...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>AAPG Bulletin >Surface sediment hydrocarbons as indicators of subsurface hydrocarbons: Field calibration of existing and new surface geochemistry methods in the Marco Polo area, Gulf of Mexico
【24h】

Surface sediment hydrocarbons as indicators of subsurface hydrocarbons: Field calibration of existing and new surface geochemistry methods in the Marco Polo area, Gulf of Mexico

机译：地表沉积物碳氢化合物作为地下碳氢化合物的指示剂：墨西哥湾马可波罗地区现有和新的地面地球化学方法的现场校准

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Multiple methods are currently used to collect, prepare, extract, and analyze near-surface migrated hydrocarbons from marine sediments to evaluate subsurface petroleum generation and entrapment. Few have been rigorously tested to evaluate their effectiveness. A Gulf of Mexico field calibration survey over the Marco Polo field was undertaken as part of an industry-funded research project to better understand previously published and unpublished seabed geochemical results and determine which gas and liquid hydrocarbon extraction methods best characterize migrated hydrocarbons in near-surface sediments. The Marco Polo calibration data set demonstrates the importance of targeted coring and sampling depth. To improve the detection of seabed migrated thermogenic hydrocarbons, core samples should be collected along major migration pathways (cross-stratal leakage features) identified by conventional deep seismic and high-resolution sea floor imaging. Not all targeted cores hit the designated feature, and thus, collecting replicates along key migration features is critical. Collecting sediment samples below the near-surface transition zone known as the "zone of maximum disturbance" is also important to avoid possible alteration effects and interference by recent organic matter. Geochemical analysis should include a full range of hydrocarbon types: light hydrocarbon gases (C1-C5), gasoline range (C5-C_(10+)), and high-molecular-weight (HMW) hydrocarbons (C_(15+)). The interstitial sediment gas data should be plotted on a total hydrocarbon gas (Σ C1-C5) versus wet gas fraction (Σ C2-C5/Σ C1-C5) chart to identify background, fractionated, and anomalous populations. Compound-specific isotopic analysis on selected anomalous samples is critical to correctly identify migrated subsurface gases from near-surface generated microbial gases. Microdesorption bound gases did not provide gas compositions or compound-specific isotope ratios similar to the Marco Polo reservoir gases, and thus, the bound gas extraction is not recommended. A gasoline range analysis provides a new range of hydrocarbons rarely examined in surface geochemical studies that assist in identifying thermogenic hydrocarbons. Extraction gas chromatography and total scanning fluorescence (TSF) maximum fluorescence intensity provided information on the presence of thermogenic HMW hydrocarbons but did not work as well with the low-level microseepage samples. The TSF fluorogram signature was similar for both seep and regional reference (background) samples and did not help to identify migrated thermogenic hydrocarbons. The Marco Polo calibration study provides a framework to better understand how best to collect (targeted deep cores) and extract migrated hydrocarbons from near-surface marine sediments and to evaluate the results.
机译：当前使用多种方法来收集，制备，提取和分析来自海洋沉积物中的近地表迁移的碳氢化合物，以评估地下石油的产生和圈闭。很少经过严格测试以评估其有效性。作为一项行业资助的研究项目的一部分，墨西哥湾对马可波罗油田进行了现场校准调查，以更好地了解先前已发表和未发表的海床地球化学结果，并确定哪种气体和液体碳氢化合物提取方法最能表征近地表层中迁移的碳氢化合物沉积物。 Marco Polo校准数据集证明了目标取芯和采样深度的重要性。为了改善对海床迁移的生烃的检测，应沿常规深地震和高分辨率海床成像确定的主要迁移途径（跨地层泄漏特征）收集岩心样品。并非所有目标内核都达到指定的功能，因此，沿关键迁移功能收集复制品至关重要。在近地表过渡带（称为“最大扰动区”）下方收集沉积物样品，对于避免可能的蚀变效应和近期有机物的干扰也很重要。地球化学分析应包括所有类型的烃：轻烃气体（C1-C5），汽油范围（C5-C_（10+））和高分子量（HMW）烃（C_（15+））。应在总烃气（ΣC1-C5）与湿气馏分（ΣC2-C5 /ΣC1-C5）图表上绘制间隙沉积物气体数据，以识别背景，分馏和异常种群。对选定的异常样品进行化合物特异性同位素分析对于正确识别近地表产生的微生物气体中迁移的地下气体至关重要。微脱附结合气体不能提供类似于马可波罗储层气体的气体组成或特定于化合物的同位素比，因此不建议萃取结合气体。汽油范围分析提供了在地表地球化学研究中很少检查的新范围的烃，可帮助识别热成烃。萃取气相色谱法和总扫描荧光（TSF）最大荧光强度提供了有关热源HMW碳氢化合物存在的信息，但不适用于低水平微渗漏样品。对于渗透和区域参考（本底）样品，TSF荧光图签名均相似，并且无助于识别迁移的生烃。 Marco Polo校准研究提供了一个框架，可以更好地了解如何最好地收集（针对深层岩心）和从近地表海洋沉积物中提取迁移的碳氢化合物并评估结果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号