3D Geomodelling Of Moga Oilfield Based On Seismic Inversion

Moga oilfield is one of the most important fields of Sudan 6 area.The finding of exploration favorable structural and new potential target zone in the oil field will make great contributions to maintaining and increasing oil production.Therefore,it is necessary to do the modeling and adjust the development strategy to maintain or improve recovery degree.This paper depends on Tuha/BGP in PE Moga oilfield project to carry on the corresponding research.The purpose is to create a fine 3D geological model which can accurately reflect the geology conditions and provide solid geological model foundation for reservoir simulation and prediction.In this paper,based on the study of structure characteristics,well correlation,facies,reservoir physical properties,fluid properties and production performance,combined with seismic inversion constrained,3D model is established.After that the model which is built using the log data and the model built both using log data and seismic inversion constrained are compared and finally the seismic inversion constrained model is chosen as the geological mode of Moga field and reservoir simulation and production prediction work have been done.Achievement of this paper are as follows:1.By using the Constrained Sparse spike inversion(CSSI)of the Jason software can get the high-quality impedance volume data,and then select the appropriate parameters of the geological characteristics to do the geostatistical inversion and get the reasonable properties for geological modeling.2.Based on the previous work,combined the well data and seismic data,using the method of seismic inversion constrained modeling,making full use of drilling,logging,laboratory analysis data,basing on geological characteristics,depositional environment,reservoir properties,structure model of Aradeiba and Bentiu formation are established.There are more than 200 fractures are built in the model and the grid size is 50m*50m.Based on this structure model,well log data and seismic inversion constrained method are used to build the facies model perspective.Then seismic constrained facies model is chosen to do next step.The property model including porosity,permeability and saturation model are built.3.To do the dynamic validation of the model,from the perspective of numerical simulation,single well matching error is 85% and the production indicators in the next 20 years are predicted.It shows that the established structure of sand body and property parameter model can not only better understanding of the geological characteristics of the reservoir,but also for efficient developing of Moga oilfield,making a reasonable water injection development program and providing an effective,scientific basis for dynamic prediction.The results of this paper show that the seismic constrained modeling method can better describe the reservoir geological features,reduce the uncertainty and improve the accuracy of the model,then provide the geological model for reservoir simulation and production prediction.