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《Acta Petrolei Sinica》 2011-04
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Key challenges and strategies for the success of natural gas exploration in mid-deep strata of the Yinggehai Basin

PEI Jianxiang YU Junfeng WANG Lifeng HAO Defeng LIU Feng (CNOOC China Ltd.Zhanjiang,Zhanjiang 524057,China)  
Three key problems confronted with the natural gas exploration of mid-deep strata in the Yinggehai Basin were discussed here: ①whether natural gas can accumulate in super-overpressure strata;②within a complicated sedimentary system of mid-deep strata,distributional disciplines for high-quality reservoirs are hard to be mastered;③reservoir evaluation and hydrocarbon detection techniques encounter a choke point to be improved,which in turn leads to difficulties of gas identification in reservoirs.Drilling and prospecting practice in high-temperature and high-pressure mid-deep strata in recent years demonstrated that gaseous hydrocarbons could have accumulated in mid-deep strata,where,however,reservoirs developed with poor porosity and permeability.Therefore,the key to the success of natural gas exploration in these strata is to find high-quality reservoirs.Strategically,a couple of policies gaining access to the success of natural gas exploration were proposed as follows: firstly,to look for payable facies belts and predict good reservoirs by using approaches of seismic sedimentology;secondly,to fully understand variations in physical properties caused by heterogeneity in reservoirs and search for distributional disciplines of good reservoirs by analogy with various reservoirs;and thirdly,to use high-precision 3D seismic data to try prestack inversion on the basis of petrophysical studies so as to improve the reliability of hydrocarbon detection and the precision of gas reservoir prediction.
【Fund】: 国家“十一五”重点科技攻关项目(2008ZX05023-004)资助
【CateGory Index】: P618.13
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