Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (2): 78-89.doi: 10.12108/yxyqc.20200208

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Distribution and evaluation of underwater distributary channel sandstone reservoir based on well-seismic combination: a case study of JP35 sand group in Shifang gas reservoir

LI Hongtao, MA Liyuan, SHI Yunqing, HU Xiangyang, GAO Jun, LI Hao   

  1. Key Laboratory for Marine oil and Gas Exploitation, Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
  • Received:2019-07-08 Revised:2019-10-09 Online:2020-03-21 Published:2020-01-19

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Abstract: In order to evaluate the potential and optimize favorable zones of gas reservoir of the third member of Penglaizhen Formation in Shifang area, western Sichuan,joint calibration method of core data,log data and seismic data were used to analyze the sedimentary facies,reservoir characteristics and favorable gas-bearing reservoir distribution of the gas reservoir and JP35 sand group. The results show that the gas reservoir can be further divided into five sand groups,and the thickness of each sand group is stable. The tectonic setting was stable and the strata were gentle during the sedimentary period. The sediment belongs to shallow-water river-controlling delta front, and the underwater distributary channel is the most favorable sedimentary microfacies. The reservoir rock of JP35 sand group is dominated by of medium-low porosity and ultra-low permeability dissolved fine-grained lithic sandstone,with poor seepage capacity,which is an important factor affecting reservoir quality evaluation. The comprehensive analysis results of reservoir distribution and gas-bearing property based on well-seismic combination show that,compared with the distribution of underwater distributary channel sand bodies,the distribution range of high-quality effective gas-bearing reservoirs is relatively limited with the characteristics of discontinuous bands,and its distribution is controlled by sedimentary microfacies,distributary channel scale and local high part of the structure. This method and research results can provide reference for analyses of sedimentary facies, reservoir characteristics,distribution and evaluation of the study area and similar areas,as well as the optimization of favorable zones.

Key words: reservoir characteristics, well-seismic combination, reservoir distribution and evaluation, sedimentary characteristics, Shifang gas reservoir

CLC Number: 

  • P618.13
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