海南岛幅重力异常基本特征是自由空间异常呈现北高、南低的变化趋势,布格重力异常表现为随着水深加大,异常值增大,由西北向东南方向(南海海盆)逐渐增高。海南岛幅磁异常基本特征是以负值为主,东部磁异常走向主要为北东和东西向,西部磁异常走向主要为北西向。陆架区为低缓负异常,陆坡区为局部负异常及正负伴生异常,深海盆地为急剧变化的条带状异常,而西沙群岛为局部急剧变化的异常。依据重磁场异常,结合相关的地形、地貌、地质构造等资料对海南岛幅进行合理分区,并初步进行地质因素分析。 The basic feature of gravity anomaly in Hainan Island is that the free space anomaly presents the trend of north high and low south. The Bouguer gravity anomaly shows that as the water depth increases, the anomalous value increases and increases from northwest to southeast (South China Sea Basin). The basic characteristics of the amplitude magnetic anomalies in Hainan Island are mainly negative values. The magnetic anomalies in the east tend to be the NE and the east-west, while the magnetic anomalies in the west are mainly NW. The shelf area is characterized by low anomalous and negative anomalies. The slope area is characterized by local negative anomalies and positive and negative associated anomalies. The abyssal basin is a rapidly changing banded anomaly, while the Xisha Islands is an anomaly with locally drastic changes. Based on the anomalies of the heavy and magnetic fields, the paper divides the Hainan Island webs into a reasonable area based on the related topography, landform and geological structure, and conducts preliminary geological analysis.