琼东南盆地深水区泥-流体底辟发育特征与天然气成藏  

The characteristic of Mud-Fluid diapir and its control on hydrocarbon accumulation in deep water area,Qiongdongnan Basin

作　　者：满晓 朱继田 姚哲 吴洁 王丽君 MAN Xiao;ZHU Jitian;YAO Zhe;WU Jie;WANG Lijun(Zhanjiang Branch of CNOOC Ltd,Zhanjiang 524057,Guangdong,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《地质找矿论丛》2018年第2期257-263,共7页Contributions to Geology and Mineral Resources Research

基　　金：国家科技重大专项"海洋深水区油气勘探关键技术"(编号:2016ZX05026)资助

摘　　要：琼东南盆地深水区发育泥-流体底辟构造,为油气垂向运移提供通道。文章基于琼东南区域构造与沉积演化认识,利用高精度三维地震资料,对深水区底辟构造进行了系统研究,识别出了底辟的分布范围,并分析了其发育机制以及对天然气成藏的控制作用。琼东南盆地深水区底辟主要发育在乐东—陵水凹陷结合部的陵南斜坡带及凸起之上,向凹陷中心规模逐渐减小。新近纪时期盆地快速沉降和生烃作用共同导致了深部异常高压的存在,其为底辟发育提供了原始的驱动力;陵南斜坡带古近纪发育的断裂为区域内的构造薄弱带,且在新近系发生活化为异常高压释放提供突破口,进而导致了底辟的形成,即底辟形成时间为新构造运动时期。底辟构造可沟通崖城组烃源岩及黄流组、莺歌海组储集体,是深水西区油气垂向运移的主要通道,控制了天然气藏的分布。根据底辟构造与烃源、储层的配置关系,提出了陵南斜坡带和松南低凸起区是深水区下步勘探的重点区带。Mud-Fluid diapir structur have been proved to be the vertical migration pathway of oil-gas in deep water area,Qiongdongnan Basin.Based on the regional tectonic and sedimentary evolution and highresolution 3D seismic data,diapir structures of deep water area were studied systematically for the first time.Result of the study shows distribution range of the diapir and the study analyzed development mechanism of the diapir and its control on the oil-gas accumulation.The diapir develops mainly on the slope zone and uplift close to the juction of Ledong-Lingshui Sag.To center of the sag size of the diaper gets smaller.rapid subsidence in Neogene and hydrocarbon generation jointly resulted in the deep abnormal high pressure which provides drive force for the diaper development.Fracture developed during paleogene in Lingnan slope zone is the tectonic weak zone and activated to be window for abnormal pressure release in Neogene so as to leading to formation the diaper,i.e.,the diapir was formed during Neo tectonic movement.The diapir connects the hydrocarbon source rock of Yacheng formation and reservoir of Yinggehai formation acting as vertical channel to transport oil-gas in the west deep water area and controls distribution of reservoirs.According to layout of the diaper and hydrocarbon source rock and reservoir is pointed out that Lingna slope zone and Songnan uplift zone are the key areas for further prospecting in the deep water area.

关 键 词：琼东南盆地 深水勘探 泥-流体底辟 气烟囱 天然气成藏 海南省 

分 类 号：P618.13[天文地球—矿床学]