琼东南盆地地质认识创新与深水领域天然气勘探重大突破  

Geological understanding innovation and major breakthrough to natural gas exploration in deep water in Qiongdongnan Basin

作　　者：施和生 杨计海 张迎朝 甘军 杨金海 Shi Hesheng;Yang Jihai;Zhang Yingzhao;Gan Jun;Yang Jinhai(Exploration Department of CNOOC Ltd.;Zhanjiang Branch of CNOOC Ltd.)

机构地区：[1]中海石油(中国)有限公司勘探部 [2]中海石油(中国)有限公司湛江分公司

出　　处：《中国石油勘探》2019年第6期691-698,共8页China Petroleum Exploration

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05026-002)

摘　　要：琼东南盆地深水区是南海北部重要的天然气勘探区带之一,也是大中型气田储量持续增长的主战场.在上中新统中央峡谷L17大气田等发现后,类似中央峡谷气田的浅层目标日益减少,深水勘探面临转型,新的大中型气田领域研究、勘探迫在眉睫.近5年来,通过思路创新、理论创新和技术创新,加强盆地区域构造、石油地质条件研究,深化凹陷生烃和油气优势运聚区带规律认识,引领深水勘探转型.研究表明,处于琼东南盆地东部超深水区的松南低凸起中生界潜山及古近系圈闭群具备“多凹环抱、大型输导脊侧向运移及厚层深海泥岩封盖”的优势运聚成藏条件,资源潜力大,是勘探转型、新领域突破的首选方向.近期该区带的天然气勘探突破证实了中生界潜山天然气新领域,拉开了深水区潜山千亿立方米气田发现的序幕,也极大拓展了南海西部海域特提斯构造域中生界潜山勘探领域.The deep water area in the Qiongdongnan Basin is one of the important natural gas exploration areas in the north of the South China Sea.It is also the main battlefield for continuous reserve increases of large and medium gas fields.After the discovery of the large L17 gas field in the Upper Miocene Central canyon,shallow targets similar to the central canyon gas field have been decreasing,and it is necessary to carry out more research on deepwater exploration for finding new large and medium-sized gas fields.In the past five years,innovations of ideas,theory and technology have focused on regional structure,petroleum geology and understanding of laws of hydrocarbon generation,migration and accumulation in sags,for the purpose to transform deepwater exploration in the Qiongdongnan Basin.The study shows that,in the Songnan low bulge in the eastern ultra-deep water area,the Mesozoic buried hills and the Paleogene trap group are surrounded by multiple sags,and have a large transport ridge as a lateral migration pathway,and thick deep-water mudstone as a cover.The advantageous transport and accumulation conditions mean a large potential of resources,which make the Mesozoic buried hills and the Paleogene trap group as the preferred direction for exploration transformation and new breakthroughs.The recent breakthrough to natural gas exploration in this area confirmed natural gas resources in the Mesozoic buried hill.It opened the prelude to the discovery of large gas fields at the scale of 100 billion m3 in the deep water area,and greatly expanded the exploration of the Mesozoic buried hill in the Tethys tectonic field in the western South China Sea.

关 键 词：琼东南盆地 深水 大中型气田 勘探转型 中生界潜山 新领域突破 

分 类 号：TE122.1[石油与天然气工程—油气勘探]