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惠州凹陷是珠江口盆地的主要油气贡献区之一,进一步落实烃源岩特征和油气资源量对于富烃凹陷研究具有重要意义.通过对烃源岩的有机质丰度、类型、成熟度、有效厚度、有机碳恢复系数和产烃率的综合分析可知,惠州凹陷古近系上、下文昌组和恩平组均为好的烃源岩.烃源岩TOC体定量预测技术弥补了烃源岩取心少、实测样品分布不连续的不足,定量预测了不同深度和不同时间平面上的烃源岩TOC含量及变化特征,为更加准确的评价烃源岩及油气资源量奠定了良好的基础.基于TOC体定量预测技术,以三级层序为基本地层单元,采用成因法计算出惠州凹陷古近系烃源岩的油气资源总量为前一次的1.698倍,与其紧邻的古近系构造转换带,具有近源供烃的优势,显示了较大的勘探潜力.
Huizhou Sag is one of the major oil and gas contributing areas in the Pearl River Mouth Basin, and further implementation of the characteristics of source rocks and oil and gas resources is of great significance for the study of hydrocarbon-rich depressions.Based on the analysis of organic matter abundance, type, maturity, effective thickness , Organic carbon recovery coefficient and hydrocarbon production rate of the comprehensive analysis shows that the Huizhou Sag Paleogene, the Lower Wenchang Formation and Enping Formation are good source rocks. TOC source rock quantitative prediction technology to make up for the source rocks to take Less heart and less sample distribution. The TOC content and variation characteristics of source rocks in different depths and time scales are quantitatively predicted, which lays a good foundation for more accurate evaluation of source rocks and hydrocarbon resources. TOC volumetric quantitative prediction technology, the third-order sequence as the basic stratigraphic unit, using genesis method to calculate the total oil and gas resources in the Paleogene source rock in Huizhou Sag 1.698 times the previous, with its adjacent Paleogene structural transformation belt , With the advantages of near source for hydrocarbon, showing a great exploration potential.