Lithologic Reservoirs

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Study on the potential tapping and adjusting of ultra-low permeability reservoir in Wei 42 block

DONG Fengling1, ZHOU Huadong1, LI Zhixuan1, CHEN Yingying1, BI Yushuai1, WANG Lei2   

  1. 1. No. 2 Oil Production Plant, Zhongyuan Oilfield Company, Sinopec, Fanxian 457532, China; 2. No. 3 Oil Production Plant,Zhongyuan Oilfield Company, Sinopec, Shenxian 252429, China
  • Online:2013-09-26 Published:2013-09-26

Abstract:

The reservoir in Wei 42 block of PuchengOilfield was characterized by deep burial, poor physical properties, unclear sedimentary environment and sand body connectivity, strong heterogeneity, difficult water injection, imperfect well spacing and lowefficient development. Based on fine reservoir description and performance analysis of production, this paper studied the types and distribution of remaining oil. The remaining oil types were classified into interlayer interference type, structural high part type, imperfect injection-production type and lenticular sand body type. Aimed at the geological characteristics of reservoir and different types of remaining oil, manymeasures were carried out, such as enlargement adjustment, regrouping of layers, and adjustment of injection-production well spacing and well spacing density. The application result shows that well pattern optimization and well pattern thickening for different types of remaining oil distribution improved the development effect.

Key words: reservoir characteristics, secondary pore, comprehensive evaluation, deep reservoir, the third member of Shahejie Formation, Qikou Sag

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