共查询到18条相似文献，搜索用时 140 毫秒
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以地震反演为主,结合测井、岩石物理、地震相和正演模拟等技术综合研究火成岩的速度场特征。岩石物理实验是研究火成岩物性参数有效的工具,实验数据的分析能帮助预测火成岩岩性和速度信息,为反演等工作利用地震资料描述火成岩提供依据。原始测井曲线的环境校正和标准化处理是高品质合成记录和反演效果的前提条件。稀疏脉冲反演、基于模型的反演和神经网络反演这三种方法结果的分辨率较原始地震数据有了很大提高,从中可识别出火成岩的空间展布,但基于模型的反演分辨率相对较高。伽马属性反演的分辨率在识别火成岩方面比上述三种方法要高得多,但是单一的属性又很难满足火成岩特征描述的要求,因此多参数融合是一种行之有效的方法。结合地震相的应用,最终得到符合地质特征的火成岩三维速度场,并通过误差分析和正演模拟验证了速度场精度,为变速度成图和低幅构造勘探提供了科学的依据。 相似文献
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通过实例介绍利用地震多属性与测井成果联合反演,获得表征煤层顶底板岩石赋水性强弱的拟测井参数体,进而对其进行赋水性分析：首先利用伽马-伽马测井及视电阻率曲线重构岩石视孔隙度曲线,以获得研究区岩石视孔隙度成果;利用测井成果合成地震记录进行精细的地震地质层位标定及采区地震数据的保幅、保真处理;在测井成果约束下进行地震多属性拟测井多参数反演,利用反演成果的高低异常区评价煤层顶底板赋水强弱分区——低波阻抗、低电阻率、高孔隙度分布的区域对应赋水性强的区域,反之为赋水性弱的区域。 相似文献
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综合利用岩芯,测井,地震资料预测孔隙度 总被引：2，自引：0，他引：2
综合利用岩芯、测井、地震资料预测储层孔隙度，首先是利用分辨率高的测井、岩芯资料建立关系模式，然后利用地震层速度计算孔隙度。在远离钻井的地区，也能确定孔隙度的分布情况。文章还介绍了该方法在三个地区的实际应用。 相似文献
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本文采用非线性反演技术建立了岩性约束反演计算方法，用于地层岩性解释和储层模拟、描述等方面。文中讨论了岩性正演数学模型的建立、初始模型的选取和约束条件对反演结果的影响。给出了综合利用地震、测井和地质资料计算孔隙度和泥质含量的反演结果，并分析了反演精度。理论模型计算结果说明了岩性约束反演的可行性和正确性。并给出Ｓｕｎ工作站上应用该软件处理某油田实际资料的岩性反演结果。 相似文献
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古潜山火成岩裂缝带划分与孔隙度计算 总被引：3，自引：0，他引：3
针对火成岩岩性成分复杂，常规测井难以正确划分岩性，严重阻碍了储层参数的定量计算。本文提出模糊聚类划分岩性，采用综合概率法与混合体积模型计算裂缝孔隙度、有效孔隙度等参数。其测井解释结果与井壁取心和地质描述资料对照，完全吻合。 相似文献
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测井约束反演在高分辨率层序地层学中的应用 总被引：11，自引：0，他引：11
以新疆吐哈盆地温米油田为例 ,探讨应用测井约束地震反演资料进行高分辨率时间地层单元对比的思路和方法。研究表明 ,由于测井约束反演不仅可提高原始地震资料的垂向分辨率 ,而且可将地震波转换为层的信息 ,因此 ,据此可进行高精度的时间地层单元的追踪对比。在油田开发阶段 ,应用测井约束反演资料进行高分辨率等时地层对比的步骤包括 :地震资料的时 -深转换 ;应用地质、测井、地震资料建立宏观层序地层格架 ;测井约束地震反演处理 ;测井细分层及标定 ;时间地层单元的追踪对比 相似文献
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裂缝作为有效的储集空间和渗流通道,对于页岩储层具有重要的作用。裂缝研究的难点在于难以像井震结合波阻抗反演一样综合测井和地震信息开展裂缝预测。提出了一种综合测井和地震信息预测裂缝的新思路:首先拓展了SPM软孔模型,把孔隙空间分为硬孔隙、基质孔隙和裂缝型孔隙,建立岩石物理模型,并求取裂缝型孔隙度曲线,通过FMI成像测井曲线证实了裂缝型孔隙度结果的可靠性;然后综合裂缝型孔隙度测井曲线和地震数据,通过多属性神经网络反演预测实现了裂缝型孔隙度的定量预测。研究成果表明,通过和原始测井曲线以及和蚂蚁体等地震几何属性的对比,证明裂缝型孔隙度反演结果比较可靠,可以用来定量解释页岩储层的裂缝发育程度。本研究实现了综合测井曲线和地震信息定量预测页岩储层裂缝发育程度的方法,对于页岩储层定量解释具有重要的意义。 相似文献
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测井约束地震反演分辨率及反演策略探讨 总被引：1，自引：0，他引：1
从地震反演的本质出发,分析了测井约束地震反演的分辨率与地震资料本身分辨率之间的关系,探讨了测井约束地震反演的基本策略,指出将地震属性技术、地震地层学研究方法应用于测井约束地震反演可以提高反演效果及可靠性。 相似文献
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HETEROGENEITY OF THE LITHOSPHERE IN TIBETAN PLATEAU ON THE CONSTRAINTS OF MAGMATISM 相似文献
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The distribution of oil and gas resources in the South China Sea and adjacent areas is closely related to the structural pattern that helped to define the controlling effect of deep processes on oil-bearing basins.Igneous rocks can record important information from deep processes.Deep structures such as faults,basin uplift and depression,Cenozoic basement and magnetic basement are all the results of energy exchange within the earth.The study of the relationship between igneous rocks and deep structures is of great significance for the study of the South China Sea.By using the minimum curvature potential field separation technique and the correlation analysis technique of gravitational and magnetic anomalies,the fusion of gravitational and magnetic data reflecting igneous rocks can be obtained,through which the igneous rocks with high susceptibility/high density or high susceptibility/low density can be identified.In this study area,igneous rocks do not develop in the Yinggehai basin,Qiongdongnan basin,Zengmu basin and Brunei-Sabah basin whilst igneous rocks with high susceptibility/high density or high susceptibility/low density are widely-developed in other basins.In undeveloped igneous areas,faults are also undeveloped the Cenozoic thickness is greater,the magnetic basement depth is greater and the Cenozoic thickness is highly positively correlated with the magnetic basement depth.In igneously developed regions,the distribution pattern of the Qiongtai block is mainly controlled by primary faults,while the distribution of the Zhongxisha block,Xunta block and Yongshu-Taiping block is mainly controlled by secondary faults,the Cenozoic thickness having a low correlation with the depth of the magnetic basement. 相似文献
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遵循区域岩石圈系统的组成和状态制约区域各类地质—地球化学作用过程的性质和特征,以及各类地质—地球化学过程引起的物质分异和循环反映区域岩石圈发展和演化的构想,分析了秦巴地壳的化学和岩石组成特征及岩石圈的高热流状态,并据之阐明秦巴花岗岩类多具有Ⅰ型和Ⅰ—S混合型特征及该区缺乏与花岗岩类有关的典型岩浆期后热液矿床的原因,同时由该区花岗岩类岩石多具有黑云母组合和角闪石组合脱水熔融特征,揭示了多数花岗岩浆形成的较高熔融程度及有大量未经风化沉积旋回的岩浆岩加入了岩浆的源区,从而为秦巴上、下地壳化学成分差异小、物质分异弱找到了较合理的解释。本例表明在区域成岩和成矿研究中,区域岩石圈组成和状态的分析具有重要意义。 相似文献
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QIN Xiaofeng WANG Zongqi ZHANG Yingli PAN Luozhong HU Guiang ZHOU Fusheng 《《地质学报》英文版》2012,86(5):1182-1199
The Napo-Qinzhou Tectonic Belt (NQTB) lies at the junction of the Yangtze, Cathaysia and Indochina (North Vietnam) Blocks, which is composed of five major lithotectonic subunits: the Qinzhou-Fangcheng Suture Zone (QFSZ), the Shiwandashan Basin (SB), the Pingxiang-Nanning Suture Zone (PNSZ), the Damingshan Block (DB) and the Babu-Lingma Suture Zone (BLSZ). On the basis of geochemical compositions, the Permian mafic igneous rocks can be divided into three distinct groups: (1) mafic igneous rocks (Group 1) from the Longjing region in the PNSZ and Hurun region in the BLSZ, which are characterized by intermediate Ti, P and Zr with low Ni and Cr contents; (2) mafic igneous rocks (Group 2) from the Naxiao and Chongzuo region in the DB, characterized by low-intermediate Ti, P and Zr with high Ni and Cr concentrations; and (3) mafic igneous rocks (Group 3) from the Siming region in the Jingxi carbonate platform of the northwestern margin of the NQTB, with intermediate-high Ti, P and Zr and low Ni and Cr contents. The Group 1 rocks yield a weighted mean 206Pb/238U age of 250.5±2.8 Ma and are geochemically similar to basalts occurring in back-arc basin settings. The Group 2 rocks exhibit geochemical features to those basalts in island arcs, whereas the Group 3 rocks show geochemical similarity to that of ocean island basalts. All three groups are characterized by relatively low εNd(t) values (–2.61 to +1.10) and high initial 87Sr/86Sr isotopic ratios (0.705309–0.707434), indicating that they were derived from a subduction-modified lithospheric mantle and experienced assimilation, fractional crystallization, and crustal contamination or mixing during magmatic evolution. Accordingly, we propose the existence of an arc-back arc basin system that developed along the NQTB at the border of SW Guangxi Province (SW China) and northern Vietnam, and it was formed by continued northwestward subduction of the Cathaysian (or Yunkai) Block under the Yangtze Block, and northeastward subduction of the Indochina Block beneath the Yangtze Block during Permian time. 相似文献
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TANG Huafeng ZHAO Zhigang TIAN Zhiwen LU Baoliang TANG Wu HE Kailun ZHU Chenxi WANG Pujun 《《地质学报》英文版》2021,95(1):280-293
Based on the volume magnetic susceptibility and specific gravity measurements and mineral and lithologic identification results for 540 samples,the rock type,density,and magnetic susceptibility of rocks from northern Borneo were analyzed,and the applicability of gravity and magnetic data to the lithologic identification of the Mesozoic strata in the southern South China Sea was assessed accordingly.The results show that there are 3 types and 25 subtypes of rocks in northern Borneo,mainly intermediate-mafic igneous rocks and exogenous clastic sedimentary rocks,with small amounts of endogenous sedimentary rocks,felsic igneous rocks,and metamorphic rocks.The rocks that are very strongly-strongly magnetic and have high-medium densities are mostly igneous rocks,tuffaceous sandstones,and their metamorphic equivalents.The rocks that are weakly magnetic-non-magnetic and have medium-very low densities are mostly conglomerates,sandstones,siltstones,mudstones,and coal.The rocks that are weakly magnetic-diamagnetic and have highmedium densities are mostly limestones and siliceous rocks.The Cenozoic rocks are characterized by low densities and medium susceptibilities;the Mesozoic rocks are characterized by medium densities and medium-high susceptibilities;and the pre-Mesozoic rocks are characterized by high densities and low magnetism.Based on these results and the distribution characteristics of the various rock types,it was found that the pre-Mesozoic rocks produce weak regional gravity anomalies;the Mesozoic sedimentary rocks produce negative regional gravity anomalies;whereas the Mesozoic igneous rocks produce positive regional gravity anomalies;and the Cenozoic igneous rocks produce positive regional gravity anomalies.The regional high magnetic anomalies in the southern part of the South China Sea originate from the Mesozoic mafic igneous rocks and their metamorphic equivalents;and the regional medium magnetic anomalies may be produced by the felsic igneous rocks and their metamorphic equivalents.Accordingly,the identification of the Mesozoic lithology in the southern South China Sea shows that the Mesozoic sedimentary rocks are distributed over a large area of the southern South China Sea.Thus,it is concluded that the Mesozoic strata in this area have the potential for oil and gas exploration. 相似文献
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粤北大宝山矿区加里东期火山岩的厘定及其地质意义 总被引：6，自引：2，他引：4
粤北大宝山矿区一带出露一套与层状Fe-Cu-Pb-Zn矿化紧密共生的层状火成岩。层状火成岩产状与上覆页岩及大理岩和下伏碳质页岩基本一致。本文通过层状火成岩显微特征及锆石年龄探讨火成岩形成环境及时代。层状火成岩为斑状结构,块状构造,局部发育条带状构造及流动构造。层状火成岩的斑晶主要由火山喷发形成的棱角明显石英、斜长石、钾长石、少量角闪石、黑云母及黄铁矿等晶屑及少量岩屑组成,基质为火山熔浆凝结形成的全晶质矿物,主要由粒度极细的石英、钾长石、绢云母、白云母及少量黑云母等组成,石英和钾长石构成典型的霏细结构。层状火成岩含大量火山碎屑及具流动构造等现象表明其为火山碎屑熔岩类,主要为英安质凝灰熔岩、流纹质凝灰熔岩及角砾熔岩。大宝山矿区中部流纹质凝灰熔岩和东部丘坝一带英安质凝灰熔岩的锆石LA-ICP-MS U-Pb年龄分别为436.4±4.1Ma,MSWD=0.94和434.1±4.4Ma,MSWD=1.9,是加里东期形成的。据大宝山矿区熔岩锆石U-Pb年龄,结合层状熔岩和灰岩及碳质页岩紧密共生及区域深大断裂构造活动特征,我们认为大宝山与层状矿化关系密切的层状火成岩为加里东期海相火山熔岩,粤北一带加里东期海相火山活动可能和形成于加里东期的吴川-四会深大断裂活动有关。 相似文献
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物源区原始剥蚀地貌的恢复以及与砂体、优质储层之间的关系是源－汇系统分析中非常重要的部分.利用钻井、三维地震以及分析化验等资料,恢复了石臼坨凸起东段围区沙一二段储层的古物源分布,并探讨了古物源对储层的影响.结果表明:（1）研究区沙一二段发育近源扇三角洲砂砾岩储层,东部古物源的母岩类型为白垩系中酸性火成岩,西部古物源的母岩类型为中生界碎屑岩夹薄层中酸性火成岩,均非现今残留的基岩分布.（2）受母岩差异的影响,东部火成岩的母岩剥蚀后更容易形成规模较大的砂砾岩体.（3）受物源区母岩和沉积区储层成岩作用差异的共同影响,东部储层中中酸性火成岩岩屑和砾石等易溶组分含量高,粒度较粗,以碳酸盐胶结为主,在成岩过程中,中酸性火成岩砾石、岩屑易遭受强烈溶蚀作用,次生孔隙发育,但受碳酸盐矿物进一步强烈的胶结,储层物性呈低孔低渗特点;西部储层中变质岩岩屑和石英等难溶组分含量高,填隙物以粘土类为主,原生孔隙发育,储层物性呈中高孔高渗的特点. 相似文献