| Abstract |
North China area mainly includes Beijing, Tianjin, Hebei, Shandong and Henan areas. With an area of 410,000 square kilometers and a population of 250 million, the region has two municipalities directly under the Central Government, three provincial capitals, 34 prefecture-level cities and 394 county-level administrative units. North China area is tectonically located in the North China Plate, which is composed of Mesozoic-Cenozoic rift basin, Bohai Bay basin and its surrounding uplift area. This area is the most abundant area of hydrothermal geothermal resources in China, and it is also the favorable developing area of HDR（hot dry rock）resources. The potential of HDR resources is 1.81×1024J. North China area is also an important oil and gas exploration area in China. After more than 60 years of oil and gas exploration and development practice, five oil and gas fields have been discovered, and a large number of borehole data have been accumulated. Preliminary statistics show that deep wells are mainly distributed in Jizhong, Huanghua, Linqing and Jiyang Depressions tectonically. There are 44 wells with a drilling depth of 4000-7026m and a bottom hole temperature range of 129.5-235℃. The bottom hole temperatures of the 28 wells exceed 150℃. The strata drilled include sandstone, mudstone and limestone from Paleogene to Mesoproterozoic. Carbonate rocks, including dolomite and limestone, are the main potential geothermal reservoirs for EGS projects, and have the temperature and geological basis for large-scale development of HDR resources. The HDR in North China is buried relatively deep, mostly in 4000-6000m, and the temperature is not high (150-200℃). The resource utilization efficiency is generally less than 10% if it is used for power generation, whereas the utilization efficiency can raise to more than 90% for space heating. Moreover, the haze pollution in North China is very serious during the winter heating season, and the demand for green and clean heating is extremely urgent. Thus, considering resource quality and market demand comprehensively, the utilization direction of HDR resources in North China area should be mainly space heating, supplemented by power generation. |