Optimization of Class II Reservoir Prediction and Production Improvement Technology of Medium-Viscous and Dense Reservoirs in the Northern Part of the Songliao Basin

Block A belongs to the medium viscous tight oil reservoir, which mainly develops tight oil class II reservoirs. It is difficult to identify sweet spot sand bodies, and the conventional fracturing reconstruction has no obvious production improvement effect, so it is difficult to increase storage efficiency and build production. In view of the characteristics of small scale, thin thickness and rapid lateral change of sand body, a technical route of “combination of well vibration, qualitative to quantitative, hierarchical prediction of reservoir groups to small reservoirs, mutual verification of multi-technology application, and guidance of sedimentary model” is developed to improve the accuracy of reservoir prediction. Based on the classification evaluation results of tight reservoirs, the fracturing parameter design matching the sand body size was optimized, and the oil production intensity was increased by 4.8 times compared with conventional fracturing, which strongly supported the exploration evaluation and productivity construction of medium-viscosity tight reservoirs.