渤海海域地热资源特征及储量评价

Characteristics and Reserves Evaluation of Geothermal Resources in Bohai Sea Area

渤海湾盆地所在的京津冀地区是中国重要的中浅层水热型地热开发区域,同时是一个中-新生代的大型含油气盆地。根据海上石油钻探结果,阐述了渤海海域新生界热储特征。研究区的地温梯度主要分布在28~32℃/km,大地热流值变化范围为33.5~84.0 mW/m^(2),平均为(60.8±8.7)mW/m^(2)。利用热储体积法估算新生界热储中储存的热量总计为4.5×10^(21)J,折合成标准煤为1.6×10^(11)t。建议渤海海域地热资源利用以地热水驱油和海上地热发电为主,利用前景十分广阔。研究为渤海海域地热资源评价及开发利用提供了借鉴。

The Beijing-Tianjin-Hebei region,where the Bohai Bay Basin is located,is an important middle-shallow hydrothermal geothermal development area in China,and is also a large oil and gas bearing basin of the Meso-Cenozoic era.Based on the results of offshore oil drilling,the characteristics of the Cenozoic thermal storage in the Bohai Sea area were elaborated.The geothermal gradient in the study area is mainly distributed between 28-32℃/km,and the variation range of geothermal flow value is 33.5-84.0 mW/m^(2),with an average of(60.8±8.7)mW/m^(2).Using the heat storage volume method to estimate the total amount of heat stored in the Cenozoic thermal storage is 4.5×10^(21) J,equivalent to 1.6×10^(11) t of standard coal.It is suggested that the utilization of geothermal resources in the Bohai Sea area should mainly focus on geothermal water for oil displacement and offshore geothermal power generation,with a very broad utilization prospect.This study provides a reference for the evaluation and development of geothermal resources in the Bohai Sea area.