Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 120-131.doi: 10.12108/yxyqc.20210511

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Pore structure characteristics of tight glutenite reservoirs of Baikouquan Formation in Mahu Sag

DU Meng1,2,3, XIANG Yong1, JIA Ninghong2,3, LYU Weifeng2,3, ZHANG Jing4, ZHANG Daiyan4   

  1. 1. College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    3. State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;
    4. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield, Karamay 843000, Xinjiang, China
  • Received:2021-01-11 Revised:2021-04-30 Online:2021-10-01 Published:2021-09-30

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Abstract: The Baikouquan Formation in Mahu Sag is an important oil and gas accumulation area of glutenite. In order to study the pore structure characteristics of tight glutenite reservoir of Baikouquan Formation in Mahu Sag. The analyses of mercury injection, nuclear magnetic resonance and cast thin sections were carried out. Combined with micro-CT scanning technology, quantitative evaluation of minerals by scanning electron microscope(QEMSCAN) and MAPS micro-image splicing technologies, the comprehensive study of microscopic pore structure characteristics from scale and precision, two-dimension and three-dimension were carried out. The results show that:(1) The pore throat scales of tight glutenite reservoirs of Baikouquan Formation in Mahu Sag are widely distributed, showing obvious bimodal characteristics. The large-scale pore throats are submicron to micron scale, while small scale pore throats are nano to submicron scale. The contribution rate of 0.5-4.0 μm throat is the highest, and the contribution rate of micron scale pore throat to seepage is greater.(2) On micron scale, the pore structure has the characteristics of strong heterogeneity and complex mode. The main pore types are dissolution pore, intergranular pore and micro fracture. The distribution states of pores are mainly banded and isolated. The contribution of pore connectivity to seepage is greater than pore scale.(3) On nano scale, scanning electron microscope show that the main mineral components are quartz and feldspar. The compaction between grains is sufficient, and the grain shape is closely combined. The morphology of nano pores in the samples matrix with different porosity and permeability are distinctive, mainly the honeycomb feldspar dissolution pores in mineral grains (crystals) or micropores on the surface of interstitial materials, and the cleavage fracture of calcite particles can be observed, which play a good role in communicating the micro spherical pores and nano dissolved pores. The research results can provide reference for the pore structure characterization and "sweet spot" prediction of tight glutenite reservoirs.

Key words: tight glutenite, complex mode, cross scale, digital core, microscopic pore structure characterization, Baikouquan Formation, Mahu Sag

CLC Number: 

  • TE122
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