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首页> 外文学位 >Integrated geophysical investigations of linkages between Precambrian basement and sedimentary structures in the Ucayali basin, Peru Fort Worth basin, Texas and Osage County, Oklahoma.
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Integrated geophysical investigations of linkages between Precambrian basement and sedimentary structures in the Ucayali basin, Peru Fort Worth basin, Texas and Osage County, Oklahoma.

机译：在德克萨斯州的乌卡亚里盆地，秘鲁的沃思堡盆地和俄克拉荷马州的欧塞奇县，前寒武纪基底与沉积结构之间联系的综合地球物理研究。

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摘要

I conducted integrated geophysical studies within the Fort Worth basin, Texas Osage County, Oklahoma, and the Ucayali basin, Peru. My studies are directed at understanding the relationships or links between Precambrian basement structures and sedimentary structures using these three areas as case studies. Links between basement structure, hydrocarbon reservoirs, and sedimentary sequences are not a new concept. Such relationships have been documented in the Paradox, Hardeman, Anadarko, Arkoma, Ardmore and Williston basins among others. Structures such as fault zones that can influence the formation of sedimentary basins and mineral deposits are often formed by intraplate tectonism.In order to compare the relationship between the Precambrian basement structures and sedimentary structures, I analyzed series of derivative and filtered maps of aeromagnetic and gravity data, which enhance basement structures, that were integrated with seismic data and seismic attribute data that enhance structures within the sedimentary sections. Other information such as well data and geologic information etc were also integrated. This integrated workflow facilitates the comparison of the links or relationships between the two structures.The results of the Fort Worth basin are presented in Chapter 3. The results of this integrated study show that the sedimentary structures within the study area are mainly related to basement structures because these structures are aligned parallel to anomalies identified on the high-resolution aeromagnetic (HRAM) data. The northeast-southwest and northwest-southeast orientations of sedimentary features are consistently parallel with Precambrian structural fabrics that are associated with structures such as the northeast trending Ouachita orogenic belt and the northwest trending Muenster Arch, which reactivated a late Cambrian/Late Precambrian faults. The knowledge gained in this study will impact oil and gas exploration and development within the study area because, the orientation of the natural and induced fractures can be predicted even if seismic data is limited or unavailable.In Chapter 4, the results of an integrated analysis that includes the use of 3D seismic data, seismic attributes, and derivative maps from potential field data to study the basement, Mississippi Chert and the Arbuckle Group of Osage County, Oklahoma are presented. The workflow employed in this study was effective in studying and identifying polygonal, highly coherent, and high amplitude lineaments that strike northwesterly and northeasterly within these reservoirs. Basement structure lineaments are found to be parallel in orientation with the trend of lineaments seen within the Mississippian Chert and the Arbuckle Group. The northwest-striking lineaments may be related to the late-Paleozoic tectonism that affected both the Precambrian and Paleozoic section of Osage County. Another part of this research investigated the large gravity and magnetic anomalies and their association with the Mid-Continent Rift System (MCRS). Results of this analysis revealed prominent northeast trending anomalies that suggest that the MCRS extends into northern Oklahoma. However, geochronological data for basement rocks suggest that this extension would have to be limited to intrusive bodies that have little or no subcrops.The integrated study conducted in the Ucayali basin of Peru revealed that the northwest-southeast trending lineaments interpreted as Precambrian basement structures are sub-parallel to the late Paleozoic fold and thrust belts that resulted from the shortening associated with the formation of the Andes. These fold and thrust belts are reactivated along the zones of weaknesses that already existed in the Precambrian basement. The east-northeast lineaments are located beneath the Fitzcarrald Arch locate above the buoyant Nazca ridge. I interpret these east-northeast lineaments as part of the Ene Pisco -- Abancay Fitzcarrald tectonic lineaments, which is one of the five tectonic domains in these region. Gravity modeling suggests that the crustal thickness and the subduction slab-dip beneath Peru increase from the north of the Ucayali basin towards the south. My 2-dimensional gravity model suggests that the crust thickness and Nazca plate dip increase southward within the Ucayali basin. These results also establish a correlation between known geologic features and the regional gravity anomalies.
机译：我在俄克拉何马州德克萨斯州奥塞奇县沃思堡盆地和秘鲁乌卡亚里盆地进行了综合地球物理研究。我的研究旨在通过使用这三个领域来了解前寒武纪基底结构与沉积结构之间的关系或联系。地下室结构，油气藏和沉积层序之间的联系并不是一个新概念。这种矛盾在悖论，哈德曼，阿纳达科，阿科玛，阿德莫尔和威利斯顿盆地中都有记载。板内构造常常形成诸如断层带等可能影响沉积盆地和矿床形成的结构。为了比较前寒武纪基底结构与沉积结构之间的关系，我分析了一系列的航磁和重力导数图和滤波图增强地下室结构的数据，与地震数据和地震属性数据集成在一起，这些数据增强了沉积部分的结构。还整合了其他信息，例如井数据和地质信息等。这种集成的工作流程有助于比较这两个结构之间的联系或关系。第3章介绍了沃思堡盆地的结果。该集成研究的结果表明，研究区内的沉积结构主要与基底结构有关。因为这些结构与高分辨率航空磁（HRAM）数据上识别的异常平行对齐。沉积特征的东北-西南和西北-东南方向始终与前寒武纪构造纤维平行，与构造相关，例如东北趋势的瓦希塔造山带和西北趋势的明斯特拱门，重新激活了晚寒武世/晚前寒武纪断层。本研究中获得的知识将影响研究区域内的油气勘探与开发，因为即使地震数据有限或不可用，自然裂缝和诱发裂缝的方向也可以预测。第四章，综合分析的结果其中包括使用3D地震数据，地震属性以及来自潜在野外数据的导数图来研究地下室的方法，包括密西西比州切尔特市和俄克拉荷马州奥塞奇县的Arbuckle集团。本研究中使用的工作流程有效地研究和识别了在这些油藏内向西北和东北方向移动的多边形，高度连贯和高振幅的构造。人们发现，地下室结构的构造与密西西比切尔特和阿尔巴克勒集团内部的构造趋势是平行的。西北走向的构造可能与影响奥塞奇县前寒武纪和古生代的古生代晚期构造有关。这项研究的另一部分调查了大的重力和磁异常及其与中陆裂谷系统（MCRS）的关系。分析结果表明东北部地区有明显的东北异常，这表明MCRS延伸到俄克拉荷马州北部。然而，地下岩石的地质年代学数据表明，这种扩展将仅限于没有或几乎没有子作物的侵入体。在秘鲁的Ucayali盆地进行的综合研究表明，西北-东南走向的构造被解释为前寒武纪基底结构是与安第斯山脉形成相关的缩短导致的古生代晚期褶皱和逆冲带次平行。这些褶皱和逆冲带沿着前寒武纪基底中已经存在的弱点区域重新激活。东北向线系位于菲兹卡拉尔拱门下方，位于活跃的纳斯卡山脊上方。我将这些东西向的东西系解释为Ene Pisco-Abancay Fitzcarrald构造东西系的一部分，这是这些地区的五个构造域之一。重力模拟表明，秘鲁的地壳厚度和俯冲平板倾角从乌卡亚利盆地的北部向南部增加。我的二维重力模型表明，地壳厚度和纳斯卡板倾角在乌卡亚利盆地内向南增加。这些结果还建立了已知地质特征与区域重力异常之间的相关性。

著录项

  • 作者

    Elebiju, Olubunmi Olumide.;

  • 作者单位

    The University of Oklahoma.;

  • 授予单位 The University of Oklahoma.;
  • 学科 Geology.Geophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 194 p.
  • 总页数 194
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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