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渤海湾盆地冀中坳陷是我国最典型的潜山油气藏富集区.本文借助117口钻井地层测温资料和45块实测岩石热导率数据系统研究了冀中坳陷现今地温梯度、大地热流、热岩石圈厚度、岩石圈热结构等地热特征参数.研究表明,冀中坳陷0~3000m统一深度现今地温梯度为20.8~41.0℃·km-1,平均值为31.6℃·km-1,比未校正值减小1~3℃·km-1;现今大地热流介于48.7~79.7mW·m-2,平均值为59.2mW·m-2.平面上,冀中坳陷现今地温梯度和热流由西向东(从盆地边缘向内部)逐渐增大,并且凸起区地温梯度和热流相对较高,而凹陷区则偏低,与基底地形起伏具有很好的对应关系.同时,冀中坳陷腹部高热流凸起区广泛分布地热田.冀中坳陷现今热岩石圈厚度为98~109km,其岩石圈热结构为一典型的“冷壳热幔”型.本研究不仅对冀中坳陷油气勘探与地热能开发具有重要的指导意义,而且为深部岩石圈研究(华北克拉通破坏科学问题)提供了新依据.
The Jizhong Depression in the Bohai Bay Basin is the most typical enrichment area for buried hill oil and gas reservoirs.In this paper, based on the data of 117 drilling formation temperature and 45 measured data of thermal conductivity of rock, the present geothermal gradient in Jizhong depression, Heat flow, thermal lithosphere thickness and lithospheric thermal structure, etc. The results show that the present geothermal gradient at the depth of 0 ~ 3000m in Jizhong Depression is 20.8 ~ 41.0 ℃ · km-1 with an average of 31.6 ℃ · km-1 , Which is 1 ~ 3 ℃ · km-1 less than the uncorrected value, and the present heat flux is between 48.7 ~ 79.7mW · m-2 with an average value of 59.2mW · m-2. In the plane, And the heat flux gradually increases from west to east (from the edge of the basin to the interior), and the geothermal gradient and heat flow in the raised area are relatively high while the depressed area is low, which has a good correspondence with the undulating topography of the basement. The geothermal field is widely distributed in the high heat flow bump area in the depression of the depression.The current hot lithosphere in the Jizhong depression is 98 ~ 109 km thick, and its lithospheric thermal structure is a typical “cold-crust hot mantle” type. Jizhong Depression oil and gas exploration and geothermal energy development has an important guiding significance, but also for the study of deep lithosphere (North China grams Ratton destroys scientific issues) provides a new basis.