| Distribution of Sinian-Lower Paleozoic hydrocarbon in central basin is complex.Palaeotectonic pattern in different geological period control the generation,migration,accumulation of oil and gas,its horizontal distribution and vertical strata controlled by paleo-lift,therefore,the study of paleo-lift evolution,control of hydrocarbon accumulation by lift have been playing an increasingly important role in deep natural gas exploration in Sichuan basin.Combined with previous research,as well as using the latest geological data,seismic data,logging data,hierarchical data,testing data and geochemical analysis data,the author has clearly shown the tectonic framework of 2nd and 4th members of Dengying formation,Cambrian Longwangmiao formation in central Sichuan basin and tectonic evolution of uplift,as well as connection between Sinian-Cambrian hydrocarbon accumulation and paleo-lift.According to paleo-lift corresponding relation among tectonic evolution,source rocks,reservoir and hydrocarbon migration,we clearly understand the central paleo-lift tectonic evolution has strong effects on hydrocarbon accumulation including the control of source rocks distribution with thermal evolution,reservoir,oil and gas migration,accumulation process and mode.Finally,the author establish the mode of controlling connection between paleo-lift and hydrocarbon accumulation,then the accumulation probability distribution quantitative formula controlled by paleo-lift as well as the probability of critical accumulation period.What is more,we have succeeded in proving the favorable accumulation target with the accessible drilling well data.It is worth to note that more than 52%of accumulation belong to predicted favorable area and over 97%locate the predicted,or relatively favorable area;Hence,this mode has a certain reliability.The research has an important reference value for the understanding of deep petroleum features and the future exploration direction. |
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