Three-dimensional Geological Modeling And Potential Analysis Of Dupo Area

Dupo oilfield tectonic position is located in the southern of Gucheng oilfield in Biyang Depression.Oil-bearing horizon in the area of the Paleogene Hetaoyuan formation Nuclear three sections No.2to No.7oil groups.Affected by tectonic acticity, lateral variation in reservoir, well developed fracture.The presence of oil and gas exploration in the area to implement structural shapes is unclear and difficult to predict the distribution of reservoir plane problems.This paper takes No.2to No.7oil groups44small layers as the research object, integrated use of structural geology, petroleum geology, log interpretation, seismic exploration and other theoretical approaches, starting from stratigraphic correlation, further studying the Dupo region of stratum structure, sedimentary characteristics, reservoir heterogeneity,etc,and built up a three-dimensional geological model, eventually carried out reservoir evaluation, put forward the favorable regionsWith the combination of earthquake and log information, using Marker layer method to recognize six marker bed Within the scope of work area. Under the constraint of marker bed, subdivide line of oils in interior small layer to establish high-resolution stratigraphy framework. Well seismic combination indicates that Nuclear three sections No.2to No.7oil formation in Du Po region is relatively developed, as a whole, the Northwest District is high while the Southeast District is low, with wide delay nearly east-west nose-like structure, and fault are mainly NNE. With the combination of core analysis, the well logging and the result of the seismic facieses study, Nuclear three sections No.2to No.7oil formation are mainly delveloped microfiches of the delta front and Former delta phase, and it can subdivide into six microfiches, including underwater distributaries channel, estuary dam, sand bank, sheet sand, underwater bay between branches and predelta mud six microfiches. The distribution of sand bodies and sand research indicates that the research area provenance is mainly from the ancient city of delta in North-east place. The sheet sand and the Far bar heterogeneity is relatively weak. Through the study of the heterogeneity, we can find that the heterogeneity of distributaries channel and mouth bar are strong but the sand sheet and far sand dam’s heterogeneity are relatively weak. Sand bodies’encounter rate is higher under the No.5oil group than the upper oil groups, the heterogeneity is weak in the No.4and V oil group, but it is stronger in No.2, No.3, No.6, No.7oil group. There are lithologic oil deposits, the fault-lithologic reservoir and fault-nose-like structure in this study area. The oil deposits size are smaller and scattered distribution. The core of the reservoir description is three-dimensional distribution of oil and gas reservoir, constructing a three dimensional geological model is a focus of reservoir description. This article uses the Petrel modeling software, combine with the geological structure and sedimentary characteristics of the area, use stochastic simulation technology and establish the tectonic model, the sedimentary facieses model and the property model in accordance with walnut garden group nuclear three Ⅱ～Ⅶ oil geological.Based on the above research results, using the volume method of reserves in the study area were predicted, using K-means clustering method combines test and production test data on the production of a comprehensive evaluation of reservoir, and finally put forward a favorable regional and horizons and provide a reliable basis for the next step in the exploration and development of oil field.