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| A study of reef reservoir prediction for Changxing Formation in the Xinglong gas field |
| JIA Yue-Wei, WEI Shui-Jian, YOU Yu-Chun, WANG Dan |
| SINOPEC Petroleum Exploration & Production Research Institute,Beijing 100083,China |
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Abstract In order to solve the difficult problem of reservoir spatial form and favorable prediction of subtle marine reef reservoir in the Changxing Formation of the Xinglong gas field in Sichuan basin,the authors first built the reef seismic forward modeling to reveal the unique seismic response pattern as "up-convex shape,internal event messiness,reflective events increase and frequency decrease". On the basis of the reservoir seismic characteristics,optimization analysis is processed for the multiple seismic attributes, including geometric shape class,wave group statistics class and frequency class.The boundary shape characterization of reef reservoir is studied by multiple attribute clustering.Secondly,neutron pseudo-acoustic curve is selected to constrain model-based iteration inversion method to predict reservoir thickness.The nonlinear equation method is adopted to convert velocity inverse result to porosity of the reservoir.Finally,the storage factor is obtained to explore the optimal matching of reservoir thickness and porosity characteristics.And the reef reservoir spatial distribution features are quantitatively predicted.This prediction method reveals spatial distribution characteristics of reef reservoir,improves prediction accuracy, and provides certain references for reef reservoir prediction research.
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Received: 30 August 2016
Published: 20 August 2017
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