储层成岩数值模拟研究现状及进展

State quo of reservoir diagenetic numerical simulation and its advancement

从储层成岩环境参数、物理化学作用和孔隙度演化3个方面进行数值模拟研究.通过对层序地层格架/沉积微相框架下的成岩数值模拟研究、不同时期流体与岩石相互作用下的效应数值模拟研究、沉积模拟和成岩作用模拟相结合的成岩数值模拟研究、成岩物理模拟和成岩数值模拟的融合研究、基于构造-沉积-成岩相融合的成岩数值模拟研究,阐述了成岩数值模拟技术包括基于成岩环境参数研究的储层成岩相演化预测、基于流体-岩石相互作用的物理化学作用、基于沉积模拟和成岩作用模拟相融合的成岩数值模拟和基于成岩作用的储层响应特征.研究结果表明:1)正演盆地模拟和成岩作用模块相互耦合的孔隙度演化模拟技术,重现孔隙演化过程,可准确地评价出孔隙度空间差异性,评价出低渗-致密储层"甜点"空间分布;2)流体-岩石相互作用下的效应数值模拟,研究地质体矿物组分空间差异性条件下的流体-岩石相互作用,揭示储层"溶蚀次生孔隙"型和"原生+溶蚀"型"甜点"的成因机制及响应特征;3)分级次、分类型、按照不同尺度构造-沉积-成岩"三相"融合的成岩数值模拟一体化技术,可评价出低渗-致密储层"甜点"空间分布、控制因素和油气富集规律.

Numerical simulation studies were conducted from 3 aspects which are environmental parameters of reservoir formation,physical-chemical interaction and porosity evolution.Based on the diagenetic numerical simulation study constrained by the sequence stratigraphic framework and sedimentary microfacies framework,diagenetic result numerical simulation study of the fluid-rock interaction result in different periods,diagenetic numerical simulation study on the combination of sedimentary and diagenesis simulation,integration study of diagenetic physical simulation and numerical simulation,diagenetic numerical simulation of structure,deposition and diagenesis integration,the diagenetic numerical simulation technologies were elaborated,including diagenetic facies evolution and distribution prediction based on diagenetic environment parameters,physical-chemical reactions of fluid-rock interaction,numerical simulation study on the combination of sedimentary and diagenetic simulation,and reservoir diagenetic response characteristics.The results show that 1） porosity evolution simulation technology based on the integration of forward basin simulation and diagenetic module can reproduce the porosity evolution,and precisely evaluate the diversity of porosity space and spatial distribution of lowpermeability tight reservoir ＆quot;sweet spot＆quot;;2） diagenetic result numerical simulation of the fluid-rock interaction under different geological minerals spatial distribution can reveal genetic mechanism and response characteristic of the reservoir ＆quot;sweet spot＆quot; of ＆quot;secondary dissolution pore＆quot; type and ＆quot;primary ＋ dissolution＆quot; type;3） the ＆quot;three-phase＆quot; structure-deposition-diagenesis facies integration technology constructed on the course of classification,types and different scals can evaluate the spatial distribution of low permeability tight reservoir ＆quot; sweet spot＆quot;,its controlling factors and hydrocarbon enrichment regularity.