阿尔金断裂系的组成及相关中新生代含油气盆地的成因特征   总被引：1，自引：0，他引：1  

车自成  刘良  刘洪福  罗金海 《地质通报》1998,(4)

阿尔金构造带是多次俯冲—碰撞而形成的塔里木板块东南边缘,构造带内的走滑活动始于奥陶纪中晚期,中新生代强烈活动,并将北部不同构造单元的一些地质体拖曳到断裂带中,形成北山与敦煌构造楔。北山—阿拉善及断裂两侧的其他地质体受到走滑拉分作用的强烈改造,形成许多中新生代含油气盆地,共同构成我国中西部一条巨型走滑断裂系。  相似文献   

岩石圈流变性与沉积盆地以辽西-辽北-松辽盆地区为例     

许敏  薛林福  王东坡 《吉林大学学报(地球科学版)》1998,(4)

岩石圈流变性取决于岩石圈的地热状态、物质组成和结构,并量化为岩石圈总强度。沉积盆地的沉降和抬升是地球最上层流变带形变的响应,岩石圈板块对构造应力的响应在很大程度上取决于岩石圈流变性在横向和纵向上的不均一性。辽西、辽北、松辽盆地区岩石圈流变性存在明显差异,因而岩石圈总强度明显不同,在晚中生代伸展过程中,变形方式、变形幅度不同,分别形成了断陷盆地、多断少坳型盆地和断坳型盆地。  相似文献   

南秦岭镇旬盆地层序地层特征及盆地分析   总被引：4，自引：0，他引：4  

唐永忠 《陕西地质》1998,(1)

地处板岩镇断裂与安康断裂之间的镇（安）旬（阳）盆地,泥盆系一中三叠统地层发育齐全,沉积构造及生物化石丰富,岩相较清晰,层序界面保存较完整,是南秦岭陆内造山带开展层序地层与盆地分析研究较为理想的地区。本文对镇旬盆地地层、层序特征进行总结,识别厘定了十一个层序不整合界面,划分了十个不整合界限地层单位,建立了盆地岩石地层格架、层序地层格架,并对盆地的形成、发展、演化进行了初步分析,探讨了沉积作用与矿产的相互关系。  相似文献   

北秦岭二郎坪岩群与秦岭岩群间构造边界的地质特征     

李亚林 《陕西地质》1998,(2)

二郎坪岩群与秦岭岩群间的构造边界是北秦岭一条重要的地质界线,经历了多期、不同层次复杂的构造变形,经研究可进一步划分为：早期韧性逆冲推覆变形期和晚期脆韧性逆冲推覆与走滑剪切变形期两个变形阶段。早期变形与二郎坪弧后盆地构造演化密切相关,晚期变形反映了陆内造山阶段的构造特征。  相似文献   

塔里木盆地塔中地区奥陶系碳酸盐岩储层空隙研究   总被引：11，自引：0，他引：11  

孔金平  刘效曾 《矿物岩石》1998,18(3):25-33

空隙是构成碳酸盐岩储层的基本单元,空隙发育史对应了成岩演化史,且不同类型空隙的储层具有不同的分布规律。塔里木盆地塔中地区奥陶系碳酸盐岩储层的空隙可以分为６类２１种,以裂缝—孔洞型为主,礁、丘、滩相碳酸盐岩、中—细晶白云岩与古岩溶和构造岩溶的复合区为有利空隙发育带,也是风化壳型油气藏和内幕型油气藏的有利储集相带。  相似文献   

Extensional Tectonic System of Erlian Fault Basin Group and Its Deep Background   总被引：2，自引：0，他引：2  

Ren Jianye  Li Sitian 《中国地质大学学报(英文版)》1998,9(3):230-237

ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｈｉｇｈｌｙｅｘｔｅｎｄｅｄｒｅｇｉｏｎｓ（β＞１．５－２）ｓｕｃｈａｓｔｈｅＢａｓｉｎａｎｄＲａｎｇｅＰｒｏｖｉｎｃｅａｎｄｐａｓｉｖｅｍａｒｇｉｎｓ,ｅｘｔｅｎｓｉｏｎａｌｔｅｃｔｏｎｉｃｓｙｓｔｅｍｉｓｃｈａｒａｃｔ...  相似文献   

用低速带切除法提高构造图精度     

徐峰  钟本善  周熙襄  李慧群 《矿物岩石》1998,(Z1)

塔里木盆地内地表面巨厚的沙层是油气勘探的主要障碍。本文在构造解释中用切除法把地表面低速的、不稳定的沙层切除,然后通过折射波反演方法,得其厚度,从而提高了构造图的精度。  相似文献   

地幔对流及其对地壳表层拉张盆地的影响   总被引：4，自引：0，他引：4  

陆现彩  顾连兴 《地学前缘》1998,(Z1)

回顾近十年来在地幔对流方面的最新研究进展,阐述了板块俯冲后在地幔中的演化特征,以及地幔上升流即地幔柱的驱动机制和地质效应。特别介绍了地幔柱对地壳表层拉张盆地形成和充填过程的影响。进一步探讨了地幔柱活动在济阳坳陷的地质表现及其引发的火山岩浆活动、碎屑充填特征。认为盆地演化的阶段性间接反映了地幔对流的阶段性。  相似文献   

Geothermal energy prospects in Brazil: A preliminary analysis     

V. M. Hamza  S. M. Eston  R. L. C. Araujo 《Pure and Applied Geophysics》1978,117(1-2):180-195

Results of geothermal gradient measurements in 44 localities in Brazil are presented. The Precambrian shield areas are found to be characterized by relatively low temperature gradients in the range 6 to 20°C/km while younger sedimentary basins are characterized by gradients in the range 15 to 35°C/km. An inverse correlation between geothermal gradient and tectonic age has been observed. This as well as the favourable hydrological conditions suggest that the best sites for extraction of geothermal energy in Brazil are the younger sedimentary basins. The Parana Basin is found to offer at present the best site for extraction of geothermal energy in Brazil. Preliminary examination of the temperature distributions in the major aquifer (Botucatu sandstone) suggest that this aquifer contains substantial quantities of warm waters in the temperature range 40 to 90°C. The water layer in this confined aquifer is in convective motion and can be considered as a low enthalphy geothermal system. Many of the routine uses to which geothermal waters are put, such as space heating and soil warming, are not applicable in Brazil mainly because of the favourable climatic conditions. Conversion of this geothermal energy into electrical energy is also unlikely to be economical. Hence we do not consider the Parana Basin geothermal system as an independent ec9nomically exploitable energy resource. However, a few other applications are pointed out where geothermal waters can be used as a supplementary or supporting energy source in increasing the efficiency of economically viable systems utilizing hot waters.  相似文献   

Low enthalpy geothermal energy resources in Denmark     

Niels Balling  Svend Saxov 《Pure and Applied Geophysics》1978,117(1-2):205-212

The deep oil exploration drillings in Denmark have shown that especially the Danish Embayment contains low enthalpy geothermal resources associated with warm aquifers. The most promising reservoirs have been found in highly permeable Upper Triassic sand and sandstone beds, which cover at least 5000 km² at depths of 2000–3000 m and at temperatures of 60–100°C. The porosity of the main reservoir is of 15–25%, and the permeability is presumed to be approximately 1 darcy (10^–12 m²) or higher. A layer thickness of 30–60 m has been observed on a number of localities. Also the Middle Jurassic and the Lower Triassic contain reservoirs of interest. A major geothermal exploration work is planned with seismic investigations, drillings to depths of 2000–4000 m and probably establishment of pilot district heating plants.  相似文献