Asymmetry analysis of microseismic monitoring results of horizontal well fracturing
DONG Wenbo1,2,3, GUI Zhixian1,2, WANG Ya'nan4, ZHANG Hepai5, JIN Pengfei6
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China; 2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China; 3. Exploration and Development Research Institute, Liaohe Oilfield Company, PetroChina, Panjin, Liaoning 124010; 4. BGP Geological Research Center, CNPC, Zhuozhou, Hebei 072750, China; 5. BGP Equipment, CNPC, Zhuozhou, Hebei 072750, China; 6. New Resources Geophysical Exploration Division, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：To analyze the asymmetry of microseismic monitoring results of horizontal well fracturing and provide a basis for objectively evaluating the fracturing effect，this paper analyzes the microseismic monitoring results of 54 horizontal wells fracturing by combining fine geological research and engineering design. Data applied in this study include microseismic monitoring data，3D seismic data，logging data，and fracturing data. The paper summarizes the factors leading to the asymmetry of microseismic monitoring results of horizontal well fracturing and achieves the following findings. ①The factors leading to the asymmetry of microseismic monitoring results of horizontal well fracturing mainly include engineering reasons，geological reasons，and completed well distribution. The geological reasons include natural fractures，faults，lithologic changes，and crustal stress. ②Natural fractures and completed wells within the range of the fracture lengths can induce artificial fractures to change their directions. The artificial fractures will extend along the fracture development area and around completed wells. This leads to the asymmetric distribution of microseismic events on both sides of horizontal wells. ③Fault has two functions of inducing and shielding artificial fractures. The artificial fractures extend along the fault，and the microseismic monitoring events are distributed in a plane. The artificial fractures cannot extend to the other side of the fault and form a unilateral distribution far away from horizontal wells. ④The lithologic changes of vertical interlayers and in the horizontal direction control and block the extension of artificial fractures. They can inhibit the extension of artificial fractures to a great extent or even make fractures fail to form, which results in the asymmetry of microseismic events in the horizontal and vertical directions. ⑤There is an angle between microseismic events and the horizontal section when the horizontal well is not perpendicular to the direction of the maximum principal stress. This forms the angular asymmetry of microseismic events.
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