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Characteristics and favorable reservoir forming conditions of igneous reservoir in Liaohe basin

Liu Shiwen (Exploration & Development Research Institute of Liaohe Oilfield Branch Company, PetroChian, Panjin, Liaoning 124010,China)  
Based on extensive survey and research, igneous reservoir characteristics and its forming conditions in Liaohe basin have been analyzed and summarized. It is concluded that oil bearing situation varies with lithology of oil bearing igneous rock. In detail, Andesite and basalt features thick and multi oil bearing layers, mostly oil speckle type oil bearing attitude, while that of trachyte and tuff are oil bearing and rich oil bearing in the contrary. Pores in igneous reservoir belong to original and secondary, and secondary fracture is the dominating factor of reservoir permeability. Near rift area is one of the most favorable areas for exploring igneous rock. For Liaohe basin, reservoir forming conditions of igneous rock are outstanding, including anticline, unconformity, drape anticline, buried hill, fault nose, block and updip pinchout. Surely, exploration of igneous reservoir will be a new development point for increasing the reserve and production of Liaohe basin in the future.
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