| A vuggy/fissuring weathering-crust reservoir develops in the uppermost part of the middle Triassic Leikoupo Formation in the XC Structure Belt in Chuanxi Depression, Sichuan Basin. The XC Structural Belt is comprised of a number of anticlines such as XQ, XC, HXC, LXC, WX, GMZ, and FG anticlines. Because of deep bury and complex geological conditions of the structure belt, it is difficult to predict accurately the sedimentary facies distribution of the reservoir by using any single technical method. Based on the sedimentation characteristics and the seismic response characteristics, a series of compatible technical methods which include waveform classification, seismic attributes, coherence analysis and impedance inversion are set up and used to predict the distribution of favorable sedimentary facies in the Leikoupo weathering-crust reservoir. According to the prediction result and the comprehensive evaluation, it is shown that the XQ-XC-WX anticline zone is favorable for reservoir development, the HXC-FG anticline zone is next and the rest anticlines are relatively poor. |
