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岩相单元是比小层更细、更能体现油藏地质特征的单油砂体。通过对岩相单元的细分与对比,可以满足油田开发中后期挖掘剩余油潜力的需要。以克拉玛依油田五2西克下组为例,遵循等时对比的原则,利用电测、岩心资料,以标准井为基础,作连井拉平沉积剖面图,从标志层、沉积旋回、沉积微相、砂体(油层)连通关系等方面进行对比,完成了区块的对比及统层。认为五2西克下组S7层属扇三角洲沉积,主力油层为S47;该层北部砂体厚度大,分布面积较广,连通性好,向南向西则逐渐变薄,面积变小,连通性变差,横向变化大,分布零散。
The lithofacies unit is a single oil sands body that is finer than the small one and better reflects the geological characteristics of the reservoir. Through the subdivision and comparison of lithofacies unit, the need of excavating residual oil potential in the middle and later stages of oilfield development can be met. Taking the second group of Kelamayi oilfield, for example, Wuchang 2 2 as an example, according to the principle of isochronous comparison, using electrometric and core data, based on the standard well, , Sand body (reservoir) connectivity and other aspects of comparison, completed the contrast and unified layer. It is considered that the S7 layer in Wuzishan Formation belongs to the fan delta deposition and the main oil layer is S47. The sand body in the north of this layer is thick, with a wide distribution area, good connectivity and gradually thinning from south to west, with smaller area and connectivity Sexual variation, lateral changes, scattered distribution.