摘要
莺歌海盆地莺北区中新统烃源岩资源潜力有限,制约了油气勘探。利用地质、地球物理和地球化学等资料,开展了莺北区渐新统三角洲识别与含煤性分析、资源潜力评价和不同构造单元成藏条件比较等工作,明确了莺北区渐新统资源潜力和有利勘探方向。研究表明:①莺北区渐新世具备发育大型(扇)三角洲的物质基础和构造条件,崖城组—陵水组继承性发育大型煤系三角洲,形成崖城组三角洲平原煤系和陵水组陆源海相泥岩2类烃源岩;②莺北区渐新统煤系三角洲是莺北区主力烃源岩,主要处于高成熟—过成熟度大规模生气阶段,天然气资源量达1.13万亿方;③莺北区凹陷带、东部斜坡带中组合是有利勘探方向,构造脊、鼻状构造等具有良好汇聚背景上的大型岩性、地层圈闭是发现大中型气田的重要领域。本项研究成果指导了莺北区的勘探突破。
The Yingbei area in Yinggehai basin exhibits restricted resource potential in its Miocene source rocks,posing limitations on hydrocarbon exploration.Utilizing geological,geophysical,and geochemical data,this study conducted the identification of the Oligocene delta in the Yingbei area,analysis of its coal bearing property,evaluation of the resource potential,and comparison of the hydrocarbon accumulation conditions across distinct structural configurations.The results clarify the resource potential of the Oligocene strata and identify promising exploration directions in the Yingbei area.The study reveals that:①the Oligocene epoch in the Yingbei area was characterized by suitable depositional and tectonic settings for the development of extensive(fan)deltas.An inherited development of large coal-bearing deltas was observed within the Yacheng Formation and Lingshui Formation,yielding two source rock types:the coal sequences within the deltaic plain of the Yacheng Formation and the terrigenous marine mudstones of the Lingshui Formation;②the coal-bearing deltaic deposits of the Oligocene strata are the primary hydrocarbon source rocks within the Yingbei area.These deposits have reached a high to over-maturity stage of thermal evolution,conducive to substantial gas generation,with estimated natural gas resources reaching 1.13 trillion cubic meters;③the mid-reservior-seal assamblages in the depression zone and the eastern slope belt of the Yingbei area exhibit the most favorable exploration potentials.Large lithostratigraphic traps positioned over structural ridges and noses,with favorable migration and accumulation conditions,represent critical areas for targeting substantial gas discoveries.The research results serve as a significant guidance for the exploration breakthrough in the Yingbei area.
作者
武爱俊
徐建永
杨海长
李宏义
肖伶俐
李欣
沈娇
王柯
WU Aijun;XU Jianyong;YANG Haizhang;LI Hongyi;XIAO Lingli;LI Xin;SHEN Jiao;WANG Ke(CNOOC Research Institute Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2024年第2期25-36,共12页
China Offshore Oil and Gas
基金
“十三五”国家科技重大专项“大型油气田及煤层气开发(编号:2016ZX05026)”
中国海洋石油有限公司“十四五”重大科技项目“中国近海新区新领域勘探技术(编号:KJGG2021-0300)”
中海石油(中国)有限公司重大项目“南海天然气基础地质与勘探战略方向(编号:2021-KT-YXKY-05)”部分研究成果。
关键词
莺歌海盆地
莺北区
渐新统
煤系三角洲
资源潜力
勘探方向
Yinggehai basin
Yingbei area
Oligocene
coal-bearing delta
resource potential
exploration direction
