论文部分内容阅读
综合利用岩心、薄片、扫描电镜、压汞测试等资料,将研究区东河砂岩划分为4种宏观储层和3种微观储层,对不同水淹程度下宏观储层性质变化及微观机理进行研究.研究后认为东河砂岩Ⅰ~Ⅲ类宏观储层物性、泥质质量分数、驱油效率在不同水淹阶段变化规律不同,而微观变化对宏观变化有控制作用,各宏观储层变化均为3种微观储层变化相叠加的结果,常见一种微观储层为主控因素,其余为影响因素.研究结果表明:水淹后,对于平均孔隙度,Ⅰ~Ⅲ类储层先减小后缓慢增大,最终平均减小2.8%;对于平均渗透率,Ⅰ~Ⅱ类储层先增大再减小、随后显著增大,最终平均增加59.3%,Ⅲ类储层先减小再增大,最终增加96.6%;对于储层泥质质量分数,Ⅰ~Ⅱ类储层先减小再增大、随后再减小,最终平均减小0.63%,Ⅲ类储层先增大再减小,最终减小10.8%;对于驱油效率,Ⅰ类储层逐渐减小、最终降低21.1%,Ⅱ类储层逐渐增大、最终增大13.0%,而Ⅲ类储层先减小后增大、最终增大5.8%.微观机理方面,Ⅰ~Ⅲ类储层物性、泥质质量分数变化主控因素分别为中孔中喉、中孔细喉、细孔细喉微观储层性质变化,其影响因素各不相同.
According to the data of core, thin slice, SEM and mercury intrusion, the paper divided the Donghe sandstones in the study area into four kinds of macro-reservoirs and three kinds of micro-reservoirs. The change of macro-reservoir properties and microscopic mechanism under different flooding degrees After the study, it is concluded that the macroscopic physical properties, muddy mass fraction and flooding efficiency of Ⅰ ~ Ⅲ macropores in Donghe sandstone vary with different water flooding stages, while the microcosmic changes have a controlling effect on the macroscopic changes. As a result of superposition of the changes of three kinds of micro-reservoirs, a micro-reservoir is the main controlling factor and the rest are the influencing factors.The results show that for the average porosity, the Ⅰ ~ Ⅲ type reservoirs decrease first after flooding And finally decreased by an average of 2.8%. For the average permeability, the type Ⅰ ~ Ⅱ reservoirs first increased and then decreased, and then increased significantly, eventually increasing by 59.3% on average, and the type Ⅲ reservoirs first decreased and then increased Large and eventually increased by 96.6%. For the shale mass fraction, the reservoirs of Ⅰ ~ Ⅱ type first decrease and then increase, and then decrease, finally decreasing 0.63% on average, and the Ⅲ type reservoir first increases and then decreases , And finally decreased by 10.8%. For oil displacement efficiency, the type Ⅰ reservoir gradually decreases and eventually decreases 21.1%, type Ⅱ reservoir gradually increased, and finally increased 13.0%, while type Ⅲ reservoir first decreased and then increased, eventually increasing 5.8% .Micro mechanism, Ⅰ ~ Ⅲ reservoir physical properties, clay quality The main controlling factors of the change of foci were the changes of the nature of micro-reservoirs in the mesopore middle throat, mesopore throat and microporous throat, and the influencing factors varied.