Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 145-155.doi: 10.12108/yxyqc.20210615

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Dolomitic reservoir prediction technology based on OVT domain migration data and its application: A case study of Feng 3 member in Wuxia area,Mahu Sag

CHEN Yongbo1, ZHANG Huquan1, ZHANG Han1, ZENG Huahui1, WANG Bin1, WANG Hongqiu1, XU Duonian1, MA Yongping1, ZONG Zhaoyun2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    2. School of Geoscience, China University of Petroleum(East China), Qingdao 266555, Shandong, China
  • Received:2021-01-25 Revised:2021-06-18 Online:2021-12-01 Published:2021-11-25

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Abstract: The lacustrine dolomitic reservoir “sweet spots” of Feng 3 member of Permian Fengcheng Formation in Wuxia area have the characteristics of single thin layer, rapid lateral change and small impedance differences from surrounding rocks, so it is difficult to predict the “sweet spots” reservoir by using conventional 3D seismic data. Based on the analysis of main controlling factors of oil enrichment in the dolomitic reservoir “sweet spots” in high yield wells, it is found that the “sweet spots” are mostly in places where the reservoirs have large thickness, high brittleness(fractures) and high pressure. Based on the main controlling factors of oil accumulation, trace gather dynamic analysis and stacking method based on offset-azimuth stacking template under geologic target was worked out to get prestack seismic data of different azimuths to predict the thickness of dolomitic reservoir. On the basis of elastic parameter cross-plot analysis template, Young's modulus(E) and Poisson's ratio(σ) were used to predict the brittle part of dolomitic reservoir in the slope area. Based on wave equation, Hooke's law and elastic parameter, the relationships of effective stress with P-wave and S-wave velocity were derived, and a formation pressure prediction method combining Young's modulus(E) and volume modulus(K) was developed to predict the area with abnormal pressure to enhance the prediction accuracy of “sweet spots”. After the application of this result, three wells have obtained high yield oil flows in Feng 3 member, and hundred million tons geologic oil reserves are evaluated.

Key words: OVT-domain, dolomitic reservoir, brittleness from pre-stack inversion, prediction of abnormal pressure, Fengcheng Formation, Mahu Sag

CLC Number: 

  • P631.4
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