| In this paper, the study area is located in the well-Su14area of the Sulige Gas Field which belongs to the ordos basin, select the1st member of Shanxi formation and the8th member of Xiashihezi formation as the research object, to serve in the area of oil and gas exploration and development as the goal, the comprehensive use of sedimentology, petroleum geology, high-resolution sequence stratigraphy and geostatistics theory as the instruction, take full advantage of well logging, core observation and outcrop section, and other informations, refer to the previous research results, the objective interval in the studied area of sedimentary facies, sand body distribution, reservoir modeling and so on were studied. On the basis of high resolution sequence stratigraphic classification, combining with the depositional system and sedimentary facies research, the application of reservoir modeling, provided petrel software to complete the study area reservoir3d geological modeling. Achievements known as follows:(1)Guided by the basic theory of high-resolution sequence stratigraphy, combining with the existing stratigraphic classification scheme, according to the curve combination characteristic, based on the cycle of comparative law, the1st member of Shanxi formation-the8th member of Xiashihezi formation are fine divided into19small layers (short-term cycle), and compared within the hole district, laid the foundation for subsequent research work.(2)Based on drilling core data and logging data in the study area, detailed observation and comprehensive analysis of outcrop section, on the basis of rock association, sedimentary structure, profile structure and evolution sequence, refer to predecessors’studying results, carried out a series of studies about sedimentary facies of the1st member of Shanxi formation and the8th member of Xiashihezi formation, from the piont of the relationship betweet accommodation and sedimentary type, set up a sedimentary model of braided river under different accommodation, not only for reservoir prediction and well placement in the process of gas field development has important guiding significance, but also for rich and explore braided river sedimentary microfacies and sedimentary model also has important reference value.(3)In different layers, there are different sand body from different origins, these sand body have different distribution characteristics. On the basis of the research of sedimentary facies, this paper discusses the different interval and can accommodate space under the condition of sedimentary sand body structure form, the change of spatial distribution characteristics.(4)Three-dimensional geological modeling from the Angle of the three-dimensional study of formation, is the multi-disciplinary comprehensive unification, but also a basis for large comprehensive geological research, in view of the study area reservoir density, the characteristics of strong heterogeneity, petrel application software for reservoir modeling research, to overcome the general research using two-dimensional map to describe the limitations of3d reservoir. This model by combining the deterministic model and stochastic model of "phase" constraint modeling method, under the constraints of the sedimentary facies model control, loyal to the well point data, and optimization of stochastic simulation algorithm, implements the reservoir physical property parameter modeling, in the late stage of evaluation test model, the model shows high reliability and provides a solid foundation for later numerical simulation.Through the research and application of the above methods, the formation of the fine contrast, determine the basic types and characteristics of the sedimentary facies, find out the rules of sand body distribution, reservoir3D geological model is established, and an objective reflection of the real situation of underground, for the gas capacity in a construction provides a powerful guarantee. |
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