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Author | Li Wenjing Xiao Hongping Rao Song Shi Yidao Zhang Qiaoran Huang Shunde Hu Guangming

Title | Three-dimensional geothermal modeling and target selection of geothermal resources in the Central Depression and neighboring areas of the Songliao Basin

Source | Geoscience

Edit | Geothermal Core (add micro-signal: geothermalAI, can get related information)

→This is the Geothermal Energy Online AIgeothermal coreEditor's first1article

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full text guide

In the field of geothermal resources exploration, the application of 3D geothermal geological modeling technology is increasingly becoming a research hotspot. Recently, researchers have successfully constructed a 3D geothermal geological model of the Central Depression Area of Songliao Basin and its neighboring areas by using geophysical and borehole data as well as rock thermophysical data, and the spatial interpolation method of 3D Geomodeller software. The model not only visualizes the temperature field distribution of the geological body, but also provides an important basis for determining the favorable development area of geothermal resources.

By comparing the stratigraphic stratification of the blind wells and the measured temperature data of the boreholes, the researchers verified the accuracy of the three-dimensional geothermal geological modeling and temperature field simulation. The results show that the stratigraphic temperatures in the central depression of the Songliao Basin and its neighboring areas at depths of 1.0 to 4.0 kilometers range from 30.3°C to 62.8°C, 68.2°C to 120.2°C, 110.5°C to 166.7°C, and 158.4°C to 214.2°C, respectively. The high anomaly areas of the geothermal field are mainly concentrated in the central part of Changyuan, Daqing, Wangfu Depression in Binxian, and Changchunling backslope belt.

In addition, it was also found that the bottom plate temperatures of four sets of main thermal reservoirs in the Nenjiang Formation, Yaojia Formation II-III, Qingshankou Formation II-III, and Quan III-IV were between 15.8°C and 71.4°C, 23.6°C and 88.6°C, 31.8°C and 107.4°C, 48.9°C and 133.4°C, respectively. to 133.4℃, with the Chinese character well terrace, Daqing Changyuan, and Bingxian Wangfu depression as the high value areas of the main thermal reservoir temperature.

It was noted that the distribution of the geothermal field in the present study area is mainly controlled by the relief of the basement. The difference in thermal conductivity between the basement and the sedimentary layers leads to the "refraction" effect of heat flow, which promotes the redistribution of heat in the shallow part of the area, forming a concave-convex pattern of heat flow distribution. Fracture structures also have a significant impact on the distribution of high anomaly areas in the geothermal field.

After comprehensively analyzing the characteristics of heat source, channel and storage and cover combination, the researchers circled the third section - fourth section of Quantou Formation in the central area of Daqing Changyuan as a favorable target area for the development of geothermal resources in the Central Depression of the Songliao Basin, which provides scientific guidance for the development of geothermal resources in the future.

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HIGHLIGHT Pictures

Figure 1 Location and stratigraphic section of boreholes and seismic profiles in the Central Depression and adjacent areas of the Songliao Basin (modified from Ryder et al., 2003).

Fig.1 Distribution location and stratigraphic profile of boreholes and seismic sections in the central depression and adjacent areas of the Songliao Basin (modified from Ryder et al., 2003)

Fig. 2 Flow chart of 3D geothermal geologic modeling and geothermal field simulation in the Central Depression and adjacent areas of the Songliao Basin (modified from Calcagno et al.,2014).

Fig.2 Flow chart of three-dimensional geothermal geological modeling and geothermal field simulation in the central depression and adjacent areas of Songliao Basin (modified from Calcagno et al., 2014).

Fig. 3 Three-dimensional geothermal geological model of the Central Depression and neighboring areas in Songliao Basin

Fig.3 A three-dimensional geothermal geological model of the central depression and adjacent areas in the Songliao Basin

Figure 4 Comparison of stratification data and modeled stratification data for source 292 and ancient 514 wells

Fig.4 Comparison of stratified data and model stratified data of Yuan 292 and Gu 514 wells

Fig. 5 Comparison of measured and simulated ground temperature curves for Xushen1 and Songke2

Fig.5 Comparison of measured and simulated ground temperature curves between Xushen 1 and Songke 2

Fig. 6 Fitting of measured and simulated heat flow values in the Central Depression and neighboring areas of the Songliao Basin

Fig.6 Fitting diagram of measured and simulated heat flow values in the central depression and adjacent areas of the Songliao Basin

Fig. 7 Simulation results of geothermal field at different depths in the Central Depression and neighboring areas of Songliao Basin

Fig.7 Simulation results of geothermal fields at different depths in the central depression and adjacent areas of the Songliao Basin

Fig. 8 Plane spreading of mean geothermal gradient from 0 to 4.0 km depth in the Central Depression and neighboring areas of Songliao Basin.

Fig.8 Plane distribution of average geothermal gradient at a depth of0～4.0 km in the central depression and adjacent areas of the Songliao Basin

Fig. 9 Plane spread of temperature of the bottom plate of the main thermal storage in the Central Depression and neighboring areas of Songliao Basin

Fig.9 Temperature distribution of the main thermal storage floor in the central depression and adjacent areas of the Songliao Basin

Fig. 1 0 Simulation results of the geothermal field of the sl2 and sl5 seismic profiles in the Songliao Basin (see Fig. 1 for the location of the profiles).

Fig.10 Simulation results of ground temperature field in seismic sections sl2 and sl5 of the Songliao Basin(profile shown in Fig.1)

Fig. 1 1 Contour map of depth-embedded 150.0°C isothermal surface in the central depression and neighboring areas of the Songliao Basin

Fig.11 Contour map of 150.0℃isothermal surface burial depth in the central depression and adjacent areas of the Songliao Basin

Disclaimer: This article is for academic communication and dissemination only, and does not constitute investment advice

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