Abstract：The lithology and lithofacies of the Permian igneous rocks in the Chengdu-Jianyang area change rapidly, and the reservoirs are dominated by volcanic clastic rocks and clastic lava of explosive facies. The multi-stage eruption and intrusion superposition of igneous rocks lead to strong heterogeneity in both vertical and horizontal directions, which makes it difficult to identify volcanic edifices and reservoirs of explosive facies. Through forward modeling, this paper analyzes the internal structural characteristics of the volcanic edifices in this area and establishes an igneous rock evolution model featuring reservoirs formed by an early concentrated eruption and transformed by a late magmatic intrusion. The volcanic edifices are identified according to the sequence of volcanic channels-volcanic edifice shape-near and far crater facies-explosive facies. On this basis, with the help of facies-controlled fusion inversion technology, the distribution law of reservoirs of explosive facies is described, and a set of technical flows for multi-stage reservoir prediction of igneous rocks is formed, so as to improve the drilling success rate of high-yield wells in this area.
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