| 松辽盆地坳陷层控地热系统研究 |
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| 引用本文：王贵玲,马峰,侯贺晟,姜光政,张心勇,原若溪,黎楚童.2023.松辽盆地坳陷层控地热系统研究[J].地球学报,44(1):21-32. |
| DOI：10.3975/cagsb.2022.121901 |
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| 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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| 中文摘要:松辽盆地是在印支运动末期至燕山运动早期形成的大型沉积盆地, 其不仅蕴藏丰富的油气资源, 也是我国主要的地热资源潜力区。本文以大陆科学钻探松科二井为基础通过建立盆地热导率、生热率、孔隙度等物性柱, 分析了盆地深部地温场特征, 最后给出了松辽盆地坳陷层控型地热系统的形成机制。松辽盆地物性具有明显的垂向分层特征, 按照垂向变化可分为4段, 分别为盖层段、储层段、稳态热传导段和基底段。热导率随岩性、沉积时代的不同存在较大的差异, 总体上随深度的变大逐渐增大, 储层段表现出热导率的快速增长, 而基底段则热导率差异性大; 生热率在白垩系沉积层总体偏低, 表现出“冷壳热幔”的热结构; 孔隙度表现为从1800 m到2700 m的储层段快速下降趋势, 地层储水能力逐渐变弱。松辽盆地地热系统具有坳陷层控的特点, 中、晚侏罗世莫霍面隆起形成的热隆张导致了后期浅部的断陷-坳陷双重结构。在坳陷沉积阶段沉积了河湖相为主的砂、泥岩地层, 后期随着地下水的循环补给及聚热作用, 在白垩系姚家组、青山口组、泉头组中形成了以砂岩为主且空间上由盆地边缘向盆地中心逐渐变薄的层控型地热系统。寻找高渗透热储层是松辽盆地地热探测的关键, 本研究可以为盆地深部找热提供基本的思路和理论支撑。 |
| 中文关键词:松辽盆地 控热模式 松科二井 热物性 |
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| Study of Depression and Layer Controlled Geothermal System in Songliao Basin |
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| Abstract: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. |
| keywords:Songliao Basin heat control mode Songke II well thermal properties |
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