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THE PROSPECT OF VOLCANIC ROCK OIL RESERVOIRS IN ERLIAN BASIN

Yu Yingtai (First Petroleum Exploration Corporation,North China Petroleum Administration)  
This paper gives preliminary analysis on the prospect of the exploration of volcanic rock oil reservoirs in Erlian basin,based on the distribution of the volcanic rock formations,petrophysical characteristic of the reservoir rock,and condition for the formation of oil reservoir.Volcanic rocks is widely distribu- ted in the basin and is formed in various formation.Various types of rocks, such as lava,tuff…etc are discovered.The storage and permeable space is mainly composed of 7 types of pore space,ie.:fractures solution caves and cavities…etc.Coarse grained volcanic rocks,siliceous volcanic rocks have bet- ter storage space.Near crater phases belt,structurally high and faulting belts fractures and cavities are well developed.The oil in the volcanic rock reserv- oirs discovered is migrated from lower Cretaceous Aershan and Tenggeer,with an abundant oil source.In addition to the stratigraphic unconformity other types such as fault barrier,fractured,pinch-out of the volcanic rock…etc,may be found also.Central uplift belt,steep flanks and its margin are favorable areas for petroleum exploration.Attention should be paid to the exploration of gas resources in the oil exploration simultaneously.Volcanic rock,clastic and metamorphic rock reservoirs integrated to form the complex petroleum accumulation region in Erleim basin.
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