地震多属性拟合技术在粗粒扇体沉积相图编制中的应用--以玛131井区百口泉组二段为例

由于砾岩岩石类型复杂，储层非均质性强，难以建立地震属性与储层之间的一一对应关系，导致应用地震属性常常具有不确定性和多解性。为了克服单一属性反映粗粒沉积展布的片面性，同类属性间相关信息的彼此干扰性，地震相预测扇体分布的盲目性，针对性的提出了基于地震多属性拟合技术编制粗粒扇体沉积相图的方法:1）建立岩性识别图版；2）属性优化与线性逐步回归拟合含砂砾率；3）均方根振幅属性正态分布约束砂体边界；4）应用拟合含砂砾率等值线图，结合岩相和测井相编制粗粒扇体沉积相图。并将该方法用于玛131井区百口泉组二段的沉积研究中，为研究粗粒扇体沉积提供了新的思路，为玛湖滚动勘探及井位论证提供了可靠地质依据。

Application of Multiple Seismic Attributes Matching Technology in Mapping Coarse-grain Fan Deposition: A case from Triassic Baikouquan Formation Member 2 in Ma 131 area

Due to the multiple types of conglomerate rock,strong reservoir heterogeneity,it is difficult to establish a relationship between seismic attributes and reservoir.Application of seismic attributes often leads to uncertainty and multiple solutions.In order to surmount the one sideness of single attribute reflecting the distribution of coarse-grain sediments,mutual interference between similar attributes-related information and blindness of seismic facies predicting the distribution of the fan body,a method based on seismic multi-attributes matching technology is proposed:1) established lithology identification scheme;2) sandy conglomerate ratio was matched based on an attribute optimization and linear regression;3) RMS attribute to constraining sand boundary;4) the coarse-grain fan sedimentary facies was mapped according to matching sand ratio contour,lithofacies and logging facies.And application of this method to Baikouquan Formation Member 2 in Ma 131 area shows that it is not only probiding a new way to study coarse-grain deposition,but also providing a reliable basis for rolling exploration and demonstration wells in Mahu sag.