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• W2567664881 abstract "The formation of geothermal resources in Neihuang County is mainly controlled by the geological structure. Based on the work of collecting and analyzing the results of previous geological work, research on geological conditions and geothermal resource characteristics of the investigation area and geophysical prospecting in the well-defined target area have been carried out. The position of the exploration well is determined based on the interpretation of geophysical data, and the desired effect is achieved by drilling the well. In this paper, by combining the feasibility study and its final data of the first deep geothermal well in Neihuang County, we made a detailed analysis and discussion on the geothermal and geological conditions of Neihuang County. 1. INTRODCTION Neihuang County is located in the north-central part of Henan province. From the tectonic point of view, it is located in the east of Neihuang uplift, the west of Changyuan fracture and the west side of the intersection site of Neihuang uplift and Dongming fault. According to the study, we predict the occurrence of geothermal water resources on the west of Changyuan fracture. But because there is no systematic exploration work for geothermal resources in Neihuang County, the research of geothermal geological conditions in this region is basically in the blank. It is significant for the development and utilization of geothermal resources in NeiHuang region to analyze the geothermal and geological conditions and study the distribution and characteristics of geothermal resources. 2. REGIONAL GEOLOGY 2.1 Formation Neogene continental sediments are widely distributed under the Quaternary unconsolidated sediments within the scope of Neihuang plains. And the lower part of the Neogene continental sediments is the Paleogene deposits. They are all interbedding of semi-cemented sandstone and mudstone layers and the thickness is at least thousand meters. The moisture content and permeability characteristics of the pore structure in this sandstone formation provide favorable conditions for storage and transport of geothermal water, thus constituting a Cenozoic thermal reservoir, while the impermeable shale formations constitute the cap. Under this Cenozoic strata, permo-carboniferous strata composed by sandstone and shale was well developed; Further down is the older formation which is mainly composed by the Cambrian-Ordovician limestone, where the karst fissure of carbonate rocks developed better and constituted the bedrock thermal reservoir of geothermal resources. The bedrock thermal reservoir provides good possibilities of conducting geothermal tail water reinjection in the future. 2.2 Geological structure On the perspective of regional structure, Neihuang County is located in the east of Neihuang uplift, which is in the southern China and DPRK paraplatform, on the west side of Changyuan fracture. The fracture is a boundary fracture on the west side of Liaolan deep fracture. The trend is NNE, the section is east-dipping and the dip angle is more than 50°. As normal fracture, its west dish rise and east plate down. The drop is 2000~3000m. Its fault cuts formations from Paleozoic to Neogene, form the boundary of Neihuang uplift and Dongming fault depression and controls the formation and development of the two tectonic units. The secondary unit of Neihuang geological structure belongs to the Neihuang uplift and neighbors to the west of Dongpu Depression. The trend of the boundary fracture for them is NNE. The third unit division of Neihuang geological structure is depression in the north of Neihuang County, uplift in the southwest of the county, and Neihuang County which is located on the slope between these two structures. Relevant data shows that deep drillings carried out in Neihuang in the past are not much. There is only a small number of geothermal wells drilled in the Neogene sandstones, which did not come into contact with the base rock. Therefore, it fails to see any fracture through the county on the existing geological maps. The area is in the transitional zone between Neihuang Uplift and Dongpu Depression and the derection of their boundary faults is NE. For this reason, under the effect of the regional stress field, a series of secondary faults in parallel with the boundary faults should exist in the county. In order to fully confirm the existence of the presumed faults, we carried out the corresponding geophysical exploration and interpretation work in Neihuang County." @default.
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• W2567664881 date "2015-01-01" @default.
• W2567664881 modified "2023-09-26" @default.
• W2567664881 title "Research on the Geothermal Geological Condition in Henan Province Neihuang County Town" @default.
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