碎屑岩储集层中绿泥石包膜的研究现状^*          下载免费PDF全文

马鹏杰  林承焰  张世奇  董春梅  魏孟吉 《古地理学报》2017,19(1):147-159

绿泥石包膜在国内外碎屑岩储集层中常有发现,其对石英次生加大的抑制及对储集层物性的影响一直是国内外学者的研究热点。本文回顾了绿泥石包膜的研究历史,总结了其研究成果,包括微观赋存状态、形成时间和机理、控制因素、对石英次生加大的抑制和对储集层物性的影响等。结果表明:(1)储集层中绿泥石包膜主要偏富铁,具连续生长的双层结构,符合“Ostwald”熟化过程,始于早期富铁黏土包膜,早成岩期转化为平行或斜切颗粒表面的内层包膜,逐渐向外生长为垂直颗粒表面的孔隙衬里绿泥石,并可在埋藏成岩过程持续生长;(2)富含铁镁矿物的火山物质(火山岩岩屑和火山灰)及暗色矿物(黑云母和角闪石等)是形成绿泥石包膜的主要物质来源,并主要富集在三角洲入海(湖)的高能水动力相带,如三角洲前缘水下分流河道及河口坝等沉积微相中,烃类充注影响孔隙衬里绿泥石的生长形态;(3)中低温环境绿泥石包膜明显抑制石英次生加大的生长,高温环境抑制效果减弱;(4)绿泥石包膜的发育有利于粒间孔隙的保护,但易降低孔隙喉道的连通性。最后指出了绿泥石包膜在目前研究中存在的问题和今后的研究趋势。  相似文献   

Reconstruction of deep fluid chemical constituents for estimation of geothermal reservoir temperature using chemical geothermometers          下载免费PDF全文

LIU Yan-guang  LIU Bing  LU Chuan  ZHU Xi  WANG Gui-ling 《地下水科学与工程》2017,5(2):173-181

This paper elaborates the chemical constituent change principles of deep geothermal fluid during the process of upward movement. It summarizes research methods of hydrochemistry, isotope and numerical modelling technique for the physiochemical processes such as decreasing temperature, shallow groundwater infusion, and degassing. The multi-component chemical geothermometry methods including gas geochemical method are discussed. High-temperature geothermal fields in China are mostly located in the southwest with frequent new tectonic movements, especially in Tibet high-temperature geothermal areas. Therefore the paper also focuses the status of high-temperature geothermal fluid research. At last, it’s pointed out in the paper that in the future we can start from typical high-temperature geothermal zones and geothermal fields to explore optimization of the multi-component geothermometry method and use it in the reconstruction and analogue of the formation mechanism and internal relevancy of regional geothermal systems.  相似文献   

地球化学温标估算长白山地热系统热储温度     

单玄龙  蔡壮  郝国丽  邹欣彤  赵容生 《吉林大学学报(地球科学版)》2019,49(3):662-672

长白山地区地热系统的研究目前还处于初级阶段,热储温度仍然是具有争议的问题。为进一步明确其高温地热成因机理,本文对该区域的4个温泉点与2口地热井进行了离子及气体组分测定与分析,并应用地球化学温标估算了热储温度。Na-K-Mg三角图和部分矿物I_S值指示长白山地区地热水与围岩未达到水岩平衡状态,稀释作用明显,仅石英、玉髓和部分含Ca²⁺矿物达到饱和并发生沉淀。根据本文及前人的研究,研究区同时存在高温喷气孔、高_ρ(Cl^-)水和高_ρ(SO_4^2-)水,这符合White汽-液分离模式提出的地热地表显示组合,因此推断长白山地区下部流体发生汽-液分离作用(沸腾)且地热系统为双相地热系统。由于双相地热系统的存在制约了水化学温标与部分气化学温标在研究区热储温度估算中的应用,因此本文结合研究区气组分特征,选取CO_2/H_2温标作为可靠温标,估算出热储温度在234.5～284.7℃之间。将长白山天池地区地质特征与地热流体特征结合,建立了长白山地区地热成因模式。  相似文献   

右江中生代极低级变质带的变质变形过程   总被引：5，自引：1，他引：5  

索书田  祁向雷  毕先梅 《地质科技情报》1996,15(4):65-72

右江中生代三叠系槽盆相浊流沉积岩系遭受了区域强烈变形和极低级变质作用，伊利石结晶度指数为０．３３１°～０．２６５°△２θ，属于浅层或近变质带；在野外和光学显微镜观察基础上，运用Ｘ射线衍射、透射电镜及电子探针等现代测试技术，对绿泥石－白云母堆垛集合体、细粒基质层状硅酸盐矿物的化学成分及结构进行了详细研究，指出绿泥石－白云母堆垛的碎屑成因及母矿物的变质过程；强调右江中生代极低级变质带具有板内造山带的构造变形特征  相似文献   

绿色蚀变带的地球化学性质及其找矿意义探讨   总被引：15，自引：3，他引：15  

丁万烈 《铀矿地质》2003,19(5):277-282

鄂尔多斯盆地直罗组发育大规模的绿色蚀变带，目前对其地球化学性质及与铀矿化的关系在认识上存有分歧。笔经初步研究认为，绿色蚀变可能是热液还原作用的蚀变产物，它与铀矿化的关系密切，具有重要的找矿意义。  相似文献   

油气储层中自生伊利石K-Ar同位素年代学研究若干问题的初步探讨   总被引：17，自引：2，他引：17  

张有瑜  罗修泉  宋健 《现代地质》2002,16(4):403-407

对油气储层中自生伊利石K Ar体系产生影响的有关问题如砂岩岩性、伊利石 /蒙皂石间层矿物的间层比和绿泥石进行了初步试验和讨论。结果表明 :中、细砂岩的应用效果相对较好 ,粉砂岩、泥质粉砂岩则难度较大 ;I/S有序间层的应用效果相对较好 ,I/S无序间层则难度较大 ;绿泥石对自生伊利石K Ar体系测年结果的影响不明显。油气注入可能是引起伊利石成岩作用终止的原因之一。最后对各种典型年龄剖面可能的成因解释进行了简要介绍和初步探讨。  相似文献   

绿泥石族矿物热学性质的研究   总被引：1，自引：0，他引：1  

杨雅秀 《矿物学报》1992,12(1):36-44

本文提供了不同成分的三八面体和二八面体绿泥石矿物的热谱、相应化学成分及结构式,并对它们进行了热转变产物的研究。实验证明,DTA曲线特征及热转变产物主要取决于矿物的化学成分。Mg-绿泥石有640℃±和840℃±两个脱羟吸热谷和870℃±的强放热峰,其转变产物为镁橄榄石和顽火辉石;Fe-绿泥石只有一个550℃±的脱羟吸热谷,并转变为赤铁矿和铁尖晶石;Al-绿泥石有一个540℃±的脱羟吸热谷和920℃±的放热峰,转变为富铝红柱石。  相似文献   

Heat flow and the geothermal potential of Egypt     

Paul Morgan  Chandler A. Swanberg 《Pure and Applied Geophysics》1978,117(1-2):213-226

Preliminary heat flow values ranging from 42 to 175 mW m^–2 have been estimated for Egypt from numerous geothermal gradient determinations with a reasonably good geographical distribution, and a limited number of thermal conductivity determinations. For northern Egypt and the Gulf of Suez, gradients were calculated from oil well bottom hole temperature data; east of the Nile, and at three sites west of the Nile, gradients were calculated from detailed temperature logs in shallow boreholes. With one exception, the heat flow west of the Nile and in northern Egypt is estimated to be low, 40–45 mW m^–2, typical of a Precambrian Platform province. A local high, 175 mW m^–2, is probably due to local oxidational heating or water movement associated with a phosphate mineralized zone. East of the Nile, however, including the Gulf of Suez, elevated heat flow is indicated at several sites, with a high of 175 mW m^–2 measured in a Precambrian granitic gneiss approximately 2 km from the Red Sea coast. These data indicate potential for development of geothermal resources along the Red Sea and Gulf of Suez coasts. Water geochemistry data confirm the high heat flow, but do not indicate any deep hot aquifers. Microearthquake monitoring and gravity data indicate that the high heat flow is associated with the opening of the Red Sea.  相似文献   

山西娄烦变质岩中蓝晶石、十字石和红柱石的特征及形成条件     

卢保奇  王赐银 《上海国土资源》2003,14(3):56-60

通过电子探针成分分析和矿物共生组合分析,利用地质温度计估算十字石、蓝晶石和红柱石的形成温压条件,以揭示十字石、蓝晶石和红柱石的形成与本区西川河断裂区域变质作用的关系。研究结果表明:本区西川河断裂以北地区出露的十字石和蓝晶石形成条件受压力控制(P=5.5-7Kpa),变质温度为520-550℃;而西川河断裂以南地区出露的红柱石的形成条件主要受温度控制(T=570-600℃),压力小于3Kpa。西川河断裂控制了南北地区的变质条件,进而控制了特征变质矿物十字石、蓝晶石和红柱石的空间分布。  相似文献   

A Study of Illite Kiibler Indexes and Chlorite "Crystallinities" with Respect to Shear Deformation and Alterations, Jinshan Gold Deposit, East China     

Xiao-feng Li    Ren-min Hua  Jing-wen Mao    Jun-feng Ji  Chun-zeng Wang 《Resource Geology》2003,53(4):283-293

Abstract. This paper presents a measurement and study of Kübler Indexes (KI) of illite, "crystallinities" of chlorite (ChC), and apparent mean crystallite sizes and lattice strain of both illite and chlorite of the Jinshan ductile shear zone in the Jinshan gold deposit of East China. It is found that the KI values and apparent mean crystallite sizes of illite decrease and the lattice strain of chlorite apparently increase, whereas the apparent mean crystallite sizes of chlorite and the lattice strain of illite remain constant, from altered mylonite to altered and higher-strained ultramylonite in the shear zone. Only slight decrease of ChC is observed.
An obvious negative correlation exists between KI and apparent mean crystallite sizes in altered mylonite with lower strain, whereas a positive correlation is found between ChC and apparent mean crystallite sizes in altered ultramylonite with higher strain. No any correlations between KI and lattice strain exist, whereas a negative correlation and a positive correlation between ChC and lattice strain occur separately in the altered mylonite and ultramylonite. It is suggested that illite Kiibler Indexes and chlorite "crystallinities" most likely reflect deformation behaviors and mechanisms of altered rocks although other factors involving water/rock ratio may apply as well.  相似文献