Imaging Logging Application of Upper Paleozoic Sedimentary Characteristics of Yanchang Gas Field

Based on imaging logging data, Sedimentary microfacies types, crack and pore can be reflected. The depositional systems and sedimentary facies characteristics, imaging logging data and sedimentary microfacies correspondence of Upper Paleozoic strata in Yanchang gas field are analyzed from the materials of imaging logging. The result shows that horizontal bedding,parallel bedding and cross bedding are developed,and have the structural feature of erosion-filling level and imaging logging can reflect all kinds of bedding well,barrier coast, shallow continental shelf, meandering river delta and braided river delta depositional system of Yanchang gas field are developed.Bedding development characteristics, rock graded changes and lithology changes can be identificated the imaging logging, it has good correspondence with the characteristics of depositional facies.