南海北部天然气水合物成矿区的地球物理异常特征

Geophysical Anomaly Characteristics of Gas Hydrate Zone in Northern South China Sea

以南中国海北部天然气水合物勘探区的实际地球物理资料为依据,探讨了天然气水合物矿区的地震反射异常特征、地球物理测井异常特征、地热特征及其之间的关系。研究结果表明,常规地震剖面结合叠后地震属性剖面解释能够有效识别水合物成矿带;水合物声波速度、电阻率与密度等测井曲线的组合分析是判断水合物层赋存的有效途径;通过地震、测井及地热等多种地球物理特征联合分析与融合,能够优化、集成有效的地球物理技术,提高天然气水合物识别的有效性,形成可靠的水合物矿藏预测技术方法。

Based on the geophysical data of gas hydrate prospecting area in northern South China Sea,the correlation analysis of the seismic reflectance and attribute profiles,geophysical logging curves and geothermal data in this area is conducted,and the anomaly characteristics of these and their relations are discussed.The result shows that the conventional seismic profile integrated with post-stack seismic attribute profile interpretation can be used to effectively identify the gas hydrate zone in northern South China Sea;the combination of acoustic velocity logs,resistivity logs and density logs is the effective way to judge the occurrence of the gas hydrate zone in this area;the comprehensive analysis and combination of these geophysical characteristics can optimize and integrate effectual geophysical technologies,enhance the validity of identifying gas hydrate and develop a set of reliable prediction means.