CAJ | 학술논문

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。
재박편、X사선연사화소묘전경분석기출상,연구료악이다사분지화경지구장6유층조사암중점토광물적주요류형、부존방식급기대저층물성적영향。결과표명：장6유층조사암중적점토광물주요위록니석、이리석화혼층이리석/몽조석,점토광물총량평균위4.55%;자생록니석주요이공극츤리방식산출,대심매장사암적저집공간구유현저적보호작용;이리석화혼층이리석/몽조석주요이공극교접혹공극충전방식산출,기대량존재회도새공극후도、감소공후반경,종이대저층물성산생부면영향;고령석재화경지구장6유층조사암중불발육,시유우고함량잡기도치장6유층조사암재산성류체출현지전이기본완성압실작용,차장7경원암유궤질연화과정중산생적산성류체대기영향십분유한,사기결핍족구적립간공극화활약적산성류체침정고령석。
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.