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通过对南沙中部海域北康盆地重、磁资料的定量计算、定性解释,认为空间重力异常主要受浅部地质因素影响,空间重力异常的高低间接地反映了海底地形起伏变化、新生代沉积层厚度大小、沉积岩密度变化以及基底的坳、隆等特征;磁力异常资料通过预后处理及反演计算,推测北康盆地新生代火成岩以酸性-中基性岩为主,磁性基底与声波基底基本一致,可划分为三处坳陷及两处隆起;北康盆地位于减薄的大陆壳上,莫霍面深度约19～22 km。重、磁资料综合解释结果为沉积盖层构造分区、基底断裂推断及火成岩岩性识别提供依据。
Through the quantitative calculation and qualitative interpretation of the heavy and magnetic data in the Beikang basin of the central Nansha region, the authors believe that the spatial gravity anomalies are mainly affected by the shallow geological factors. The spatial gravity anomalies indirectly reflect the seafloor topography fluctuation, the Cenozoic sedimentary layer thickness Size, density of sedimentary rocks and basement Au, Long and other characteristics; magnetic anomaly data through the prognosis and inversion calculations, speculated that the Cenozoic igneous rocks in the Northern Hong basin acidic - basic rock, the magnetic base and the acoustic base is basically the same, It can be divided into three depressions and two uplifts. The Beikang basin is located on the thinned continental crust. The depth of the Moho is about 19 ~ 22 km. The results of comprehensive interpretation of heavy and magnetic data provide the basis for the structural division of sedimentary cover, the basement fault inference and the lithology identification of igneous rocks.