鄂尔多斯盆地东南缘岩溶热储对井回灌示踪试验

doi:10.13809/j.cnki.cn32-1825/te.2023.06.006

Abstract

Abstract:

Reinjection plays a crucial role in maintaining the pressure of geothermal reservoirs, extending the lifespan of geothermal fields and preserving the environment. In the Hancheng area, located at the southeastern margin of the Ordos Basin in Shaanxi province, there is an abundance of karst geothermal resources. Despite this, the level of development and utilization of these resources in the region remains relatively limited. To further evaluate the development potential of Karst geothermal resources in the region, we implemented a karst geothermal heating project and conducting a tracer test, employing NH₄SCN as the tracer. The goal was to establish an hydraulic connection between the production well and the reinjection well. Utilizing the thermal breakthrough model, predictions were made regarding the changes in the temperature of the production well as a consequence of long-term reinjection. The findings suggest that there is a primary direct pathway for the flow of water, and possibly a secondary path that may contribute to groundwater storage. The temperature of production well's water is projected to decline by 8.31 ℃ over 100 years due to the reinjection process. However, this decline is not expected to cause a severe temperature drop in the geothermal reservoir within this dual-well system.

Key words: Ordos basin, karst geothermal, double wells reinjection, tracer test, production well temperature

CLC Number:

TE132

XUE Yuze, ZHANG Yugui, MA Yinjuan, XUE Chao. Reinjection tracer test of karst geothermal reservoir in the southeastern margin of Ordos Basin[J].Petroleum Reservoir Evaluation and Development, 2023, 13(6): 757-764.

Figures/Tables 8

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Reinjection tracer test of karst geothermal reservoir in the southeastern margin of Ordos Basin

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