Nine Carboniferous Volcanic Reservoir Geological Characteristics

Based on the former research findings and the testing analysis achievement by studying the theory of reservoir geology and combined with lithology, tectonics and well-logging theory, the paper synthetically uses advanced testing analysis technology, analyzes the lava reservoir geologic feature of each well of the 9th section oil field in Carbonic, and speculates whether it has oil, and finds the reason of non-petroliferous, and applies accurate data of oil pool geology to choose reasonable oil extraction scheme. Research believes:1. The character of lava is difficult, and it isn't easy to forecast the distribution. However, it can be divided into tuff, fulgurites and breccias according to the characters of rock structure and dynamic features.2. The paper figures out that the cracks developed in four periods through the observation of the rock core and the analysis of the regional structure. The main orientation of the cracks is NE 40° ~50°, and has a better silting.3. The paper figure out that geostress isn't fit to the main crack orientation through the research of modern geostress and the relations to cracks, and has common effect to crude cracks.4. The paper summarizes some methods by using well-logging data to distinguish and evaluate cracks according to the well-logging data, especially imaging well-logging data, and the analysis of the relevant well-logging features.5. The paper founds a counting cracks parameter mode for conventional well-logging data based on the data of rock core and imaging well-logging and the relevant well-logging features of cracks in Carbonic. Also, it gains extent of porosity parameters of eight wells. On this, it finds a method to distinguish and divide effective reservoir.