Discussion on research advances and hot issues in diagenesis of clastic-rock reservoirs          下载免费PDF全文

Luo Jing-Lan  Li Chi  Lei Chuan  Cao Jiang-Jun  Song Kun-Peng 《古地理学报》2021,22(6):1021-1040

The research on diagenesis of clastic-rock reservoir is developing rapidly in recent ten years. Thus, it is of great significance in academic and scientific exploration to summarize the domestic and international research progress and the key issues of frontier research on diagenesis. The research progress, main achievement and recognition in diagenesis of clastic-rock reservoirs in recent years is discussed, and the hot issues or developing trend of diagenesis in the future is probed in this paper, on the basis of summarizing the previous research results and understanding, combined with the typical research examples at home and abroad. It is believed that great progress was obtained in provenance and parent rock constraints on sandstone types and their diagenetic evolution pathways, impact of fluid-rock interaction and its product on diagenesis, influence of thermodynamics and overpressure background on diagenesis and pore development, the timing sequence between hydrocarbon accumulation and filling process and the sandstone reservoir becoming low permeability-densification. At present, diagenetic research is developing in direction of the spatial and temporal dynamics and quantitative evolution mechanistic and diagenetic system controlled by the basin fluid dynamics, thermal dynamic processes, combining the micro-scale diagenesis research with the basin macroscopic background such as sedimentation from the source to the basin, burial history, hydrocarbon maturity and charge into reservoirs, tectonic evolution and fluid activity, and fluid and rock interaction.The aim of this paper is to induce the academic peers and experts in diagenesis and the related research fields to come forward with their valuable contributions, to cooperate and work together and joint efforts on the research exquisite, profundity and breadth of diagenesis, and application of the most advanced analytical measurement techniques and methods, as well as integration and infiltration of multidisciplinary, in order to promote the course of the clastic-rock reservoir diagenetic research in China.  相似文献   

确定砂土动剪切模量和阻尼比的方法对比     

宋东松  冯震  金红山  孙逸涵 《吉林大学学报(地球科学版)》2021,51(5):1366-1380

确定土体动剪切模量的常用方法有规范法、Kumar法和自相关函数法,确定相应阻尼比的方法有规范法、Das and Luo法、Kokusho法、Kumar法和互相关函数法,为了分析不同方法所产生差异,实现定量化对比分析,笔者以福建标准砂（粒径为0.5~1.0 mm）为研究对象,采用不排水的应力控制动三轴试验,探讨不同的确定土体动剪切模量和阻尼比方法的差异性,并给出了不同土体条件建议选用的方法。结果表明：1）3种方法确定动剪切模量的结果有一定的差异,随剪应变的增大结果的差异逐渐增大,有效围压对结果的差异性有所影响,当剪应变为4×10^-3,有效围压为100 kPa时,3种方法差异显著,相对误差最大接近20%;2）而5种方法确定阻尼比的结果差异显著,随着剪应变的增大,5种方法确定的阻尼比相对误差大体上均在迅速减小,只有规范法在有效围压为100 kPa时,其相对误差有较小的增大趋势;5种方法中,Kumar法确定的阻尼比最接近平均阻尼比,互相关函数法远高于平均阻尼比,Das and Luo法和Kokusho法确定的阻尼比基本一致但低于平均阻尼比。建议以后的工程应用中,加载方式为应力控制时,可采用自相关函数法确定动剪切模量,采用Kumar法确定阻尼比,二者确定的动剪切模量和阻尼比均最接近平均值。  相似文献   

银额盆地石板泉西石炭系白山组碳酸盐岩地球化学特征及其环境意义     

史冀忠  牛亚卓  许伟  宋博  王宝文 《吉林大学学报(地球科学版)》2021,51(3):680-693

对银额盆地石板泉西石炭系白山组碳酸盐岩进行详细的地球化学分析,探讨各特征元素对古环境、古气候的指示意义。地球化学测试结果显示：除样品CH3外,其余样品主量元素中的Al及微量元素中的Ti、Zr、Th等典型陆源特征元素的含量较低,Y/Ho平均值为45.58,反映研究区白山组碳酸盐岩较少受陆源物质输入的影响;δCe与δEu、w（ΣREE）、（La/Sm）_N未见良好的相关性,也不具备Eu正异常,说明研究区白山组碳酸盐岩受成岩作用和热液作用的影响也较为有限。碳酸盐岩中所含微量元素主要为海水自生成因,能够反映原始沉积环境。根据特征元素对古水深、古盐度、古气候、古氧相和古水温进行研究,显示研究区白山组碳酸盐岩段虽然岩性较为单一,但其地球化学特征可以反映早晚的沉积古环境差异。研究区白山组碳酸盐岩总体经历了1个大的海侵海退旋回,沉积于正常海水,气候潮湿,弱氧化—弱还原环境,古水温为8.51~27.10℃,早期水温低,晚期水温升高。  相似文献   

Accelerating consolidation of soft ground by aerosol injection technique: a field study     

Wu  Hui-ming  Ma  Ning  Ma  Quan-kun  Lin  Xiao-fei  Song  Ci 《Acta Geotechnica》2021,16(9):2997-3004

We present an aerosol injection technique (AIT) to accelerate the consolidation of soft soils for ground improvement. We employ high-pressure aerosol injections at different depths to enhance the drainage in soft soils for faster consolidation. The technique is briefly described. A well-instrumented field test is carried out to demonstrate its performance. Compared to the traditional methods, our approach gives rise to faster dissipation of excess pore pressure and larger ground settlement. This method is particularly attractive for the improvement in soft ground in medium depths.

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Geological characteristics and ore genesis of Houfangzi graphite deposit in Northwestern Hebei Province     

ZHANG Xingkang  FAN Yupeng  JIN Song  JIA Zhenghai 《中国地质调查》2021,7(6):20-26

Houfangzi graphite deposit is located in the middle of the graphite metallogenic belt in the northern margin of North China Block in Hebei Province, which belongs to regional metamorphic type graphite deposit. In this paper, through rock-mineral determination, IP ladder sections and exploratory trench survey, the authors have discussed its metallogenic geological characteristics and ore body characteristics, and analyzed its ore genesis. The research results show that the ore bodies are mainly in the graphitic marble of Dongjingzi Formation of Hongqiyingzi Group, which are stratified and controlled by layers, with NE trend and NNW inclination. The IP anomaly shows that Houfangzi graphite deposit is characterized by low resistance and high polarization. Ore bodies are stable and of big scale, and their fixed carbon content ranges from 1.42% to 3.28%, which has the potential to be a large graphite deposit. The ore-forming material came from granulite and graphite marble, while the regional metamorphism is the main mineralization of Houfangzi graphite deposit, with the enrichment and increasement caused by late magmatic activity and migmatization.  相似文献   

Turnover Frequency in Solar Microwave Bursts with an Extremely Flat Optically Thin Spectrum     

Q. W. Song  H. Nakajima  G. L. Huang  B. L. Tan  Y. Huang  Z. Wu 《Solar physics》2016,291(12):3619-3635

Four microwave bursts have been selected from the Nobeyama Radio Polarimeter (NoRP) observations with an extremely flat spectrum in the optically thin part and a very hard spectral index between 0 and ?1 in the maximum phase of all bursts. It is found that the time evolution of the turnover frequency is inversely proportional to the time profiles of the radio flux in all bursts. Based on the nonthermal gyrosynchrotron theory of Ramaty (Astrophys. J. 158, 753, 1969), the local magnetic field strength and the electron spectral index are calculated uniquely from the observed radio spectral index and the turnover frequency. We found that the electron energy spectrum is very hard (spectral index 1?–?2), and the time variation of the magnetic field strength is also inversely proportional to the radio flux as a function of time in all bursts. Hence, the time evolution of the turnover frequency can be explained directly by its dependence on the local magnetic field strength. The high turnover frequency (several tens of GHz) is mainly caused by a strong magnetic field of up to several hundred gauss, and probably by the Razin effect under a high plasma density over \(10^{10}~\mbox{cm}^{-3}\) in the maximum phase of these bursts. Therefore, the extremely flat microwave spectrum can be well understood by the observed high turnover frequency and the calculated hard electron spectral index.  相似文献   

胶东半岛不同构造单元深部热流分流聚热模式     

史猛  康凤新  张杰  高松  于晓静 《地质学报》2021,95(5):1594-1605

中生代、新生代时期地壳剧烈运动将胶东半岛划分为胶北隆起、胶莱凹陷、胶南-威海隆起三大构造单元,其中隆起山地区广泛分布花岗岩、变质岩,凹陷盆地区主要分布砂岩沉积地层,胶北隆起区与威海隆起区相对于胶莱凹陷盆地区具有更高的大地热流值.为系统分析胶东半岛大地热流值分布特征及其形成机理,本文在分析胶东半岛构造-热发展史、地热地质背景、地温场分布、岩石热导率、钻孔岩性与测温数据、地热流体化学成分等基础上,发现胶东半岛地热资源均为断裂构造控制类型的中低温对流型,其热源主要为三元聚热:导热断裂带水热对流、大地热流传导、地下水运移传导-对流;构造分布、岩石热物性、地热热储分布、地下水活动等是影响地温场分布的主要因素.针对胶东半岛地温场特征及其控制因素,提出了适合该地区的隆起-凹陷分流聚热模式与概念模型,即隆起山地区岩性以导热率、渗透率相对较高的侵入岩、变质岩为主,凹陷盆地区岩性以导热率、渗透率相对较低的砂岩为主,低导热率、低渗透率的凹陷区底部更像是一个相对隔热、隔水的顶板,使得来自地壳深部的大地热流及携带热量的流体、气体等在上涌的过程中在凹陷区的底部发生折射与再分配,从而导致热流在隆起山地区的底部形成一个温度相对更高的聚热区,反映在地表即是隆起山地区相对凹陷盆地区具有更高的大地热流值,特别隆起山地区轴部位置为热流值最高的区域,高热流值区域分布形态呈NE、NNE向分布,基本与胶东半岛NE、NNE向的深大断裂走向一致,该模式的提出可以更好地为胶东地区的地热资源勘探提供指导方向.  相似文献   

Identification of the Main Control Factors and Failure Modes for the Failure of Baiyuzui Landslide Control Project   总被引：1，自引：0，他引：1  

Du  Yi  Yan  Echuan  Gao  Xu  Mwizerwa  Schadrack  Yuan  Liwei  Zhao  Song 《Geotechnical and Geological Engineering》2021,39(5):3499-3516

Geotechnical and Geological Engineering - The failure of landslide control project presents a deformation that continues to develop along the crack system, and the continuous failure of mechanical...  相似文献   

印度尼西亚Cikotok矿区帕瑟埃拉金矿成因及成矿潜力     

张顺洋  王海滨  王淞  王忠凯 《地质与资源》2021,30(2):136-142

印度尼西亚Cikotok矿区帕瑟埃拉金矿位于巽他-班达岛弧的中部Bayah穹隆中,宏观上具有找到大型矿床的地质前提.成矿围岩为始新世末-中新世早期的安山岩,围岩蚀变强烈,分带性明显,金矿脉具有多条近平行产出特征.矿床有4个成矿阶段：石英-蒙脱石-绿泥石阶段,石英-绢云母-黄铁矿阶段,石英-冰长石-硫化物-含锰矿物阶段,块状石英阶段.矿床成因类型为大洋岛弧型低硫浅成低温热液型,细分类型为"Pongkor型"条带状低硫含金石英锰氧化物矿脉型金矿,其浅表部为热泉型金矿.矿床的深部找矿潜力大,具有大型金矿的成矿潜力.  相似文献   

山东省广饶县地下水位多年动态及其地质环境效应分析     

刘帅  刘志涛  段晓飞  冯颖  蒋书杰  黄松 《中国地质调查》2021,8(3):49-57

山东省广饶县地下淡水资源丰富,是本区工农业生产和生活用水的重要水源,长期大量开采地下水引发了地下水降落漏斗、咸水入侵、地面沉降等地质环境问题。通过对广饶县地下水多年监测资料的整理和分析,揭示了本区地下水水位的变化规律,预测了地下水水位的变化趋势。分析表明: 在现状开采条件下,浅层地下水降落漏斗已基本稳定,无加重趋势。考虑地面沉降和咸水入侵的发展趋势,提出深层地下水的约束埋深不应大于80 m,甄庙地区咸水入侵临界水位为10 m,这为当地地下水的合理开采与环境地质问题的防治提供了依据。  相似文献