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油气储集层的非均质性是一种普遍特性。随着我国岩性油气藏的不断发现,储集层的非均质性研究显得尤为重要,弄清储集层非均质性与含油气性的关系,有助于在我国普遍存在的致密储集层中发现更多的富集区。通过对我国含油气区地质条件综合分析,指出碎屑岩类储集层非均质性成因主要有沉积作用、成岩作用和构造改造作用,沉积作用和成岩作用主要是由于沉积相变化和成岩演化导致碎屑岩类储集层物性在空间上的差异,构造改造作用主要是储集层由于构造作用的不均衡性,导致同一储集层非均质性的发育;进行的不同物性储集层含油气性物理模拟实验结果表明,碎屑岩类储集层表现出的非均质性影响到其含油气性,相对高孔渗的砂体有利于油聚集,而天然气充注并非都在高孔渗砂体中,低孔渗砂岩储集层仍然可以具有较高的含气饱和度,这主要是由于天然气在不同孔喉砂体充注效应差异引起。
Heterogeneity of oil and gas reservoirs is a common feature. With the continuous discovery of lithologic reservoirs in our country, it is very important to study the heterogeneity of reservoirs. Understanding the relationship between reservoir heterogeneity and hydrocarbon-bearing property is of great help to the development of tight reservoirs Set of layers to find more enrichment area. Based on the comprehensive analysis of the geological conditions in the oil-bearing areas in China, it is pointed out that the heterogeneity of clastic reservoir is mainly caused by sedimentation, diagenesis and tectonic remodeling. Sedimentation and diagenesis are mainly caused by sedimentary facies and diagenetic evolution Resulting in the difference of physical properties of clastic rock reservoirs in space. The main effect of tectonic remodeling is the imbalance of reservoir structure due to the structural effect, leading to the heterogeneity of the same reservoir. The different physical reservoirs Hydrocarbon-bearing physical simulation results show that the heterogeneity of clastic reservoir affects its oil and gas content, and the relatively high porosity and permeability sand bodies are favorable for oil accumulation, while natural gas charge is not all high Permeable sand bodies, low porosity and permeability sandstone reservoirs can still have high gas saturation, mainly due to the difference in filling effect of natural gas in different pore throat sand bodies.