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Electrical Anisotropy Analysis and Calculation of Continental Shale Oil in Cangdong SagChinese Full Text

DING Yujiao;LI Jianing;XIAO Fei;SHAO Yang;LIU Aiping;HOU Lu;Research Institude of Exploration and Development Dagang Oilfield, PetroChina;Faculty of Science, China University of Petroleum(Beijing);Tianjin Branch, China National Logging Corporation;Research Institude of Exploration and DevelopmentDagang Oilfield, PetroChina;

Abstract: In recent years, drilling and completion technology of horizontal well and multistage and cluster large volume fracturing technology have been largely applied in development and utilization in Ek2 formation of continental shale oil in Cangdong sag. Because of the electrical response characteristics of horizontal well are obviously different from those of vertical well, the past application of shale oil logging evaluation technology based on vertical wells is limited. By measuring the resistivity of cubic rock samples in different directions and formation angles, it is found that Ek2 formation of shale oil has very strong electrical anisotropy. Analysis suggests that lamina and interbedded micro-fracture being high growth is the main factor for the strong electrical anisotropy of continental shale oil in Ek2 formation. And lithologic, physical properties and oil-bearing are all affect the strength of electrical anisotropy. The reservoir electrical anisotropy is enhanced with the increase of shale content, ferromagnetic mineral content and oil saturation. The reservoir electrical anisotropy is decreased with the better physical properties. On the basis of the influence of unified laminae and interbedded micro-fracture, a weighted fusion method for calculating electrical anisotropy coefficients is proposed based on lithology, physical properties and oil-bearing. This method provides technical means for resistivity correction of shale oil horizontal wells.
  • DOI:

    10.16489/j.issn.1004-1338.2022.01.008

  • Series:

    (B) Chemistry/ Metallurgy/ Environment/ Mine Industry; (A) Mathematics/ Physics/ Mechanics/ Astronomy

  • Subject:

    Geology; Petroleum, Natural Gas Industry

  • Classification Code:

    P618.13

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