珠江口盆地惠州凹陷新领域勘探重大发现及意义

Great discovery and signifi cance of new frontier exploration in Huizhou sag,Pearl River Mouth Basin

珠江口盆地惠州凹陷是南海东部石油工业的摇篮,也是珠江口盆地(东部)最早取得中深层古近系油气突破的地区。近10年惠州凹陷勘探遭遇瓶颈,为了寻找新的大中型油气田,开展研讨和加强石油地质条件再评价工作。通过转变思路,坚定“老油区新作为”的勘探信心,提出“立足富洼、聚焦古近系—古潜山、拓展新领域”的勘探理念;加强研究攻关,提出富油洼陷找气新认识,惠州26洼湖相混合型母质“油气兼生,晚期快速生气”,具有较大天然气资源潜力;提出环惠州26洼“古近系—古潜山”圈闭群具有“近源强势供烃、立体网状输导”成藏模式,是勘探转型、新领域突破的首选区带。近期该区带惠州26-6“古近系—古潜山”大中型油气田勘探突破证实了高成熟富油洼陷找气新方向,揭开了惠州凹陷“古近系—古潜山”勘探新篇章,极大拓展了珠江口盆地(东部)古潜山勘探新领域。

The Huizhou sag in the Pearl River Mouth Basin is the cradle of petroleum industry in the eastern South China Sea,and is also the breakthrough area of oil and gas discovery in middle-deep Paleogene in the(eastern)Pearl River Mouth Basin.In recent 10 years,exploration in the Huizhou sag has encountered a bottleneck.In order to discover new large-medium oil and gas fi elds,it is necessary to hold workshop and strengthen the re-evaluation work of petroleum geological conditions.Through the change of ideas,the exploration confi dence of“new achievements in mature areas”is strengthened.And the new exploration concept is put forward,which is“taking oil-rich sub-sags as basis,focusing on Paleogene-buried hills and expanding to new frontiers”.With strengthening on researches,the new understandings of gas exploration in oil-rich sub-sag are put forward.In the Huizhou 26 sub-sag,the mixed-type kerogen of lacustrine facies is characterized by“generation of both oil and gas,and rapid gas generation in the late stage”,which has great potential of natural gas resources.The trap group of“Paleogene-buried hills”around the Huizhou 26 sub-sag has the hydrocarbon accumulation model of“strong near-source hydrocarbon supply and stereoscopic network transportation”,which is the preferred zone for exploration transformation and new-fi eld breakthrough.The recent exploration breakthrough of“Paleogene-buried hill”large-medium oil and gas fi eld in the Huizhou 26-6 structure in the area confi rmed the new direction of gas exploration in high mature oil-rich sub-sag,opened a new chapter of“Paleogene-buried hill”exploration in the Huizhou sag,and greatly expanded the new exploration fi eld of paleo buried hills in the(eastern)Pearl River Mouth Basin.