二连盆地巴音都兰凹陷白垩系巴彦花群阿尔善组阿三段沉积时期火山活动剧烈,为火山碎屑岩沉积提供了条件。主要岩石类型为安山质凝灰角砾岩及粗面安山角砾岩等沉火山角砾岩和沉凝灰岩。储层物性主要受裂缝和孔洞影响,裂缝以高角度缝为主,孔隙类型主要有粒间孔、粒间溶孔及粒内溶孔。特殊的储层类型,形成了独特的油藏类型和勘探方法。 Cretaceous Bayanhua Group in the Bayin Dulan Depression, Erlian Basin. The volcanic activity during the deposition of Asan Section of the Aershan Formation in the Erlian Basin was violent, which provided the conditions for the volcaniclastic deposition. The main rock types are andesite breccia and coarse andesite breccia and other volcanic breccias and sedimentary tuff. The physical properties of reservoirs are mainly affected by cracks and holes. The fractures are dominated by high-angle fractures. The types of pores are mainly intergranular pores, intergranular dissolved pores and intragranular dissolved pores. Special reservoir types have resulted in unique reservoir types and exploration methods.