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恩平组烃源岩成藏贡献研究对于拓展珠Ⅰ坳陷勘探新领域以及发现新的储量具有重要的应用价值,目前相关研究较少.在油源对比的基础上,将生标绝对含量与端元油配比实验相结合,研究了珠Ⅰ坳陷恩平组烃源岩对单井油样的相对贡献.油源对比结果指示,研究区原油可分为3类:第1类源自始新统文昌组中深湖相烃源岩,主要分布在惠陆低凸起、番禺4洼、流花凸起等地区;第2类源自始新统-渐新统恩平组湖沼相烃源岩,仅分布在惠州凹陷北部;第3类为混源油,发现于惠州凹陷南部和恩平凹陷.甾萜类绝对含量等7个指标建立的混源比例图版适用于计算油样中前两类烃源岩的相对贡献.计算结果表明,文昌组烃源岩是珠Ⅰ坳陷的主力烃源岩,恩平组烃源岩仅对惠州凹陷和恩平凹陷中的部分油样存在贡献.
The research on the contribution of the Enping Formation source rock to hydrocarbon accumulation has important application value in exploring new exploration areas and discovering new reserves in the Zhu Ⅰ Depression.At present, there are few related studies.On the basis of oil source contrast, Oil-oil ratio experiment, we studied the relative contribution of the Enping Formation source rocks to the single-well oil sample in the Zhu Ⅰ depression.The results of oil source comparison indicate that the crude oil in the study area can be divided into three types: The Neogene Wenchang Formation is a middle-deep lacustrine source rock mainly distributed in the areas of Hulu low protuberance, Panyu 4 depression and Liuhua protuberance. The second type is derived from source rocks of Eocene-Oligocene Enping Formation, Rock, only distributed in the north of Huizhou depression; the third category is mixed source oil, found in the southern Huizhou depression and Enping depression. The absolute content of the total amount of steroidal terpenoids and other indicators established by the mixed source version of the map is suitable for calculating the first two samples The relative contribution of hydrocarbon source rocks is calculated.The results show that Wenchang Formation source rock is the main source rock in Zhu Ⅰ depression and Enping Formation source rock only contributes to some oil samples in Huizhou Sag and Enping Sag.