The Study Of Fine Depiction Of Single Sand Boby And 3D Geological Modeling Of Chang 6₁ Reservoir In S392 Oilfield

The S392 oilfield is located in the Wuqi area,an important oil producing area in the Erdos Basin.The chang 6 is the main development layer in the study area.The oil layer is thick and the oil area is large and has a great potential for development.However,there are many problems in the study area,such as poor physical property,low single well production,strong heterogeneity and low development efficiency.In this study,from the point of view of geology,through the establishment of the fine depiction technology of single sand body and the three-dimensional geological model of the chang 61 layer,a more complete and fine geological understanding of the target layer is formed.On this basis,the measures to solve the problem of injection and production in the study area are put forward so as to achieve the purpose of solving the production contradiction.This study mainly adopts the theoretical methods of high resolution sequence stratigraphy,logging interpretation,sedimentary petrology,fine depiction of single sand body and three-dimensional geological modeling.The results show that the study area chang 61 is delta front deposit,and sand bodies are mainly underwater distributary channel deposits with large sand body thickness and strong hydrodynamic conditions.In the chang 612 period,a set of typical multi-stage river stacked and thick sand bodies developed,the calcareous intercalation was particularly developed,the sand body lithology was mainly fine sandstone,the physical property was poor,and there was a strong heterogeneity in the layer,and the chang 61 sand body appeared ten kinds of single sand body contact form.The lateral tangential type A of calcareous interlayer,the lateral tangential type B of calcareous interlayer,the compound lateral shear of developing calcareous interlayer and the vertical superposition of calcareous interlayer form four kinds of special disconnected contact form of calcareous interlayer.According to the above research,it is considered that sedimentation plays a key role in the connectivity of reservoirs.Base on the comparative analysis that the connectivity of reservoir in the study area and perforation data,and we put forward some measures to fill holes in some wells,adjust the corresponding relation between injection and production,and improve injection production efficiency.