New Cognition of Sedimentary Facies of Sangonghe and Badaowan Formations in Karamay Zhongguai Area

The Jurassic in Zhongguai area in Karamay field is a steep slope sedimentary system with high hydraulic gradient,quick change of facies belt and varied thickness.Based on its lithology,log facies and seismic facies marks in this area in northwestern margin of Junggar basin,the calibrations of log facies from core microfacies and seismic facies from log facies are conducted.The comprehensive study shows that Sangonghe and Badaowan formations of the Lower Jurassic in Zhongguai area is characterized by deposits of medium-small fluvial fans,braided river deltas,and can be classified into 5 facies,16 sub-facies and 43 micro-facies.The most favorable reservoir horizons and facies belts are also determined in this paper.