State quo of reservoir diagenetic numerical simulation and its advancement

LIN Chengyan; WANG Wenguang; DONG Chunmei; ZHANG Xianguo; REN Lihua; SHI Xiangfeng

Abstract：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 "sweet spot";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 "sweet spot" of "secondary dissolution pore" type and "primary + dissolution" type;3) the "three-phase" 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 " sweet spot",its controlling factors and hydrocarbon enrichment regularity.