IGNEOUS LITHOFACIES TYPE AND ITS SIGNIFICANCES OF PETROLEUM GEOLOGY IN BEIER SAG

Based on the research on tectonic evolution and volcanism,according to the core,thin slice,well logging,seismic survey,gravity and magnetic data,studies on the igneous-related lithology and distribution of Budate group are carried out.The results show that the lithofacies and distribution are closely related to the volcanism,the volcanic rocks,pyroclastic rocks and clastic rocks are distributed in girdle pattern controlled by the eruption of central type.Then the rocks of Budate group can be classified into three sub-lithofacies and six micro-lithofacies.Finally,the igneous-related lithofacies and distribution mode of Budate group is established.In addition,the domination of igneous-related lithofacies on the types of reservoir space and degree of fracture growth are also studied.The discovery of volcanic sedimentary zones being advantageous reservoir zone is significant to predict distribution and new exploration realms of other secondary faulted buried-hill advantageous reservoir.