沉积岩总有机碳样品处理中溶样时间对分析结果的影响探讨

The influence of sample dissolution time in total organic carbon analysis results of the sedimentary rocks

烃源岩的定性评价是烃源岩评价的重要组成部分。在其他条件相近的前提下,岩石中有机质丰度越高,其生烃能力越高。总有机碳含量(TOC)是国内外作为烃源岩有机质丰度评价应用最早,资料积累最多的一项指标,已形成一套较规范的烃源岩评价标准。目前,有机碳分析的国家标准中,未对溶样时间进行要求,本文重点针对分析过程中溶样时间进行比对试验。研究发现大部分烃源岩样品分析满足标准的质量要求。但是在面临致密油泥岩样品时,总有机碳样品处理过程中溶样时间的长短直接影响到分析结果的稳定性。分析认为,样品处理应在有效除掉无机碳影响的同时尽量缩短溶样时间,以减少对分析结果的影响。

Quantitative evaluation of hydrocarbon source rocks is an important part of the evaluation of hydrocarbon source rocks. In other conditions under the premise of similar rocks, the abundance of organic matter is higher, the higher the ability of hydrocarbon. The total organic carbon content（TOC）at home and abroad is used as the evaluation of source rock organic matter first, an index of the most data accumulation, has formed a set of source rock evaluation standard. At present, organic carbon analysis in the national standards for dissolution time requirements, this paper focuses on the analysis of the process of dissolution time comparison test. Most of the hydrocarbon source rock samples meet the requirements of the quality of the standard study. But in the face of tight oil and shale samples, total organic carbon samples in the process of dissolution time affects the stability of analysis results. The analysis thinks that sample treatment should be effective to remove inorganic carbon. In order to reduce the impact on the analysis results, sample treatment should shorten dissolution time.