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Impacts of Geomechanics on Multi-scale Fracture Network Characterization
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Issues and challenges for development of fractured oil/gas reservoirs involve (1) difficulty in inferring distribution of fractures away from boreholes, while the fractures crossing the boreholes are detectable by borehole measurements, (2) difficulty in distinguishing flowing fractures from non-flowing fractures, (4) the fact of boreholes having almost no productivity unless they are intersecting fractures of large aperture (termed “mega” fracture). To address above challenges, we collected various scales of fracture relating datasets from Yufutsu oil/gas field in Japan and analyzed them to characterize the fracture system. The studies include multi-scale fracture surveys using cores, borehole images, microseismic monitoring, and 3D seismic survey. Those data-sets are analyzed independently and interpreted in the context of stress environment and integrated to characterize field scale fracture distribution. The results showed that impacts of geomechanics are crucial on fractured basement reservoir for an optimal development. The producing fractures confirmed in the production wells show orientations preferential to shear failure. The major fracture systems interpreted from microseismic distribution also have similar orientations and additionally provide us characteristic fracture spacing. The ant-track outputs from 3D seismic survey provide potential sub-seismic faults and can extrapolate the knowledge extracted from microseismic data to all over the field. Though the study, we recognized the importance of the approach that integrates multi-scale data sources and incorporates geomechanics.