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1.
On the basis of the shape and inner structure of volcanic edifice,the dip angle and coherence were selected to recognize the buried volcanic edifices in Songliao Basin.Five volcanic edifices were recognized in both two methods in the first volcanic cycle of Yingcheng Formation and the prediction perfectly corresponds to the drilling results in well XS8 area.The results are satisfying when the prediction method were employed in the exploration and development of Qingshen gas field. 相似文献
2.
On the basis of the shape and inner structure of volcanic edifice, the dip angle and coherence were selected to recognize the buried volcanic edifices in Songliao Basin. Five volcanic edifices were recognized in both two methods in the first volcanic cycle of Yingcheng Formation and the prediction perfectly corresponds to the drilling results in well XS8 area. The results are satisfying when the prediction method were employed in the exploration and development of Qingshen gas field. 相似文献
3.
Volcanic edifices play an important role in controlling the spatial distribution of volcanic reservoirs . Taking the volcanic rocks of the Yingcheng Formation as an example , the types of volcanic formations , seismic attributes and reservoir characteristics are studied in detail using drill cores and logging and seismic data .A volcanic edifice model is established .On the basis of lithology and internal flow unit , the volcanic edifices can be divided into 4 types , including acidic lava volcanic edifices ( single flow units and composite flow units ) , rhyolitic lava debris volcanic edifices , and basaltic lava volcanic edifices .Among these types , the acidic lava volcanic edifices ( single flow unit ) consist of a single lava flow unit , and the seismic profile is characterized by a hill-like blank reflection .Additionally, this type of edifice shows a contiguous petal-like pattern in the wave-form classification chart .The acidic lava volcanic edifices ( composite unit ) consist of several acidic lava domes and plate-like lava flows , and the seismic section is a combination of parallel and hill-like reflections .This type shows noise and short-line clutter in the waveform classification diagram .The rhyolitic lava debris volcanic edi-fices have multiple layers of stacked volcanic debris .The seismic section features a draping continuous parallel reflection over a large area , and this type of edifice is characterized by a ripple pattern in the waveform classifi-cation diagram .The basaltic lava volcanic structural seismic section shows a large area of parallel reflectors . The waveform classification phase diagram shows a single and continuous distribution .The volcanic edifices with better physical properties have the following characteristics : the primary porosity belt is well developed , the units in the volcanic edifices are superimposed , and the volcanic structure is not integrated .Acidic compos-ite flow unit volcanic reservoirs have the best physical properties , and the acidic single flow unit volcanic reser-voirs are the worst .This study provided some reference for volcanic exploration and reservoir study in areas with few or no wells . 相似文献
4.
徐家围子断陷火山岩岩性种类多,岩性复杂,不同岩性岩石特征差异大,火山岩岩性、储层的地震预测难度大,亟待通过岩石物理的分析,有效指导火山岩储层地震预测。通过对13种弹性参数敏感性交会分析,首次利用密度和剪切模量将徐家围子断陷营城组复杂火山岩岩性划分为玄武岩类、安山岩类和流纹岩类3类,且同一岩类岩性都具有相同的储层参数特征,在区分岩性基础上,利用密度和纵波速度双参数可对3类岩性组的储层进行直接识别,为火山岩储层叠前反演预测技术提供理论基础。 相似文献
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长江中下游是我国重要的铁、铜、金等多金属成矿带, 其南端是鄂东南矿集区, 该区作为我国重要铁铜矿产地, 集中分布了若干富铁富铜矿床; 金牛火山岩盆地处在鄂东南矿集区西南区域, 与成矿带中多个矿区的成矿条件相似, 具有铁、铜、金等多金属矿找矿潜力。但金牛火山岩盆地具有较厚的岩浆岩和沉积岩盖层, 增加了找矿工作的困难, 需要加强技术手段的应用, 提升找矿预测效果。相邻矿集区开展的以重磁数据为主的地球物理资料综合分析工作, 为研究区构造特征分析与指导找矿奠定了良好的基础, 证明利用高精度重磁数据并结合其他地球物理资料进行综合分析解释, 可提取研究区构造格架特征、隐伏岩体和物性分布等信息, 从而推断盆地及其基底构造特征并提出找矿预测。本研究针对金牛火山岩盆地虽有找矿潜力但缺乏系统研究的问题及迫切需求, 基于实测和收集的地质与地球物理资料, 开展以重磁资料为主联合大地电磁(MT)数据的综合分析解释工作, 利用重磁异常线性信号提取、重磁异常数据多尺度分析、重磁异常反演和物性界面反演、以及电阻率成像等, 估算盆地基底深度, 圈定火山机构和隐伏岩体, 推测断裂分布、盆地边界及找矿远景区, 对于该地区基础地质调查及深部找矿预测工作具有指导作用和借鉴意义。 相似文献
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依据勘查区找矿预测理论方法,对山东省七宝山矿集区进行找矿预测研究工作,通过总结成矿地质体、成矿构造与成矿结构面、成矿作用特征标志,认为矿集区内成矿地质体为次火山岩体,成矿构造为隐爆角砾岩筒、原生断裂、次生断裂,成矿结构面为隐爆角砾岩筒、断裂及层凝灰岩与次火山岩岩性界面;成矿作用特征标志:金线头金铜矿为隐爆角砾岩+镜铁矿+硅化+黄铁矿,七宝山铜及多金属矿为构造蚀变岩+锰矿化+铁帽。建立七宝山地区陆相火山热液型矿床综合找矿预测模型,圈定七宝山找矿靶区,通过查证,发现含矿隐爆角砾岩带一条,估算求得铜金属量1.47万t;铅金属量1.39万t。本次"三位一体"研究成果,对矿集区开展找矿预测工作具有较强的指导意义。 相似文献
7.
盆地深部火山岩储层地震受能量屏蔽影响反射杂乱,使得火山岩油气藏的勘探非常困难。针对深部火山岩储层多期叠置的复杂内幕结构,研究了最优偏移距、激发周期窗口的时频电磁采集技术和时频电磁井震联合建模反演及电性节律变化火山岩期次解释技术,有效提高了该方法的深层分辨率和对深层目标的识别能力。在渤海湾盆地LD地区的研究应用效果明显,结果揭示红星构造带沙三段火山岩喷发自下而上表现出"弱-强-强-弱-弱"的"两强三弱"的特征,发育两个火山岩喷发机构,共同控制了5个期次的火山岩储层相带分布;桃园构造带沙三段各期次火山岩喷发强度明显减弱,仅发育一个火山岩喷发机构,除期次3火山岩储层相带分布范围相对较大外,其他期次火山岩主要局限分布于火山口附近,以爆发相为主,规模明显减小。后续钻探结果证实时频电磁揭示的火山岩储层分布正确,并为该区油气大发现提供了有力支撑,为探测类似的复杂目标提供了成功范例与技术方法。 相似文献
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9.
开鲁盆地为陆相火山岩盆地。勘探结果表明,在陆相火山岩盆地中获得了工业油流,为寻找石油油藏开辟了新途径。龙湾筒凹陷的火山岩以火山熔岩、火山碎屑沉积岩为主,根据岩石特征,可划分为三种岩相：溢流相、火山爆发相和火山沉积相。溢流相以熔岩为主,包括安山岩、粗面岩、粗安岩、玄武岩和玄武安山岩;火山爆发相岩石包括火山角砾岩和凝灰岩;火山沉积岩相岩石包括凝灰质砂岩、凝灰质泥岩。依据火山岩相划分,结合火山岩测井和地震反射特征,对龙湾筒凹陷火山岩纵向上的变化和平面上的展布进行了讨论,特别是对储集性能好的溢流相岩石进行了圈定。 相似文献
10.
新疆卡拉麦里姜巴斯套组火山岩地球化学特征与构造意义 总被引：7，自引：0，他引：7
通过对新疆卡拉麦里姜巴斯套组火山岩野外地质特征、岩石学和高精度同位素年代学的研究,发现姜巴斯套组火山岩具典型双峰式组合,岩石类型包括玄武岩-酸性火山碎屑岩-玄武粗面安山岩;得到玄武粗面安山岩LA-ICP-MS锆石U-Pb年龄为(319.8±2)Ma(加权均方偏差值为3),表明姜巴斯套组火山岩形成于早石炭世谢尔普霍夫阶。对火山岩地球化学特征的研究表明,姜巴斯套组火山岩钙碱性系列、高钾钙碱性系列和钾玄岩系列岩石兼而有之,岩石的稀土元素配分曲线均为轻稀土元素富集型,无明显Eu异常,玄武岩和玄武粗面安山岩具有K正异常和Sr负异常,酸性火山碎屑岩表现出Nb、Ta和Ti显著亏损。总体来说,姜巴斯套组火山岩富集大离子亲石元素,相对亏损高场强元素。玄武岩和玄武粗面安山岩表现出大陆裂谷(大陆板内拉张区域)岩石特征;酸性火山碎屑岩表现出岛弧或者活动大陆边缘岩石属性。总之,姜巴斯套组火山岩形成于卡拉麦里洋盆闭合碰撞造山后的拉张伸展环境,卡拉麦里地区在早石炭世末期就进入了碰撞后的陆内伸展拉伸阶段。 相似文献
11.
A series of volcanic rocks were developed in the deep part of Anda faulting depression. The reflection of therocks are mainly stratiform and hummocky. Three kinds of volcanic facies, e.g. explosion facies, effusion facies andsub-volcanic facies,were recognized by different reflecting characteristics in the seismic profile. The volcanic rocks areformed during three episodes of volcanic activities from Shahezi Formation to Yingcheng Formation. The volcanismshave relation to the formation of Songliao Basin and regional tectonics of northeastern China. Some of the volcanic rocksare good oil and gas reservoirs. 相似文献
12.
Self-Organizing Map is an unsupervised learning algorithm. It has the ability of self-organization,self-learning and side associative thinking. Based on the principle it can identified the complex volcanic lithology. According to the logging data of the volcanic rock samples, the SOM will be trained, The SOM training results were analyzed in order to choose optimally parameters of the network. Through identifying the logging data of volcanic formations, the result shows that the map can achieve good application effects. 相似文献
13.
Ping ZHANG Baozhi PAN 《东北亚地学研究》2007,10(1):74-77
Self-Organizing Map is an unsupervised learning algorithm.It has the ability of self-organization,self-learning and side associative thinking.Based on the principle it can identified the complex volcanic lithology.According to the logging data of the volcanic rock samples,the SOM will be trained,The SOM training results were analyzed in order to choose optimally parameters of the network.Through identifying the logging data of volcanic formations,the result shows that the map can achieve good application effects. 相似文献
14.
In the northern Songliao Basin, volcanics are fre-quently found and related closely to tectonic activi-ties during Early Cretaceous. The lava is mainly erupted along deep faults and distributed along the margine of the faulted depression. In deep part of Xujiaweizi area, natural gas exploration has been very successful, such as in the well Wang 9-12, well Shengshen 101 and well Fangshen 9 which are all highly-yield gas wells. Anda fault depression is lo-cated in the north of Xujia… 相似文献
15.
2022年1月15日,南太平洋汤加海底火山发生剧烈喷发。为了探测此次火山爆发引起的异常环境响应,利用GPS电离层数据,引入滑动四分位距法探测电离层异常扰动,结果显示：火山爆发前第22天到第27天,总电子含量出现大面积的正异常现象,部分时刻的异常超过10TECU。在火山爆发前第16天、前第10天和前第1天均出现了较轻微的负异常现象,异常均小于5TECU,其中火山爆发前第25~27天的TEC异常可能是由于太阳活动引起的。以上结果表明本研究成功利用GPS技术探测到此次火山爆发过程中的异常环境响应。 相似文献
16.
火山地区重力场变化的数值模拟 总被引：1，自引：0，他引：1
推导了火山活动引起的重力变化与地面三维位移场变化的表达公式，讨论了火山活动引起重力场变化的时空分布特征。根据火山活动的特点，采用张开型矩形位错理论模型对火山活动过程引起的地面重力场变化进行了数值模拟，并对一些火山地区观测到的重力变化进行理论解释。 相似文献
17.
ZHANG Rui CHI Xiaoguo LIU Jianfeng ZHAO Yuandong SUN Wei PAN Shiyu QUAN Jingyu 《世界地质(英文版)》2015,18(1)
By using petrological,isotope chronological,and geochemical methods,the authors studied the volcanic rocks in the studied area,mainly including dacites and trachytes. The results show that they formed during the late Early Cretaceous. Geochemically,the volcanic rocks are relatively enriched in large-ion lithophile elements( Rb,K,and Th) and depleted in high field strength elements( Nb,Ta,and Ti),and rich in light rare earth elements,and depleted in heavy rare earth elements. The fact indicates that the main body of the volcanic rocks in the Qushenla Formation was derived from the partial melting of lower crust. The lithological assemblages are characterized by continental high-K calc-alkaline and shoshonitic series,suggesting that the southward-subducting oceanic slab in southern Bangong Lake had break off and that the Bangong Lake-Nujiang Ocean had closed before 107 Ma. The main dynamic mechanisms for the genesis of this set of intermediate-acidic volcanic rocks were upwelling of the asthenosphere and partial melting of the lower crust caused by slab break-off. 相似文献
18.
WANG Pu-jun HOU Qi-jun SHU Ping HUANG Yu-long GUO Zhen-hua LI Jin-long College of Earth Sciences Jilin University Changchun Jilin China Jilin Petroleum Company Songyuan Jilin China Daqing Petroleum Company Daqing HeiLongjiang China 《东北亚地学研究》2005,(Z1)
Volcanic rocks of the late Mesozoic are very important reservoirs for the commercial natural gases including hydrocarbon, carbon dioxide and rare gases in the northern Songliao Basin. The reservoir volcanic rocks include rhyolite, andesite, trachyte, basalt and tuff. Facies of the volcanic rocks can be classified into 5 categories and 15 special types. Porosity and permeability of the volcanic reservoirs are facies-controlled. Commercial reservoirs were commonly found among the following volcanic subfacies: volcanic neck (I1) , underground-explosive breccia (I3), pyroclastic-bearing lava flow (II3), upper effusive (III3) and inner extrusive ones (IV1). The best volcanic reservoirs are generally evolved in the interbedded explosive and effusive volcanics. Rhyolites show in general better reservoir features than other types of rocks do. 相似文献
19.
利用山东地震台网70个宽频带测震台站记录的2022-01-15南太平洋汤加海底火山喷发原始地震波形数据,从时间域和频率域分析火山喷发地震波的记录特征;通过对20 s优势周期面波进行研究,测算该次火山喷发的地震学震级与地震波辐射能量。研究表明,该次汤加火山喷发的面波震级为M_(S)5.674、能量震级为M_(e)5.704,与GFZ测定震级基本一致,比USGS测定震级小0.126。本次汤加火山爆炸指数(VEI)为5级,但本文测定的地震波辐射能量为8.155×10^(12)J,可见火山喷发以地震波辐射方式释放的能量较少,绝大部分能量以超过1000 km/h的冲击波形式穿过大气层迅速释放到空中,这种能量的快速释放会抑制深部应力的挤压与拉伸。 相似文献
20.
Volcanic detrital sediments are a unique indicator for reconstructing the petrogenetie evolution of submarine volcanic terrains. Volcanic ash in surficial sediments around the Zhongsha Islands includes three kinds of volcanogenic detritus, i.e., brown volcanic glass, colorless volcanic glass and volcanic scoria. The major element characteristics show that bimodal volcanic activity may have taken place in the northern margin of the South China Sea, with brown volcanic glass and colorless volcanic glass repre-senting the maric end-member and felsie end-member, respectively. Fractional crystallization is the main process for magma evolu-tion. The nature of the volcanic activity implies that the origin of volcanic activity was related to extensional tectonic settings, which is corresponding to an extensional geodynamie setting in the Xisha Trench, and supports the notion, which is based on geophysical data and petrology, that there may exist a mantle plume around the Hainan Island. 相似文献