华庆地区长6 油层组黏土矿物类型及其对储层物性的影响
网络出版日期: 2012-06-20
基金资助
国家科技重大专项“鄂尔多斯盆地中生界延长组储层特征研究”(编号:2008ZX05001-004-003)资助
Types of clay minerals and its effects on reservoir properties of Chang 6 oil reservoir set in Huaqing area, Ordos Basin
Online published: 2012-06-20
在薄片、X 射线衍射和扫描电镜分析基础上,研究了鄂尔多斯盆地华庆地区长6 油层组砂岩中黏土 矿物的主要类型、赋存方式及其对储层物性的影响。结果表明:长6 油层组砂岩中的黏土矿物主要为绿 泥石、伊利石和混层伊利石/蒙皂石,黏土矿物总量平均为4.55%;自生绿泥石主要以孔隙衬里方式产出, 对深埋藏砂岩的储集空间具有显著的保护作用;伊利石和混层伊利石/蒙皂石主要以孔隙桥接或孔隙充填 方式产出,其大量存在会堵塞孔隙喉道、减小孔喉半径,从而对储层物性产生负面影响;高岭石在华庆地 区长6 油层组砂岩中不发育,是由于高含量杂基导致长6 油层组砂岩在酸性流体出现之前已基本完成压 实作用,且长7 烃源岩有机质演化过程中产生的酸性流体对其影响十分有限,使其缺乏足够的粒间孔隙 和活跃的酸性流体沉淀高岭石。
窦宏恩 . 华庆地区长6 油层组黏土矿物类型及其对储层物性的影响[J]. 岩性油气藏, 2012 , 24(3) : 66 -73 . DOI: 10.3969/j.issn.1673-8926.2012.03.013
Based on thin section analysis, X-ray diffraction and scanning electronic microscope analyses, this paper studied the types, occurrence of clay minerals and its influence on reservoir properties of Chang 6 oil reservoir set in Huaqing area. The result shows that the clay minerals in Chang 6 oil reservoir set mainly consist of chlorite, illite and illite/smectite mixed layer, and the average content of clay minerals is approximately 4.55% . Authigenic chlorite commonly occurs as pore-lining cement, which is beneficial to protect porosity of deeply buried sandstones. The occurrence of illite and illite/smectite mixed layer is pore bridging or pore filling, which will block up pore spaces and reduce throat radius, and have negative effect on sandstone reservoir. Authigenic kaolinite in Chang 6 oil reservoir set in Huaqing area is not developed. High matrix content makes the reservoir experience intense compaction earlier than acidic fluid, and the influence of acidic fluid from Chang 7 hydrocarbon rocks is limited for Chang 6 oil reservoir set, both of them result in the lack of intergranular volume and active acidic fluid for kaolinite.
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