Distribution features of current geothermal field in the Bohai Sea waters

Qiu Nansheng; Wei Gang; Li Cuicui; Zhang Yuan; Guo Yonghua

doi:10.11743/ogg20090404

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Distribution features of current geothermal field in the Bohai Sea waters
Vol. 30, Issue 4, Pages: 412-419(2009)
Online First：25 August 2009，

Published：2009
DOI： 10.11743/ogg20090404
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DOI：

Qiu Nansheng, Wei Gang, Li Cuicui, et al. Distribution features of current geothermal field in the Bohai Sea waters[J]. 2009, 30(4): 412-419. DOI： 10.11743/ogg20090404.

摘要

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.

Abstract

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.