Research on carbonate reservoir matrix model building based on porosity cycles

Reservoir modeling refers to many technologies, and the improvements on any of which will affect model accuracy. Despite that digenesis and tectonic factors have made carbonate reservoirs become complicated and heterogeneous, for pore or cave layer carbonate reservoirs connected by extensional fractures, the distribution of pore or cave layers has regularity and cyclicity. Taking a gas reservoir in the Sichuan Basin as an example, porosity cycle is put forward as a model unit to build up carbonate reservoir matrix geological model. Porosity cycles are divided based on the change law of porosity curves. Then with these porosity cycles, combining deterministic modeling with stochastic simulation, carbonate reservoir matrix geological model is developed to increase reservoir modeling precision.