【摘要】 川西上三叠统须二段以砂岩层巨厚、致密、非均质性和广布为典型特征,是该区的主要产气层,如何细化这类非均质性较强的储集层,从而提高勘探成功率是必须解决的难题。为此,以高分辨率层序地层学原理为指导,以沉积微相、测井相及组合模式为基础,将须二段内部划分出6个中期旋回,并通过井—震对比和地震层序约束,完成了该区须二段中期旋回的精细对比,并建立了高分辨率层序地层格架。在格架内以旋回为单元展开了砂体特征和储层展布研究,取得了较好效果。更多还原

【Abstract】 T3x2 is typically characterized by a very thick and tight sandstone layer that is inhomogeneous and widely distributed, and is the key gas-producing zone in West Sichuan Basin. How to finely delineate this type of reservoir with strong heterogeneity needed to be solved to improve exploration successful rate. On the basis of the theory of high resolution sequence stratigraphy, and sedimentary micro-facies, logging facies and their combination patterns, the paper divided the interior of T3x2 into six metaphase cyclic sequences, and completed fine comparisons of six metaphase cyclic sequences by comparing logging data and seismic data under the constraint of the seismic sequence, and built the strata framework of the high resolution sequence stratigraphy. Taking the sedimentary cycle as the unit, the paper studied well on the sandstone body properties and the reservoir distributions in the strata framework, with absolutely good results.更多还原