琼东南盆地深水海底扇岩性圈闭成藏主控因素与勘探突破
尤丽 , 江汝锋 , 龚宇 , 徐守立 , 詹冶萍 , 郑飞 , 韩建辉
地球科学 ›› 2024, Vol. 49 ›› Issue (02) : 749 -758.
琼东南盆地深水海底扇岩性圈闭成藏主控因素与勘探突破
Main Controlling Factors of Accumulation and Exploration Breakthrough of Deep-Water Submarine Fan Lithologic Trap in the Qiongdongnan Basin
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为研究琼东南盆地乐东-陵水凹陷中新统梅山组海底扇面临圈闭有效性与油气富集规律关键问题. 综合海底扇沉积储层特征、圈闭形成与侧封条件、天然气运聚分析,明确梅山组海底扇岩性圈闭成藏主控因素. 结果表明:(1)北物源海底扇主要分布于北斜坡区,凹陷带发育西部昆嵩隆起物源影响海底扇向凹推进远、储层物性较好; (2)发育对接水道泥岩、对接水道砂岩、岩性尖灭、断层侧封4种圈闭类型; (3)天然气为崖城组烃源岩供源的成熟-高熟天然气,具有“源内大型构造脊汇聚、沟源断裂/裂隙带垂向运移+砂岩侧向输导,有效圈闭富集”天然气成藏模式. 针对凹陷带尖灭型和对接水道泥岩型圈闭分别部署钻探,均获得勘探突破,明确了下步拓展方向.
琼东南盆地 / 乐东-陵水凹陷 / 深水 / 中新统 / 海底扇 / 圈闭条件 / 成藏主控因素 / 石油地质
Qiongdongnan Basin / Ledong-Lingshui sag / deep-water / miocene / submarine fan / Trap conditions / main factors controlling of accumulation / petroleum geology
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中海石油(中国)有限公司科技项目“南海大中型天然气田形成条件、勘探潜力与突破方向”(KJZH-2021-0003-00)
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