Reservior Geological Modeling On Shan 1 Reservior,A Zone In Sulige Gasfield

Zone A of sulige gas field is located in the middle and northern part of yishan slope in ordos basin.The overall structure is a gentle west-dipping monocline.Currently,150 wells have been drilled and developed.Although the sand body of underground reservoir is very developed,But effective sandstone is not very well developed,the reservoir is highly heterogeneous,the effective sandstone distribution area,thickness and connectivity relationship is unclear,It is difficult to predict interwell sand body and effective reservoir,reservoir characteristics and prediction research should be carried out systematically and carefully to provide reliable basis for further development of the research area.Aiming at these problems,This study is guided by high resolution sequence stratigraphy,sedimentology theory and 3d geological modeling theory,building based on depositional cycle of fine stratigraphic division and contrast,and then determine the types of sedimentary facies and microfacies in the study area,to set up the log facies~microfacies model,draw the plane exhibition layout,sedimentary microfacies model of regional tectonic and sedimentary facies model and reservoir attribute model,to predict the space distribution of reservoir parameters.It mainly completes the division and contrast of the single-stage fluvial cycle sequences and establishes the high-resolution sequence stratigraphic framework of the single-stage sand body.Through core observation and sedimentary background analysis of the coring well,the study area was determined to be meandering river sediments,and further subdivided into 12 types of sedimentary microfacies,and the corresponding logging microfacies model was established.Applied in the 3D geological modeling geologic modeling software Petrel,district six depositional time unit of the structure model is established,according to the reservoir information collected in the study area,"sequential indicator simulation under phase control condition" technology,which combines deterministic and stochastic modeling,is adopted to complete the establishment of sedimentary facies models of 6 depositional time units.Through random modeling theory and variable-function model theory,reservoir physical property parameters such as porosity,permeability and saturation interpreted by logging are simulated into three-dimensional mesh,and reservoir physical property model is established under phase-controlled conditions.On the basis of completing the fine reservoir attribute model,the geological reserves of the model are calculated by volume method.Finally,the reliability of 3d geological model is analyzed by means of various quality control methods.The geological model established in this study conforms to the geological understanding of the study area,and accurately delineates the heterogeneity of underground reservoirs and reveals the distribution law of oil and gas,which can provide certain guidance for making reasonable development plans of oil and gas fields.