Weizhou S1-S3 Oilfield Geological Modeling Research

3D geological modeling is the geological, well logging, geophysical data and a variety of interpretation results or conceptual model on the basis of comprehensive analysis, using the computer graphic technology, quantitative randomly generated 3d model.So it is a subject that involved geology, geological modeling data and information analysis, computatinal science and cross, or a integration of various disciplines.That established geological model summarizes all kinds of information, and explanation.So whether they understand the strengths and weaknesses of various input data or information is the key to the reasonable integration of these data.Reservoir generally have multi-scale heterogeneity and continuity, but for various reasons we cannot directly measure to all these details.Geological statistical techniques to generate more real, reservoir heterogeneity on our behalf and continuity of the understanding of the model is a more effective means of research of reservoir.Reservoir modeling method can be divided into two categories, namely the deterministic model and stochastic modeling.Deterministic modeling attempts to start from deterministic data, infer the well establised between the only reservoir characteristics, distribution.But because of data limitations, it is impossible to fully grasp the underground uncertainty information, forecasting process exists strong uncertainty.Therefore, the current widely used stochastic simulation method to establish the model of the reservoir.Stochastic modeling is unknown area between the well by the method of stochastic modeling, set up the optional, high-resolution reservoir geological model.Object of this study showed more uncertainty factors, but due to the limited information, make the most of the known information in the process of modeling, using the random and deterministic method of combining the reservoir 3d geological model is established.Weizhou S1-S3 oil block is located in Wei southwest low,north depressio n,of the southwest of beibu gulf basin.weizhou S1 oilfield research purpose lay er segments include the second section of weizhou group, the third section the first,fourth, seventh, eleventh layer of weizhou group(wellblockl),the first,fourth, fifth,eighth,ninth,tenth layer(wellblock 2).S2oilfield research purpose interval inclu de the thrid section the first, second, third, fourth, fifth, sixth, seventh layer of weizhou group, weizhou S3 oilfield research purpose include the third sections the ninth, tenth layer of Weizhou group,the second sections (wellblock2), the first sections the fifth layer of Liushagang group(wellblock 4).In the process of weizhou oilfield three models, each oilfield has different and difficulty problens. The difficulty of Weizhou oilfield S1 consists in the faults treatment and sedim entary facies simulation model. The difficulty of Weizhou S2 oilfield consists in the relationship between fault cutting processing. The difficulty of Weizhou S3 oilfield consists in data processing, modeling, and attribute modeling of all kin ds of variation function analysis.Aiming at the problems of the three oil fields, combined with the specific situation of the work area, by the mainstream modeling software Petrel oilfield fine geological model is established.First based on fault plane and vertical relationship of identification, the appropriate adjustment and simplification, establish the different fields of fault model can accurately describe the actual fault forms, especially in weizhou oilfield of inter layer fault S1 and can provide a good model for sedimentary facies and attribute structure skeleton;In fine structure framework, under the constraint of by multiple-point geostatistics and assigning more phased modeling method to establish the three fields of phase model better describes the distribution regularity of sedimentary microfacies and lithofacies, the well under the condition of less accurate sand body framework model is established. Specific problems processing method is as follows:Weizhou oilfield oilfield S1 is cut into different small fault blocks, part of the faults section is complex and Warped, simple fault model can not accurately describe fault form;two wellblock is adjacent in plane but vertical differences;To solve these problems, simplify the fault in two sections, cutting transform into connection, the following of the cutting truncated layer transform into the inter layer fault,the method to simplify the fault, resulting in guarantee under the premise of consistent with geological knowledge, to improve the quality of the grid; To simplify the study area into two wellblock model, so that we can describe the characteristics of each work area well.Weizhou S1 oilfield exists single well sedimentary facies datas, also exists in previous studies of sedimentary facies.Two datas is not matched, adopt the method of multistage phased modeling, the result is in line with the previous understanding of sedimentary facies, also can satisfy inoue datas.Weizhou S2 oilfield fault relationship is very complicated, there are 10 faults, including the F3, F5, F6,only the three faults is in south, other faults is north.The 10 faults has three kinds of cutting faults, namely complex multi-stage cutting, a fault cutting multiple fault, a fault by multiple fault cutting. Such cutting relationship is unable to deal with in the process of modeling in Petrel software,because in the process of grid will be wrong.Similar to S1 oilfield fault simplified method, to simplify the fault into several parts. Such results to solve the influence of cutting quality of the grid well.Weizhou S3 oilfield data quality needs to be sorted out and control, the permeability of wellblock 2,to calculation, eliminate outliers, negative, this makes the result more accord with Normal distribution.In the hierarchical data in the process, f that there is sand or mudstone lenticular, to addvirtual Wells, the thickness of virtual Wells is 0, that control the morphology of sand or mudstone lenticular, also the extension of sand or mudstone lenticular is determined.In the process of research S3 oilfield sedimentary facies modeling, it has also three well data sand relatively concentrated, adopting the traditional two point geostatistics method, not drilling simulation result is uncertainty, adopting the multipoint geostatistics Snesim algorithm modeling, Compared with traditional two point sequential gauss method, multipoint statistical simulation results contents inoue data, recreates of forms of the microfacies sandbodies well at the same time, and easy to combine with geologist’s experience,better than the traditional modeling method based on the two point statistics.Other, such as with the little well datas, attribute model is combine with both the phased constraints, analysis of variation function, and also must to combine in the form of seismic wave impedance constraint, the collaborative simulation.Accurate sand body skeleton model combined with wave impedance inversion data volume of reservoir property model to describe the distribution of underground reservoir physical properties, can provide effective for more detailed quantitative characterization of oilfield three-dimensional physical property data.Through fine grid, accurate data, calculate the weizhou oilfield geological reserves of different blocks, S and geological researchers calculated reserves has smaller error, to some extent reflects the accuracy of geological model.Weizhou S1-S3 oilfield was established fine geological model, able to provide fine static data volume for reservoir numerical simulation after the Overall Development Program.