| 松辽盆地坳陷层控地热系统研究 |
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| 关键词:Songliao Basin heat control mode Songke II well thermal properties |
| 基金项目:国家重点研发计划项目(编号: 2019YFB1504101);国家自然科学基金资助项目(编号: 41602271);中国地质调查局地质调查项目(编号: DD20160207-04) |
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| 摘要: |
| Study of Depression and Layer Controlled Geothermal System in Songliao Basin |
| Songliao Basin, a large sedimentary basin in Northeast China originated between the late phase of Indosinian movement and the early stage of Yanshan movement, is not only rich in oil and gas resources, but also a major potential area for geothermal energy sources in China. Based on the data from scientific drilling Well No.2 in Songliao Basin (Songke II Well, an ICDP framework project), we analyzed the characteristics of the deep geothermal field in this basin by drawing its petrophysical columns including thermal conductivity, heat production rate and porosity, and presents the formation mechanism of the depression layer-controlled geothermal system in the Songliao Basin. The petrophysical properties of Songliao Basin show obvious vertical stratification. According to the vertical changes, it can be divided into four sections, namely, cap rock section, reservoir section, steady-state heat conduction section and base section. The thermal conductivity of the basin varies greatly with the lithology and different sedimentary ages. Generally, it increases with the depth. In the reservoir section the thermal conductivity increases rapidly, while in the base section it differs widely. The heat production rate is broadly low in the Cretaceous sedimentary layer, demonstrating a thermal structure where the crust is cold while the mantle is hot. The porosity decreases rapidly from 1800 m to 2700 m in the reservoir section, and the water storage capacity of the section weakens accordingly. The geothermal system in the Songliao Basin is characterized by being controlled by the depression layer. The thermal uplift formed by the Moho surface uplift in the Middle and Late Jurassic later led to the double structure of fracture-depression in the shallow part of the basin. In the deposition stage of the depressions, sandstone-mudstone strata of the river-lake facies deposited in the Songliao Basin. Later on, with the circulation supply and heat accumulation of groundwater, a sandstone-dominated layer-controlled geothermal system was developed in the Yaojia Formation (Coniacian-Santonian), Qingbaikou Formation (Cenomanian-Turonian) and Quantou Formation (Albain) of the cretaceous strata, which gradually thinned spatially from the basin edge to the basin center. Finding high-permeability thermal reservoirs is the key to exploring geothermal energy resources in the Songliao Basin. This study may serve as a foundation for the discovery of geothermal resources deep in the Songliao Basin. |
| WANG Gui-ling,MA Feng,HOU He-sheng,JIANG Guang-zheng,ZHANG Xin-yong,YUAN Ruo-xi,LI Chu-tong.2023.Study of Depression and Layer Controlled Geothermal System in Songliao Basin[J].Acta Geoscientica Sinica,44(1):21-32. |
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