莺歌海盆地现今地温场及热结构研究  

Study on present geothermal field and thermal structure in Yinggehai Basin

作　　者：郑峰 宋荣彩[1] 董贵宇 陈海雯 王迎春 张超[1] 吴涛 郑华安 梁玉凯 ZHENG Feng;SONG Rongcai;DONG Guiyu;CHEN Haiwen;WANG Yingchun;ZHANG Chao;WU Tao;ZHENG Huaan;LIANG Yukai(State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Chengdu University of Technology,Chengdu 610059,China;Hainan Branch of China National Offshore Oil Corporation,Haikou 570312,China;CNOOC South China Sea Oil and Gas Energy Academician Workstation,Haikou 570312,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中海石油(中国)有限公司海南分公司,海口570312 [3]中国海油南海油气能源院士工作站,海口570312

出　　处：《成都理工大学学报（自然科学版）》2023年第6期661-672,共12页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金重大项目(52192622);中国工程院战略研究与咨询项目(2022-HZ-18);中海油海南分公司一般项目(CCL2022HNFN0259)。

摘　　要：为评价莺歌海盆地地热资源优劣和了解盆地深部构造热演化,本文在收集莺歌海盆地及其邻区现有热物性参数的基础上,通过新增的9口钻井13个热物性参数,利用一维稳态热传导公式,计算了莺歌海盆地1000 m、2000 m、3000 m深度界面处地层温度;并沿着穿过盆地中央凹陷附近的地震测线采用分层阶段函数模型,计算了莺歌海盆地不同层位的热流分配关系(热结构)。计算时根据地震波的速度变化将地壳分为沉积盖层、上地壳上部、上地壳下部低速带与下地壳4层进行计算。结果表明:莺歌海盆地1000 m、2000 m、3000 m深度界面的地层温度分布特征表现为沿着河内凹陷—临高凸起南西方向—泥底辟一带温度较高,盆地北西、南东区域附近温度较低,地层温度的整体分布特征与地壳减薄及断裂发育有明显关系;地壳热流对地表热流的贡献占比41%,地幔热流对地表热流的贡献占比为59%。因此,莺歌海盆地具有“冷壳热幔”的岩石圈热结构特征。On the basis of collecting the existing thermophysical properties in Yinggehai Basin and its adjacent areas,13 thermophysical properties of 9 new wells and one-dimensional steady heat conduction formula are used to calculate the formation temperature at the interface depth of 1000 m,2000 m and 3000 m in Yinggehai Basin.The heat flow distribution relationship(thermal structure)of different layers in Yinggehai Basin is calculated by using the layered stage function model along the seismic line that passes through the central depression of the basin.According to the velocity changes of the seismic waves obtained during calculation,the crust in the study area can be divided into four layers,sedimentary cover,upper crust,low velocity zone in the lower upper crust and lower crust.The results show that the stratigraphic temperature distribution at the 1000 m,2000 m and 3000 m depth interface in the Yinggehai Basin is characterized by higher temperatures along the Hanoi Depression-southwest of the Lingao Bulge-muddy diapir,and by lower temperatures near the northwest and southeast corners of the basin.In general,the overall distribution of formation temperature is obviously related to crustal thinning and fault development.The contribution of crustal heat flow to surface heat flow accounts for 41%,and that of mantle heat flow to surface heat flow accounts for 59%.Therefore,Yinggehai Basin has the characteristics of“cold crust and hot mantle”lithospheric thermal structure.

关 键 词：莺歌海盆地 岩石圈热结构 温度场 热物性参数 壳—幔热流 

分 类 号：P314[天文地球—固体地球物理学]