Characteristics and Major Controlling Factors of Geothermal Field of North Cangxian Uplift

doi:10.19657/j.geoscience.1000-8527.2021.031

Abstract

Abstract:

The northern part of Cangxian uplift is rich in geothermal resources, but the formation mechanism and major controlling factors of geothermal fields are still controversial. Based on the compilation of regional geological and well-temperature data, and integrated with forward modeling of heat conduction, we systematically analyze the horizontal and vertical temperature gradient characteristics in the study area, and the distribution patterns of geothermal field under different geological conditions. We then forward-model two measured geothermal profiles to analyze the major controlling factors of local thermal field distribution. The results show that the horizontal geothermal gradient is relatively high in the salient area, but relatively low in the depression area, which corresponds well with the bedrock undulation. The vertical geothermal gradient can be divided into two sections: the shallow sedimentary caprock is higher and of mainly heat conduction, whilst the lower thermal reservoir is lower in the Cambrian, Ordovician and Jixian reservoirs, and mainly of thermal convection. Meanwhile, the local thermal field distribution is mainly controlled by the bedrock burial depth, and (in some places) is also affected by the upwelling of underground hot-water along faults. This study provides an important basis for future selection of geothermal development sites.

Key words: Cangxian uplift, geothermal resource, geothermal gradient, thermal modeling, temperature field

CLC Number:

P314

SU Yuchi, MAO Xiaoping, ZHANG Fei, MAO Ke, LU Pengyu. Characteristics and Major Controlling Factors of Geothermal Field of North Cangxian Uplift[J]. Geoscience, 2021, 35(02): 403-411.

Figures/Tables 11

Fig.1 Structure unit division diagram of the Bohai basin (a) (modified from reference [15]) and simplified geologic map of the study area (b) (modified from reference [7-8,16])

Fig.2 Structural profile evolution diagram for the northern part of Cangxian uplift (profile location shown in Fig.1(b))

Table 1 Geothermal gradient data of typical 11 geothermal boreholes and oil testing temperature boreholes in the northern part of Cangxian uplift

井名	构造位置	研究深度 /m	热储层位	G_盖/ (℃·km^-1)	资料来源
津热1井	双窑凸起	200~1 068	Nm	40	文献[20]
王3	双窑凸起	200~1 034	Nm	56.6
WR-2	双窑凸起	1 200~1 450	O	24.3
津4井	小韩庄凸起	2 000~2 100	O	36
增4井	小韩庄凸起	200~1 800	Nm	42.4
工大1井	双窑凸起	2 300	O	37.8	文献[11]
胜1井	大城凸起	2 224	∈	30.5	文献[15]
葛5井	大城凸起	3 249	Jxw	31.8
葛8井	大城凸起	2 777	∈	31.9
马90井	大城凸起	250~600	Nm	41.1
马95	大城凸起	1 980~2 020	∈	21.8
平均值				35.9

Fig.3 Geothermal gradient distribution in the northern part of Cangxian uplift

Fig.4 Geothermal gradient-temperature-depth profile of WR63 (a) and WR73 (b) within the Cangxian uplift

Fig.5 Numerical simulation model of ground temperature

Fig.6 Simulation results of geothermal field distribution under different wallrock thermal conductivity

Fig.7 Simulation results of geothermal field distribution under different bedrock depths

Table 2 Thermal conductivity data for geothermal field simulation

地层年代	新生界 (E+N)	中生界 (Mz)	上古生界 (C-P)	下古生界 ($\epsilon$,O)	中、上元古界(Pt₂₊₃)
热导率/ (W/(m·K))	1.72	2.04	3.26	3.26	5.17

Fig.8 Geothermal profile simulation map of the Dacheng and Xiaohanzhuang salients (profile A-A' location shown in Fig.1(b))

Fig.9 Geothermal profile simulation map of the Dacheng and Xingji salients (profile B-B' location shown in Fig.1(b))

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