Base on the previous achievements of the lithospheric structure and the sedimentary unit resulting from seismic profiles,the thermal structure and the present-day thermal field were calculated in the deep and ultra-deep water area of the northern of South China Sea. The present-day geothermal field in the deep and ultra-deep water area of the northern of South China Sea is characterized with "hot basin". The surface heat flow of the ultra-deep water area is higher than that of the deep water area,but the temperature of the sedimentary basement in the ultra-deep water area is lower than that in the deep water area. The heat flow value increases from the deep water area to the ultra-deep water area according to the thinning of the crust. Thermal structure of the lithosphere shows a typical feature of "cold crust and hot mantle" in the deep and ultra-deep water area. The crustal heat flow is predominantly affected by the sedimentary basement and the crustal thickness while the mantle heat flow is only controlled by the lithosperic basement depth.
. Study on the characteristics of thermal structure and present-day thermal field in deep and ultra-deep water area, northern of the South China Sea[J]. Chinese Journal of Geology, 2014, 49(3): 781-790.