渤海海域现今地温场分布特征

Distribution features of current geothermal field in the Bohai Sea waters

邱楠生 魏刚 李翠翠 张媛 郭永华

Qiu Nansheng Wei Gang Li Cuicui Zhang Yuan Guo Yonghua

渤海海域平均大地热流值为(60.9±8.7)mW/m,其中石臼坨凸起、沙磊田凸起和渤南凸起热流值高达70～80mW/m,渤中凹陷、黄河口凹陷和秦南凸起次之,其热流值也达到65～75mW/m,辽东湾、庙西、莱州湾、歧口、沙南、埕北等地区热流值较低,基本上都在65mW/m以下.渤海海域平均地温梯度为30.8℃/km,但各构造单元存在差异,其中沙磊田凸起、渤中、渤南、石臼坨等地区地温梯度明显较高,一般为32～42℃/km之间;凹陷区地温梯度低,一般为22～32℃/km之间.渤海海域地温场的分布与渤海海域的构造形态相似,大体反映了北北东走向的郯庐断裂构造型态.

The average geothermal flow in the Bohai Sea waters is (60.9±8.7)mW/m.It is up to 70～80 mW/m in the Shijiutuo,Shaleitian and Bonan uplifts,65-75 mW/m in the Bozhong sag,the Huanghekou sag and the Qinnan uplift,while lower than 65 mW/m in the Liaodong bay,Miaoxi,the Laizhou bay,Qikou,Sha'nan and Chengbei.The geothermal gradient varies in different structural units of the Bohai Sea waters and averages at 30.8℃/km.Higher geothermal gradient 32-42℃/km,is tested in the Shaleitian uplift,Bozhong,the Laizhou bay,Qikou,Sha'nan and Chengbei.In contrast,it is low in the sags,22-32℃/km on average.The distribution of geothermal field coincides with the structural configuration in the Bohai Sea waters,roughly reflecting the structural form of the NNE-trending Tan-Lu Fault.

10.11743/ogg20090404