Study On Reservoir Geological Modeling Of Moliqing Oil Field

Most oil fields in China today have been in the mid-later stage of development programming,research of reservoir requires much higher quantitative,the description of reservoir requires more fine,so it's very important to establish high-precision 3D reservoir geological model.This paper focuses on building the fine geological model,based on the geological features of Moliqing oil field S2 IV sand group,integrated kinds of geological,well logging and geophysical data,used the theories and methods of multidisciplinary as guidance,used the double constraint conditions of isochronous stratigraphic framework and sedimentary facies and tochastic simulation method,established a high-precision 3D geological model of the region.Mainly some of the following research:1.High-resolution sequence stratigraphy interpretation of the region is carried on,and under the control of sequence framework,the thin layer division and contrast of 179 wells of the region are finished.S2 IV sand group can be divided into 5 thin layers,corresponding SQ3 sequence.2.Based on core observation of the area and neighboring wells,combined with the regional geological features,through the analysis of core facies and logging facies,and according to lithology of the core,sedimentary structures,sedimentary sequences and the features of well logge curves,the conclusions are that south of the study region mainly develops fan delta sedimentary system,and north mainly develops subaqueous fan sedimentary system.In the region mainly develops four microfacies subaqueous distributary channel,interdistributary bay,sheet sand and lacustrine mud.3.Apply the latest log interpretation of porosity,permeability and shale content data,three-dimensional geological model of the Moliqing oil field S2 IV sand group is established.We use sequential indicator simulation method to establish the the oil field reservoir facies Moliqing model.Under dual control of sequence stratigraphic framework and sedimentary microfacies,using sequential Gaussian simulation method,Moliqing oil field reservoir properties model is established.According to well log interpretation model and the standard of effective thickness,the net-to-gross ratio model of the reservoir is computed.And based on the grid of the model,the oil and gas originally in-place is calculated,which is in good agreement with that calculated by volume method.4.We validate the model established and analyze the accuracy of it,using the probability distribution of consistency,geological conceptual model of consistency and geological dynamic verification to verify the model,the verification results show that the model has a certain degree of accuracy.