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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2009-06
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Study on petroleum geological conditions and hydrocarbon exploration direction of Leikoupo Formation in the centre and west of Sichuan Basin,China

WANG Hua1,2,LIU Shu-gen1,QIN Chuan1,ZHANG Chang-jun1,WANG Guo-zhi1,LI De-xing1,DAI Han-song1 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;2.The Southwest Oil and Gas Field Co.,CNPC,Chengdu 610051,China  
So far only two medium-large gas fields,i.e.Zhongba and Moxi gas fields,have been discovered in the Middle Triassic Leikoupo Formation in Sichuan Basin.However,evidences of oil and gas from Leikoupo Formation during recent drillings are common,showing a good petroleum exploration prospect in the formation.Most of Leikoupo Formation is restricted platform facies and a small part of the formation is open platform and evaporated facies in the centre and west of Sichuan Basin.Their main subfacies are lagoons and tidal flats.The crust of this area is in an extensional state during the Leikoupo Formation deposition.The source rocks of Leikoupo Formation are good.There are several types of high quality reservoirs in Leikoupo Formation,such as reef-bank reservoirs,hydrothermal dolostone reservoirs,paleokarst reservoirs,and so on.The gypsum and mudstone are the good covers of Leikoupo Formation.Therefore,Leikoupo Formation has good geological conditions and can form medium-large gas pools.The new exploratory directions of Leikoupo Formation are to look for reef-bank reservoir gas pools,hydrothermal dolostone gas pools and paleokarst reservoir gas pools in the centre and west of Sichuan Basin.The front regions of Longman Mountains(western Sichuan Basin) are the important exploratory areas.However,the distance between the source rocks(Upper Permian Longtan Formation) and reservoir rocks is so far that fault-fracture systems must act as migration pathways(conduit system) for petroleum and gas.The conduit systems must break through the Upper Permian Longtan Formation and Lower Triassic gypsum.Therefore,the study of conduit systems of gas is important in predicting the favorable exploration area in Leikoupo Formation.
【CateGory Index】: P618.13
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