南黄海盆地底辟构造的地球物理特征  

Geophysical characterization of diapiric structures of the South Yellow Sea Basin

作　　者：Sungbae Kim MSuh 武雪山 侯方辉 Kihyun Kim 朱晓青 Sungbae Kim;MSuh;WU XueShan;HOU FangHui;Kihyun Kim;ZHU XiaoQing(Dept of Geoenvironment Sciences,Kongju National University,Gongju 314701,Korea;Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China;Functional Laboratory of Marine Mineral Resources Evaluation and Exploration Technology,Qingdao Pilot National Laboratory of Marine Science and Technology,Qingdao 266071,China)

机构地区：[1]韩国公州国立大学环境科学学院,公州314701 [2]韩国2.中国科学院地质与地球物理研究所,中国科学院油气资源研究重点实验室,北京100029 [3]中国科学院大学,北京100049 [4]中国地质调查局海洋地质研究所,青岛266071 [5]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,青岛266071

出　　处：《地球物理学进展》2021年第6期2738-2750,共13页Progress in Geophysics

基　　金：国家自然科学基金项目(41776081);青岛海洋科学与技术试点国家实验室鳌山科技创新计划项目(ASKJ200503)联合资助。

摘　　要：黄海地区拥有油气资源成为业界共识,但黄海西部油气前景如何仍业界未达成共识,海盆中的底辟构造对油气盆地前景有着重要影响.本文利用南黄海盆地的多道地震反射剖面寻找底辟构造,并结合反射几何、地震层速度和地磁异常等地球物理特征对底辟构造进行了综合分析.在南黄海盆地北部的东部区域共发现了5个底辟构造,分别为盐丘侵入、火成岩侵入和泥岩侵入(泥底辟)三种底辟类型.其中,具有地震层速度为4.5~6.7 km/s和向下延拓的地磁异常特征的底辟构造解释为火成岩侵入;地震层速度为4.5~5.4 km/s,且无地磁异常的底辟构造解释为盐丘侵入;地震层速度为1.7~3.1 km/s的底辟构造被解释为泥底辟构造,该类构造没有地磁异常存在.由于中新世中期的不整合面向上隆起,可以认为盐源和泥岩底辟作用导致的侵入体在中新世中期之后仍持续隆升.本文对南黄海北部盆地的东部区域发现的5个底辟构造进行综合分析,可为该区域油气研究提供依据.Diapiric structures were searched using seismic reflection sections in the South Yellow sea basin and they were analyzed with reflection geometry, seismic interval velocity and geomagnetic anomaly. Three types of diapirism, salt intrusion, igneous intrusion and mud diapir, were found out of 5 diapric structure in the South Yellow sea basin. Diapiric structures having seismic velocities of 4.5~6.7 km/s and relevant geomagnetic anomaly with downward continuation were interpreted as igneous intrusion. Diapiric structure having such high seismic interval velocity as 4.5~5.4 km/s and no geomagnetic anomaly was interpreted as salt dome. Diapiric structures of such low seismic velocity as 1.7~3.1 km/s are interpreted as shale diapir and it didn’t show any geomagnetic anomaly. Intruded bodies resulted from salt origin and mud diapirism are thought to keep their uplifing process even after mid-Miocene period, from the fact that the mid-Miocene unconformity is upwarped above them.

关 键 词：南黄海盆地 底辟构造 地震反射剖面 磁异常 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]