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《Acta Petrolei Sinica》 2011-01
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A re-recognition of the prospecting potential of Jurassic large-area and non-conventional oils in the central-northern Sichuan Basin

LIANG Digang RAN Longhui DAI Danshen HE Zixin OUYANG Jian LIAO Qunshan HE Wenyuan(CNPC Advisory Center,Beijing 100724,China)  
The present paper made a re-recognition of Jurassic oils in Sichuan in terms of the four aspects,such as resource potential,reservoir types,fractured reservoirs and techniques of exploration and development.The paper has drawn the following conclusions.①The Jurassic oil resource in Sichuan may be much more than the presently discovered amount of 1.0~ 1.1 billion tons.②The Jurassic oil resource is a special large-area and non-conventional compact oil accumulation that has no clear trap boundaries,no clear edge-water,bottom-water and oil-water boundaries like a "water-free reservoir",and no clear differentiation between buoyancy and gravity.Their reservoirs are characterized by inner-source or near-source accumulation rather than large-scale secondary migration,ultra-low permeability,dual media,large-area entire oiliness,superimposed and linked multi-measures,"continuous" occurrence on slopes or in depressed areas,being restricted by lithology rather than local structures,and delimitating oil-bearing and well distribution areas frequently by output instead of reserve.③Jurassic reservoirs can not be simply defined as "fractured type" because various pores contribute significantly to both the reserves and long-term low but stable production though fractures are the prerequisite for a high output at the testing or production beginning.④These exists a great reserve for this kind of non-conventional compact oils in the central-northern Sichuan,however,a non-conventional technique consisting mainly of hydraulic fracturing should be adopted in development.It was proposed that Shaximiao Formation in the Longgang area should be a prospecting target,which will be a breakthrough to open a new era for petroleum exploration in Sichuan Basin.
【CateGory Index】: P618.13
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