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Journal of Geology & Geophysics
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Research Article

An Efficient Method for Velocity Calibration and Prediction of Microseismic Event Location Using very Fast Simulated Annealing

Jingyi Chen1*, Gaoming Li1, Allyson Gajraj2, Yang Xing2, Yalin Li3, Furong Wu3 and Chen Yin3
1College of Engineering and Natural Sciences, The University of Tulsa, Tulsa, OK 74104, USA
2Sunrise Petro Solutions Tech Inc., Houston, TX 77042, USA
3Geophysical Company of CNPC Chuangqing Drilling Engineering Company Limited, Sichun 610213, P.R. China
*Corresponding Author : Jingyi Chen
Department of Geosciences
The University of Tulsa
800 South Tucker Drive Tulsa
Oklahoma 74104-9700, USA
Tel: 1-(918)631-3014
Fax: 1-(918)631-2091
E-mail: [email protected]
Received April 11, 2014; Accepted May 10, 2014; Published May 28, 2014
Citation: Chen J, Li G, Gajraj A, Xing Y, Li Y, et al. (2014) An Efficient Method for Velocity Calibration and Prediction of Microseismic Event Location Using very Fast Simulated Annealing. J Geol Geosci 3:159. doi:10.4172/2329-6755.1000159
Copyright: © 2014 Chen J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Velocity calibration and estimation of microseismic event location are two important ingredients in microseismic monitoring. It is generally considered that the accurate estimation of microseismic event location depends on the accurate velocity structure. In this paper, very fast simulated annealing (VFSA) is first applied to invert velocity structure between the treatments well and the monitoring well by using perforation shot travel time data, and then is implemented to locate the microseismic events using the velocity structure obtained above. Unlike previous applications of VFSA using the objective function of misfit between the theoretical travel time and the observed travel time, we propose a novel objective function for VFSA which consists of the travel time differences of P-wave first arrivals between seismic traces. The P-wave first arrival travel time is calculated by means of a shooting ray tracing method. To illustrate the efficiency of the proposed method, a flat-layered model test is performed by considering the uncertainty of travel time picking. The numerical results indicate that the predicted microseismic event locations have a good match with the true values although the inverted velocity structure is not so accurate.

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