摘要
裂缝是良好的油气储集空间,但是针对不同岩性组合储集层类型所产生的裂缝研究有所不足。济阳坳陷储集层按岩性可分为:砂岩-细粒岩组合型储集层、细粒岩组合型储集层、不同粒度砂岩储集层和基岩储集层。通过岩心观察和薄片分析,可知不同粒度砂岩对于细粒岩有着不同程度的影响,在相同应力条件下,砂岩随着粒度的变大,形变量也变大,与接触的刚性细粒岩应变差值也变大,裂缝的数量和大小会增大。同时砂岩相对于细粒岩厚度越大,对于与之相接触的细粒岩破坏程度和范围越大,细粒岩会发育出更多的裂缝,有利于改善储层的储集性能。断层经过的地层附近会产生大量的裂缝,形成有利的储集空间,对于四种类型的储集层的储集性能具有重要的改善意义。
Fractures are good oil and gas storage space,but the research on fracture caused by different lithologic combination reservoir types is insufficient.According to the lithology,the reservoirs in Jiyang depression can be divided into three types:sandstone fine-grained rock combination reservoir,fine-grained rock combination reservoir,sandstone reservoir with different granularity and bedrock reservoir.Through core observation and thin section analysis,it can be seen that different grain size sandstones have different degrees of influence on fine-grained rocks.Under the same stress condition,with the increase of grain size,the shape variable becomes larger,the strain difference between the contact rigid fine-grained rocks becomes larger,and the number and size of fractures increase.At the same time,the greater the thickness of sandstone relative to fine-grained rock,the greater the damage degree and scope of fine-grained rock in contact with it,the more fractures develop in fine-grained rock,which is conducive to improving the reservoir performance.There are a lot of fractures near the strata where the faults pass,forming favorable reservoir space,which is of great significance to improve the reservoir performance of four types of reservoirs.
作者
侯静宇
HOU Jing-yu(Department of Geology,Northwest University,Shaanxi Xi’an 710069,China)
出处
《辽宁化工》
CAS
2020年第2期166-169,共4页
Liaoning Chemical Industry
关键词
裂缝
岩性组合
储集层
断层
crack
lithological association
reservoir
fault
作者简介
侯静宇(1994-),男,硕士在读,陕西西安市人,研究方向:储层评价。
