IMPACT OF DYNAMIC FAULT DAMAGE TO CAPROCK ON OIL AND GAS RECOVERY OF TIGHT SANDSTONE

In order to improve the oil and gas exploration efficiency and recovery rate, the effect of the dynamic failure of the fault to the caprock on the oil and gas recovery of tight sandstone was studied. The influence of faults on oil and gas accumulation is analyzed in four parts: fault conductance, fault plugging, fault enrichment, and the effect of faults on the overall distribution of oil and gas. Based on the analysis results, the impact of faults on the damage of tight sandstone oil and gas reservoirs, and the damage scope and mechanism of dynamic damage of faults to caprock on tight sandstone oil and gas reservoirs were revealed. A model is constructed to realize the impact of dynamic failure of faults to the caprock on tight sandstone oil and gas recovery. The model is used to test a depression area with fault as the main structural type to verify the reliability of the model. Experimental results show that the evaluation model has high accuracy and robustness, and the application of the model in this paper can improve the efficiency of oil and gas exploration and the recovery rate.