A Study Of Microfacies-controlled Modeling In A Complex Fault-block Reservoir

This paper analyses underwater fan body facies-controlled reservoir petrophysical parameters modeling method, and application for the complex fault-block reservoirs All in A'Nan Oilfield, Erlian Basin. The fault-block All in A'Nan Oilfield is now at a high water-cut stage, and its reservoir heterogeneity has severely affected development results.In order to accurately describe the reservoir and its characteristics, this paper establishes a structural model, a sedimentary microfacies model and a microfacies-controlled petrophysical model, step by step. Using a facies-controlled modeling technology with multiple stochastic modeling methods, and on the basis of results on seismic, logging, geology and development performance. The correlation of analogy results between facies-controlled petrophysical parameters and direct petrophysical parameters reveals that the facies-controlled attribute model is more reliable in describing reservoir heterogeneity. It consists of integrated Petrel geological modeling and Eclipse numerical simulating, so synthetical methods have been adopt, this enhancing oil and gas recovery efficiency. It shows that the facies-controlled modeling technology can satisfactorily show the petrophysical parameters of reservoirs with variable sedimentary microfacies and severe heterogeneity, this providing a dependable geological basis for the later development adjustment of oil and gas fields. At the same time, applicability of facies-controlled modeling to all kinds of sediment environment is summarized in complex fault-block reservoirs, and recommended for similar application around Bohai Bay.