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依据前人对岩石圈层结构的认识和地震反射界面揭示的沉积充填,本文对南海北部深水及超深水区域的现今地温场特征及岩石圈热结构进行了计算。结果表明:南海北部深水及超深水区具有“热盆”特征,超深水区较深水区更热,但超深水区沉积基底的现今温度较深水区低。大地热流值的总体变化趋势表现为从深水区向超深水区逐渐增高,与地壳和岩石圈向南减薄趋势一致。南海北部深水及超深水区具有“冷壳热幔”的岩石圈热结构特征。地壳热流主要由基底的构造形态和地壳减薄程度控制,地幔热流则只受控于岩石圈基底埋深。
Based on the previous understanding of the lithosphere structure and the sedimentary filling revealed by the seismic reflection interface, the current geothermal field characteristics and lithospheric thermal structure in the deep and ultra-deep water areas of the northern South China Sea are calculated. The results show that the deep-water and ultra-deep water areas in the northern South China Sea are characterized by “hot basins”, and the deeper water areas in the ultra-deep water areas are hotter than the deep water areas in ultra-deep water areas. The overall trend of the geothermal heat flow shows a gradual increase from deepwater to ultra-deepwater, consistent with the trend of southward crustal and lithosphere thinning. The lithospheric thermal structure of “cold crust hot mantle” in deep-water and ultra-deepwater areas in the northern South China Sea. The crustal heat flow is mainly controlled by the structure of the basement and crustal thinning, and the mantle heat flow is only controlled by the lithosphere basement depth.