地震地磁监测试验区研究进展          下载免费PDF全文

张毅  顾左文  顾春雷  朱志春  王雷  徐如刚  陈斌 《地震工程学报》2009,31(4):393-396,402

主要从中国地震地磁监测试验区的现况、数据观测与处理、模型计算方法以及监测成果等方面介绍了研究进展.通过对地震地磁试验区的探索性研究,分析了开展监测试验区研究的重要意义,展望了其发展前景.  相似文献   

基于微粒变化对崇测冰帽浅层冰芯的定年结果   总被引：6，自引：1，他引：5  

韩建康  中尾正义  东久美子  张万昌  和田熏  朱丰年 《冰川冻土》2005,27(6):846-852

冰芯年代学的建立, 对于稳定同位素定年方法失效的钻点尤为困难. 依据粒径在0.66～1.33μm之间的不可溶尘埃微粒的浓度垂向分布, 并结合阳离子Ca2 的浓度剖面变化, 实现了对崇测冰帽冰芯浅层的断代. 该冰芯钻自海拔6 532 m的冰穹顶部, 解析的18.7 m冰芯长度占到钻点冰层深度约2/5, 辅助的定年参数包括钻点表层5 a的实测净积累率和大气核试验的地层标志. 综合各种技巧定年, 崇测冰帽该冰芯覆盖的记录年代为1902-1992年, 最底部累积误差在±2 a(约为2%).  相似文献   

Mineral carbon MinC(%) from Rock-Eval analysis as a reliable and cost-effective measurement of carbonate contents in shale source and reservoir rocks     

《Marine and Petroleum Geology》2017

The abundance of carbonate minerals in rocks is an important element for petroleum geochemists, geologists and engineers to consider during hydrocarbon exploration and production. Carbonate minerals can be related to the depositional environments of the source rocks and hence the type of organic matter that can be subsequently modified through diagenetic processes. The total carbonate content in shales can also be used to deduce their fracability as reservoir rock for shale gas/oil extraction. At present, mineralogical analysis by X-ray diffraction (XRD) is the most widely used technique in the oil and gas-related petrophysical and geochemical laboratories for identifying and quantifying carbonate minerals in rock samples. In contrast, the use of the total mineral carbon content parameter MinC (%) from Rock-Eval analysis has been limited despite (1) the parameter's effectiveness as demonstrated through instrument and methodology development; and (2) the presence of a large volume of Rock-Eval results due to its widespread use in the oil and gas industry.In this study, we acquired XRD and Rock-Eval analytical results on over nine hundred rock samples ranging from Ordovician to Cretaceous age from four petroleum sedimentary basins in Canada. Least-squares regression analyses produce empirical equations with R² values greater than 0.92 for the correlations between XRD total carbonate contents and the Rock-Eval MinC (%) values of six different suites of samples. This indicates that the MinC (%) values generated by Rock-Eval 6 and other instruments of similar capability can be used with confidence for estimating the amounts of total carbonates in sedimentary rock samples. While the correlation between the two types of carbonate content measurements is geology-specific, a global linear regression model (R² of 0.97) based on the large combined data set has been proposed for approximating the total carbonate abundances based on Rock-Eval MinC (%) values.  相似文献   

塔里木盆地下寒武统肖尔布拉克组白云岩储层特征及成因   总被引：2，自引：0，他引：2  

严威  郑剑锋  陈永权  黄理力  周鹏  朱永进 《海相油气地质》2017,22(4)

利用钻遇肖尔布拉克组的13口井和2条露头剖面的资料,分析了白云岩储层的宏观和微观特征,认为塔里木盆地下寒武统肖尔布拉克组主要发育9类岩性,孔隙的发育具有明显的岩相选择性,指出粉—细晶白云岩、砂屑白云岩、藻格架白云岩、泡沫绵层石白云岩、叠层石白云岩、凝块石白云岩和粘结(颗粒)白云岩是储层的主要载体。通过岩石学特征、多参数地球化学特征分析,结合地质背景,研究了肖尔布拉克组白云岩储层的成岩作用序列和孔隙演化史,明确了高能丘滩相的多孔沉积物是储层发育的物质基础,早表生期大气淡水溶蚀作用是储层形成的关键,埋藏(热液)溶蚀作用使储层得到了改善。  相似文献   

川西北部泥盆系观雾山组沉积相新认识——以大木垭剖面与何家梁剖面为例     

熊连桥  姚根顺  沈安江  陈剑  熊绍云  郝毅 《海相油气地质》2017,22(3)

川西泥盆系观雾山组沉积相研究缺乏横向对比,沉积模式还存在争议。根据川西北部白家乡大木垭剖面与何家梁剖面实测成果,对中泥盆统观雾山组沉积相进行了分析,认为:大木垭剖面与何家梁剖面观雾山组为碳酸盐镶边台地沉积,期间发生短暂的碳酸盐缓坡化;桂溪剖面观雾山组同属碳酸盐台地边缘,观雾山组中段发育开阔台地深水沉积,并不是前人认为的潟湖沉积。研究区碳酸盐镶边台地包括台地边缘和前缘斜坡两种亚相,前缘斜坡亚相发育于何家梁剖面,以塌积岩沉积为标志。碳酸盐缓坡包括深水缓坡和浅水缓坡两种亚相。随着海平面变化,观雾山组碳酸盐岩发育三个沉积旋回,第一、第三沉积旋回为镶边台地沉积,第二沉积旋回为碳酸盐缓坡沉积。观雾山组沉积微相对储层的分布起控制作用:生物碎屑滩和上斜坡微相为有利储层发育相带;生物礁中在油气运移之前形成的溶蚀孔洞已被白云石和方解石充填,滩间微相泥质(泥晶)白云岩不利于溶蚀孔洞形成,这二者均不是有利储层发育相带。  相似文献   

鄂尔多斯盆地奥陶系颗粒滩白云岩储层特征及主控因素     

吴东旭  吴兴宁  王少依  于洲  丁振纯  孙云川  杨越东 《海相油气地质》2017,22(2)

基于岩心观察、薄片鉴定、物性分析和地球化学分析,结合岩相古地理研究,认为鄂尔多斯盆地中东部奥陶系盐下发育三套颗粒滩白云岩储层,分别为下奥陶统马家沟组马二段、马四段和马五_(7+9)亚段。马二段颗粒滩环台内洼地分布,马四段和马五_(7+9)亚段颗粒滩环台内洼地以及滩间次级洼地两侧的相对隆起带分布。白云岩储集空间类型主要为粒间孔、晶间(溶)孔、溶蚀孔洞和裂缝。三维CT分析表明,白云岩储层具有优良的储渗性能。颗粒滩白云岩主要为浅埋藏蒸发海水渗透回流交代成因。白云岩储层的发育主要受控于三个因素:层序格架控制的颗粒滩分布,表生岩溶作用,构造裂缝系统。  相似文献   

Characteristics of Carbonate Reservoir and Its Forming Conditions in Continental Lake Basin of China     

Jiangmin Du  Pengyu Long  Peng Yang  Qiang Ding  Xiuyin Hu  Wei Li  Yang Bai  Jun Sheng 《地球科学进展》2020,35(1):52-69

For decades of exploration, geologists have made great achievements in the exploration of lacustrine carbonate rocks. By dissecting four typical cases of lacustrine carbonate rocks, such as Lucaogou Formation of Permian in Junggar Basin, Da'anzhai Section of Jurassic in Sichuan Basin, Cretaceous in Yin'e Basin and Oligocene in Qaidam Basin, the reservoir characteristics, hydrocarbon generating capacity and reservoir forming model of source rocks were analyzed. The results show that: \mathrm{①} Lacustrine carbonate reservoirs are generally dense, with nano-micron reservoir space as the main reservoir space, including dolomite intergranular pore, organism cavity and accumulation pore, micro-fracture system and its corrosion expansion pore. Saline environment is beneficial to dolomitization and can improve the reservoir capacity of lacustrine carbonate rocks, but most of the permeability is less than 0.1 mD. \mathrm{②} Lacustrine carbonate rocks have not only reservoir capacity, but also can be used as source rocks. The abundance of organic matter is not high and the maturity is generally low. However, dispersed soluble organic matter in source rocks can generate and expel hydrocarbons in large quantities at low maturity stage, which has high liquid hydrocarbon yield. \mathrm{③} Oil and gas reservoirs are characterized by "high initial production, large reduction of production and long-term low and stable production", and are typical "fracture-pore" reservoirs. Fracture networks provide migration pathways in the process of primary migration and accumulation of oil and gas in geological history and oil and gas exploitation nowadays. \mathrm{④} Oil and gas reservoirs are "continuous" unconventional reservoirs, which often form regional oil and gas field groups together with conventional reservoirs in adjacent areas. The research results lay a theoretical foundation for re-evaluating the exploration potential of lacustrine carbonate rocks.  相似文献   

Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic)     

Saborido-Rey  Fran; Junquera  Susana 《ICES Journal of Marine Science》1998,55(3):515-521

  相似文献   

Hazard and risk assessment for sinkhole formation on dolomite land in South Africa   总被引：1，自引：1，他引：0  

D. Buttrick  A. van Schalkwyk 《Environmental Geology》1998,36(1-2):170-178

 A method is proposed to assess the risk for sinkhole formation in dolomitic areas where changes in land use are envisaged. Data from geotechnical site investigations are used for the zoning and characterization of sites in terms of the hazard (maximum size of sinkhole that can form), while the inherent risk for this hazard to occur is assessed by assuming that the site may be developed or treated incorrectly (abused). By considering both the hazard and the inherent risk, it is possible to select appropriate types of development and precautionary measures to reduce the final (development) risk to an acceptable level. Received: 15 September 1996 · Accepted: 12 May 1998  相似文献   

液态下冰芯微粒含量随时间的变化-南极乔治王岛冰芯微粒研究(英)   总被引：1，自引：1，他引：0  

KAANG Jian-Cheng  WEN Jia-Hong  WAAANG Da-Li  LIU Lei-Bao  YAN Ming  Li Yuan-Sheng  Han Jian-Kang 《冰川冻土》1998,(4)

Re-measurement of microparticle content of surface 10 m ice core from the top of King George Island Ice Cap shows that, except samples in 8. 5～ 10 m depth, the microparticle content generally decreases 45%～ 85% within first 48 hours at melted state, afterwards, the content change is small. Content at each grain size interval has a decrease, but the main decrease is in particles of <3μm. Though particle content varies with depth, the decreases are much larger in peak areas than in valleys. From the tests, it can be considered that, the reason of particle content decrease at melted state is that some sea salt grains in samples dissolved. The microparticle content of samples in 8. 5～ 10 m depth has not decrease, the reason is that melting and re freezing have occurred at the depth, because the ice temperature is near 0 °C, and there are series of ice layers, the thickest is 7 cm, at that depth. The chemical analyses for same samples at same conditions show that, except irregular changes in NH4,NO, there are small changes in other ions, probably the content changes in micro-grain <3 μm can not obviously cause the chemical content change in samples.  相似文献