摘要
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。
Reservoir bed heterogeneity is a widespread feature. With the finding of lithologic hydrocarbon reservoirs in our country, the research of heterogeneity of reservoirs becomes particularly important, and finding out the relationship between reservoir heterogeneity and oil-gas possibility contributes to the dis- covery of more oil and gas enrichment regions in tight reservoirs in China. By comprehensively analyzing the geologic setting of oil and gas enrichment region in our country,we point out that the formation of heterogeneity of elastic rock reservoirs is mainly affected by deposition, diagenesis and tectonic reconstruction. The deposition and diagenesis is mainly due to the change of sedimentary facies and diagenetic evolution, and the tectonic reconstruction is mainly due to the imbalance of the late reservoir reconstruction, leading to the development of heterogeneity in the same reservoir bed. Physical simulation experiments of the oil/gasbearing possibility of reservoir with different physical properties showed that the heterogeneity of elastic rock reservoir affects its oil/gas-bearing possibility, and the sand body with relatively higher permeability and porosity is beneficial to oil accumulation,but not all the gas will charge into the sand body with relatively higher permeability and porosity, low permeability sandstone reservoir can still have high gas saturation,this is mainly due to the natural gas filling difference in different pore-throat sand body.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2015年第4期608-615,共8页
Natural Gas Geoscience
基金
国家重大科技专项(编号:2011ZX05003)
中国石油天然气股份有限公司项目(编号:2011B-04
2011A-02)
中国石油勘探开发研究院项目(编号:2011Y-004)联合资助
关键词
储集层
非均质性
含油气性
渗透率级差
物理模拟
Reservoir bed
Heterogeneity
Oil/gas-bearing possibility
Permeability difference
Physical simulation
