Kekeya Gas Reservoirs River Just West Eight Neogene Geological Modeling Study Group

Oil and gas reservoir modeling is based on comprehensive geological information of the reservoir, taking full advantage of the known point of reservoir information, dissecting oil and gas reservoirs and the internal structure, revealing the distribution rule of oil and gas, and set up the geological model to describe structure, properties, characteristics and distribute oil and gas reservoir.South-western neogene reservoir is low porosity, low permeability and strong heterogeneity.Taking KeKeYa west eight reservoir as the research object, with development geology, sedimentology, logging geology, stochastic simulation theory and other multi-disciplinary theory as a guide, making full use of geological, drilling geology, core observation, logging geology (qualitative and quantitative), multi-disciplinary integrated technology such as computer technology, it carry out strata, sedimentary microfacies, gas and water distribution and reservoir modeling; Application research results based on sedimentary microfacies, Petrel software platform provides river system modeling to build structure modeling, lithology modeling and attribute modeling. Using the logo layer and the same as the similar principle of KeKeYa west eight segments, division stratigraphic into seven small layer and establish west eight period of stratigraphic framework, and analyzes the distribution features of the formation:west eight structure is an asymmetric anticline, slow west and steep east, slow south and steep north.On the basis of core, logging and analysis test data, in combination with regional sedimentary system researching, identify sedimentary facies in the study area;Depending on the type of lithology changes, bedding and their combination, combined with the feature of logging curve, determine the basic types of sedimentary microfacies and microfacies distribution characteristic; Analysis, KeKeYa west eight major develop braided fluvial facies reservoir and it were divided into three microfacies:the river, river sides, interchannel; Based on the stratigraphic and sedimentary facies research, guided by the geostatistics, west eight gas reservoir build3D modeling,3D lithology modeling and property modeling using PETREL2009software; By comparison with indicator sequential and truncated gaussian simulation, it found that sequential indicator simulation method algorithm is stable, and lithologic boundaries is clear, more suitable for regional lithology model; Under the control of lithology model, build the physical parameters of modeling; Using the3D model,carried on the calculation of reserves, the calculation results accords with the traditional displacement method to calculate the results; From three dimensions by geological modeling, shows the distribution characteristic of reservoir physical properties, combined with the saturation of oil and gas layer model, forecasts the west eight segments of each small layer contains the expected.Through the research and application,it determined the basic types of sedimentary microfacies, and simulated the work area facies distribution, and built the porosity, permeability and so on physical parameters modeling, and choosed the adaptive modeling method and test the model, it is important guidance value to understand KeKeYa west eight gas reservoir.