Comprehensive evaluation on tight sandstone oil and gas of Anpeng deep layer series in Biyang depression

Through hydrocarbon accumulation factors analysis on tight sandstone of Anpeng deep layer series in Biyang depression,the area is found to be characterized by gentle structure,abundance oil sources,tight reservoir,developed fracture,close contact between source rock and reservoir rock,and obvious water blocking effect of oil layers,therefore,the area is qualified with favorable conditions for tight sandstone reservoirs formation.After reservoir recognition and restudy of"Four-property relationship",the potential reserves of tight sandstone is 3 322×104 t,with the porosity is bigger than2.4%and permeability higher than0.2×10-3 μm2.Based on the geological features,multi-stage sequential fracturing technology has been applied and 7 series of development has been divided.In view of the main development series combination,reservoir fine study and target evaluation have been carried out,the horizontal well deployment for favorable area has been optimized,and multi-stage sequential fracturing has been implemented,which has achieved good development effect.