页岩油烃源岩地化参数测井评价方法及应用

Evaluation Method and Application for Geochemical Parameters of Shale Oil Source Rock

测井资料进行烃源岩识别与有机碳含量评价已得到广泛应用,但由于有机碳含量的计算精度不高且其他地化参数测井定量评价方法相对空缺,烃源岩测井综合评价体系还不完善。基于烃源岩测井响应特征分析,建立有机碳含量、生烃潜率、氯仿沥青“A”、镜质体反射率这4种地化参数的多套测井定量评价模型,创新提出改进的ΔlogR法、细分岩性法计算有机碳含量,有效提高计算精度。以鄂尔多斯盆地陇东地区延长组长73烃源岩为例,精细构建研究区烃源岩测井评价参数体系,同时基于烃源岩品质综合评价指数,建立研究区长73烃源岩分类评价标准,为后续“甜点”评价提供技术支持。

The application of logging data for source rock identification and organic carbon content evaluation has been widely used,but the calculation accuracy of organic carbon content is low and the quantitative evaluation methods of other organic geochemical parameters are relatively lacking,the comprehensive evaluation system of source rock logging is not yet available complete.Based on the analysis of the logging response characteristics of source rocks,establishes multiple sets of quantitative evaluation models for four kinds of geochemical parameters,such as organic carbon content,hydrocarbon potential rate,chloroform bitumen“A”,vitrinite reflectance.Various algorithms such as the improvedΔlogR method and the subdivision lithology method are proposed for the calculation of organic carbon content.Taking the Chang 73 source rock in the Longdong area Yanchang formation of the Ordos basin as an example,the log evaluation parameter system of the source rock is constructed.Based on the comprehensive evaluation index of source rock quality,the classification evaluation standard of Chang 73 source rock is established,which provides technical support for the subsequent“sweet spot”evaluation.