Characteristics of Deep Geothermal Field in Shuntuoguole Area of Tarim Basin

doi:10.7657/XJPG20250205

Abstract

Abstract:

The Tarim Basin is characterized by low surface heat flow and significant variation in formation temperature. To clarify the characteristics and controlling factors of deep geothermal field in the Shuntuoguole area of central Tarim Basin, by using the systematic steady-state temperature measurement data from 33 wells in the Shuntuoguole and surrounding areas, the geothermal gradients and deep temperature distribution characteristics were investigated. On this basis, the geothermal properties of sedimentary rocks and their impacts on heat flow and temperature were analyzed. Coupling with geophysical data, a layering model for the earth’s crust was constructed, and the heat flow density of the crust was calculated. The research results show that in the Shunnan, Shuntuo, and Shunbei areas, the average geothermal gradients at a depth ranging from 0 to 5 km are 22.5°C/km, 20.0°C/km, and 18.6°C/km, respectively, and the average formation temperatures at the depth of 8 km in the 3 areas are approximately 200°C, 175°C, and 135°C, respectively, indicating significant differences in the geothermal fields. The differences in the crustal structure account for variations in the crustal heat flow, and the crustal structure is the primary controlling factor for the geothermal field differences in the study area. The geothermal properties of sedimentary rocks have a negligible impact on the geothermal field. The rapid sedimentation in the Shunbei area since the Pliocene and the deep hydrothermal activity in the Shunnan area have no influence on the present-day geothermal field.

Key words: Tarim Basin, Shuntuoguole area, deep stratum, geothermal field, heat flow, geothermal property, crustal structure

CLC Number:

TE132

LIAO Keyan, QIU Nansheng, CHANG Jian, LI Dan, LI Huili, MA Anlai, LI Jingying. Characteristics of Deep Geothermal Field in Shuntuoguole Area of Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 163-171.

Figures/Tables 10

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Table 1.

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井名	深度段/km	地温梯度/ （℃·km^-1）	平均热导率/ （W·m^-1·K^-1）	放射性生热率/ （μW·m^-3）	顶部热流密度/ （mW·m^-2）
SN1井	0—2.0	22.0	2.20	0.75	49.1
	2.0—4.5	22.3	2.08	0.95	47.6
	4.5—7.0	18.8	2.31	1.45	45.3
	7.0—10.0		3.34	0.73	41.6
	基底				39.4
SB7井	0—2.0	18.4	2.04	1.01	38.7
	2.0—4.5	18.1	1.94	1.22	36.7
	4.5—7.0	16.8	1.90	1.43	33.6
	7.0—10.9		3.28	0.75	30.1
	基底				27.1