南海北部深水及超深水区现今地温场及热结构特征研究  

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

作　　者：杨树春 吴景富 唐晓音[2] 仝志刚 王柯 郝建荣 

机构地区：[1]中海油研究总院,北京100027 [2]中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京100029

出　　处：《地质科学》2014年第3期781-790,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划"973"项目(编号:2009CB219501)资助

摘　　要：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。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.

关 键 词：南海北部 超深水区 地温梯度 大地热流 岩石圈热结构 

分 类 号：P314[天文地球—固体地球物理学]