4)The reservoir is characterized by "intra-source accumulation and wholebody oil-bearing",and the oil-bearing abundance of the target layer is controlled by reservoir properties and its relationship with the source rocks. This study results have a guiding role for shale oil exploration in Yingxi area.

Key words: shale oil, intra-source accumulation, saline lacustrine, Xiaganchaigou Formation, Yingxi area, Qaidam Basin

CLC Number: 

  • TE122.1
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