Surface geochemical anomaly pattern of medium-to-high temperature geothermal systems in South China and its application

The existence of thermal storage will correspondingly increase the temperature of surrounding strata and promote the continuous expansion,volatilization,upward migration,and loss of gas in the strata.As a result,a low-concentration gas field will be formed in the strata above geothermal reservoirs.Geothermal reservoirs could in turn heat formation water and increase the solubility of soluble inorganic salts in the surrounding rocks and the total dissolved solids(TDS)content in the formation water.Since water can strongly wet and permeate strata,the dissolved inorganic salts migrate into upper strata along with water,giving rise to the formation of a high-concentration inorganic salt field in the strata above geothermal reservoirs.A higher geothermal reservoir temperature corresponds to more significant characteristics mentioned above.Therefore,a medium-to-high temperature geothermal system has a surface geochemical anomaly pattern of high inorganic salt concentrations and low gas concentrations(also referred to as the high-salt and low-gas pattern).This pattern is applied to the surface geochemical exploration of the two geothermal fields in Guangdong Province,i.e.,the Huangshadong geothermal field in Huizhou City and the Xinzhou geothermal field in Yangjiang City,revealing low-concentration gas fields above both.The application results also show that the exposed thermal spring water in both geological fields has higher concentration of dissolved inorganic salt than the surface water and nearby seawater,forming high-amplitude anomalies on the surface above geothermal reservoirs.These characteristics,as well as the measured temperature at known geothermal wells,verify the validity of the high-salt and low-gas pattern of medium-to-high temperature geothermal systems proposed in this study.Moreover,the high-salt and low-gas pattern proposed predicts three favorable medium-to-high temperature geothermal zones in the surface geochemical exploration of the Shiba Basin near the Huangshadong geothermal field.

RESEARCH ON DISTURBED MECHANISM OF THERMAL NOISES OF THE SURFACE IN ABRUPT GEOTHERMAL ANOMALY

Geothermal anomaly as a physical phenomenon of an active and latent volca nic area would be well recog-nized,and abrupt geothermal anomaly should also be understood.However,in practical work,thermal infrare d remote sensing techniques are frequently u sed to monitor geothermal flows of th e earth.But then,except for this typ e of thermal source in the surface thermal field,there still exist a lot of noises in th e area where the abrupt geothermal an omaly is generat-ed.By Analyzing the reason,we find t hat it is brought about by the non-bou ndless projection characteristics of objects.These noises may be divided into two c lasses:system noises and random noises.If disturbed noises have comparative sta-ble time sequence law and space sequence law,the noises are called system noises.And because system noises have a certain law,it is easy to remove the n oises.On the contrary,if disturbed noises have not law of time sequence a nd space sequence,the noises are called random noises.The random noises have the character of non-linearity,uncertainty and indeterminism.For this case,this p aper discusses the disturbed mechan ism of these noises as well as how to re move them..

STUDY ON TRANSMISSION MECHANISM OF THERMAL INFRARED REMOTE SENSING FOR ABRUPT GEOTHERMAL ANOMALY IN VOLCANIC REGION

Experiment researches have proven that there is an obvious phenomenon of abrupt geothermal anomaly in volcanic region in the forewarning period of volcano eruption, which is closely related to the geological structure, the cause, the scale and the type of volcano etc. On the other hand, this kind of geothermal anomaly is an important sign to monitor volcano activity by thermal infrared remote sensing techniques. This paper discusses the feature of abrupt geothermal anomaly, the transmission mechanism of geothermal anomaly and the radiation transmission mechanism of heat field of terrene in volcanic region. By analyzing mechanism of terrene temperature rising by way of conduction and convection of heat, we have presented the transmission equation of atmosphere for thermal infrared radiation based on the effective radiation of objects. The related problems of noise interference in the processes of transmission for thermal infrared radiation will be discussed in the later paper.

Integrated application of gravity,aeromagnetic,and electromagnetic methods in exploring the Ganzi geothermal field,Sichuan Province,China

The Ganzi geothermal field is located in the Songpan-Ganzi orogenic belt in Sichuan Province.Many hot springs are exposed along the Yalahe valley in Ganzi geothermal field,which is a favorable area for hightemperature geothermal resource exploration.However,the geological model of heat exchange,the regional structure controlling hydrothermal convection and the development model of geothermal reservoirs are still unclear.Therefore,further studies are necessary to meet the geothermal exploration requirements in the middle and deep strata of this geothermal field.In this study,a geological model of the geothermal system of Ganzi geothermal field is proposed.We are convinced that there exists a hydrothermal convection system in the Ganzi geothermal field,the heat transfer of which is accomplished through deep-rooted major faults.Therefore,the identification of deep-rooted major faults and the description of geothermal reservoirs are the research objects of the integrated geophysical methods.The main factors controlling the geothermal reservoirs in the deep-rooted Xianshuihe major fault and Yalahe fault zones are analyzed by using gravity,aeromagnetic,and electromagnetic methods and techniques.The analysis results of regional gravity and aeromagnetic anomalies show that the Xianshuihe major fault has produced obvious gravity and aeromagnetic anomalies on the surface,and thus the position and strike of this fault can be accurately predicted by inversion of the aeromagnetic anomalies.Geothermal reservoirs show low-resistivity anomalies in the electromagnetic profile.The inversion results of the controlled source audio-frequency magnetotelluric(CSAMT)data show that geothermal reservoirs are mainly developed along the Yalahe valley,and the west side of the valley is more favorable for geothermal exploration.This study is of guiding significance to the efficient exploitation and utilization of the Ganzi geothermal field.

谷露地热田热结构初探及高温异常区预测

谷露地热田是西藏那曲—尼木地热带上典型的高温地热田。对其地下热结构展开深入研究,并建立准确的温度结构模型,具有重要的实用和科学价值。基于经典电阻率和温度转换经验公式,以钻孔处实测温度值和电阻率值作为估算标准,以电阻率比值和深度分层约束为指导思想,建立了适用于谷露地热田的电阻率与温度转换经验公式,并确定了相关经验系数。通过评估音频大地电磁测深剖面电阻率反演结果的有效性,以及钻孔处温度实测值和估算值之间的拟合优度,评价了此次温度估算方法的合理性,并进行了反演电阻率到温度的转换计算。计算结果成功构建了两条音频大地电磁测深剖面所示区域内的地下温度结构模型,并基于此进行了成矿预测。结果表明:Ⅲ号高温异常区与已知钻探成果相符。因此,推断在两条剖面上存在4个浅部高温异常区(Ⅰ、Ⅱ、Ⅳ和Ⅴ)和3个深部高温异常区(Ⅵ、Ⅶ和Ⅸ);其中Ⅶ号异常与F4-2断裂的空间分布密切相关,并存在由深部向上运移的趋势,推断该处温度异常存在较大可能为深部热储的反映。而Ⅵ和Ⅸ号异常则与F4-1断裂密切相关,为下一步勘探提供了新目标。需要注意的是,本次计算基于主要岩性为花岗岩而得出相关经验系数,在不同勘探区域使用时需根据实际岩性和钻孔测温结果重新确定转换公式中所需参数。

基于Landsat8的凤永高速地表温度反演

在隧道建设过程中,高地温热害会影响机械设备效率和施工进度,还会恶化作业环境、对人员安全造成威胁,因此,精准识别地热异常区对隧道建设非常重要。热红外遥感是用遥感的方法探测地球表面的温度,以此为基础利用遥感技术反演地表温度愈发可靠。以云南省凤永高速凤庆-领岗地隧道为研究区域,采用Landsat8影像数据,运用大气校正法对研究区进行地表温度反演,再利用DEM数据制作地形坡向文件,按阳坡、阴坡分布提取地表温度,结合地质构造对地表温度异常进行分析,圈定地热异常区。

水文地球化学方法在地热资源勘查中的应用:以湖北省应城市为例

地热流体水文地球化学研究在指示地热资源的形成机制、赋存环境以及预测地热资源有利勘查区等方面具有广泛应用。为了探究湖北省应城市地热系统的热源以及成因机制,并对其地热异常区进行圈定。基于研究区内地热水与浅层地下冷水的水化学及同位素特征,探讨了地热流体中主要组分的地球化学起源,评估了地热流体的热储温度。结合区内浅层地下冷水的温度与水化学数据,对地热异常区进行了圈定。研究结果表明,地热水水化学类型主要为SO 4-Ca型,地热系统主要的热储围岩为海相碳酸盐岩,通过地热温标计算热储温度约112.2℃。大气降水入渗和碳酸盐岩热储层中的水-岩相互作用是地热水中化学组分的主要来源。地热水的水化学和氢氧同位素特征指示地热水的补给来源为研究区西部山区的大气降水,大气降水由补给区入渗后向东南盆地中心不断运移,循环深度为3436.7~5030.2 m。通过与典型岩浆热源型地热系统的对比以及岩石样品中放射性元素的数据结果,得出应城地热系统是由地温梯度正常加热而形成的。结合区内浅层地下冷水的温度与水化学数据,最终圈定地热异常区位于应城市区西南陈河镇以北地区,但仍需考虑井深、人为污染等客观限制因素对圈定结果的影响。

甘肃省平凉市中心城区土壤源浅层地温能赋存规律研究

研究区属陇东盆地,该区域大地热流值平均值为55.78 mW/m^(2),其中平凉市一般在41.57~80.87 mW/m^(2)之间。根据大地热流值判断平凉市浅层平均温度的分布基本为西南高、东北低,而恒温层在地表以下20~25 m处,该层温度在10.6~11.2℃之间。通过恒功率加热试验研究得出:小功率加热试验热导率3.61 W/(m·℃),每延米换热量44.47 W/m;大功率加热试验热导率2.91 W/(m·℃),每延米换热量71.15 W/m。加热恒温度试验得出:在夏季制冷模拟实际工况下的每延米换热量为53.44 W/m。研究结果可作为地源热泵设计和地埋管长度计算的依据。

福建沿海地区地热异常热源成因的地球物理分析

福建沿海地区是我国东南丘陵沿海地带重要的地热异常区,其成因机制、热源构成一直是我国地热学界关注的重要课题。本文利用热、震、磁、重资料分析了该区地热异常的成因及热量来源。结果表明:福建沿海地区剪切波“低速走廊”与政和—大埔断裂带和滨海断裂带在深部形成的铲形逆冲断层相关,其东端向下至环太平洋地热带高温热源区,西端向上至漳州、福州地表地热异常区。居里面至莫霍面之间,地温增温平缓,不具备形成现代侵入岩体异常热源的条件。花岗岩放射性生热是地表热异常的重要组成部分,放射性元素热源深度小于5 km,地下水沿导热构造“汲取”围岩放射性生热量,向热田中心汇集形成高温区。我们认为:福建沿海地热异常区的热能由深、浅两种来源组成,深部热能来源于环太平洋高温岩浆,浅部热能来源于花岗岩放射性元素生热。深部热源的热量顺铲形逆冲断层向上传输到地表,浅部热源的热量由地下水汇集到地热田中心。

Geological factors controlling deep geothermal anomalies in the Qianjiaying Mine,China

Here,the geological factors controlling deep geothermal anomalies in mines were studied based on the geotemperature,lithologic thermal conductivity,and related geological data collected from the Qianjiaying Mine,China.A simulation of the change in magma waste heat,conducted using the ANSYS Workbench,revealed the distribution characteristics of geothermal anomalies in this mine and the corresponding geological control factors.The results revealed the following points.(1)First-degree heat hazard level(temperature=31-37℃)occurred in the central and southwestern parts of the mine at an^600-m depth,while second-degree heat hazard level(temperature≥37℃)occurred at an^800-m depth.The geotemperature and geothermal gradient in the southwestern part of the mine were anomalously high.(2)The geotemperatures measured in the mine generally reflected a standard increase with depth,while the geothermal gradient remained unchanged with depth.The geothermal gradient and its average value in the study area were 0.70-4.23 and 2.12C·hm^-1,respectively.(3)A combination of stratum characteristics,geological structure,and groundwater characteristics led to geothermal anomalies in mines;additionally,the waste heat from magma had no significant effect on the geothermal field.

Simultaneous Modelling of Gravity and Magnetic Data in a Measured Heat Flux Area to Characterize Geothermal Heat Sources: A Case for Eburru Geothermal Complex, Kenya

Forward modelling of gravity and magnetic data was done simultaneously to show the correlation between gravity and magnetic anomalies on a measured heat flux region. The results were used to characterize the heat source structures in Eburru area. Modelling was done using Oasis montaj geosoft software which is an iteration process where the gravity and magnetic anomalies were calculated and compared to the observed residual anomaly until there was a fit. The start model was constructed based on depths from Euler deconvolution and models constrained using stratigraphy data from the existing wells in the study area. Forward modelling of gravity and magnetic data revealed intrusions within the Earth’s subsurface with depth to the top of the sources ranging from 739 m to 5811 m. The density of the sources ranges between 3.0 g/cm3 and 3.2 g/cm3 while their magnetic susceptibility was zero. This implies that intrusions from the mantle with a magnetic susceptibility of zero have temperatures exceeding the curie temperature of rocks. The density of the intrusions modelled was higher than 2.67 g/cm3, the average crustal density, hence it explains the observed positive gravity anomaly. The results also revealed that areas with high heat flux have shallow heat sources and if the heat sources are deep, then there must be a good heat transfer mechanism to the surface.

Depth Estimation of Geothermal Heat Structures by Euler Deconvolution of Gravity Data at Eburru Area, Kenya

Gravity survey was done at the Eburru area to estimate the source depth locations and delineate the fault boundaries using 3D Euler deconvolution. Gravity data was collected using CG-5 gravimeter. Gravity data reductions were done by applying drift correction, latitude correction, free air correction, Bouguer correction and terrain correction to the observed raw data to obtain complete bouguer anomaly (CBA). The CBA data was transferred to Oasis montaj software for Euler deconvolution processing. The 3D Euler deconvolution was carried out to determine and estimate the depth of the density bodies. Euler deconvolution locates the gravity anomaly source and estimates its depth from the gravity observation level. Euler deconvolution was preferred to other filtering methods in this study as solutions are only determined over identified analytic signal peaks, the window size varies according to anomaly size and the final solution involves only a few more precise depth estimates. The Euler deconvolution was performed using structural indices of 0.5, 1.0 and 2.0. Results from this analysis indicated that the CBA values in this study area range from gravity values of -272 mGal to -286 mGal and residual Bouguer anomaly amplitude range between -3 mGal and 3.4 mGal. The 0.5, 1.0 and 2.0 structural indices generated five solutions at depth range of 433 m - 2269 m, 801 m - 1433 m and 1170 m - 2246 m respectively occurring almost at the same locations on gravity highs. The deep structures were observed to occur in the northern part of the study area, and interpreted to be dense intruding masses likely to be trapped by the overlying cap rock at these depths. These could be geothermal heat sources that can be exploited to generate geothermal energy.

沁水盆地煤储层地温场条件及其低地温异常区形成机理

煤储层地温场条件是影响煤层气赋存与产出的关键因素,从目前沁水盆地煤层气井生产情况来看,煤储层地温低异常区煤层气开发井的产气效果普遍较差,因此,开展煤储层地温场条件研究,揭示低地温异常区形成机理,对于低地温区煤层气开发显得尤为重要。采用沁水盆地煤层气井地温实测数据,系统分析了沁水盆地3号煤层和15号煤层地温及其梯度和大地热流分布特征,揭示了煤储层地温分布规律,提出了煤储层地温梯度等级划分标准,圈定了沁水盆地石炭-二叠系煤储层地温梯度小于1.6℃/hm的地温低异常区,揭示了研究区煤储层地温低异常区分布及其受控机制。研究结果表明,沁水盆地恒温带温度整体呈现由西北向东南逐渐增高的趋势,恒温带深度由北向南逐渐变浅,恒温带温度为13.2~15.2℃,恒温带深度为27.4~33.1 m。沁水盆地煤储层地温及其地温梯度均随深度的增加而增高。3号煤储层温度为14.6~100.9℃,平均为30.58℃,地温梯度为0.008~3.770℃/hm,平均为1.62℃/hm;15号煤储层温度为15.3~111.8℃,平均值为33.28℃,地温梯度为0.046~5.350℃/hm,平均为1.87℃/hm;大地热流值为0.93~94.60 mW/m^(2),平均为41.5 mW/m^(2),低于我国大陆地区平均热流值(63 mW/m^(2)),反映出本区处于稳定的构造-热状态之中。根据地温梯度,圈定了研究区3号和15号煤储层地温梯度小于1.6℃/hm的地温低异常区呈条带状分布于盆地东北和东部一带,面积分别占盆地总面积25.2%和27.9%,煤层气资源量近1.0万亿m3。煤储层地温梯度随着底板标高的增加而线性降低,随着煤储层有效埋深的增加而线性增加;进一步揭示了地壳抬升剥蚀作用和地下水补给与渗流作用对研究区煤储层地温低异常区的控制机理。

Tectonic Control of the Theistareykir Geothermal Field by Rift and Transform Zones in North Iceland:A Multidisciplinary Approach

This paper presents a multidisciplinary structural analysis of a 165 km2 area in the Northern Rift Zone and the Tjörnes Fracture Zone of Iceland, and unravels the tectonic control of the Theistareykir geothermal field and its surroundings. About 10729 fracture segments (faults, open fractures, joints) are identified in the upper Tertiary to Holocene igneous series. The segments were extracted from aerial images and hillshade, and then analyzed in terms of number of sets, geometry, motions, frequency, and relative age. The correlation with surface geothermal manifestations, resistivity, earthquakes, and occasional well data reveals the critical regional and local fractures at the surface, reservoir level and greater depth. The main conclusions of this study are: 1) The structural pattern consists of N-S rift-parallel extensional fractures and the Riedel shears of the transform zone striking NNE, ENE, E-W, WNW and NW, which compartmentalize together the blocks at any scale. 2) The en échelon segmentation shows strike and oblique slips on the Riedel shears, with a dextral component on the WNW and NW planes and a sinistral component on the NNE to ENE faults. 3) Fractures form under the influence of the transform mechanism and the effect of rifting becomes significant only with time. 4) The WNW dextral oblique-slip Stórihver Fault of the transform zone has a horsetail splay that extends eastwards into the geothermal field. There, this structure, along with few NW, ENE, NNE and N-S fractures, controls the alteration, alignment of fumaroles, emanating deep gases. These fractures also rupture during natural or induced earthquakes. 5) The resistivity anomalies present en échelon geometries controlled by the six fracture sets. These anomalies display clockwise and anticlockwise rotations within the upper 8 km crustal depth, but at 8 km depth, only three sets (the N-S rift structures, and the E-W and the NW Riedel shears) are present at the rift and transform plate boundaries. Results of this study are relevant to resource exploration in other complex extensional contexts where rift and transform interact.ööö

广西地热资源特征与潜力评价

【研究目的】广西地热资源分布广泛,是一种极具竞争力的低碳可再生清洁能源。目前,针对广西地热资源赋存规律、分布特征和资源潜力的系统性研究相对薄弱,在一定程度上制约了广西地热资源的综合性开发和利用。【研究方法】本文基于“十二五”以来广西浅层地温、水热型和干热型地热资源调查评价最新成果,对广西壳幔圈层结构、现今地温场特征和地热资源分布规律进行系统性分析;采用不同的资源量估算方法,分别对浅层地热能资源、水热型地热资源和干热型地热资源的开发利用潜力进行评价。【研究结果】研究表明,广西地热资源丰富,发育明显的赋存规律和分区分带性特征。其中,广西浅层地热能资源和水热型地热资源均以直接利用为主要开发方式,13个主要城市浅层地热能资源总热容量为1.23×10^(15)kJ/℃,年可开采利用资源量为1.36×10^(12)kJ/a,折合标准煤1.67×10^(8)t;广西现有温(热)泉出露点24处,地热开采井28口,地热能资源总量为2.56×10^(17)kJ,折合标准煤87.58×10^(8)t;地热流体年可采热量为28.89×10^(12)kJ/a,折合标准煤315.65×10^(4)t。广西干热型地热资源量潜力巨大,陆域3~10 km范围内干热岩资源总量为55.42×10^(4)EJ,折合标准煤18.91×10^(12)t,按2%的可采率计算是中国2020年一次能源消耗总量(49.8亿t)的75.94倍,是最理想的传统化石能源的接替载体。【结论】广西在传统能源领域“缺煤、少油、乏气”,但在新能源领域具有“风大、水足、热持久”的优势,对地热资源的合理开发利用将有助于广西能源结构的优化和产业结构的战略性调整,助力于中国“双碳”目标的达成。

中国东部地热异常区深层高温分布特征与动力学背景

中国东部的东北地热异常区、华北及华东地热异常区、东南丘陵-沿海地热异常区是中国重要的地热资源区,研究其深部地温分布特征与动力学背景对合理开发、高效利用地热资源具有重要的科学意义。中国东部自北向南,地热地质条件及热源成因各不相同。东北地区地热资源主要分布在长白山、松辽盆地、二连盆地以及依兰-伊通裂谷地堑,是火山、裂谷地堑、深断裂活动区,其深部热源与地温分布主要与西太平洋现代俯冲板片的岩浆活动有关。华北及华东地区地热资源主要分布在渤海湾盆地、南华北盆地群、郯庐断裂带的临沂-郯城段以及苏北盆地,是裂谷地堑、活动深断裂、岩溶热储发育区,其深部热源及地温分布主要与青藏高原东向挤出、太平洋俯冲后撤导致的盆地伸展、断陷以及深大断裂带走滑活动有关。东南丘陵-沿海地区地热资源主要分布在广东中西部、江西中南部以及福建东北部,是火山、岩体放射性高值区,其深部热源及地温分布主要与南海张裂、岩石圈减薄的岩浆活动有关。深部地温及居里面计算结果表明:中国东部地热异常区热流值≥80 mW/m^(2)的点在10 km深度的地温分别为,东北260~360℃,华北及华东270~400℃,东南丘陵-沿海地区260~340℃。在居里温度统一取475℃的条件下,居里面深度分别为:东北14.7~23.7 km,平均20.5 km;华北及华东18.4~26.5 km,平均22.1 km;东南丘陵-沿海地区16.9~24.9 km,平均21.9 km。综合分析认为,中国东部存在3种不同特征的地热资源区:长白山、东营等地,浅层地温高,居里面浅,地幔热源浅;松辽盆地中部的大安-大庆之间、渤中坳陷北侧的唐山等地,浅层地温高,但居里面深,地幔热源深;泉州-漳州之间浅层地温低,但居里面浅,地幔热源浅。

基于重磁异常的北京副中心地质构造特征和地热控制作用研究

重磁勘探对于分析地热系统特征和成因十分重要。北京城市副中心当前地热开发程度较低,为给地热资源可持续利用提供依据,对近期完成的1:50000高精度区域重力测量资料,开展了场源边缘检测、2.5D剖面反演和三维反演计算。利用归一化Theta图垂向导数和一阶水平方向导数获得了精度更高的断裂位置,研究了断裂汇交特征;使用频率域Parker-Oldenburg方法反演获得了两条不同方向剖面的基岩起伏形态;使用信赖域反演算法获得了5 km以浅地层三维视密度异常特征。在此基础上结合1:100000航磁和钻孔资料分析,综合研究了副中心地质构造特征及其地热控制作用,得到结论如下:(1)研究区断裂构造以近NE向和NW向为主。NE向断裂延伸较远、梯度带宽,但被NW向断裂切割改造迹象明显。(2)太古界结晶基底差异性隆升使区内储层和盖层厚度变化大。研究区南部隆起区蓟县系储层厚度变薄或缺失。新生界盖层在隆起区厚度为200~800 m,在断陷盆地区达2000 m以上。(3)南苑—通县断裂和夏垫断裂是区内良好导热构造;NW向台湖断裂、张家湾断裂与NE向燕郊断裂、姚辛庄断裂是主要导水通道,与南苑—通县断裂和夏垫断裂交汇形成区内地热资源的主要补给径流通道。区内地热异常受不同级次构造控制在赋存特征上呈现较大差异。

粤港澳大湾区地热异常空间分布特征的GIS分析

粤港澳大湾区地热资源丰富,研究地热异常空间分布特征可为大湾区地热资源潜力评价和勘探开发决策提供科学支撑.基于地理信息系统技术构建了粤港澳大湾区大地热流、花岗岩分布、断裂、布格重力异常、航磁异常和居里面深度等空间数据层,综合分析地热异常与地质和地球物理场特征的空间关联关系,揭示研究区地热异常的空间分布特征.分析结果表明,研究区内大地热流值大于75 mW/m^(2)、燕山期花岗岩边界或内部、与主断裂距离小于3 km、布格重力异常梯度大于1.6 mGal/km、航磁异常值为-5~5 nT及居里面深度小于15 km等区域,与地热异常区的空间关联密切;强地热异常的出现与居里面深度、燕山期花岗岩和主断裂关系最为密切.基于数据层分类,采用证据权重模型和加权信息量模型两种矿产资源预测方法对上述多元信息进行复合分析.研究表明,研究区内燕山期花岗岩分布广泛且岩石热导率较高的低山或丘陵区地区易出现强地热异常,具有这一特征的江门西部、肇庆中部、广州东北部、惠州东北部以及深圳等地的是粤港澳大湾区地热资源高潜力区.

新疆尼勒克1812年地震地质灾害遥感解译研究

为研究新疆尼勒克1812年地震地质灾害特征,基于多源、多时域、多尺度遥感影像对喀什河沿线主要地质灾害进行解译,对地温异常进行目视解译和遥感定量提取,对地震断层进行多源高分辨率详细解译。结合地震地质灾害解译结果、断层特征、地温异常、航磁异常等进行综合讨论,结果对喀什河流域基础地质研究提供一定参考。