Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 27-33.doi: 10.3969/j.issn.1673-8926.2017.03.004

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Characteristics and formation mechanism of dissolved pores in tight oil reservoirs of Lucaogou Formation in Jimsar Sag

YAN Lin1, RAN Qiquan1, GAO Yang2, CHEN Fuli1, WANG Shaojun1, LI Chongfei1   

  1. 1. Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2016-10-10 Revised:2016-12-03 Online:2017-05-21 Published:2017-05-21

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Abstract: Dissolved pores are well developed in tight oil reservoirs of Lucaogou Formation in Jimsar Sag, however, its controlling factors and formation mechanism are unclear. Combined with analyses of reservoir mineral composition, hydrocarbon accumulation evolution and diagenetic evolution, the data of cores, thin section, scanning electronic microscope and physical property test were used to study the pore types and characteristics, the genetic mechanism and distribution of dissolved pores of Lucaogou Formation. The results show that dissolved pores developed in terrigenous clastic rocks, endogenetic sedimentary rocks and volcanic clastic rocks, and the formation of the dissolved pores is influenced by internal and external factors. The soluble minerals such as feldspar and carbonate rocks dissolved by organic acid are the main formation way of the dissolved pores. The detritus feldspar fine sandstone reservoir in the middle of the second member of Lucaogou Formation, with well developed dissolved pores, good physical properties, large vertical thickness and stable plane distribution, is an important zone for the next tight oil exploration and development.

CLC Number: 

  • TE122.2
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