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20多年来,在珠江口盆地惠州凹陷及邻区发现了一批油气田和含油气构造。原油的生物标志化合物分析结果表明,惠州凹陷及邻区原油可分为3类:Ⅰ类原油主要来源于文昌组中深湖相烃源岩,具有高的C304-甲基甾烷和低的双杜松烷含量;Ⅱ类原油主要来源于恩平组烃源岩,具有高的双杜松烷和低的C304-甲基甾烷含量;Ⅲ类原油为文昌组中深湖相烃源岩和恩平组烃源岩混合来源,C304-甲基甾烷和双杜松烷含量均较高。从平面分布看,Ⅰ类原油主要分布于远离凹陷的凸起区;Ⅱ类原油主要分布于惠州凹陷内恩平组烃源岩发育的地区;Ⅲ类原油分布于惠州凹陷内文昌组中深湖相和恩平组烃源岩共同发育的地区。从纵向分布看,Ⅰ类原油主要分布于浅层的韩江组和珠江组;Ⅱ类原油主要分布于中深层的恩平组和珠海组;Ⅲ类原油在珠海组、珠江组和韩江组均有分布。
For more than 20 years, a number of oil and gas fields and petroleum-bearing structures have been discovered in the Huizhou depression and adjacent areas of the Pearl River Mouth Basin. The results of biomarker analysis of crude oil show that the crude oil in Huizhou Sag and its adjacent areas can be divided into three types: Class Ⅰ crude oil mainly comes from the Wenchang Formation source rocks of middle-deep lacustrine facies, with high C304-methylstestane and low double Grade Ⅱ crude oil is mainly derived from the Enping Formation source rock with high content of dicudonane and low content of C304-methylstestane; Type Ⅲ crude oil is the source rocks of the Wenchang Formation in the middle-deep lacustrine facies and Enping Formation source rock mixed sources, C304-methyl sterane and two-juniperine content were higher. From the plane distribution, Class Ⅰ crude oil is mainly distributed in the salient areas far away from the depression; Class Ⅱ crude oil is mainly distributed in the areas where the Neoen Formation source rocks are developed in Huizhou depression; Ⅲ types of crude oil are distributed in the middle-deep lake of Wenchang Formation in Huizhou Depression And Enping Formation source rock co-development areas. From the longitudinal distribution, Class Ⅰ crude oil is mainly distributed in the shallow Hanjiang Formation and Zhujiang Formation; Grade Ⅱ crude oil is mainly distributed in Enping Formation and Zhuhai Formation in the middle and deep layers; Ⅲ type crude oil is distributed in Zhuhai Formation, Zhujiang Formation and Hanjiang Formation All have distribution.