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首页> 外文期刊>AAPG Bulletin >Paleocene to Eocene deep-water slope canyons, western Gulf of Mexico: Further insights for the provenance of deep-water offshore Wilcox Group plays
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Paleocene to Eocene deep-water slope canyons, western Gulf of Mexico: Further insights for the provenance of deep-water offshore Wilcox Group plays

机译：墨西哥湾西部的古新世至始新世深水斜坡峡谷：深水近海威尔科克斯集团（Wilcox Group）的物产来源的进一步见解

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摘要

In the Gulf of Mexico (GOM), an extensive deep-water fan system of the lower Tertiary Wilcox Group forms a significant exploration target, yet connections to equivalent-aged onshore fluvial, deltaic, and shallow-marine reservoirs are poorly documented. Using a large, three-dimensional (3-D) seismic survey (3300 mi~2, 8500 km~2), we examined the lower Tertiary structure and stratigraphy of the underexplored Texas coastal zone, approximately 60 mi (96 km) downdip of the paleoshelf edge and 200 mi (322 km) updip of the deep-water discoveries. Canyons are identified throughout the inferred Paleocene to upper Eocene interval near Matagorda Bay, with this study focusing on the youngest. These are typically 2-2.5 mi (3-4 km) wide and 600-1600 ft (200-500 m) deep. Main incisional axes trend downslope, and some bifurcate. Early salt movement appears to have created an irregular paleoslope topography and an altered slope gradient, thereby influencing de-positional flow pathways. In a paleogeographic context, this canyon complex is interpreted to lie in a middle- to lower-slope setting and sits directly downdip of the Wilcox Group shelf-margin canyon systems. Although not all of the canyons necessarily connect updip to the shelf-edge canyons, or down-dip to fan systems, they represent part of a large-scale complex along this western GOM margin that acted as a conduit to the successfully drilled, deep-water, lower Tertiary Wilcox turbidite play. These results have importance not only for the prospectivity of the Texas shelf but also for the regional understanding of the Paleocene through lower Eocene paleoge-ography of the GOM.
机译：在墨西哥湾（GOM），较低的第三纪威尔克克斯集团的广泛深水扇系统构成了重要的勘探目标，但与同等年龄的陆上河流，三角洲和浅海水库的联系却鲜有记载。我们使用大型三维（3-D）地震勘测（3300 mi〜2，8500 km〜2），研究了得克萨斯州沿海沿岸下倾约60英里（96公里）的低第三纪构造和地层。古陆缘和深水发现的200英里（322公里）上升。在整个推断的古新世至玛塔哥达湾附近的始新世区间中都发现了峡谷，这项研究的重点是最小的。它们的宽度通常为2-2.5英里（3-4公里），深度为600-1600英尺（200-500 m）。主切轴趋于下坡，有些则分叉。早期的盐运动似乎造成了不规则的古斜坡形貌和改变的坡度梯度，从而影响了沉积流路。在古地理背景下，该峡谷群被解释为处于中低坡度环境中，并直接位于Wilcox Group陆缘峡谷系统的下倾角。尽管并非所有峡谷都一定会将上倾角连接到大陆架边缘峡谷，或将下倾角连接到风扇系统，但它们代表了西部GOM边缘的大型综合体的一部分，可作为通向成功钻探的深层峡谷的通道水，打下第三纪的Wilcox浊石。这些结果不仅对于得克萨斯大陆架的前景具有重要意义，而且对于通过古有机质的较低始新世古地理学对古新世的区域理解也具有重要意义。

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