Research On Geological Modeling And Remaining Oil Distribution Of Block Wei22 In Weicheng Oil Field

Considering the geological characteristics and development of thick and heterogeneous block reservoir of Wei22 in Weicheng oil field, applying exploration and development data, guided by the theory of petroleum geology, sedimentology, reservoir geology and development geology, adopting the technical means of high-resolution sequence stratigraphy, reservoir 3D modeling, reservoir evaluation and reservoir numerical simulation, fine description and distribution of the remaining oil of block reservoir of Wei22 in Weicheng oil-field have been studied.Based on the research of the tectonic formation and evolution, applying computer and 3D visual modeling technology, the fine structural of block reservoir of Wei22 has been studied. According to present reservoir sectional drawing and a large-scale, small gap contour micro tectonic graph in this paper, the minor fault growing distribution and low-amplitude micro tectonic are discussed and recognized. Applying high resolution sequence stratigraphy, the high resolution sequence stratigraphy hack is concluded. Comparing the framework profile, block reservoir of Wei22 is divided into 2 long-term,4 medium-term cycles and 10 short-term cycles. This is very helpful for fine reservoir description. Analyzing the background and characteristics of sedimentary and core, the microfacies of the formation is studied. The conclusion is that this area is at the frontal delta zone, microfacies are mainly distributary channel, mouth bar, inter-channels, sand sheet, offshore bar sand and shallow-lake facies. The main reservoir sand is the sand of river and mouth bar, and the rest is sand sheet. According to the compositive valuation of reservoir quality, block reservoir of Wei22 is a strongly heterogeneity and low permeability reservoir. The porosity and permeability are mainly controlled by the depositional microfacies. The intrastratal anisotropy and interformational anisotropy are serious, which is the main task for development.Adopting multi-information cooperation and stochastic modeling method, the 3D reservoir models are built up. Based on the distribution of the depositional microfacies and the sequential indicator simulation, the depositional microfacies model is built up. Utilizing the facies-controlled and sequential Gauss simulation method, the attribute parameter model is built up. At last, the original geological reserves are calculated. Calculating the geology reserves, the single layer is evaluated on reserves and the quality and semi-quantity research on macro remaining oil is discussed. On the research of macro and micro remaining oil, the reservoir numerical simulation, quantitative research and distribution of remaining oil are discussed, the further development is proposed. This research suggested that the movable oil high value region exists generally in the sand pinchout area, the well pattern imperfect area and constructs the high spot, and mostly assumes the dispersion shape, laminated, the continual shape distribution.