| In this paper,by thoroughly investigating the results of previous studies and combining the latest basic data,the oil and gas transmission system in the JX1-1 area of Liaozhong Depression has been thoroughly analyzed.Based on this,the characteristics of hydrocarbon accumulation in the study area have been integrated,the results of the oil source comparison and the history of oil and gas accumulation,eventually established the hydrocarbon accumulation model of the JX1-1 oil field.The source rocks of the Liaozhong sag are well-sufficient.Both the Es3,Es1 and Ed3 belong to the high-quality source rocks.The tectonic activities in the study area are complex and the faults are widely developed.The Liaozhong No.1 strike-slip fault and associated secondary fractures are the main oil and gas transmission system in the study area,they provide a pathway for oil and gas to migrate from the bottom up.Based on the comprehensive analysis of the factors affecting the sealing of the fault,the authors put forward the fault closure comprehensive index method,established the evaluation criteria for the fault sealing in the fault zone,and evaluated the sealing of the main faults in the study area.The skeleton sand body in the study area is well developed.The Es2,Ed2 and Ed3 are the major oil and gas accumulation reservoirs.The sand bodies are widely developed with good permeability and permeability,and have good oil and gas transport and accumulation ability.The single transport element of oil and gas migration in JX1-1 oilfield are mainly faults and sand body.Each independent transport system has strong oil and gas transport performance.Under the configuration of both,the oil and gas transport ability is greatly enhanced,Therefore,the fault-sand body composite transmission system is the main type of transmission system in the study area.The research shows that there are significant differences in the combination of east and west plate in the study area,of which the west plate mainly takes the form of "T" and the east are mainly based on ladder-type combined transportation,the two different modes of oil and gas migration provide a channel guarantee for the migration of oil and gas in the JX1-1 oilfield.By comparing the results of the two east and west oil sources in the study area,it is shown that the source of oil and gas mainly comes from the middle and lower parts of the Liaozhong Sag,the third member of Shahejie Formation,the first member of Shahejie formation and the lower third member of Dongying Formation are the main hydrocarbon-generating layers in the study area.Oil and gas are mainly from the western plate,and are basically late accumulation,combined with the law of oil and gas accumulation,the hydrocarbon accumulation model in the study area was established. |
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