The Fine Geological Description To P I1-2 Pay Zones Of Lamadian Oilfield And It' S Application To Polymer Flooding Development

The P I 1-2 formation of Lamadian oilfield is a large sediment of fluvial facies under the environment of flood and distributary plain, the model of formation is complicated and changeable, the type of sand body is a composite system with huge thickness, the heterogeneity of sand body is very serious , the flooding characteristics of the sand body shows multi-section and rhyme.This paper is on the guide of modern sedimentary theories, refers to data of geological outcrop on open field, bases on the sedimentary characteristics and interfaces shown by well log data of high density well pattern in Lamadian oilfield, applies the method of model prediction and description, dissections the geometry and structure of the sand body from the large and rough to small and fine gradually. The sedimentary model of P I 1-2 formation of this oilfield is studied in full detail and discussed specifically, the relative geological model is established, and the eight formation tiny facies which meets the need of oilfield development are divided. By Application of the method of causes and effects model and dissection the sand body reasonably, the boundary of sand body is given in prediction, the composite sand body is dissection the single sand body. By analyzing the heterogeneity of formations, the static and quantitative description model which applied to divide the flow unit of formation is established.Basing on the above study, by the connection of single sand body or flow unit, the dynamic behavior of different well after polymer flooding and the geological factors which affects the effect of polymer flooding are analyzed. The type of rhyme, connection relation, tiny structure and the empirical relation between oil saturation before polymer flooding and the effect of improving the recovery after polymer flooding are given, and applies to determine the remaining oil distribution and analyze the stimulation effect widely. The geological bases of improving the effect of polymer flooding and making project of polymer flooding development and adjustment after polymer flooding are provided.