长庆油田长7段黏土矿物X衍射分析K因子的求取及应用

发布时间：2018-01-26 03:58

本文关键词： 黏土矿物 K因子 X衍射分析长段泥页岩鄂尔多斯盆地　出处：《沉积学报》2017年04期 　论文类型：期刊论文

【摘要】：过去一直被认为是烃源岩的长7段泥页岩,目前被证实可以作为页岩油储层,这就使得定量分析长7段岩石中各类黏土矿物含量变得十分重要。由于不同地区黏土矿物结晶程度存在差异,导致传统X衍射定量分析的行业标准并不具有普适性,因此要精确测量长7段黏土矿物含量,就需要针对研究区具体情况,实测一套符合该区情况的K因子。利用X衍射定量分析中的K因子法,以石英为内标物,求取长7段岩石中各类黏土矿物的K因子,进而计算出了各矿物的含量。此外,通过X荧光光谱矿物化学配平以及热重分析两种方法对相应样品进行了黏土矿物的定量和半定量分析,进一步验证了K因子的正确性,分析结果与利用K因子法获得的矿物含量具有较好的一致性。所求取的K因子,对今后该区域利用X射线衍射法定量分析黏土矿物含量提供了基础参数,从而可以促进判断页岩的岩性、对比不同岩性岩石中单矿物含量及变化关系等方面的研究。
[Abstract]:Chang 7 shale, which has been considered as source rock in the past, has been proved to be a shale oil reservoir. This makes it very important to quantitatively analyze the mineral content of various clay minerals in the rock of Chang 7 because of the difference in the degree of crystallization of clay minerals in different regions. The industry standard which leads to the traditional quantitative analysis of X diffraction is not universal, so it is necessary to measure the clay content accurately in the study area in order to measure the clay content accurately. A set of K factors in accordance with the situation in this area were measured. Using the K factor method in quantitative analysis of X ray diffraction, using quartz as internal standard, the K factor of all kinds of clay minerals in the rocks of the 7 member rocks was obtained. In addition, quantitative and semi-quantitative analysis of clay minerals were carried out by means of X-ray fluorescence spectrum mineral chemical leveling and thermogravimetric analysis. Furthermore, the correctness of K factor is verified, and the analytical results are in good agreement with the mineral content obtained by K factor method. It provides the basic parameters for the quantitative analysis of clay mineral content by X-ray diffraction method in the future, which can help to judge the lithology of shale. The study of single mineral content and variation relationship in different lithologic rocks is compared.
【作者单位】：北京大学造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院;中国石油天然气股份有限公司长庆油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计(973计划)项目(2012CB214801)~~
【分类号】：P618.13
【正文快照】： 近年来随着勘探工作的深入,研究者发现长7段泥岩中含有丰富的油气资源[1-3]。在2012年,耿295井在长72油页岩段射孔试油获日产纯油20.5吨的高产工业油流,预示长7页岩油具有良好的勘探潜力,引起了人们对于鄂尔多斯盆地长7段页岩油的重视,因此对这一层位的岩石学研究变得极为重要

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