大型河流──三角洲沉积储层精细描述方法

METHODS FOR DETAILED DESCRIPTION OF LARGE FLUVIAL-DELTA DEPOSITIONAL RESERVOIR

概括地论述了大庆油田应用现代沉积和露头研究中的层次分析思想和自创的模式预测描述法，成功地研制出依据油田密井网测井资料和大型河流—三角洲特有的沉积规律与模式，由大到小、由粗到细分层次逐级解剖砂体几何形态和内部建筑结构，精细地建立储层地质模型，系统描述储层宏观非均质体系的研究方法。该方法将整套储层划分为岩相段、单一族回层（或单砂层）、沉积微相（或相对均质单元）、单砂体、建筑结构单元、层内非均质等6个描述层次，并对砂体井间连续性、几何形态与边界位置、厚度与渗透率的平面非均质性采用模式化预测性描述，较好地解决了储层复杂非均质体系描述和井间砂体预测的难题。

This paper elaborates the research method for establishing geological model and systematic description of reservoir macro-heterogeneity system. Taking advantage of the research logic of hierarchical levels analysis from modern deposition and outcropstudy, and the new description method of 'deposition pattern predicting', utilizing the density well pattern logging curves data,and guided by distinct deposition rules of large fluvial-delta, sandbody geometry and interior architecture are dissected based onthe heterogeneity levels from large to small. Heterogeneity is divided into six levels for description including lithfacies section,single cycle (single layer), microfacies (or relative homogeneous unit), single sandbody, architectural element, and interior het-erogeneity. Also, sandbody heterogeneity such as the inter-wells continuity, geometry, boundary, thickness and permeabilitypattern are explained in detail.