基于解释单元划分的多曲线联合确定地层原始沉积韵律

沉积韵律是控制厚层砂体内部水淹分布规律的主要控制因素。只有在同一口井内同一个沉积韵律内部各小层的电性特征才具有相对可比性,因此，也只有在同一口井同一个沉积韵律内部判断各小层水淹级别高低才更具有实际意义。以稳定泥岩隔层为划分标志，将测井曲线划分为与沉积韵律一一对应的解释单元。联合深（浅）电阻率曲线与密度测井曲线，以厚层砂体电阻率曲线的平均斜率倾斜角及密度曲线的相对重心为判别参数，利用计算机自动判别出每一个解释单元中所包含的原始沉积韵律类型。3口密闭取心井处理结果表明，本文方法可以有效地划分原始沉积韵律，与人工解释结果对比，符合率达到92.5%。

Multi-Curve Jointly Determine the Original Sedimentary Rhythm Based on the Interpretation Unit Discrimination

This paper represents that the sedimentary rhythm is a primary factor to control the distribution of water flooded zones in the thick-layer sand. The electrical properties of layers in the same well are comparable and the water flooded level discrimination has more practical significance only in the same sedimentary rhythm.The stable mudstone barrier bed is adopted as the separable symbol for different interpretation units that are identified from well logging curve so that only one sedimentary rhythm is contained in each interpretation unit. The average slope angle of resistivity curve and relative center of gravity of density curve are adopted as discriminant parameters for identifying the original sedimentary rhythm by computer in each interpretation unit. The processing results of three sealed core wells show that this method can discriminate accurately the original sedimentary rhythm, therefore, the interpretation coincidental rate is up to 92.5% compared to the manual interpretation.