Oil & Gas Geology ›› 2020, Vol. 41 ›› Issue (1): 26-36, 49.doi: 10.11743/ogg20200103

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Characteristics of and main factors controlling the dolomite reservoir of Gaoyuzhuang-Wumishan Formations in the Jixian System, the north of North China

Pengwei Li1(), Zhiliang He2,*(), Ping Luo3, Tingfu Jin4, Ying Zhang1, Jianyun Feng1, Jinmin Song4, Shilin Xu1   

  1. 1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
    2. China Petroleum & Chemical Corporation, Beijing 100728, China
    3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    4. College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Received:2019-07-22 Online:2020-02-01 Published:2020-01-19
  • Contact: Zhiliang He E-mail:lipw.syky@sinopec.com;hezl.syky@sinopec.com
  • Supported by:
    国家自然科学基金项目(U1663209);国家科技重点专项(2017ZX05005-002-009);中国科学院A类战略性先导项目(XDA14010201)

Abstract:

The dolomite reservoirs of Gaoyuzhuang-Wumishan Formations in North China are characterized by strong variety in reservoir rock types and pore space types, which are controlled by complex factors and caused strong heterogeneity in reservoir quality. They in turn seriously hinders the exploration and development of oil-gas and geothermal resources in this area. The study comprehensively analyzes and summarizes the characteristics of dolomite reservoirsand main factors controlling the formation of high-quality reservoirs in this area. Observations and studies are carried out on both outcrops and cores through large number of field geological surveys and core observation, thin section identification and physical property analyses. The results show that the reservoirs dominated by microbiological dolomites with complex textures and structures were developed herein, among which the coniform stromatolites and thrombolites are the most favorable rocks for reservoir. According to the pattern of reservoir space assemblages, the reservoirs could be categorized into 3 types:composite pore-cavity-fissure reservoir, fissure-pore reservoir and pore reservoir. Among them, the Wumishan Formation in the Jixian System are dominated by the composite pore-cavity-fissure type, relatively better in physical property. Whereas the Gaoyuzhuang Formation are of typical fissure-pore and pore types, relatively poorer in reservoir property. In conclusion, multiple factors contribute to the formation of large-scale high-quality dolomite reservoirs in the study area, with the microbiological reef-shoal facies, as well as the Indosinian tectonic uplifting, fracturing and dissolution, as the main factors leading to better reservoir quality.

Key words: microbialite, dolomite reservoir, Gaoyuzhuang Formation, Wumishan Formation, Jixian System, the north of North China

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