Study On Geological Modeling Of Fluvial Facies Sandbody

In the oilfield exploration, appraisal and development phases, the aim of reservoir study is to build a quantificational 3-D reservoir model. This is the further need of oil-gas exploration and development, as well as the further progress of reservoir studies.The fluvial deposited sandbody has a great variety in the lateral and vertical direction. The reservoir is characterized by high heterogeneity, which makes it very difficult to be developed. Recognizing the heterogeneity or the petrophysical parameters distribution of the reservoir is the key to make rational development polices and develop the field efficiently. Especially, in the Bohai offshore area, almost 80% of the proved reserve in Neogene occurs in fluvial deposited sands. Accordingly, in order to increase its hydrocarbon output, making a specific geological model and depicting heterogeneity accurately of the fluvial facies reservoir plays an important role.The thesis gives an example how to study the heterogeneity of fluvial facies reservoir by modeling the South area of A Oilfield in Bohai offshore area. Specifically, the reservoir study is based on fine sedimentary microfacies division and sublayer correlation, moreover, such methods as, the marked point process and simulated annealing to simulate facies are used, which also is constrained by the seismic data. Then under the facies control, using sequence Gauss to model 3-D distribution of the petrophysical parameters. The model deepens sandbody distribution understand, oil-gas occurrence and the reservoir's geological characteristics. The model is the base of the reservoir numerical simulation and it has been successfully applied to the scenario implementing and stimulation studying. This way is a new thought to improve recovery and the development effect of offshore viscous oilfields.