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3D numerical simulation of heterogeneous in situ stress field in low-permeability reservoirs
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3D numerical simulation of heterogeneous in situ stress field in low-permeability reservoirs
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3D numerical simulation of heterogeneous in situ stress field in low-permeability reservoirs
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Journal Article
3D numerical simulation of heterogeneous in situ stress field in low-permeability reservoirs
2019
Overview
Analysis of the in situ stress orientation and magnitude in the No. 4 Structure of Nanpu Sag was performed on the basis of data obtained from borehole breakout and acoustic emission measurements. On the basis of mechanical experiments, logging interpretation, and seismic data, a 3D geological model and heterogeneous rock mechanics field of the reservoir were constructed. Finite element simulation techniques were then used for the detailed prediction of the 3D stress field. The results indicated that the maximum horizontal stress orientation in the study area was generally NEE–SWW trending, with significant changes in the in situ stress orientation within and between fault blocks. Along surfaces and profiles, stress magnitudes were discrete and the in situ stress belonged to the Ia-type. Observed inter-strata differences were characterized as five different types of in situ stress profile. Faults were the most important factor causing large distributional differences in the stress field of reservoirs within the complex fault blocks. The next important influence on the stress field was the reservoir’s rock mechanics parameters, which impacted on the magnitudes of in situ stress magnitudes. This technique provided a theoretical basis for more efficient exploration and development of low-permeability reservoirs within complex fault blocks.
Publisher
China University of Petroleum (Beijing),KeAi Publishing Communications Ltd,KeAi Communications Co., Ltd
