CAJ | 학술논문

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C_(30)4-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C_(30)4-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,C_(30)4-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.
20다년래,재주강구분지혜주요함급린구발현료일비유기전화함유기구조.원유적생물표지화합물분석결과표명,혜주요함급린구원유가분위3류:Ⅰ류원유주요래원우문창조중심호상경원암,구유고적C_(30)4-갑기치완화저적쌍두송완함량;Ⅱ류원유주요래원우은평조경원암,구유고적쌍두송완화저적C_(30)4-갑기치완함량;Ⅲ류원유위문창조중심호상경원암화은평조경원암혼합래원,C_(30)4-갑기치완화쌍두송완함량균교고.종평면분포간,Ⅰ류원유주요분포우원리요함적철기구;Ⅱ류원유주요분포우혜주요함내은평조경원암발육적지구;Ⅲ류원유분포우혜주요함내문창조중심호상화은평조경원암공동발육적지구.종종향분포간,Ⅰ류원유주요분포우천층적한강조화주강조;Ⅱ류원유주요분포우중심층적은평조화주해조;Ⅲ류원유재주해조、주강조화한강조균유분포.
Many oilfields and oil-bearing traps have been found in Huizhou Depression and its neighboring area in recent years. Oils in Huizhou Depression and its neighboring area can be classified to three types according to their biomarker characteristics. Type-I oil mainly originated from the middle-deep lacustrine source rock in Wenchang Formation and had high content of C_(30)4-methyl steranes and low content of bicadinanes. Type-Ⅱ oil was mainly derived from source rock of Enping Formation and had high content of bica-dinanes and low content of C_(30)4-methyl steranes. Type-Ⅲ oil came from the middle-deep lacustrine source rocks in Wenchang and Enping formations and had relatively high content of C_(30)4-methyl steranes and bicadinanes. Regionally, type- I oil mainly distributed at the uplift area. Type-Ⅱ oil mainly distributed inside the sags that have good source rock of Enping Formation and poor source rock of Wenchang Formation. Type-Ⅲ oil mainly distributed inside the sags that have good middle-deep lacustrine source rocks of Wenchang and Enping formations. Vertically, type- I oil mainly distributed at shallow layers of Hangjiang and Zhujiang formations. Type-Ⅱ oil mainly distributed at deep Enping and Zhuhai formations, and type-Ⅲ oil commonly distributed at Hangjiang, Zhujiang and Zhuhai formations.