琼东南盆地"气聚集带"的成藏特征与勘探潜力
Accumulation characteristics and exploration potentials of gas accumulation belt in Qiongdongnan Basin
张功成 1纪沫 1陈莹 1甘军 2王东东 3张春宇1
作者信息
- 1. 中海油研究总院有限责任公司 北京 100028
- 2. 中海石油(中国)有限公司海南分公司 海南海口 570312
- 3. 山东科技大学地球科学与工程学院 山东青岛 266590
- 折叠
摘要
琼东南盆地是中国近海的一个在浅水区、深水区、超深水区均发现煤型大气田的盆地,探讨其天然气地质特征及勘探新领域具有重要的理论和实际意义.笔者基于区域地质、地震、钻井、地球化学测试等数据分析了琼东南盆地的成藏特征和勘探潜力.研究结果表明:琼东南盆地在崖城组沉积期具有"两隆两坳"的构造格局,崖城组的煤型烃源岩(包括煤系烃源岩和陆源海相烃源岩)是主要的烃源岩,以渐新统崖城组(扇)三角洲为中心的煤型烃源岩的生烃灶,主要沿北部坳陷北缘、中央坳陷南缘和北缘呈串珠状分布;北部坳陷北缘的煤型烃源岩的成熟度低,未进入大量生气阶段;中央坳陷南缘和北缘的煤型烃源岩均已成熟,且已进入大量生气阶段;每个(扇)三角洲发育的煤系烃源岩及其周边的陆源海相泥岩均为1个富气生烃灶.受渐新世煤型烃源岩的生烃灶控制,形成了中央坳陷南缘和北缘2个大型气聚集带;气聚集带中的凸起、断阶带、缓坡带、凹中浊积体等圈闭是煤型天然气的主要勘探领域,勘探前景巨大,天然气资源量预计超过2×1012m3.
Abstract
In China,Qiongdongnan Basin is the only place where large coal type gas fields have been discovered in shallow water,deep water,and ultra-deep water areas.Therefore,it is of important theoretical and practical significance to explore the geolog-ical characteristics of natural gas and new exploration fields in the basin.Based on regional geological,seismic,drilling,and geo-chemical testing,the paper analyzes the accumulation characteristics and exploration potentials of Qiongdongnan Basin.The re-sults indicate that a tectonic framework of"two uplifts and two subbasins"was formed during the deposition period of Yacheng Formation in Qiongdongnan Basin.The coal-type source rocks(including coal-measure source rocks and terrestrial marine source rocks)of Yacheng Formation are the major source rocks,and the source kitchen of coal-type source rocks in the(fan)delta of the Oligocene Yacheng Formation mainly shows a bead-like distribution along the northern margin of the northern depression,the southern and northern margins of the central depression belt.The maturity of coal-type source rocks in the northern margin of the northern depression is low and has not come up to the main gas generation stage.The coal-type source rocks at the southern and northern margins of the central depression belt are mature and have entered the main gas generation stage.Coal-measure source rocks and the surrounding terrestrial marine mudstones developed in each(fan)delta are one source kitchen.As controlled by the source kitchen of the Oligocene coal-type source rocks,two large gas accumulation belts were formed at the southern and northern margins of the central depression belt.The main exploration areas for coal-type natural gas include uplifts,step-fault belts,gentle slope belts,and turbidite bodies inside sags in the gas accumulation belt,showing great exploration prospects,and the natural gas resources are expected to exceed 2 × 1012m3.
关键词
琼东南盆地/煤系(扇)三角洲/生烃灶/气聚集带/勘探领域Key words
Qiongdongnan Basin/coal-measure(fan)delta/source kitchen/gas accumulation belt/exploration field引用本文复制引用
基金项目
中国海洋石油集团有限公司"十四五"科技重大项目(KJGG2021-0100)
国家科技重大专项(2016ZX05026)
国家重点基础研究发展计划(973)项目(2009CB219400)
国家自然科学基金项目(91528303)
出版年
2024
NETL
NSTL
万方数据