煤炭地下气化区高密度三维地震勘探技术研究     

张兴平  王秀荣 《中国煤炭地质》2010,(8):1-4

地下煤层气化的燃烧范围,气化燃烧热力影响边界、形态、方向,气化区冒落带的发展高度及气化煤层裂隙发育程度,是开展煤炭地下气化工程迫切需要解决的问题。基于煤炭地下气化工程试验区地震地质情况,从地震响应入手,在分析煤炭地下气化后地震波场响应特征的基础上,提出了运用高密度三维地震采集技术结合全三维地震属性解释技术,高精度识别煤炭地下气化燃烧范围、气化热力影响边界的方法。实际勘探成果表明,本方法地震成像清晰,预测精度高,与钻探结果吻合较好。  相似文献   

复杂条件下煤田三维地震勘探应用实例     

尹俊清  张玉军 《中国煤炭地质》2010,(8):35-38

勘探区地处毛乌素沙漠西南边缘,表层多为干燥疏松的沙丘和黄土;浅层为沙土、卵石、砾石层,大部分地段不含水,均为松散沉积物。区内断层和褶皱发育,煤层埋藏深度与产状变化较大。针对该区表、浅层和深层复杂的地震地质条件,通过不断优化三维地震勘探设计,最终确定了野外数据采集观测系统及激发与接收参数,并在数据处理中,选择了合适的处理技术、处理参数及处理流程,获得了信噪比与分辨率较高的三维数据体,较好的完成了地质勘探任务。  相似文献   

利用地震相分析方法圈定煤层变焦区     

王远  崔若飞  秦轲 《中国煤炭地质》2010,(12):54-57

三维地震数据体中,地震波形的总体变化源于地质体构造、岩性的综合反映,因此地震波形的总体变化是一个很重要的地震属性。然而,传统的岩性解释手段(例如波阻抗反演和地震属性技术等)忽略了地震波形的整体变化及其分布规律。利用地震波形的变化来建立地震相,在一定程度上能够弥补这一缺陷。利用地震波形划分地震相就是通过神经网络分析将地震信号按照波形进行分类,不同的类反映不同的岩性地质体。基于波形划分地震相原理,介绍了利用Stratimagic地震地层解释系统进行地震相划分的一般流程和关键参数的设置,并以淄博矿业集团葛亭煤矿某采区为例,对其3煤层变焦区进行了圈定。  相似文献   

地下煤层自燃区地震勘探研究     

王建文  孙秀容  王宏科  夏学礼  崔若飞 《上海国土资源》2010,31(4):73-75

本文旨在探索黄土塬地下煤层自燃区地震勘探技术。研究表明,火烧区在折射层析成像速度剖面、散射波地震记录、共偏移距地震剖面、地震反射波时间剖面中均有表征显示,而有别于采空区的波场特征。  相似文献   

Semisupervised heterogeneous ensemble for ship target discrimination in synthetic aperture radar images     

Yongxu Li  Xudong Lai  Mingwei Wang 《海洋学报(英文版)》2022,41(7):180-192

Ship detection using synthetic aperture radar (SAR) plays an important role in marine applications. The existing methods are capable of quickly obtaining many candidate targets, but numerous non-ship objects may be wrongly detected in complex backgrounds. These non-ship false alarms can be excluded by training discriminators, and the desired accuracy is obtained with enough verified samples. However, the reliable verification of targets in large-scene SAR images still inevitably requires manual interpretation, which is difficult and time consuming. To address this issue, a semisupervised heterogeneous ensemble ship target discrimination method based on a tri-training scheme is proposed to take advantage of the plentiful candidate targets. Specifically, various features commonly used in SAR image target discrimination are extracted, and several acknowledged classification models and their classic variants are investigated. Multiple discriminators are constructed by dividing these features into different groups and pairing them with each model. Then, the performance of all the discriminators is tested, and better discriminators are selected for implementing the semisupervised training process. These strategies enhance the diversity and reliability of the discriminators, and their heterogeneous ensemble makes more correct judgments on candidate targets, which facilitates further positive training. Experimental results demonstrate that the proposed method outperforms traditional tri-training.  相似文献   

闽江口外海域MIS 5和MIS 3的地震地层学特征和古环境          下载免费PDF全文

刘阿成  张杰  唐建忠 《应用海洋学学报》2022,41(1):109-118

通过闽江口外海域进行的高分辨率浅地震剖面(拖筏)调查,揭示了MIS 6末期以来最大厚度约90 m的沉积地层。研究了MIS 5和MIS 3地震层序的反射波结构特征,基于地震相分析识别沉积地貌类型;结合深海氧同位素海平面变化曲线,阐述了两时期研究区的沉积环境、特殊地貌的分布和体系域阶段;最后简要探讨了海侵视强度(视高度)及其影响因素。在MIS 5,研究区主要为滨浅海环境,在MIS 5.3和MIS 5.1局部发育了赛江水下三角洲、潮流沙脊和滨海沙坝等沉积地貌;在初期和低海面亚期为陆相环境,发育了闽江和赛江河道,分别经南部和东北部向东入海(台湾海峡)。在MIS 3,研究区普遍为海水覆盖,以滨浅海环境为主,局部发育闽江水下三角洲叶瓣和潮流沙脊。MIS 5的海平面远高于MIS 3,但是典型地震剖面的研究表明,前者的海侵视强度(视高度)低于后者,推断这一现象主要与构造沉降有关,沉积物压缩也有一定的影响,这也可以解释南部海区MIS 5.2的古闽江河道要远低于当时海平面的现象。  相似文献   

Rift kinematics preserved in deep-time erosional landscape below the northern North Sea     

Thilo Wrona  Alexander C. Whittaker  Rebecca E. Bell  Robert L. Gawthorpe  Haakon Fossen  Christopher A.-L. Jackson  Marit Stokke Bauck 《Basin Research》2023,35(2):744-761

Our understanding of continental rifting is, in large parts, derived from the stratigraphic record. This record is, however, incomplete as it does not often capture the geomorphic and erosional signal of rifting. New 3D seismic reflection data reveal a Late Permian-Early Triassic landscape incised into the pre-rift basement of the northern North Sea. This landscape, which covers at least 542 km², preserves a drainage system bound by two major tectonic faults. A quantitative geomorphic analysis of the drainage system reveals 68 catchments, with channel steepness and knickpoint analysis of catchment-hosted palaeo-rivers showing that the landscape preserved a >2 Myr long period of transient tectonics. We interpret that this landscape records a punctuated uplift of the footwall of a major rift-related normal fault (Vette Fault) at the onset of rifting. The landscape was preserved by a combination of relatively rapid subsidence in the hangingwall of a younger fault (Øygarden Fault) and burial by post-incision sediments. As such, we show how and why erosional landscapes are preserved in the stratigraphic record, and how they can help us understand the tectono-stratigraphic evolution of ancient continental rifts.  相似文献   

松辽盆地深层断陷沙河子组烃源岩分布预测与生气潜力   总被引：1，自引：0，他引：1  

王志宏  李剑  夏利 《世界地质(英文版)》2014,(3)

松辽盆地下白垩统沙河子组是深层断陷的主要烃源岩发育层系,目前钻井揭示其厚度大（＞700 m）,埋藏深（＞3500 m）,但钻井大都分布于深层断陷的边部,断陷内部烃源岩层揭示少。根据断陷结构样式及地震反射特征,总结出单断箕状断陷和双断地堑式断陷两种沙河子组烃源岩发育模式,并确定深层烃源岩主要有五种存在形式。断陷中部席状平行结构、成层性、连续性好的地震反射特征的烃源岩最为落实,主要为深湖-半深湖相,暗色泥岩厚度大,暗地比高（45％～70％）。深层沙河子组烃源岩总生气量约148.38×1012 m3,天然气资源潜力巨大。  相似文献   

Protracted Active Surge Phase in the High Arctic (Svalbard): Dynamic Development and Morphological Impact     

Ida Lønne 《Geografiska Annaler: Series A, Physical Geography》2014,96(2):177-194

Glacial surges in Svalbard are protracted and characterized by individual dynamic evolution, in contrast to many other areas, which calls for a subdivision of the classic two‐phased surge cycle. A dominating part of the ice masses seem to have a surge potential and this represents a considerable challenge for palaeoclimatic studies. Glaciological and geological models therefore need to be coupled. The issue is discussed with Fridtjovbreen glacier as an example. This ice mass is one of few glaciers studied throughout a surge cycle. It was active for 12 years (1991–2002) and represents the most protracted surge documented. The maximum advance rate was 4.2 m day^?1, its maximum extent was reached after seven years, its run‐out distance was 4 km, and the relocated ice filled 5 km² of the fjord. Intense subglacial thrusting occurred during various stages, including part of the ice‐front retreat, as shown by sub‐bottom profiling data from 2002. A six‐stage model is presented and processes are discussed with emphasis on the ice‐front retreat with transition to the quiescent phase. Although the surge mechanism itself is unrelated to climate, climatic conditions obviously play a major role in the course of a surge. During the surge, the ice mass made a dramatic impression in the landscape, but 10 years after the maximum extent, there is little onshore evidence of the event.  相似文献   

利用生产动态及地震资料分析井间河流相砂体连通性     

王海更  汪利兵  刘洪杰  刘建华  刘卫林  申春生 《海洋地质译丛》2014,(3):66-71

渤海PL油田是位于渤海湾盆地的大型河流相油田,在其注水开发过程中,亟需准确认识注水井与生产井之间的砂体连通性,以便优化和调整注采井网,提高采收率.针对油田砂体横向变化快,纵向上薄砂体发育的特点,利用丰富的压力、水淹等生产动态资料及相位转换后赋予地质意义的地震资料综合分析砂体的连通性,进一步完善和修正了早期以地质及测井资料确定的砂体连通性分析成果,并引入注采连通率概念,用来定量表示井组范围内注水井与生产井之间的砂体的连通性.该套方法在PL油田注水优化及井网调整研究中得到了充分的体现,对其它河流相注水开发油田井组范围内井间砂体连通性研究具有一定的借鉴作用.  相似文献