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Exploration theory and practice of the Tertiary subtle reservoirs in Jiyang depression

Zhang Shanwen(Shengli Oilfield Co.Ltd,SINOPEC,Dongying,Shandong 257000)  
Jiyang Depression,a typical terrestrial rifted basin experienced complicated tectonism and sedimentation,contains many well-developed subtle reservoirs.Research on the forming mechanism of the subtle reservoirs reveals three important theoretical understandings.First,steep and slow slope fault-steps and innerand outer-basin slope-breaks shaped during fault-dominated tectonism control the formation and distribution of reservoir rocks(also known as 'faulting-slope-controlled sandstone'),making the place an ideal area for exploration of subtle reservoirs.Secondly,different hydrocarbon conducting paths with the shape of meshwork-carpet,capi-tal letter 'T',ladder,and fractures,develop and operate inside the particular time-space tract in the basin,constituting a complex hydrocarbon transportation system(also known as 'compound transportation') and providing information for the evaluation of exploration direction of subtle reservoirs.Finally,the coupling relation between facies(receiving condition) and liquid potential(driving condition) determines reservoiring conditions and charateristics(also know as 'facies-potential-controlled reservoirs').These understandings constitute the kernel idea of subtle reservoir exploration and promote effectively the petroleum exploration in Jiyang depression during the Tenth Five-Year Plan.
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