3种经典机器学习算法在火山岩测井岩性识别中的对比     

牟丹  张丽春  徐长玲 《吉林大学学报(地球科学版)》2021,51(3):951-956

岩性识别一直是火山岩油气勘探中的重要课题,基于测井数据的岩性识别也逐渐成为火山岩研究的需要,大数据背景下的机器学习算法为测井岩性识别提供了一个新方向。为提高某研究区火山岩岩性识别符合率,本文采用K近邻、支持向量机和自适应增强3种经典机器学习算法,对研究区内的粗面岩、非致密粗面岩、辉绿岩、辉长岩、玄武岩和非致密玄武岩等6类中基性火山岩进行岩性识别。从常规测井系列中优选对研究区岩性敏感的自然伽马、声波时差、补偿中子、深侧向电阻率和补偿密度等5种测井参数作为岩性识别模型的输入向量,从研究区内5口有岩心样品或薄片鉴定资料的目标层中选取测井数据点1 440个,其中960个作为训练样本,其余480个作为测试样本。以识别符合率和时间作为评价指标,对3种算法的识别结果进行对比分析,实验表明：自适应增强算法的分类准确率最高,6类岩性平均识别符合率达到82.10%;支持向量机算法表现良好,平均识别符合率为81.04%;K近邻算法平均识别符合率为76.04%。  相似文献   

Kuramoto Model with Non-symmetric Coupling Reconstructs Variations of the Solar-Cycle Period     

E. Blanter  J.-L. Le Mouël  M. Shnirman  V. Courtillot 《Solar physics》2016,291(3):1003-1023

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Geochemistry of Sandstones from the Silurian Hanxia Formation,North Qilian Belt,China: Implication for Provenance,Weathering and Tectonic Setting   总被引：1，自引：0，他引：1  

Qian Hou  Chuanlong Mou  Qiyu Wang  Zhiyuan Tan  Xiangying Ge  Xiuping Wang 《Geochemistry International》2018,56(4):362-377

The North Qilian orogenic belt is the key to figure out the evolution and assembly of Asia. The Upper Silurian Hanxia Formation which is deposited in the north area of North Qilian Orogenic Belt is of utmost important to reveal the architecture and orogenic process of the North Qilian belt. So provenance analysis of the Hanxia Formation is of significance to reveal not only that the tectonic evolution of the central orogenic belt China, but also that Paleozoic Asia plate reconstruction. The ratios of elements and some discrimination diagrams based on geochemistry indicate that felsic rocks constitute their main source rocks. The chemical index of alteration is less than 80, indicating that the source rocks are relatively fresh and of low maturity. On the Th/Sc versus Zr/Sc scatter plot, samples from Hanxia Formation occur along the magmatic compositional variation trend of rocks, indicating that the rocks did not undergo obvious sedimentary sorting and recycling. The major and trace elements discrimination diagrams imply that Hanxia Formation rocks were derived from continental island arc. Recent studies show that the North China plate subducted southwards and produced subduction-related arc magmatism along the southern margin of the North Qilian Terrane during the Silurian. Therefore, we infer that in the late Silurian period the subduction-related arc became accreted to the Central Qilian terrane to the south, forming a composite continental arc, and the North Qilian belt accumulated in a fore-arc basin.  相似文献   

塔里木盆地柯坪地区寒武系肖尔布拉克组下段古生产力研究          下载免费PDF全文

白忠凯  谢李  韩淼  吕修祥  孙智超  李清瑶  杨有星  张金虎 《中国地质》2018,45(2):227-236

基于塔里木盆地柯坪地区寒武系地质剖面观测和75个样品分析测试的基础上,研究了柯坪冲断带下寒武统肖尔布拉克组下段碳酸盐岩古生产力。利用Ti扣除样品中来自陆源部分而得出生源元素的含量,Baxs、Cuxs和Znxs三种营养元素测量和数据处理结果表明它们相对自生富集,具备一定的古生产力水平,个别层段值较高,有较高古生产力水平。发育光面具缘藻(Leiomarginata)、粒面具缘藻(Granomarginata)、网面球藻(Dictyotidium)等疑源类生烃母质,为有机质沉积和烃源岩发育提供了物质基础。Pr/Ph、V/(V+Ni)、U/Th比值和δCe值判定该区下寒武统肖尔布拉克组下段为还原沉积环境,为烃源岩有机质的赋存提供了有利条件。有机质类型为I-II型,达到了高成熟阶段,具备生烃潜力。研究区寒武系下统肖尔布拉克组下段发育优质潜在烃源岩。  相似文献   

Wind wave characteristics and engineering environment of the South China Sea     

Zhifeng Wang  Liangming Zhou  Sheng Dong  Lunyu Wu  Zhanbin Li  Lin Mou  Aifang Wang 《中国海洋大学学报(英文版)》2014,13(6):893-900

Wave simulation was conducted for the period 1976 to 2005 in the South China Sea (SCS) using the wave model, WAVEWATCH-III. Wave characteristics and engineering environment were studied in the region. The wind input data are from the objective reanalysis wind datasets, which assimilate meteorological data from several sources. Comparisons of significant wave heights between simulation and TOPEX/Poseidon altimeter and buoy data show a good agreement in general. By statistical analysis, the wave characteristics, such as significant wave heights, dominant wave directions, and their seasonal variations, were discussed. The largest significant wave heights are found in winter and the smallest in spring. The annual mean dominant wave direction is northeast (NE) along the southwest (SW)-NE axis, east northeast in the northwest (NW) part of SCS, and north northeast in the southeast (SE) part of SCS. The joint distributions of wave heights and wave periods (directions) were studied. The results show a single peak pattern for joint significant wave heights and periods, and a double peak pattern for joint significant wave heights and mean directions. Furthermore, the main wave extreme parameters and directional extreme values, particularly for the 100-year return period, were also investigated. The main extreme values of significant wave heights are larger in the northern part of SCS than in the southern part, with the maximum value occurring to the southeast of Hainan Island. The direction of large directional extreme H _s values is focus in E in the northern and middle sea areas of SCS, while the direction of those is focus in N in the southeast sea areas of SCS.  相似文献   

潘庄地区煤层气U型水平井技术工艺研究   总被引：2，自引：0，他引：2  

牟全斌  韩保山  张培河  赵永哲 《中国煤炭地质》2014,(11):53-56

我国已在多个地区进行了20余口煤层气U型水平井施工,但总体尚处于勘探实验阶段。为了研究潘庄地区煤层气U型水平井施工技术工艺,以寺河井田西区煤层气U型水平井为例,分析了实验区地质条件的可行性,重点研究了钻井技术工艺并初步考察了产气效果。结果表明：潘庄地区3#煤层含气量大、构造及水文地质条件简单,煤层产状稳定且厚度较大,原生结构煤体发育,比较适合U型水平井的施工。煤层气U型水平井具有技术工艺复杂、增产效果明显的特点,先进的工具仪器和技术工艺为煤层气U型水平井施工成功提供了技术保障,其最高产气量达到22 000m^3/d,相当于5-6口普通高产垂直井的产气效果,可为煤矿区煤层气抽采利用提供关键技术支撑。  相似文献   

塔里木盆地东南坳陷侏罗系展布特征研究          下载免费PDF全文

孙智超  苗苗青  王继勋  程明华  白忠凯  张金虎 《中国地质调查》2014,6(4):24-29

塔东南坳陷位于塔里木盆地的东南部,勘探程度较低。侏罗系为该区主要油气勘探目的层,明确塔东南坳陷侏罗系展布特征是实现该区油气突破的关键问题。通过分析2015年后实施的最新钻探工程以及最新采集处理的地震、电法剖面,结合钻测井、露头资料,研究塔东南侏罗系分布范围及厚度,结果表明侏罗系在塔东南坳陷广泛发育,仅在且末凸起西部局部地区缺失; 瓦石峡凹陷侏罗系十分发育,沉积厚度大,分布范围广,并向阿尔金山前有明显加厚趋势,可作为塔东南坳陷油气勘探目标区。  相似文献   

焉耆盆地焉耆隆起区石油地质条件初探          下载免费PDF全文

张金虎  高永进  杨有星  周新桂  白忠凯  孙智超  金芸芸  王立新 《中国地质调查》2014,6(4):30-39

焉耆盆地经历了20多年的勘探开发,取得了一系列认识,但目前急需开辟新的油气勘探领域来缓解增储上产的压力。焉耆隆起区是盆地的油气远景区,通过新焉参1井钻探,初步分析了研究区石油地质条件,明确了其缺失中生界大部分地层,缺乏油源和有效的油气运移通道。讨论后认为应继续探索隆起区油气成藏的可能性,加强焉耆隆起区与博湖坳陷构造演化关系的研究,寻找有效的油气运移通道及隐蔽型油气藏。这些认识对今后焉耆盆地的勘探具有重要意义。  相似文献   

西准白杨河铍矿床萤石及流体包裹体特征   总被引：3，自引：0，他引：3  

杨文龙  Mostafa Fayek  李彦龙  王谋  周剑 《新疆地质》2014,(1):82-86

利用激光测温学和激光拉曼光谱方法,通过镜下观察,研究了白杨河铍矿床与铍成矿作用有关的脉石矿物(萤石),将萤石分为4个期次,其中第三期萤石与铍成矿关系最密切。萤石流体包裹体具低盐(0.7%~7.0%)、低温(89.7℃~188.9℃)的特征,第三期萤石脉流体包裹体成矿温度99.4℃~120.5℃,成矿盐度3.5%~5.4%,与铍矿物属同一期,揭示出该矿床成矿流体为低温、低盐度热液。  相似文献   

贵州铜仁瓦屋牛蹄塘组下部凝灰岩锆石年龄及其地质意义          下载免费PDF全文

牟军  强希润  覃永军  王安华  张厚松 《贵州地质》2022,39(1):39-47

运用LA-ICP-MS技术,对牛蹄塘组凝灰岩夹层进行锆石U-Pb年代学测试,获得凝灰岩的年龄为546.3±4.3 Ma,该年龄与Chen等(2003)运用Pb-Pb淋滤法获得的遵义中南和织金牛蹄塘组黑色页岩的沉积年龄(531±24 Ma)在误差范围内一致,与卓皆文等(2009)运用锆石U-Pb年代学获得铜仁坝黄震旦纪老...  相似文献