论文部分内容阅读
应用岩心观察、X-衍射分析、薄片鉴定、扫描电镜、全岩矿物鉴定、岩心物性和含油级别分析测试等手段,揭示了渤南洼陷古近系碎屑岩储层中的黏土矿物特征及其与油气的密切关系。研究区黏土矿物主要为伊利石、伊-蒙混层、高岭石和绿泥石,垂向序列由下到上可分为伊利石—绿泥石发育带、高岭石异常高值带和伊利石—伊-蒙混层发育带3个变化带。不同阶段的黏土矿物主控因素差异导致黏土矿物的演化过程极其复杂,主要分为4个阶段:沉积期主要受沉积环境的影响,黏土矿物以伊利石和伊-蒙混层为主;有机质成熟期主要受成岩作用影响,在酸性成岩环境下高岭石大量产生;构造活动期受烃类侵位和深部流体的影响,在油气聚集区,高岭石得到保存,在岩浆活动区,绿泥石大量生成;油气成藏期受多种因素的影响,油层内的高岭石得到保存,油层外的高岭石转化为其他黏土矿物,出现了与油层对应的高岭石含量相对高值带。高岭石的相对高含量带是工业油层出现的重要标志。
The characteristics of clay minerals in the Paleogene clastic reservoirs in the Bonan sub-sag and the characteristics of clay minerals in the Paleogene clastic reservoirs in Bonan sub-sag are revealed by core observation, X-ray diffraction analysis, flake identification, scanning electron microscopy, whole rock mineral identification, core material properties and oil level analysis. Its close relationship with oil and gas. The clay minerals in the study area are mainly illite, illite-smectite, kaolinite and chlorite. The vertical sequence can be divided into illite-chlorite zone, kaolinite anomalous zone and illite - Iraq - Mongolia mixed zone development zone with three changes. The main controlling factors of clay minerals in different stages lead to the extremely complicated evolution process of clay minerals, which is mainly divided into four stages: the sedimentary period is mainly affected by the sedimentary environment, the clay minerals are illite and Iraqi-muddy layers, and the organic matter maturation is mainly Due to diagenesis, kaolinite is produced in a large amount under acidic diagenetic conditions. During the tectonic activity period, due to hydrocarbon emplacement and deep fluid, kaolinite is conserved in the hydrocarbon accumulation area. In the magmatic activity area, a large amount of chlorite The hydrocarbon accumulation period is affected by many factors. The kaolinite in the reservoir is preserved. The kaolinite outside the reservoir is transformed into other clay minerals, and the kaolinite content corresponding to the reservoir is relatively high. The relatively high content of kaolinite is an important indicator of the emergence of industrial reservoirs.