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储层的非均质性是影响岩性油气藏勘探开发效益的关键因素之一。通过分析鄂尔多斯盆地榆林—米脂地区的基准面旋回层序叠加样式与砂体成因、储层物性特征和成岩相组合特征,识别出3种类型的基准面旋回叠加样式,不同位置和不同沉积体系中发育不同的基准面旋回叠加样式;主要分为压实、压实—胶结和胶结—溶蚀3种成岩相组合;建立了物性向上变化不大、物性向上变差、物性向上变好、物性向上变差后复变好、物性向上变好后复变差和物性变化复杂6种储层非均质性成因模式。基准面旋回变化和成岩作用是岩性油气藏非均质性的主要控制因素。在中期基准面旋回早期,充填在层序界面之上的进积—加积型的分流河道和水下分流河道砂体以发育物性向上变化不大、物性向上变差和物性向上变差后复变好3种成因的非均质性储层为主,非均质性相对较弱,为最有利的储层发育相带。
Reservoir heterogeneity is one of the key factors affecting the efficiency of exploration and development of lithologic reservoirs. By analyzing the superposition pattern of base-level cycle, the genesis of sand body, the physical property of reservoir and the assemblage of diagenetic facies in Yulin-Mizhi area, Ordos Basin, three types of datum cycle superimposed patterns, different positions and different depositional systems There are three types of diagenetic assemblages of compaction, compaction-cementation and cementation-dissolution. There are three types of diagenetic assemblages: physical properties are not changed upwards, physical properties are upwards, physical properties are upwards, physical properties are upwards After the deterioration of complex change is good, the physical properties of the upward change after the complex variation and complex physical changes in six reservoir heterogeneity generative model. The change of base-level cycles and diagenesis are the main controlling factors for the heterogeneity of lithologic reservoirs. In the early mid-term basaltic cycles, the pluvial-cummulating distributary channel and subaqueous distributary channel sand bodies that filled above the sequence boundaries changed little in development physical properties, the physical properties increased upwards and the physical properties increased upwards and retarded Three heterogeneity reservoirs are dominant, with relatively poor heterogeneity, which is the most favorable reservoir facies belt.