INTEGRATED GRAVITY-MAGNETIC-SEISMIC DATA INVERSION AND INTERPRETATION AND THEIR APPLICATION TO UNDERWATER TECTONICS
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摘要: 由于受到海水的覆盖,地球物理技术成为海洋地质调查的主要和首要手段。其中,地震资料能够较为清晰地反映浅部地质构造,但是,由于海洋地震勘探往往会受到外界因素的干扰,使深部地震反射资料品质较差,有效波能量较弱,无法根据地震资料获得深部构造形态,另外,地震资料无法获得火成岩分布的边界。重磁资料可以有效地反映断裂、火成岩等密度、磁性异常体,对构造区域的划分也有较好的指导作用,但是,由于位场数据固有的特点,使其存在严重的多解性,因此开展重磁震综合解释,可以充分发挥各种资料的优势,弥补其不足,从而提高解释的可靠性。本文利用1:100万重磁震资料对中国东北部海域研究区,包括渤海的大部分海域,北黄海以及南黄海的部分海域进行了综合解释,获得了研究区的断裂展布和火成岩分布特征以及研究区的整体构造区划。Abstract: Geophysical technology is the main and primary mean in marine geological survey for revealing shallow geological structures under water. In deep water, however, the seismic data are often interfered by outside factors as the energy of effective seismic waves is weakened with water depth. For instance, the identification of igneous rocks is always difficult using only seismic data. On the other hand, gravity and magnetic anomalies are those which respond effectively to some geological bodies with high density and/or magnetism, such as faults and igneous rocks, and often used as a guide to tectonic division. However, multiple solutions always occur in the interpretation of gravity and magnetic data due to various variables. In view of this, integrated interpretation of gravity-magnetic-seismic data is the only choice to fully use the advantages of the three methods to improve the reliability of interpretation. The paper takes the northeastern sea area of China as a case to make an integrated interpretation of gravity, magnetic and seismic data for the distribution pattern of faults and igneous rocks. Upon the basis, a new tectonic division of the area is presented.
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