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Velocity Modeling and Inversion Techniques for Locating Microseismic Events in Unconventional Reservoirs 被引量:7

Velocity Modeling and Inversion Techniques for Locating Microseismic Events in Unconventional Reservoirs
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摘要 A velocity model is an important factor influencing microseismic event locations. We re- view the velocity modeling and inversion techniques for locating microseismic events in exploration for unconventional oil and gas reservoirs. We first describe the geological and geophysical characteristics of reservoir formations related to hydraulic fracturing in heterogeneity, anisotropy, and variability, then discuss the influences of velocity estimation, anisotropy model, and their time-lapse changes on the accuracy in determining microseismic event locations, and then survey some typical methods for building velocity models in locating event locations. We conclude that the three tangled physical attributes of reservoirs make microseismic monitoring very challenging. The uncertainties in velocity model and ignoring its anisotropies and its variations in hydraulic fracturing can cause systematic mislocations of microseismie events which are unacceptable in microseismic monitoring. So, we propose some potential ways for building accurate velocity models. A velocity model is an important factor influencing microseismic event locations. We re- view the velocity modeling and inversion techniques for locating microseismic events in exploration for unconventional oil and gas reservoirs. We first describe the geological and geophysical characteristics of reservoir formations related to hydraulic fracturing in heterogeneity, anisotropy, and variability, then discuss the influences of velocity estimation, anisotropy model, and their time-lapse changes on the accuracy in determining microseismic event locations, and then survey some typical methods for building velocity models in locating event locations. We conclude that the three tangled physical attributes of reservoirs make microseismic monitoring very challenging. The uncertainties in velocity model and ignoring its anisotropies and its variations in hydraulic fracturing can cause systematic mislocations of microseismie events which are unacceptable in microseismic monitoring. So, we propose some potential ways for building accurate velocity models.
出处 《Journal of Earth Science》 SCIE CAS CSCD 2015年第4期495-501,共7页 地球科学学刊(英文版)
基金 supported by the Specialized Research Fund for the Doctoral Program of Higher Education (No.20130132110023) by the National Natural Science Foundation of China (Nos.41230318,41074077)
关键词 microseismic location velocity model building velocity error ANISOTROPY unconventional reservoir. microseismic location, velocity model building, velocity error, anisotropy, unconventional reservoir.
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