摘要
岩石热解可快速提供总有机碳含量(TOC)等表征有机质丰度的指标,是页岩气评价的重要技术手段之一,但页岩岩石热解测定中发现有TOC数据存疑的问题。本次通过不同岩性样品,研究称样量对热解测定TOC的影响,并确定合理的称样量范围。结果表明:对于TOC含量较高的样品(w(TOC_(QC34))=16.82%),称样量需小于92.1 mg,否则热解测定TOC会低于真实值;对于TOC含量较低的样品(w(TOC_(QC03))=0.33%;w(TOC_(QC05))=0.54%),若称样量低于54.2 mg,将无法获得稳定的TOC数据;对于中等有机质丰度的样品(w(TOC_(QC30))=1.42%;w(TOC_(IFP160000))=3.28%),在14.4~94.7 mg的称样范围内,均能获得满意的测试结果。
Rock pyrolysis can quickly provide TOC and other indicators to characterize the abundance of organic matter and is commonly regarded as one of the most important technical means for shale gas evaluation.However,for some shale rocks,the TOC data determined by rock pyrolysis is questionable.A suit of samples with different lithology were used to study the effect of sample weight on rock-eval TOC parameter.The results indicate that the sample weight should be less than 92.1 mg for the shale samples with high TOC content(w(TOC_(QC34))=16.82%),otherwise the TOC value determined by pyrolysis will be lower than the true value.With regard to the shale samples with low TOC content(w(TOC_(QC03))=0.33%;w(TOC_(QC05))=0.54%),stable TOC data cannot be obtained if the sample weight is less than 54.2 mg.As to the shale samples with moderate organic matter abundance(w(TOC_(QC30))=1.42%;w(TOC_(IFP160000))=3.28%),rock pyrolysis accompanied by a much wider range of sample weight(14.4 to 94.7 mg)can provide accurate TOC data.
作者
徐学敏
杨佳佳
孙玮琳
沈斌
张小涛
秦婧
栗敏
许智超
胡才志
郭望
XU Xuemin;YANG Jiajia;SUN Weilin;SHEN Bin;ZHANG Xiaotao;QIN Jing;LI Min;XU Zhichao;HU Caizhi;GUO Wang(National Research Center for Geoanalysis,Beijing 100037,China;Xi'an Center of Geological Survey,China Geological Survey,Xi'an 710054,China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第4期22-29,共8页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金项目(41702159)
地质调查项目(DD20221783,DD20190086)
国家地质实验测试中心基本科研业务费项目(CGZH-2021-01,CSJ-2021-04,CSJ-2022-06)。
关键词
岩石热解
页岩
总有机碳
称样量
rock pyrolysis
shale
total organic carbon
sample weight
