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Mingxi XUE, Kaiyuan CHEN, Zehua TIAN, Shuguang JIA. APPLICATION OF PRESTACK INVERSION METHOD IN THE PREDICTION OF TIGHT SANDSTONE GAS RESERVOIR[J]. Journal of Geomechanics, 2018, 24(1): 42-50. doi: 10.12090/j.issn.1006-6616.2018.24.01.005
Citation: Mingxi XUE, Kaiyuan CHEN, Zehua TIAN, Shuguang JIA. APPLICATION OF PRESTACK INVERSION METHOD IN THE PREDICTION OF TIGHT SANDSTONE GAS RESERVOIR[J]. Journal of Geomechanics, 2018, 24(1): 42-50. doi: 10.12090/j.issn.1006-6616.2018.24.01.005
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APPLICATION OF PRESTACK INVERSION METHOD IN THE PREDICTION OF TIGHT SANDSTONE GAS RESERVOIR

  • 1.

    School of Energy Resources, China University of Geosciences, Beijing 100083, China

  • 2.

    CNPC Xibu Drilling and Logging Engineering Company Limited, Karamay 834000, Xinjiang, China

  • 3.

    Beijing JHND Science and Technology Ltd. Beijing 100085, China

Received Date:  15 September 2017
Revised Date:  04 December 2017
    Abstract
  • Taking A block of eastern Ordos Basin as an example, reservoir petrophysical sensitive parameters are demonstrated though the work of petrophysical analysis which shows that the single impedance parameter can't be applied to identify the reservoir and the parameter Vp/Vs must be used for the identification. Though the analysis of seismic simulation, the seismic resolution and the seismic-response characteristics of different sand thicknesses are studied. Based on the study of seismic simulation, in order to solve the problems of tiny thickness reservoir, rapid lateral variation and reservoir recognition difficulty, the pre-stack geostatistical inversion is chosen as the research method. Comparison of the thickness of well log interpretation and reservoir inversion in 11 wells shows that pre-stack geostatistical inversion can effectively identify reservoir with thickness more than 3m. The results of inversion are considered achieving a high accuracy prediction of reservoir with a thickness average error rate of 7.5%, the average error of five blind wells is 10.2% and the new well is 1.73% which provides a strong reference for well placement.
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