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地球由地壳、地幔和地核组成,它是一个巨大的地热库,越往下温度越高。地热是指地球内部蕴藏的能量。从地球表面往下正常增温梯度是1 km增加25℃～30℃,地下40 km处温度可达1 200℃,地球中心温度可达6 000℃。据科学家推算,仅地下10 km厚的一层储热能就达1 050万亿亿kJ,相当于9 950万亿t标准煤所释放的热量。用钻探手段把地下几千米的热水抽到地表,这就是地热资源开发。
The earth consists of the crust, the mantle and the earth’s core. It is a huge geothermal reservoir, the higher the temperature goes down. Geothermal refers to the earth’s energy inside. The normal temperature gradient from the Earth’s surface down to 1 km increases from 25 ° C to 30 ° C. The temperature at 40 km underground can reach 1 200 ° C and the Earth’s center temperature can reach 6 000 ° C. According to the scientists’ calculations, the thermal energy stored in a layer of only 10 km underground reaches 105.5 billion kJ, equivalent to the heat released by 9 950 trillion tons of standard coal. Drilling underground water several kilometers of pumping to the surface, this is the development of geothermal resources.