Geophysical exploration and resource potential analysis of dry hot rocks in southeast Guangxi
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摘要:
研究目的 针对广西干热岩资源探测研究不足的现状，重点围绕桂东南地区开展综合地球物理勘查与研究，探究干热岩资源潜力，进一步提高该地区在该领域的研究工作程度，助力广西能源结构转型升级。
研究方法 基于研究区地球物理场特征，综合运用大地电磁法开展深部探测工作，并结合干热岩地质研究成果，系统分析区域断裂与深部热源通道，通过地球物理与地热地质资料耦合分析，探讨深部结构面埋深及隐伏岩体存在的可能性。
研究结果 通过研究分析，识别出多条深大断裂作为深部热源通道，发现西场盆地底部存在隐伏岩体，埋深3~5 km，规模达数百平方千米。经热储法估算，西场盆地干热岩资源量为182.48×1015 J，折合标准煤622.63×104 t，按20%的采收率，干热岩资源量可开采量为36.5×1015 J，折合标准煤124.53×104 t，占2018年广西全区能源生产总量的3.31%。
结论 桂东南地区干热岩地热资源前景优越，西场盆地为理想的有利远景区，具备进一步开展调查勘探与开发利用的价值。
Abstract:Objective In response to the current situation of insufficient exploration and research on dry hot rock resources in Guangxi, this study focuses on carrying out comprehensive geophysical exploration and comprehensive research in the southeastern Guangxi region to explore its dry hot rock resource potential, further improve the research work level in this field in the region, and assist in the transformation and upgrading of Guangxi's energy structure.
Methods Based on the characteristics of the geophysical field in the study area, magnetotelluric methods are comprehensively used to carry out deep exploration work. Combined with the geological research achievements of dry hot rocks, the regional faults and deep heat source channels are systematically analyzed. Through the coupling analysis of geophysical and geothermal geological data, the burial depth of deep structural planes and the possibility of the existence of hidden rock masses are discussed.
Results Through research and analysis, multiple deep and large faults are identified as deep heat source channels, and hidden rock masses are found at the bottom of the Xichang Basin, with a burial depth of 3~5 km and a scale of hundreds of square kilometers. According to the thermal reservoir method estimation, the dry hot rock resource amount in the Xichang Basin is 182.48×1015 J, equivalent to 622.63×104 tons of standard coal. Calculated based on a 20% recovery rate, the recoverable amount of dry hot rock resources is 36.5×1015 J, equivalent to 124.53×104 tons of standard coal, accounting for 3.31% of the total energy production in Guangxi in 2018.
Conclusions The geothermal resources of dry hot rocks in the southeastern Guangxi region have a superior prospect, and the Xichang Basin is an ideal favorable remote exploration area, with the value of carrying out further investigation, exploration, and development and utilization.
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图 6 广西部分深部钻井测温曲线图（据康志强等，2020a修改）
Figure 6.
表 1 研究区部分钻孔地温梯度统计结果（据康志强等，2020a）
Table 1. List of geothermal gradient statistics for some boreholes in the study area
构造单元 钻孔 井深/m 测温深度/m 地温梯度/（℃/100 m） 分段实测值 平均计算值 西场凹陷 西1井 2800.00 123~800 1.85 2.55 800~1204 1.25 1204~1520 3.04 1520~2540 1.91 西参2井 2409.07 914~1500 4.40 3.29 1500~2404 3.63 路1井 1500.00 — — 3.25 亚1井 1700.00 — — 3.67 常乐凹陷 乐参1井 2698.49 56~95 2.05 3.14 95~115 3.50 133~178 2.22 178~207 3.10 
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表 2 广西地层结构及其密度特征
Table 2. Stratigraphic structure and density characteristics in Guangxi
名称 编号 分层 深度范围/km 密度范围/（103 kg·m−3） 地壳 A — 0~35 2.70~3.00 M界面（莫霍界面） 地幔 B 上地幔 35~400 3.32~3.65 C 转变区 400~1000 3.65~4.68 D 下地幔 1000~2900 4.68~5.69 G界面（核—幔边界） 地核 E 外核 2900~4980 9.40~11.50 F 过渡层 4980~5120 11.50~12.00 G 内核 5120~6371 12.00~12.30
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表 3 桂东南地区地层电阻率统计结果
Table 3. Statistic table of formation resistivity in Southeast Guangxi
构造分区 地层层位 代号 电阻率/（Ω·m） 低阻层 高阻层 云开隆起带 上白垩统 K2 50 — 中泥盆统东岗岭组 D2d — 6×104 寒武系黄洞口组 ∈h — 103 加里东期混合岩 P2γ3 — 103 钦州华力西褶皱带 下白垩统新隆组 K1x 15 — 中侏罗统 J2 30 — 下三叠统 T1 90 — 上二叠统—下泥盆统 P2−D1 — 103~104 中志留统合浦组—
下志留统连滩组S2h−S1l 20~80 — 中奥陶统 O2 — 6×103
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