Sedimentary Microfacies in Qian 43 Formation of Wangchang Oilfield of Qianjiang Depression

Based on geologic background, the integral analysis on core observation, particle size analysis and logging curve shape indicates that in Formation Qian 4~3 of Wangchang Oilfield, the mid and sub-facies of sublacustrine fan (turbidite ditch) sedimentary facies in the delta (or fan delta)- sublacustrine fan (or turbidite ditch) sedimentary system is grown, different characters of sedimentary facies distribution are pointed out. In combination with the analysis on test data, it is determined that braided ditch microfacies, turbidite rock microfacies of the central facies are beneficial facies belts. Different sedimentary facies are used as statistic unit to analyze the motion laws of oil and water in different microfacies areas. Adjustment is made on injection-production well patterns and rolling production with better production effect.