3D geological modeling of strongly heterogeneous dual-medium deep carbonate reservoirs:A case study of Feixianguan-Changxing Formations in Puguang Gas Field
The carbonate reservoir in Puguang Gas Field has the characteristics of large burial depth,developed reef-flat facies,poor matrix properties,widespread development of natural fractures,and strong heterogeneity.The challenge is to construct three-dimensional geological modeling of such strongly heterogeneous dual-medium reservoirs.We divided the reservoir modeling object into two major media:matrix and fracture.Based on single well interpretation data and seismic wave impedance data,the matrix model was established by using well-seismic combination,step-by-step facies control,and multi-trend fusion probability constraint volume construction.According to the idea of multi-scale and multi-stage modeling,the entropy weight method combined with ex-pert experience evaluation was used to construct the spatial distribution constraint volume of fracture through the integration of mechanism-geology-seismic data,as well as tectonic stress fields,distances to the fault,and seismic sensitive attributes of frac-tures.Under the constraints of the constraint volume,the fracture model was constructed by the discrete fracture network modeling.The numerical simulation of the gas reservoir was conducted on the established matrix-fracture model.The historical fitting rate of each well reaches 90%,and the fitting error is controlled within 20%,indicating a high fitting accuracy of the model.
deep carbonate reservoirstrong heterogeneitymulti-trend fusion probability volumedual-medium3D geological modeling
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