Preliminary assessment of the geothermal potential of Rosario de la Frontera area (Salta,NW Argentina): Insight from hydro-geological,hydro-geochemical and structural investigations     

《Journal of South American Earth Sciences》2014

This work is part of a project aimed to the development and application of hydrogeological, hydrogeochemical and geological methodologies for the study of the geothermal system of Rosario de La Frontera (NW Argentina).The surface thermal manifestations of this area, whose temperatures range from 22.6 to 92.6 °C, are mainly located in the northern sector of Sierra de la Candelaria anticline. This regional structure crops out between the provinces of Salta and Tucuman (NW Argentina), at the foothills of the central Andean retro-wedge.The present investigation focuses on hydrogeological and structural data, and isotopic compositions (¹⁸O, D and ³H) of thermal springs.Preliminary results allowed to define: i) the meteoric origin of spring water and their long (more than 50 years) residence time at depth, ii) a positive water balance, ranging between 2 and 4 millions of m³/yr, and iii) a conservative geothermal reservoir volume of about 39 km³, iv) a geothermal potential with Er = 5.6*10¹⁸ J and Ef = 0.8*10¹⁸ J.  相似文献   

土库曼斯坦阿姆河盆地卡洛夫-牛津阶储层特征及控制因素分析   总被引：1，自引：0，他引：1  

郑荣才  陈浩如  王强  崔璀  费怀义  徐文礼 《岩石学报》2014,30(3):779-788

土库曼斯坦东北部的阿姆河盆地,是中亚地区最重要的含油气盆地之一。根据钻井岩芯和分析化验资料,确定阿姆河盆地卡洛夫-牛津阶为碳酸盐台地相沉积,具有特征的前缘缓斜坡沉积模式,可划分为蒸发台地、局限台地、开阔台地、台地边缘、前缘缓斜坡和盆地6个相带。其中台内、台地边缘和前缘缓斜坡为储层发育相带,尤以发育于台地边缘、开阔台地和前缘缓斜坡相带中的礁、滩微相最有利于储层发育。沉积微相和岩性对储层类型及物性有直接控制,特点为高能环境条件下沉积的块状礁灰岩和中-厚层状滩相颗粒灰岩以发育原生孔隙保存良好的孔隙型和裂缝-孔隙型储层为主,而较低能环境条件下沉积的(含)颗粒微晶灰岩、隐藻灰岩和泥-微晶灰岩以发育基质岩物性很差的裂缝型储层为主。通过综合分析,认为储层发育受沉积微相、岩性和成岩作用复合控制,以各相带内的礁、滩微相灰岩为高效勘探开发目标的"甜心"位置。  相似文献   

飞来峡水利枢纽库区动态纳污能力计算研究   总被引：1，自引：0，他引：1       下载免费PDF全文

谭超  黄本胜  洪昌红  邱静  胡培 《水文》2014,34(5):51-56

根据飞来峡水利枢纽库区水流及水质特点,选取不同设计流量,建立二维水流水质模型。通过水槽实验,拟合水质衰减系数与流速的关系曲线,以获取模型水质计算参数。研究结果表明:通过概化排污口排污量与混合带长度响应关系计算,确定各排污口混合带长度在1 300~2 500m之间;在90%最枯月、50%最枯月及多年平均流量水文条件下,飞来峡库区干流水域COD纳污能力分别为162 107.7t、199 220.2t及372 104.3t;NH3-N纳污能力分别为2 757.4t、3 408.4t和6 276.4t;飞来峡库湾的纳污能力远小于库区干流水域,库湾COD纳污能力仅相当于干流的25%,NH3-N纳污能力仅相当于干流的5%;飞来峡库区纳污能力年内逐月差异显著,其中汛期(4~9月)纳污能力较大,COD、NH3-N纳污能力约占全年纳污能力的58%,飞来峡库区年内月纳污能力与月平均流量呈现较好的正相关关系。  相似文献   

Effects of different operational modes on the flood‐induced turbidity current of a canyon‐shaped reservoir: case study on Liuxihe Reservoir,South China     

Sheng Wang  Xin Qian  Bo‐Ping Han  Lian‐Cong Luo  Rui Ye  Wen Xiong 《水文研究》2013,27(26):4004-4016

Suspended matter is an important indicator of water quality in freshwater systems. The flood‐induced turbidity current plays a dominant role in the seasonal dynamic of suspended matter in the Liuxihe Reservoir (23°45′50″N; 113°46′52″E), a large, stratified reservoir at the Tropic of Cancer in southern China. Field measurements show that loading and distribution of suspended matter in the reservoir differ in typical wet, dry and medium years, as a result of different discharge volumes and water level variation patterns. Using historical data and the practical demand for water supply and flood control, we generalized two feasible reservoir operational modes: flood impounding mode (drawing down the reservoir to a low level before flood events to impound inflow during the flooding season) and moderate level change mode (drawing down the reservoir to a moderate level before flood events, then keeping the level within the flood control level during runoff events). To examine the effects of different operational modes and outlet depths on the reservoir's flood‐induced turbidity current, a numerical simulation model was applied in three types of hydrological conditions. The results show that the mode with moderate drawdown and recharge processes can decrease loading of suspended matter in spring and promote turbidity current release during flood events, and upper withdrawal can improve the effects of turbid water release. We suggest that more attention should be focused on water quality management in the reservoir operation stage, severe artificial water level fluctuation being avoided and selective withdrawal becoming an optional management measure. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

塔中1井储层段岩石学特征及成岩作用     

翟永红  王泽中  王正允  王方平 《地球科学与环境学报》1994,(3)

本文对塔中１井储层段进行了岩芯、薄片、阴极发光等观察和分析，划分出了角砾白云岩、残余颗粒白云岩和晶粒白云岩３种岩石类型，识别出了白云石化、硅化、方解石化、重晶石化、萤石化、黄铁矿化、自生粘土矿物化以及溶解、压溶等成岩作用类型；归纳出塔中１井储层段经历了３个成岩阶段、４种成岩环境的改造和叠加，并在物性测定的基础上给出３个岩性段的储集条件．  相似文献   

The added value of joint PP–PS inversion for reservoir characterization: A case study using Jubarte PRM seismic data (offshore Brazil)     

Andrea Damasceno  Ali Tura  James Simmons 《Geophysical Prospecting》2022,70(1):121-134

The added value of the joint pre-stack inversion of PP (incident P-wave and reflected P-wave) and PS (incident P-wave and reflected S-wave) seismic data for the time-lapse application is shown. We focus on the application of this technique to the time-lapse (four-dimensional) multicomponent Jubarte field permanent reservoir monitoring seismic data. The joint inversion results are less sensitive to noise in the input data and show a better match with the rock physics models calibrated for the field. Further, joint inversion improves S-impedance estimates and provides a more robust quantitative interpretation, allowing enhanced differentiation between pore pressure and fluid saturation changes, which will be extremely useful for reservoir management. Small changes in reservoir properties are expected in the short time between the time-lapse seismic acquisitions used in the Jubarte project (only 1 year apart). The attempt to recover subtle fourth-dimensional effects via elastic inversion is recurrent in reservoir characterization projects, either due to the small sensitivity of the reservoirs to fluid and pressure changes or the short interval between the acquisitions. Therefore, looking for methodologies that minimize the uncertainty of fourth-dimensional inversion outputs is of fundamental importance. Here, we also show the differences between PP only and joint PP–PS inversion workflows and parameterizations that can be applied in other projects. We show the impact of using multicomponent data as input for elastic seismic inversions in the analysis of the time-lapse differences of the elastic properties. The larger investment in the acquisition and processing of multicomponent seismic data is shown to be justified by the improved results from the fourth-dimensional joint inversion.  相似文献   

鄂尔多斯盆地子洲气田上古生界山西组、下石盒子组储集层特征对比研究   总被引：2，自引：0，他引：2       下载免费PDF全文

王若谷  李文厚  廖友运  冯永玖  郭艳琴  马瑶  许星 《地质科学》2015,50(1):249-261

鄂尔多斯盆地子洲气田山西组山2~3段和下石盒子组盒8段是该区天然气的主力储集层,但其产能却存在很大差异。应用薄片鉴定、扫描电镜、高压压汞、恒速压汞及岩心分析资料,分别对该地区上古生界山西组山2~3段和下石盒子组盒8段储集层进行了研究。子洲气田山2~3储层以石英砂岩为主,孔隙类型多样,粒间孔、溶孔、晶间孔发育,喉道类别以微—细喉为主,属相对低孔高渗型储层;盒8储层则以岩屑砂岩为主,孔隙类型主要为岩屑溶孔和晶间孔,喉道类别以细—微喉为主,属于相对低孔低渗型储层。山2~3段和盒8段储集层岩石类型、孔隙结构差别巨大,造成了其储集性能的差异性。不同的沉积环境和成岩作用是造成其差异性的主要原因。  相似文献   

三峡水库运行初期的泥沙淤积特点   总被引：3，自引：0，他引：3       下载免费PDF全文

李文杰  杨胜发  付旭辉  肖毅 《水科学进展》2015,26(5):676-685

针对三峡蓄水运行后的泥沙淤积问题,基于实测资料,采用输沙率法和断面法分析了三峡水库运行初期的泥沙淤积特点.结果表明:三峡水库2003—2013年泥沙淤积总量为15.31亿t,平均排沙比为24.5%,均较论证阶段降低;库区泥沙淤积主要分布在常年回水区的宽谷和弯道河段,宽谷段全断面发生淤积、弯道断面流速较小一侧淤积、峡谷无累积性淤积;常年库区近坝段泥沙淤积速度逐年减小,而上段泥沙淤积速度则呈增大趋势;淤积物粒径沿程分选不明显,常年回水区淤积物中值粒径多在0.01 mm以下.库区峡谷段深泓线无明显变化、尚未出现泥沙淤积三角洲、库尾泥沙淤积上延和尾水抬高不明显,据此初步推断峡谷河段存在富余挟沙力而成为局部侵蚀基准面,整个库区将无统一平衡比降的趋势.  相似文献   

白云石化作用及白云岩储层研究进展   总被引：1，自引：0，他引：1  

黄擎宇  刘伟  张艳秋  石书缘  王坤 《地球科学进展》2015,30(5):539-551

白云石化作用和白云岩储层一直都是碳酸盐岩研究中的重要领域。近年来,随着实验分析技术的进步以及油气勘探的深入,对白云岩的研究也取得了诸多进展:1数值模拟技术逐步应用到白云岩研究中,实现了白云石化模式研究由定性到定量的转变;2对微生物白云石化的研究不断加强,识别出了微生物相关白云石的特殊显微形貌特征并对其生物矿化机制进行了分析;3对已有白云石化模式的重新审视:包括对混合水白云石化的修正、对回流白云石化的扩展以及对构造—热液白云石化模式的丰富;4在白云石化与孔隙相关关系的研究中,突破了白云石化增孔的传统认识,逐步强调白云石化在孔隙保存方面的作用;5注重研究白云岩结构、成岩环境、原始相带以及白云岩形成之后的溶蚀改造等因素对白云岩储层发育的控制作用。在未来的研究中,应加强3个方面内容,一是对白云岩结构演化规律的定量研究,二是在成岩流体示踪方面要加强对新技术手段(如二元同位素、Mg同位素)的使用,同时注意借鉴成矿流体研究中的成熟技术和方法,三是要加强对深部白云岩储层形成和保存机制的探索。  相似文献   

庆阳-合水地区长8油层组沉积物源分析     

杨梦辉  刘广锋  童明均  杨伟伟 《地下水》2015,(2)

物源分析对砂岩储层的展布与分析预测具有重要的意义。通过对鄂尔多斯盆地西南缘庆阳-合水地区上三叠统延长组长8油层组的砂岩重矿物组合、轻矿物组合及砂岩岩屑组分的平面分布特征分析,判断了庆阳-合水地区的沉积物源方向。研究表明,庆阳-合水地区存在两大物源和古流沉积体系,即西南方向的庆阳沉积古流体系和南部方向的合水沉积古流体系;长82亚组沉积期以南部的沉积古流体系为主,而长81亚组沉积期以西南部的沉积古流体系为主;重矿物组合特征分析显示长81亚组沉积期合水区带混源现象明显。  相似文献