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HYDROCARBON MIGRATION PATHWAY SYSTEM TYPES AND EVOLUTION IN THE AKEKULE RISE,TARIM BASIN

Li Kun Zhao Xikui Zhang Xiaobing Ye Bin(State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Engineering,Chengdu University of Technology,Chengdu 610059)  
The Akekule Rise is a sub-order tectonic unit in the northern Tarim Basin.Controlled by several tectonic movements during the long geohistory,the oil-gas accumulation there was characterized with long-term hydrocarbon-generation,multiple-epoch providing and complicated pathway systems.Based on an analysis of transportation pathway,capability and effect,the pathway systems could be divided into four types: the fault-type,the unconformity-type,the carrier bed-type and the combination-type.By reconstructing the paleo-tectonic framework on the base of seismic data and well information,analyzing evolution and their coordinate of the pathway systems,and recognizing the dynamic processes of oil-gas migration,our work pointed out that the regional deep faults were main paths for vertical transportation of oil and gas.Furthermore,our study found that the superposition of carrier bed and unconformities,such as the top surface of Lower-Middle Ordovician(T47),the top surface of Upper Ordovician(T07) and the top surface of Silurian(T06),was a key factor for horizontal migration of oil and gas.The geometrical shapes of the pathway system, especially the distribution of the paleo-structural ridge during the key epochs of oil-gas gathering in geohistory,might decide the predominant migrational direction and path of oil and gas.In the Akekula Rise,the most distinct character of oil-gas transportation was: a compound pathway system consisted of fault,unconformity plane and karst network,and the hydrocarbon migration along structural ridge in a form of three-dimensional netted ladder.
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