Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 1-13.doi: 10.12108/yxyqc.20200301

• PETROLEUM GEOLOGY •     Next Articles

Assessment of glutenite reservoirs and optimization of prospects of Zhenzhuchong Formation in Jiulongshan gas field,Sichuan Basin

ZHANG Manlang, KONG Fanzhi, GU Jiangrui, GUO Zhenhua, FU Jing, ZHENG Guoqiang, QIAN Pinshu   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2019-07-25 Revised:2019-09-16 Online:2020-05-21 Published:2020-04-30

Abstract: Zhenzhuchong Formation in Jiulongshan gas field is known as fractured tight glutenite reservoir with strong heterogeneity. In order to make clear the development layer series and predict the favorable areas,high resolution stratigraphic sequences were divided and systematic studies were conducted on sedimentary microfacies, petrologic features,reservoir space types and fracture distribution of Zhenzhuchong Formation,by means of core description,casting thin section observation,imaging logging,full diameter core analysis,and thus to realize fine reservoir evaluation of fractured glutenite of Zhenzhuchong Formation. The results show that:(1) Zhenzhuchong Formation can be divided into three middle-term cycles and six short-term cycles,and favorable reservoirs were developed in hugely thick glutenites formed by superposed subaqueous distributary channels of fan deltaic front in middle-period cycle Ⅱ.(2) Zhenzhuchong Formation is fracture-pore type reservoir,comprised of inter-gravel and intra-gravel dissolved pores,fracture-expansion solution pores,with porosity mainly of 2.0%- 4.5%,horizontal permeability of 1-100 mD,vertical permeability of 0.1-10.0 mD,and the permeability of Zhenzhuchong Formation was highly improved by low angle fractures and fracture-networks.(3) Short-term cycle Ⅱ 3 and Ⅱ1 were selected as two favorable development layer series in which fractures were well developed and the reservoir permeability was higher than others.(4) Two first class favorable areas and three second class favorable areas were selected through single layer reservoir evaluation and integrative evaluation of multilayer composite. The study results have guiding significance for the development deployment of Jiulongshan gas field.

Key words: tight gas, glutenite reservoir, reservoir evaluation, Zhuzhuchong Formation, Jiulongshan gas field, Sichuan Basin

CLC Number: 

  • TE122.1
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