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首页> 外文会议>Submarine mass movements and their consequences >MTCs of the Brazos-Trinity Slope System; Thoughts on the Sequence Stratigraphy of MTCs and Their Possible Roles in Shaping Hydrocarbon Traps
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MTCs of the Brazos-Trinity Slope System; Thoughts on the Sequence Stratigraphy of MTCs and Their Possible Roles in Shaping Hydrocarbon Traps

机译：Brazos-Trinity斜坡系统的MTC；对MTCs层序地层学及其在油气圈闭形成中可能作用的思考

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Mass Transport Complexes (MTCs) are significant constituents of the fill of the basins of the Brazos-Trinity Slope System. These MTCs are composite stratigraphic bodies consisting of resedimented materials associated with slumps, slides, debris flows, but also subordinate turbidites, and hemipelagites. Although their composition is variable, they tend to be mud-rich. The MTCs exhibit a variety of external geometries. They commonly have erosive bases characterized by "boxy", grooved scours and mounded tops. Commonly, they are internally chaotic, but sometimes show crude stratification or fabrics related to patterns of movement and/ or deformation. Because of increased awareness of the abundance of MTCs within deep marine settings and their association with other well known architectural elements, recent attempts have been made to incorporate the occurrence of MTCs into predictive sequence stratigraphic models. The models emphasize the role of relative sea level cycles in the generation of MTCs and relate this to formative processes and positions within an idealized depositional sequence. However, while some Brazos-Trinity MTCs may conform to these concepts, others do not. As such, utility of MTCs for developing sequence stratigraphic frameworks for the Brazos-Trinity system is dubious. Based on our understanding of the Brazos-Trinity Slope System it is proposed that MTCs play a role in shaping hyrdrocarbon traps in analogous subsurface systems. Although some portions of these MTCs contain sufficient porous and permeable sediment to constitute hydrocarbon reservoirs, most represent seal and "waste rock" units. They can form basal, vertical and lateral seals to reservoir complexes, as well as intra-reservoir seals and baffles. Because of their erosive nature, the emplacement of MTCs has often resulted in localized or widespread termination of reservoir strata. MTCs with clay-rich lithologies form low permeability, high capillary entry pressure layers overlying these erosional surfaces. Thus, the geometry and transmissibility of contacts between MTCs and reservoir-bearing strata can
机译：大众运输综合体（MTC）是Brazos-Trinity斜坡系统盆地充填的重要组成部分。这些MTC是复合地层体，由沉积的物质组成，这些物质与塌陷，滑坡，泥石流以及下层的浊质和半铁矿有关。尽管它们的组成是可变的，但它们往往富含泥浆。 MTC具有多种外部几何形状。它们通常具有侵蚀性的基底，其特征在于“四角形”，开槽的冲刷和堆积的顶部。通常，它们内部混乱，但有时会显示出粗糙的分层或与运动和/或变形模式有关的织物。由于人们对深海环境中MTC的丰富性及其与其他知名建筑元素的关联的认识不断提高，因此最近进行了尝试将MTC的发生纳入预测层序地层学模型。这些模型强调了相对海平面周期在MTC产生中的作用，并将其与理想沉积序列中的形成过程和位置联系起来。但是，尽管某些Brazos-Trinity MTC可能符合这些概念，但另一些则不符合。因此，MTC在为Brazos-Trinity系统开发层序地层框架方面的效用值得怀疑。根据我们对Brazos-Trinity斜坡系统的理解，建议MTC在类似地下系统中的碳氢化合物捕集阱成型中发挥作用。尽管这些MTC的某些部分包含足够的多孔和可渗透沉积物以构成碳氢化合物储层，但大多数代表了封闭和“废石”单元。它们可以形成储层群的基础，垂直和侧向海豹，以及储层内海豹和挡板。由于它们具有侵蚀性，MTC的定位常常导致储层的局部或广泛终止。具有富粘土岩性的MTC形成覆盖这些侵蚀面的低渗透率，高毛细管进入压力层。因此，MTC和储层之间的接触的几何形状和可传递性可以

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