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Geoscience ›› 2021, Vol. 35 ›› Issue (06): 1844-1853.DOI: 10.19657/j.geoscience.1000-8527.2021.196

• Petroleum Geology • Previous Articles     Next Articles

Evaluation and Characteristics of Pore Structures in Sand and Conglomerate Reservoirs of Badaowan Formation in the AH5 Well Block

LIU Wenfeng1(), ZHANG Xiaoshuan1, LIU Jinming1, AILIMAN·Daoerji 1, YANG Yuanfeng1, ZHANG Xiwen1, QI Liqi2, YU Jingwei2()   

  1. 1. The Baikouquan Oil Production Plant of Xinjiang Oilfield Company, Karamay,Xinjiang 834000, China
    2. China University of Petroleum (Beijing) at Karamay, Karamay,Xinjiang 834000, China
  • Received:2021-03-17 Revised:2021-06-18 Online:2021-12-10 Published:2022-02-14
  • Contact: YU Jingwei

Abstract:

The Jurassic Badaowan Formation hosts low-porosity and low-permeability reservoirs with low oil saturation in Block AH of the Junggar Basin. Pore structure of the oil reservoirs is poorly understood, which hampers reservoir deliverability evaluation. Core investigation, common, fluorescence and cast sections, SEM, high-pressure mercury intrusion, oil-water saturation of core and phase permeability experiments were integrated to quantitatively characterize and classify pore structures, and analyze the relative permeability characteristics. The results show that the reservoirs can be divided into sand and conglomerate reservoirs, and the pore structures comprise residual intergranular pores, intergranular/intragranular dissolved pores, mold pores, micro-fractures and intercrystalline pores. Throat types comprise scaled down version pores, necked pores, flake, curved and tube bundle throats. On the basis of oil-water saturation experiments and basic parameters for mercury injection, pore structures of the sand and conglomerate reservoirs are divided into three types, and the production capacity of conglomerate reservoirs is higher than that of sand reservoirs.

Key words: pore structure, quantitative characterization, classification, Badaowan Formation, AH5 well block

CLC Number: