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首页> 外文会议>Convention of the Gulf Coast Association of Geological Societies American Association of Petroleum Geologists Sectional Meeting;Meeting of the Gulf Coast Section of the Society of Economic Paleontologists and Mineralogists >Depositional Facies and Geometry of an Exposed Megaflap: Pennsylvanian Honaker Trail Formation, Gypsum Valley Salt Wall, Paradox Basin, Colorado
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Depositional Facies and Geometry of an Exposed Megaflap: Pennsylvanian Honaker Trail Formation, Gypsum Valley Salt Wall, Paradox Basin, Colorado

机译：暴露的封闭面和几何形状：宾夕法尼亚歌手Trail形成，石膏谷盐墙，悖论盆地，科罗拉多州

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Megaflaps are geometrically defined as steep-to-overturned, relatively-conformable, deep minibasin strata that extend long distances (several kilometers) up the margins of salt diapirs. The younger minibasin fill successively onlaps the megaflap, forming large-scale growth strata. Megaflaps have been penetrated during drilling in petroleum bearing salt basins (Gulf of Mexico and South Atlantic margins), due to misinterpretation of seismic along the poorly imaged salt-sediment interface. Pre-drill identification of megaflaps reduces the drilling hazards associated with encountering older, steeply-dipping strata, and impacts how trap, reservoir, and seal are risked. Therefore, the application of outcrop analogs that document the depositional facies, stratal geometries, and structural deformation of megaflaps is critical for successful pre-drill prediction and characterization of salt-flank traps. On the southwestern flank of the Gypsum Valley Salt Wall, Paradox Basin, Colorado, outcrop exposures of the Pennsylvanian Honaker Trail Formation provide a 2 km strike-oriented view of a megaflap. The near vertical panel comprises a thin, black shale interval of the upper Paradox Formation, and a 200 m section of cyclic shallow-marine carbonates and siliciclastics of the Honaker Trail Formation. Stratigraphic analysis of the lower Honaker Trail Formation, documents conglomerates with shallow marine carbonates above abrupt depositional contacts. Near-vertical, upper Paradox and Honaker Trail strata are onlapped by a 200 m thick transitional wedge of steeply-dipping (70?), Permian, lower Cutler Formation siliciclastics. This panel is onlapped by progressively lower-dip strata of the Jurassic Entrada Formation to form a large-scale onlap wedge. The megaflap and onlap wedge were subsequently beveled at an angular unconformity, overlain by the Jurassic Summerville and Morrison formations that form the overlap wedge. Laterally, the megaflap gradually shallows to 50-60? to the southeast before being abruptly terminated by a large down-dropped block, whereas younger minibasin fill progressively buries the megaflap to the northwest.
机译：Megaflaps是几何定义为陡峭的倾斜，相对符合的，深迷你酵母地层，延伸长距离（几公里）盐涂抹边缘。较年轻的迷你赛填充肉填充，形成大规模的生长阶层。由于沿着沉积物沉积物界面的误解，在石油轴承盐盆（墨西哥湾和南大西洋边缘的墨西哥湾）钻井期间，巨型在钻孔期间已经渗透。 Megaflaps的预钻取识别减少了与遇到较旧的，陡峭的地层相关的钻孔危险，并影响陷阱，水库和密封风险如何。因此，将记录沉积相，划分和结构变形的露出露节性类似物的应用对于成功预测和盐侧疏水阀的表征至关重要。在石膏谷盐墙的西南部侧翼，帕拉多盆地，科罗拉多州，宾夕法尼亚州荣誉的露天暴露，提供了2公里的兆普拉普的面向射击视图。近垂直面板包括薄，黑色页岩间隔的上悖论形成，以及200米的循环浅海碳酸酯和良性浅海碳酸盐的硅胶形成。较低兴奋剂地区的地层分析，浅船舶碳酸盐盐的剥离作用突然沉积触点。近垂直，上悖论和荣誉普通地层由200米厚的过渡性楔形陡峭浸渍（70？），二叠套，较低的粘结剂形成硅化性。本面板通过侏罗纪entrada地层的逐步降低地层展示，形成大规模的onlap楔形。随后将MegaFlap和Onlap楔形在角度不整合下倾斜，由侏罗纪雷维尔和形成重叠楔形的莫里森地层覆盖。横向，Megaflap逐渐浅到50-60？在突然终止的大型下降块之前到东南部，而年轻的米巴辛填补逐步将Megaflap派遣到西北部。

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