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Combined technology of PCP and nano-CT quantitative characterization of dense oil reservoir pore throat characteristics

  • Hao ZhangEmail author
  • Yushuang Zhu
  • Ningyong Ma
  • Chuangfei Zhou
  • Yongchao Dang
  • Fei Shao
  • Jun Jiao
  • Li Li
  • Hengli Wang
  • Ming Li
Original Paper
  • 15 Downloads

Abstract

The size of pore throats in tight oil reservoirs varies from a few tens of nanometers to several hundred micrometers. This complex and diverse microscopic pore throat structure restricts the exploration and development process, affecting the recovery rate. Size, shape, and spatial distribution of pore throats in tight oil reservoirs are revealed in this paper via a scanning electron microscope (SEM), casting thin-sections, high-pressure mercury injection, and Nano-CT. Results show that the pore type of the Chang 7 tight oil reservoir in the Xin’anbian area is mainly divided into three categories: intergranular pores, dissolution pores, and microfractures. Numerous nanoscale pore throats have developed in this area, which greatly contributes to reservoir capacity and seepage. Pore throat distribution on capillary pressure curves of different samples shows that when the threshold pressure is less than 1 Mpa, there are many micron-sized pores with good connectivity and pore throats form a large tubular shape with a throat radius between 3.6 and 1064 nm. When the threshold pressure ranges from 1 to 3 MPa, there are many nanoscale pores with good local connectivity, intragranular dissolution pores develop, and pore throats are in tube bundles and spherical in shape with the throat radius between 3.6−657 nm. When the threshold pressure is greater than 3 MPa, nanoscale microfractures develop and are connected to neighboring small spherical pores, small spherical nanopore spaces become isolated, vertical connectivity is poor, and the throat radius is between 3.6−242 nm.

Keywords

Tight reservoir Microscopic pore throat structure Mercury injection Nano-CT Ordos Basin 

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Hao Zhang
    • 1
    • 2
    Email author
  • Yushuang Zhu
    • 1
  • Ningyong Ma
    • 3
  • Chuangfei Zhou
    • 4
  • Yongchao Dang
    • 5
  • Fei Shao
    • 5
  • Jun Jiao
    • 6
  • Li Li
    • 5
  • Hengli Wang
    • 1
    • 7
  • Ming Li
    • 1
  1. 1.State Key Laboratory of Continental Dynamics/Department of GeologyNorthwest UniversityXi’anPeople’s Republic of China
  2. 2.Xi’an Shiyou UniversityXi’anPeople’s Republic of China
  3. 3.The 3rd Oil Production Factory, Changqing Oilfield Branch Company, Petro ChinaYan’anPeople’s Republic of China
  4. 4.The 6th Oil Production Factory, Changqing Oilfield Branch Company, Petro ChinaYan’anPeople’s Republic of China
  5. 5.The 1st Oil Production Factory,Changqing Oilfield Branch Company, Petro ChinaYan’anPeople’s Republic of China
  6. 6.Research Institute of Exploration and Development of Changqing Oilfield CompanyXi’anPeople’s Republic of China
  7. 7.Nanchong Professional Technical CollegeNanchongPeople’s Republic of China

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