Research Of Reservoir Geology And Development Plan For Shawan Formation In Pai-2 Area

Well Pai-2 is located on the east No. 2 structure of Chepaizi raise on west uplift, Zhunga-er Baisin. The acreage of the oil field is 15.4km2 with hydrocarbon reserves of 800×104t. The main reservoirs are the beach and bar sand bodies formed by redistribution of the delta sediments. By strata contrast and core analysis, it is considered that two sets of oil-bearing sand bodies: Pai 2 and Pai 206-x15 are existed in this area, and their have middle-shallow burying depth, mid abundance and high productivity, belongs to low density rude oil. The reservoirs are characterized by super-high porosity and permeability, but also sensitive and conversant to water. So the reservoirs are easily to be damaged and consequently affected the final recovery efficiency.Based on the available data, reservoir structure research, reservoir comparison and distribution prediction, fine logging interpretation and reservoir parameter calculation were achieved, and it can be considered that the physical properties of the Pai-2 sand-body is well-proportioned and well-connected on the plane, but its productivity is not stretchable and the natural energy is deficient. Based on these recognitions, by the analysis of production method, development formation division, development well grid and well spacing, single well daily rate and recovery efficiency prediction, etc, a development plan was brought to effect: it is all around affusion and made the oil-well of east fault sparse, and predicted the recovery efficiency of 55%, provide a sound foundation for the future development in the area.