APPLICATION OF 3D VISUALIZATION TECHNOLOGY IN GEOTHERMAL RESOURCES DEVELOPMENT IN SHENBEI BASIN
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摘要:
利用沈阳北部地热田以往钻孔、重力、可控源大地电磁测深测量结果，建立沈北地热田热储概念模型和综合地球物理三维可视化模型，使用布格重力异常模拟沈北盆地形态提取更多有用信息，总结以往失败钻孔的原因，圈定了新的找矿远景区，提高了探测结果的可应用性，提升地热找矿效果.
Abstract:Based on the previous results of borehole, gravity and controlled-source magnetotelluric (MT) sounding of geothermal fields in northern Shenyang City, the paper establishes the heat reservoir conceptual model of Shenbei geothermal field and comprehensive geophysical 3D visualization model, and simulates the morphology of Shenbei Basin to extract more useful information through Bouguer gravity anomaly. By summarizing the reasons for failed drilling in the past, a new prospecting potential area is delineated, which improves the applicability of exploring results and geothermal prospecting effect.
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Key words:
- geotherm /
- integrated geophysical method /
- 3D visualization /
- Bouguer gravity anomaly /
- Shenbei Basin
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表 1 地热勘探的地球物理方法及数据用途
Table 1. Geophysical methods and uses of geothermal prospecting
勘探方法 用途 局限性 重力 确定盆地的地质构造构架袁圈定盆地总体轮廓袁划分次级凹陷和凸起 无法明确判断断层的大小尧性质和准确位置 磁法 划分地层尧岩体袁识别断裂袁具有简单尧快速尧准确的优势 深大断裂的位置和深度确定不够准确 可控源音频大地电磁法 圈定地热异常范围和热储体的空间分布曰确定地热田的基底起伏及隐伏断裂的空间展布曰确定地热蚀变带曰圈定地下水的赋存位置 无法准确确定构造位置袁无法判明层位的准确深度 二维地震 确定古近系和新近系厚度及基底界面深度袁盆地基底的起伏形态及太古宙结晶基底顶界面埋深袁隐伏断裂的空间展布 无法准确识别地层的赋水性及断层的导水尧富水性 
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表 2 已建地热井一览表
Table 2. List of drilled geothermal wells
子盆地 编号 井深/m 水量/（m3/d） 综合 盖层 热储层 井底温度/℃ 增温率/（℃/100 m） 厚度/m 底板温度/℃ 增温率/（℃/100 m） 厚度/m 温差/℃ 增温率/（℃/100 m） 新城子盆地 新南井 2509 1200 88 2.95 1000 53 2.65 35 35 3.15 颇家2 2891 1277 87.5 3.95 1425 50 2.55 37.5 道义盆地 道热1 2117 1180 67.3 2.77 1370 48 2.84 732 19.3 2.64 治安2 2569 1400 89.6 3.1 1893 69.2 113.8 20.4
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表 3 失败地热井一览表
Table 3. List of failed geothermal wells
子盆地 编号 井深/m 井底温度/℃ 水量/（m3/d） 失败原因 新城子盆地 颇家1 2810 34.5 至-2810m终孔，仍为蓟县系雾迷山组白云岩层位；测井曲线虽解释出多处含水层，但其泥质含量较高，有效孔隙率低，渗透率差，因此水量低 道义盆地 新参1井 1700 68 360 水量不理想 道热2 2504 实钻超过设计井深仍然没有打穿古近系地层（已见到木梳屯组玄武岩层位），与预计地层出现太大偏差，现该孔暂停
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