Integrated Evaluation Approach of Complex Lithology Identification

The lithology of igneous rock formation is complex in Xujiaweizi faulted depression, Songliao basin, and using the conventional way to identify lithology will create larger error. For improve the complex lithology identification accuracy in this region, this paper analyzes the response characteristics between the lithology and log data by using parameters intersection recognition method, and confirms the log parameters combination which is used for complex lithology identification. Finally, this paper establishes systematic complex lithology recognition model of Xujiaweizi faulted depression using fuzzy hierarchy comprehensive analysis method, and identifies the lithology in Xushen block by VB programming. The verification result shows that the recognition correct rate can reach above 85%. The comprehensive judgment model of complex lithology has higher identification accuracy, and can be widely used.