Geospatial Mapping of Singhbhum Shear Zone (SSZ) with Respect to Mineral Prospecting

Singhbhum Shear Zone is a highly mineralized zone having variety of minerals, predominantly those of uranium, copper and some sulphide minerals. From Remote Sensing data it is possible to decipher the regional lithology, tectonic fabric and also the geomorphic details of a terrain which aid precisely in targeting of metals and minerals. Mapping of mineralized zones can be done using Geospatial Technology in a GIS platform. The present study includes creation of various maps like lithological map, geomorphological map, contours and slope map using satellite data like IRS LISSIV and ASTER DEM which can be used to interprete and correlate the various mineral prospective zones in the study area. Even the alterations of the prevalent mineral zones can be mapped for further utilization strategies. The present work is based on the investigations being carried under ISROSAC Respond Project (Dept. of Space, Govt. of India SAC Code: OGP62, ISRO Code: 10/4/556).

Characteristics of Zhangsanying-Tongshanzi aeromagnetic anomaly zone and prospecting potential of iron deposits in northern Hebei,China

Based on the latest high-precision aeromagnetic data,an aeromagnetic anomaly zone is identified at Zhangsanying--Tongshanzi in northern Hebei Province.By the potential field conversion processing,including the reduction to the pole,vertical derivative,upward continuation and residual anomaly,the authors analyzed the characteristics of three typical aeromagnetic anomalies in Zhangsanying--Tongshanzi aeromagnetic anomaly zone and their geological origin.The methods include the forward and inversion methods,such as 2.5D optimization fitting and Euler deconvolution.Moreover,combined with the geological outcrop,known iron deposits,ground magnetic survey and verification,the authors studied the relationship between the aeromagnetic anomalies and iron deposits.The result shows that the Zhangsanying--Tongshanzi aeromagnetic anomaly zone is composed of 10 large magnetic anomalies with high amplitude and clear boundary.The aeromagnetic anomalies are comparable and intrinsically related to the ground magnetic anomalies and IP anomalies,indicating that the anomalies are caused by magnetite deposits.It has good magnetite prospecting potential in the Zhangsanying--Tongshanzi aeromagnetic anomaly zone.

Development and prospect of separated zone oil production technology

This article outlines the development of separated zone oil production in foreign countries,and details its development in China.According to the development process,production needs,technical characteristics and adaptability of oilfields in China,the development of separate zone oil production technology is divided into four stages:flowing well zonal oil production,mechanical recovery and water blocking,hydraulically adjustable zonal oil production,and intelligent zonal production.The principles,construction processes,adaptability,advantages and disadvantages of the technology are introduced in detail.Based on the actual production situation of the oilfields in China at present,three development directions of the technology are proposed.First,the real-time monitoring and adjustment level of separated zone oil production needs to be improved by developing downhole sensor technology and two-way communication technology between ground and downhole and enhancing full life cycle service capability and adaptability to horizontal wells.Second,an integrated platform of zonal oil production and management should be built using a digital artificial lifting system.Third,integration of injection and production should be implemented through large-scale application of zonal oil production and zonal water injection to improve matching and adjustment level between the injection and production parameters,thus making the development adjustment from"lag control"to"real-time optimization"and improving the development effect.

Copper-Polymetal Metallogenic Series and Prospecting Perspective of Eastern Section of Gangdise

Geological, geophysical, geochemical and remote sensing comprehensive studies show that big ore-prospecting potentiality is contained in the eastern section of the Gangdise Mountains, Tibet. There are various mineralization types with dominant types of porphyry and exhalation. According to their relations with tectonic evolution, they are divided into four kinds of metallogenic series as follows: magmatic type (Cr, Pt, Cu, Ni) and exhalation type (Cu, Pb, Zn, Ag) ore deposit series related to Neo-Tethys oceanic crust subduction action (125-96 Ma); epithermal type (Au, Ag, Pb, Zn, Sb), altered fractured rock type (Cu, Mo) and skarn rock type (Cu) ore deposit series related to arc-continental collision; porphyry type (Cu, Mo), cryptoexplosion breccia type (Cu, Au, Pb, Zn), shear zone type (Au, Ag, Sb) and skarn rock type (Cu, Fe) ore deposit series with relation to post-orogenic extensional strike-slip. From subductive complex to the north, zoning appears to be crystallization differentiation type (segregation type)-shear zone type (altered rock type)-skarn rock type, epithermal type-porphyry type-porphyry type and exhalation type-exhalation type-hydrothermal filling-replacement type. The ore deposit is characterized by multi-places from the same source, parity and multi-stage, hypabyssal rock from the deep source and poly genetic compound as a whole.

Assessment of CO_(2)storage prospect based on physical properties of Rio Bonito Formation rock units

The physical properties of the rock units associated with the Rio Bonito Formation are presented in this study with the focus on modelling reservoir quality based on petrophysics-derived parameters to evaluate CO_(2)storage potentials.It involves the modelling of the reservoir depths,thicknesses,flow zone indicators(FZI),and effective permeability(Keff)and presenting the CO_(2)storage efficiency factors peculiar to the rock units of the study location.Research results presented by this study for the stated objectives are not quite common in the region.Keff values range from 200 mD to higher than 2000 mD,and FZI values are generally above 1.0 mm and up to 13.0 mm within the portions covered by the drilled wells.The sandstone units recorded are up to 20 m thick in some cases.The Keff and FZI models indicate the sandstone reservoirs as permeable units to support the injection and circulation of CO_(2)within the potential reservoir units of the Rio Bonio Formation across São Paulo State.Apart from some points in the southeastern part of the study location,where the Rio Bonito are delineated at depths less than 800 m(minimum CO_(2)storage depth based on best practices),other portions are deeper,ranging from 950 m to 3500 m.Thin-bedded layers will affect the integrity of the rocks as CO_(2)storage tanks or reservoir seals/traps/overburden within the region.Sandstone bed thicknesses are up to 20 m in some cases.However,hybrid CO_(2)reservoir units are feasible,especially in portions where thin siltstone layers are sandwiched between sandstone units to provide considerable thicknesses based on CO_(2)storage standards.The current study shows that useable areas considering reservoir thickness,depth,and other physical qualities will significantly control the CO_(2)storage efficiency of the study location.Further studies featuring a detailed geophysical exploration of the site to confirm the availability and saturations of preexisting fluid(hydrocarbon and water)are encouraged to boost CO_(2)storage in the region.The related research-based results,as mentioned above,may be combined with the results of this research to determine the area's potentials for CO_(2)storage or hydrocarbon production with CO_(2)storage options.

新时代生态环境分区管控成果应用体系建设的思考

生态环境分区管控是实施生态环境分区域差异化精准管控的环境管理制度。建立和完善成果应用体系,推动成果广泛应用、落地见效,是保持制度生命力的根本所在。在系统辨识成果体系特征的基础上,立足制度建设新阶段应用要求,提出了应用体系框架,全面分析了成果应用前景;结合地方应用实践,分析了应用范围有待拓展、应用机制有待完善、成果本身有待优化、智能应用有待挖掘等不足,并提出了扩大引导宣传、完善制度保障、优化成果内容、强化平台支撑等方面的对策建议。

气体地球化学勘查在巴—麦地区砂岩型铀矿找矿中的应用

塔里木盆地内部砂岩型铀矿找矿十分迫切。针对该盆地地质构造相对复杂、沉积地层厚度大、勘查手段受到沙漠-荒漠地貌的限制、勘查程度较低和地表成矿信息弱的特点,在巴楚隆起—麦盖提斜坡带地区(巴—麦地区)开展能指示深部地层环境的H_(2)S、CH_(4)、H_(2)、CO_(2)和4He气体地球化学区域测量研究。结果表明,几种土壤气体浓度能够较为清晰地显示各自异常分布范围,并指示盆地地层中可能的铀异常信息,气体地球化学测量方法是一种相对高效的盆地区域地表勘查方法。在综合测区断裂分布、油气藏、水文等地质条件和气体化学反应性质的基础上,分析气体浓度异常成因及分布综合特征,测区东北部、东南部及色力布亚断裂和巴什托断裂所夹持部分地段具有几种气体组份浓度异常叠加,地层中可能发育氧化-还原地球化学障,是有利的找矿预测区,为该地区砂岩型铀矿勘查提供参考依据。

河南嵩县九仗沟金矿床地球化学特征与勘查模式

九仗沟金矿位于熊耳山—外方山矿集区内的蛮峪—店房金矿带北段,是典型的大型构造蚀变岩型金矿床。采用1/5万水系沉积物测量圈定了找矿靶区,1/1万土壤地球化学测量确定了矿化富集部位,岩石地球化学(原生晕)测量识别出构造破碎带和矿化强度,并预测矿体相对剥蚀程度。研究表明:不同尺度地球化学测量为该金矿勘查提供了不同阶段的找矿信息,找矿效果显著。其中,利用水系沉积物测量在九仗沟矿区范围内圈定了11-丙-Au异常,利用土壤地球化学测量发现了九仗沟1-甲_(1)-Au-Ag-Pb-Cu-Hg-As-Bi-Ni异常,利用原生晕剖面微量元素峰值部位确定了F_(1)构造矿化蚀变带。通过总结该矿床地球化学异常特征和找矿标志,建立了勘查地球化学模式,为区域及矿区周边相同类型的金矿勘查提供理论指导。

遥感技术在地质找矿中的应用及发展前景

遥感技术在地质找矿中具有广域观测、多源数据整合、非侵入性和非接触性、高时间分辨率、快速、高效和经济性等优势。它能帮助识别和定量化不同类型的矿物质,确定潜在的矿产资源。在地质找矿中,遥感技术主要应用于矿物识别、构造特征分析、矿化带探测和环境监测。未来,随着遥感技术的发展,地质找矿工作将进一步改进高分辨率图像获取、多光谱和高光谱遥感、雷达和LIDAR技术以及数据处理和分析技术,从而提高矿产勘探的效率和精度。总体而言,遥感技术在地质找矿中有广阔的应用前景。

湖南醴陵王家湾金矿床地质特征及成矿规律

王家湾金矿床位于扬子陆块江南造山带东南缘醴浏隆起带南源冲复式褶皱北段,成矿区带划分属于钦杭成矿带湖南段的湘东北亚段,处于浏阳—板杉铺金铜铅锌找矿远景区南段。矿体主要赋存于冷家溪群地层中,劈理化带是矿区内的导矿容矿构造,且已发现矿体大多受北西向劈理化带控制。矿石自然类型主要为原生矿石,工业类型为破碎蚀变岩型夹石英脉型。该矿床热液成矿作用可分为4个阶段,以石英-黄铁矿-毒砂-金阶段、石英-碳酸盐-多金属硫化物-银金矿阶段为主成矿阶段。硅化、黄铁矿化和毒砂矿化与金矿化关系密切。王家湾金矿床是以变质热液为主的中低温热液脉状金矿床。

鲁西北潘店重磁异常带矽卡岩型铁矿精细找矿方向——来自广域电磁法深部找矿的启示

山东省鲁西北潘店地区超深覆盖区航磁和重力异常明显,通过系统的重磁异常查证工作,在研究区重磁异常带开展的多个钻孔均取得了深部矽卡岩型铁矿床找矿突破,但由于重磁异常带范围较大且其特征不能直接指示找矿方向,造成部分钻孔不见矿或见矿情况差。因此,为了更好地在重磁异常带精细圈定成矿位置,实现新的更大的找矿大突破,本文旨在已查证的潘店重磁异常带开展广域电磁测深(WFEM)工作,结合钻探验证情况,圈定深覆盖区矽卡岩型铁矿深部成矿区间及成矿有利结构面,提出深部精细找矿方向。

安徽黄山休宁盆地地热资源开发利用远景区划研究

通过分析休宁盆地地热地质调查、遥感解译、水质分析等工作取得的主要成果,以休宁盆地内地质、深大断裂构造特征及水文地质条件为基础,结合黄山地区旅游文化资源和地热资源开发的可行性,以及地区经济发展的需求,划分了休宁盆地热田内4处地热开发利用远景区,估算了远景区地热资源储量,提出了地热资源开发利用区划目标与建议,为黄山地区进一步发展地热康养旅游奠定了基础。

四川石棉大渡河地区金矿带基于AMT的地质—地球物理找矿模型

四川石棉大渡河地区金矿带位于松潘—甘孜造山带南段稀有金属、贵金属和有色多金属成矿带,区内构造复杂,地形陡峻,严重制约找矿勘查的实践运用。本文总结区域成矿地质背景和条件、地球物理特征,以石棉县倮倮坪金矿为典型矿区,开展以音频大地电磁测深(AMT)为核心的地球物理深部勘查工作,圈出3个低电阻率异常体M1、M2和M3,与矿化蚀变带I号、金矿化带Ⅲ号和金铜矿体具有对应性,说明地球物理方法深部找矿具备有效性和适用性。结合地质认识和工程手段验证成果,总结典型矿区地质和地球物理找矿标志,建立适用于地区金矿带的地质—地球物理找矿模型,为地区深部找矿提供技术支撑。

下庄矿田花岗岩外接触带型铀矿化特征及找矿标志

外接触带型铀矿床是花岗岩型铀矿床的一种重要类型,文章通过研究下庄矿田东部地区外接触带的地质、物探特征并结合区内铀矿勘查成果,归纳总结了下庄矿田花岗岩外接触带型铀矿化特征及控矿因素,提出下庄矿田花岗岩外接触带型铀矿化严格受“岩性界面、构造、热液蚀变”三位一体控制,而花岗岩体与寒武纪地层的接触界面、强烈的构造运动、叠加发育的多种热液蚀变以及放射性异常点带是主要的找矿标志,同时文章研究认为竹园头地区具有与新桥东、坪田矿床相似的成矿地质条件和铀矿化特征,并在找矿标志集中部位通过钻探揭露获取了很好的工业铀矿化,表明竹园头地区是进一步铀矿勘查的重点区域。

地震方法在胶东地区西林断裂带深部金矿找矿预测中的应用与指示

西林断裂带与金及多金属矿化关系密切,具有较好的金矿资源潜力,查明其控矿断裂深部结构特征,是金矿勘查工作能否取得突破的关键与重点。本文在分析金矿成矿规律的基础上,通过开展反射地震方法研究,明确了胶东地区主要控矿断裂带产状变化的地震响应特征,指出:地震时间剖面上同相轴能量发生强弱变化、连续性变差部位,较大可能为断裂产状变化的指示,有良好的成矿可能。据此预测了成矿靶区并进行了验证。

粤北诸广山岩体南部长排铀矿床7号断裂带找矿潜力分析

长排铀矿床位于诸广山岩体南部的长江矿区,北临棉花坑铀矿床,区域上成矿条件优越。通过近年来的勘查工作验证,在其7号断裂带取得了较好的找矿成果,主矿体已控制资源量超千吨。为探寻7号断裂带深部是否仍具有找矿潜力,文章从断裂带性质、规模及蚀变特征等方面,与棉花坑主含矿带对比,发现两者矿化特征、控矿因素相似,且同样具有矿体往深部有变富、变大的趋势。通过综合分析7号断裂带的铀矿化特征、控矿因素、铀成矿规律及成矿模式,结合近年来在该带取得的地质、综合物化探成果以及矿体的侧伏规律等,认为7号断裂带走向、倾向,特别是0 m标高以下具有较好的找矿潜力。

元素分带及其在地质找矿中应用的几个问题

元素分带是指在矿床形成过程中,由于物理化学条件的变化,不同元素或矿物按照一定的空间顺序排列的现象。其包含多种类型,每种类型又有其特定的分布模式和控制因素。在地质找矿中,元素分带的认识不足会导致勘探目标定位不准、评价误差以及资源潜力估计不准确等问题。因此应加强对元素分带机理的研究,利用现代分析技术精细识别分带特征,并通过多学科综合研究优化勘查策略。

SOTEM技术在豫西地区银多金属矿深部找矿中的应用

在豫西地区银多金属矿深部找矿工作中,采用电性源短偏移距瞬变电磁法(SOTEM),结合地质构造和物性特征,对豫西地区的银多金属矿进行了深部探测。通过对龙门店矿区和申家窑矿区的工程实例分析,结果表明SOTEM技术能够有效探测高阻和低阻地质体,尤其是在山区大探测深度的需求下,相较于传统的AMT技术,SOTEM技术施工更简单、勘探深度更大。在龙门店矿区,SOTEM技术成功揭示了与银铅矿体相关的高阻异常体;在申家窑矿区,SOTEM技术与AMT技术相互验证,均能有效探测层间拆离破碎带,但SOTEM技术在深部探测能力上更优。

江西崇仁县下庙前金矿地质特征与找矿方向分析

本文通过野外调研、岩心编录、分析测试、综合研究等方法,系统总结了下庙前金矿区地质特征、矿体特征及矿石特征,认为区内构造以NE向逆冲推覆型韧性剪切带为主,金矿化受韧性剪切带控制,浅部金矿体产于韧性剪切带内碎裂石英脉、硅化破碎带中,深部见糜棱岩型金矿体,成矿类型属韧性剪切带型金矿。并指出韧性剪切带中深部缓倾部位、韧性剪切带与燕山期花岗斑岩耦合部位是最有价值的找矿方向,有必要开展进一步找矿验证。

东昆仑加嗡地区金铜矿地质特征及找矿方向

青海东昆仑是中国一个重要的、极富潜力的金属成矿带,而东昆仑东段是一个以金为主的成矿聚集区。加嗡地区位于东昆仑东段督冷沟以北,从异常检查到调查评价,通过近3年的地质勘查工作,该区北部已圈出6条含金构造蚀变带,6条金矿体,多条金矿化体。通过对该区地质背景、金矿体地质特征总结梳理,综合分析地层、构造、含金构造蚀变带特征,认为金矿体形态、产状、规模受北东向构造控制明显,为构造蚀变岩型金矿;南部已发现铜矿体,结合地物化资料分析研究探讨了找矿方向,为下部工作提出建议。