多芳烃参数定量评价烃源岩成熟度的方法——以银额盆地中生界烃源岩为例

Quantitative assessment of source rock maturity with multiple aromatic parameters: a case study of Mesozoic source rocks in Yingen-Ejinaqi Basin

陈治军 张亚雄 王永昌 王希 葛宏选 高志亮 李子梁

CHEN Zhijun ZHANG Yaxiong WANG Yongchang WANG Xi GE Hongxuan GAO Zhiliang LI Ziliang

长江大学 资源与环境学院, 武汉 430100 陕西延长石油(集团)有限责任公司 研究院, 西安 710075 中国石化 石油勘探开发研究院, 北京 100083 中国石油集团 渤海钻探工程有限公司 定向井分公司, 天津 300280

College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China Reseach Institute of Yanchang Petroleum (Group) Co. Ltd., Xi'an, Shaanxi 710075, China SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China Directional Drilling Company, Bohai Drilling Company, CNPC, Tianjin 300280, China

芳烃成熟度参数被广泛应用于评价烃源岩或原油成熟度，但实际上生源特征、沉积环境等因素对一些参数的影响可能大于成熟度的控制，导致一些参数在某些研究区的应用效果并不理想，且前人基于单一参数建立的计算视镜质体反射率（Rc）的关系式也并不适用于所有研究区，因此，探索出了一种芳烃参数定量评价烃源岩成熟度的方法。该方法基于研究区一定数量的烃源岩芳烃组分的色谱—质谱（GC-MS）分析数据，通过开展各芳烃成熟度参数与Ro的相关性分析，分别在烷基萘系列、烷基菲系列和烷基二苯并噻吩系列3大类芳烃成熟度参数中找出1个对成熟度最敏感（相关系数最大）的参数，利用数值分析软件对这几个参数和Ro进行多元线性回归，拟合出一个利用多参数定量计算Rc的关系式。该方法在银额盆地哈日凹陷中生界湖相混合型（有机质类型以Ⅱ1—Ⅱ2型为主）烃源岩研究中取得了很好的应用效果。用该方法拟合出的关系式计算的Rc与Ro的相关系数R2高达0.96，相对于单一芳烃参数，相关系数有了大幅度的提高，表明该方法具有可靠性。

Aromatic parameters have been widely applied to assess the maturity of organic matters. Some parameters may not only be affected by maturation, but also more affected by organic matter source, sedimentary environment, etc. Therefore, the application effect of some parameters in some study areas were not satisfying, and the previous relational expression to calculate the vitrinite reflectance (Rc) which only based on a single parameter is also not suitable for other areas. In this study, we proposed a method to improve the accuracy of using multiple aromatic parameters to quantitatively evaluate source rock maturity. This method was based on a certain number of GC-MS analysis data of aromatic fractions of source rocks in the study area, to find out a most sensitive parameter to maturity in three categories of aromatics (alkyl naphthalene series, alkyl phenanthrene series and alkyl dibenzothiophene series) respectively. Here the most sensitive parameter meant having the largest correlation coefficient to Ro in certain category. Then a multiple linear regression equation was established among these three parameters and Ro using a numerical analysis software, and with this equation Rc can then be calculated with multiple parameters. This method is applied to the study of Mesozoic lacustrine source rocks in the Hari Sag of Yingen-Ejinaqi Basin, the organic matter types of these source rock are mainly type Ⅱ1-Ⅱ2. The results indicated that the correlation coefficient (Rc) between Ro and Rc which was calculated by established formula was as high as 0.96, and compared with the single aromatics parameter, the correlation coefficient has been considerably improved.

国土资源部重点项目“十三五全国油气资源评价” 2017YQZYPJ01;延长集团科技攻关项目“银额盆地哈日凹陷主力烃源岩生烃特征与资源潜力分析” ycsy2020jcyjB-03

https://doi.org/10.11781/sysydz202201139