鄂尔多斯盆地奥陶系储层展布及勘探潜力

doi:10.11743/ogg20060317

Abstract

Abstract:

The Ordovician in Ordos basin had been deposited in a "three uplifts-two saddles-two depressions" paleotectonic framework.The three uplifts were horizontally distributed as the letter "L" and together controlled the sedimentary facies of Ordovician and the regional distributions of different types of reservoirs.The main reservoir types in Ordovician include sub-salt reservoirs in the eastern depression,residuum karst reservoir on the slope zone of the palaeohigh,dolomite reservoirs in the 4th member of Majiagou Formation on the saddle of the palaeohigh,Middle Ordovician gravity flow reservoirs in the western part of the palaeohigh,and bioherm or reef reservoirs on the southern slope zone of the palaeohigh.Among these reservoir types,the residuum karst reservoirs are the most favorable,and the large Jingbian gas field has been discovered in this reservoir type.Based on analysis of reservoir characteristics and hydrocarbon migration and accumulation,it is believed that the other 4 types of reservoirs still have relatively large exploration potentials,though no substantial progress has been made in exploration,thus they would be the key frontiers for exploration in the Lower Paleozoic in Ordos basin.

Key words: gravity flow, bioherm, gypsum-halite, residuum, Ordovician, Ordos basin

CLC Number:

TE112.2

Xi Shengli, Li Zhenhong, Wang Xin, Zheng Congbin. Distribution and exploration potential of Ordovician reservoir in Ordos basin[J]. Oil & Gas Geology, 2006, 27(3): 405-412.

References

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Distribution and exploration potential of Ordovician reservoir in Ordos basin

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