Determination of inter-well connectivity of fractured fractures in glutenite reservoirs by microseismic monitoring results:a case study of Mahu Oilfield in the Junggar Basin
LIU Weidong1, LIU Tengjiao2, JI Yongjun1, ZHANG Lifeng1, CHU Fangdong2, ZHANG Long1
1. Development Company, Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang 834000, China; 2. New Resources Geophysical Exploration Division, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：At present, the fracture morphology characterized by discrete microseismic event locations only represents the envelope range of fractured fracture networks, and thus it is difficult to accurately characterize the actual artificial fracture morphology in the envelope of fracture networks. Moreover, due to the influence of factors such as the velocity model and first break picking, there is a certain error in the location results of microseismic events, and thus the inter-well connectivity of fractures cannot be determined only by the locations of discrete microseismic events. Therefore, the tracer detection results of the demonstration area Ma 131 in Mahu Oilfield of the Junggar Basin were taken as the basis to determine whether the artificially stimulated fractures between wells were connected. In addition, this paper summarized the rule of the minimum distance between microseismic event locations and adjacent well event locations without the influence of natural fractures and forms a new method to quantitatively evaluate the inter-well connectivity of fractured fractures in glutenite reservoirs. In the Mahu glutenite reservoir, without the influence of natural fractures, microseismic events of adjacent wells cross, and the minimum distance between a microseismic event and an adjacent well event is less than 10 m, which indicates that the fracturing fractures between two wells are connected; otherwise, the minimum distance between a microseismic event and an adjacent well event is more than 10 m, which shows that the fractured fractures between two wells are not connected. The proposed method can evaluate the rationality of well spacing and construction scale and can also be extended to other areas.
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LIU Weidong, LIU Tengjiao, JI Yongjun, ZHANG Lifeng, CHU Fangdong, ZHANG Long. Determination of inter-well connectivity of fractured fractures in glutenite reservoirs by microseismic monitoring results:a case study of Mahu Oilfield in the Junggar Basin. Oil Geophysical Prospecting, 2022, 57(2): 395-404.
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