基于岩石热解资料的烃源岩有机碳构成计算方法及应用  

Calculation Method and Its Application of Organic Carbon Composition of Source Rock Based on Rock Pyrolysis Data

作　　者：李永会[1] 刘刚[1] 高亮[1] 向娟[1] 宋海强 胡元伟 王青[1] Li Yonghui;Liu Gang;Gao Liang;Xiang Juan;Song Haiqiang;Hu Yuanwei;Wang Qing(PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;International Energy Chemical Co.,Ltd.,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi′an,Shaanxi 710061,China)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]陕西延长石油国际能源化工有限公司,陕西西安710061

出　　处：《特种油气藏》2022年第2期51-56,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“稠油火驱提高采收率技术研究与应用”(2016ZX05012-003);中国石油科技重大专项“原油重大开发试验专题研究”(ks2020-01-01)。

摘　　要：随着热演化程度的提高,烃源岩中有机碳的丰度和组成持续变化。为研究有机碳组成的变化规律,提出了“有机碳构成”概念,并建立了基于岩石热解参数计算烃源岩残余有效碳相对含量、残余无效碳相对含量、原始有效碳相对含量和原始无效碳相对含量的方法。该方法基于低成本的岩石热解分析,能够快速定量计算各类烃源岩的有机碳构成。将该方法应用于银额盆地中生界低成熟和古生界过成熟烃源岩的有机碳构成研究,取得了很好的应用效果。应用结果表明:对于低成熟烃源岩,残余有机碳构成与原始有机碳构成相比变化不大,有效碳的占比仅有小幅度的减小,而无效碳的占比也只有小幅度的增加,表明低成熟烃源岩成烃转化率小,仅有少量有效碳转化为烃类;而过成熟烃源岩有效碳的生烃转化率极高,绝大部分残余有机碳为不可热解的“死碳”,而有效碳仅占极小的一部分。该方法实现了对烃源岩有机碳构成的研究从定性到定量的提升,可为烃源岩有机碳热演化特征等研究提供依据。The abundance and composition of organic carbon in source rocks continue to change with the increase of thermal evolution.In order to study the change rule of organic carbon composition,the concept of“organic carbon composition”was proposed,and a method was developed to calculate the relative contents of residual effective carbon,residual ineffective carbon,original effective carbon and original ineffective carbon in source rocks based on rock pyrolysis parameters.Based on low-cost rock pyrolysis analysis,this method can calculate the organic carbon composition of various source rocks in a fast and quantitative manner.This method was applied to the study of organic carbon composition of low-mature Mesozoic and post-mature Paleozoic source rocks in Yin′gen-Ejinaqi Basin,and achieved outstanding results.The results showed that for the low-mature source rocks,the residual organic carbon composition was not changed much compared with the original organic carbon composition,and the proportion of effective carbon only decreased slightly,while the proportion of ineffective carbon only increased slightly,indicating that the hydrocarbon conversion rate of low-mature source rocks was low,and only a small amount of effective carbon was converted to hydrocarbons;for the post-mature source rocks,the hydrocarbon conversion rate of effective carbon was extremely high,and most of the residual organic carbon was non-pyrolysable“dead carbon”,while only a very small proportion of effective carbon was converted to hydrocarbons.This study has realized the improvement of studies on organic carbon composition of source rocks from qualitative to quantitative,and can provide a basis for the study of thermal evolution characteristics of organic carbon in source rocks.

关 键 词：岩石热解 热演化特征 有机碳构成 低成熟烃源岩 过成熟烃源岩 

分 类 号：TE122.1[石油与天然气工程—油气勘探]