【摘 要】
：
Tight sandstone reservoirs are generally char-acterized by complex reservoir quality,non-Darcy flow,and strong heterogeneity.Approaches utilized for evaluat-ing physical property cutoffs of conventional reservoirs maybe inapplicable.Thus,a comprehensive i
【机 构】
：
College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 26659
论文部分内容阅读
Tight sandstone reservoirs are generally char-acterized by complex reservoir quality,non-Darcy flow,and strong heterogeneity.Approaches utilized for evaluat-ing physical property cutoffs of conventional reservoirs maybe inapplicable.Thus,a comprehensive investigation on physical property cutoffs of tight sandstone reservoirs is crucial for the reserve evaluation and successful explora-tion.In this study,a set of evaluation approaches take advantage of field operations(i.e.,core drilling,oil testing,and wireline well logging data),and simulation experi-ments(i.e.,high-pressure mercury injection-capillary pressure(MICP)experiment,oil-water relative permeabil-ity experiment,nuclear magnetic resonance(NMR)experiment,and biaxial pressure simulation experiment)were comparatively optimized to determine the physical property cutoffs of effective reservoirs in the Upper Triassic Chang 6,Chang 8 and Chang 9 oil layers of the Zhenjing Block.The results show that the porosity cutoffs of the Chang 6,Chang 8,and Chang 9 oil layers are 7.9％,6.4％,and 8.6％,and the corresponding permeability are 0.08 mD,0.05 mD,and 0.09 mD,respectively.Coupled with wireline well logging,mud logging,and oil testing,the cut-off of the thickness of single-layer effective reservoirs are approximately 3.0 m,3.0 m,and 2.0 m,respectively.Depending on the cutoffs of critical proper-ties,a superimposed map showing the planar distribution of the prospective targets can be mapped,which may delineate the effective boundary of prospective targets for petroleum exploration of tight sandstone reservoirs.
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