The Study On Remaining Oil Distribution Of Hainai3 Fault Block In Yuehai Oil Field

Hainan 3 fault block located at the southern tip of low central uplift in Liao He basin, It consists of Hainan 1 block and Hainan 3 block. It has thin oil layer with complex relations of oil and water, the thin layer sand body have been developed as the main target interval, the fault play an important role in distribution of remaining oil. Based on fine recognition of fault, we studied the distribution rule of remaining oil. The faults, especially minor faults were recognized by analyzing the drilling, logging, well test, pilot production and 3D seismic data, and provides a strong support for the distribution of remaining oil study. Based on the newly identificated structure, for the remaining oil that can be classified by sidetracked drilling we can use classifying tapping.(higher position of structure、 sub-fault block、inperfect injection well pattern、reservoir phase change)Hainan 3 fault block is a complax fault block field with fault development and structure fragmentation. After more the 20 years’ development, the distribution of oil and gas has changed significantly,and residue oil was generally hilghly dispersed but relatively gathered.Dongyin group NO.Ⅲis the main oil reservoir which has the characteristic of long oil-bearing well section、multitude oil formation and thin single layer. Based on the water-injection development condition and problem, according to new structure and the princelpe of plainarly regionalization、vertically layering, the injection method was changed from dimensional injection to micro-facies structure injection,from stable injection to unstable injection.Combing water-driving characteristic of medium-low reservoir, water-driving efficiency can be utmostly improved by adjusting and optimizing injection method.