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首页> 外文学位 >Evaluation of the deposition, lithology and diagenesis of the San Andres Formation in the Eastern Shelf of the Midland Basin, Tom Green County, Texas.
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Evaluation of the deposition, lithology and diagenesis of the San Andres Formation in the Eastern Shelf of the Midland Basin, Tom Green County, Texas.

机译：德克萨斯州汤姆格林县中部盆地东架圣安德列斯组沉积，岩性和成岩作用的评价。

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摘要

The Eastern Shelf of the Midland Basin hosts extensive Permian-age strata that have been exploited for petroleum resources throughout the past century. Current activities in the region are focusing on secondary and tertiary recovery of hydrocarbons, which requires more detailed geologic characterization of producing zones. This study investigated the San Andres Formation across the western half of Tom Green County, Texas, encompassing approximately 1500 square miles or one million acres. Petrophysical logs and core across the study area were used to evaluate variations in lithology and rock composition. Data was analyzed to determine the structural nature of the San Andres strata in the study area and to develop isopach maps that evaluate spatial variability in depositional thickness on the Eastern Shelf. Cross-plot analyses of petrophysical logs were performed to differentiate lithological composition.;The analyses of this study concluded that San Andres deposition on the Eastern Shelf in Tom Green County, Texas, consisted of migrating, coarse-grained shoals along the margin of Permian Basin continental interior. Clastic inputs from the east were relatively constant, while wackestone and packstone carbonate shoals shifted in response to sea level change and wave energy in the subtidal to intertidal coastal zone along the margin of the Midland Basin. Diagenetic alteration of strata resulted in the replacement of anhydrite facies with calcite and extensive dolomitization of highly permeable wackstone and packstone facies.;The economic importance of the study area reveals that approximately one million barrels of oil have been already extracted from the region through conventional means. New technologies of drilling and well development may enable residual hydrocarbons still in place to be extracted by unconventional means. Studies like this one provide the necessary geologic insight to enable the development of unconventional oil extraction methods in long exploited oil fields.
机译：Midland盆地的东部大陆架拥有广泛的二叠纪时代地层，在过去的一个世纪中，该地层一直被用于石油资源。该地区目前的活动重点是碳氢化合物的二次和三次采收，这需要对生产区进行更详细的地质特征描述。这项研究调查了横跨德克萨斯州汤姆格林县西半部的圣安德列斯组，覆盖约1500平方英里或100万英亩。研究区域的岩石物理测井和岩心用于评估岩性和岩石组成的变化。分析数据以确定研究区域圣安德列斯地层的结构性质，并开发等值线图，以评估东部大陆架上沉积厚度的空间变异性。进行了岩石物理测井的交叉图分析，以区分岩性成分。这项研究的分析得出结论，得克萨斯州汤姆格林县东架上的圣安德列斯沉积物是由沿二叠纪盆地边缘迁移的粗粒浅滩组成的大陆内部。东部的碎屑输入相对恒定，而瓦克石和碳酸盐岩的浅滩响应海平面变化和中部盆地边缘的潮下至潮间带海岸带的波能而移动。地层的成岩作用改变导致方解石取代了硬石膏相，并且使高渗透性的瓦克石和pack石相广泛地白云石化。研究区域的经济意义表明，已经通过常规手段从该地区开采了约一百万桶石油。钻探和钻井开发的新技术可能使非常规方式提取仍在开采的残余烃。像这样的研究为在长期开采的油田中开发非常规采油方法提供了必要的地质见解。

著录项

  • 作者

    Bertram, Harold Kenneth.;

  • 作者单位

    Stephen F. Austin State University.;

  • 授予单位 Stephen F. Austin State University.;
  • 学科 Petroleum Geology.
  • 学位 M.S.
  • 年度 2011
  • 页码 112 p.
  • 总页数 112
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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