收敛斜滑移动带盆地的埋藏和热历史建模:俄克拉荷马州南部阿德莫尔盆地案例研究

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Ian A. Cox, Jack C. Pashin
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引用次数: 0

摘要

斜滑动带内沉积盆地的埋藏和热历史是独特和多方面的,其不规则的沉降期与压应力和剪应力密切相关。现代盆地建模技术可以制约构造事件和热历史的时间,并确定盆地沉降的速率和幅度,这反过来又有助于指导碳氢化合物的勘探。本文介绍的工作是俄克拉荷马州南部阿德摩尔盆地的首次现代盆地建模工作。该研究使用了 12 个一维埋藏史模型来评估晚泥盆世(法门期)-早密西西比世(图尔奈斯期)伍德福德页岩和早-晚密西西比世(图尔奈斯期-塞普霍维亚期)卡尼页岩碳氢化合物源岩的热成熟度。所有模型都显示了类似的构造演化过程,包括寒武纪伊阿佩坦断裂期间和之后的沉降、志留纪-晚密西西比被动边缘阶段的构造稳定、宾夕法尼亚同源沉降、二叠纪后同源沉降、二叠纪晚期-白垩纪早期的区域隆升和解顶,以及白垩纪早期-古近纪墨西哥湾盆地的沉降。宾夕法尼亚沉降似乎与威奇托隆起和阿巴克尔隆起的相继隆升同步,是对左侧大移位的反应。密西西比-二叠纪晚期的快速、高幅度下沉(>250 米/米年;盆地向斜中的 820 英尺/米年)表明,阿德摩尔盆地曾偶尔作为一个升降盆地,这是斜滑移动带沉积盆地的典型特征。泥盆纪-密西西比页岩段的热成熟度(玻璃光泽反射率,0.4-2.0% R)范围很广,与构造位置密切相关。等反射率线是近水平的,并与构造交叉,这表明了运动后的热成熟,其中隆起地层的热成熟度较低,而最深的切向地层的热成熟度较高。后构造模式是同步热成熟早期快速阶段的产物,被后构造热成熟的长期阶段所掩盖。基底热流的变化、构造历史以及烃源岩有机成分的普遍变化,尤其是在热成熟度较低的情况下,导致了玻璃光泽反射深度数据的适度分散。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Burial and thermal history modeling of basins in convergent oblique-slip mobile zones: A case study of the Ardmore Basin, southern Oklahoma

The burial and thermal history of sedimentary basins within oblique-slip mobile zones are unique and multifaceted, with irregular periods of subsidence that are closely related to compressional and shear stress. Modern basin modeling techniques can constrain the timing of tectonic events and thermal history as well as determine rates and magnitudes of basin subsidence, which in turn, helps guide exploration for hydrocarbons. The work presented here is the first modern basin modeling effort in the Ardmore Basin in southern Oklahoma. The study uses 12 one-dimensional burial history models to evaluate the thermal maturity of the Late Devonian (Famennian)–Early Mississippian (Tournaisian) Woodford Shale and the Early–Late Mississippian (Tournaisian–Serpukhovian) Caney Shale hydrocarbon source rocks. All models display a similar tectonic evolution with subsidence during and following Cambrian Iapetan rifting, tectonic stability during a Silurian–Late Mississippian passive margin phase, Pennsylvanian synorogenic subsidence, Permian post-orogenic subsidence, Late Permian–Early Cretaceous regional uplift and unroofing, and Early Cretaceous–Paleogene subsidence of the Gulf of Mexico Basin. Episodic Pennsylvanian subsidence appears to have been synchronous with sequential uplift of the Wichita Uplift and the Arbuckle Uplift in response to major left-lateral transpression. Rapid and high magnitude Late Mississippian–Permian subsidence (>250 m/m.y.; 820 ft/m.y. in basin synclines) suggests the Ardmore Basin functioned episodically as an elevator basin, which is typical of sedimentary basins in oblique-slip mobile zones. The Devonian–Mississippian shale section has a broad range of thermal maturity (vitrinite reflectance, 0.40–2.00% Ro), which is strongly dependent on structural position. Isoreflectance lines are subhorizontal and cross-cut structure, indicating post-kinematic thermal maturation in which strata are thermally immature in uplifts and thermally overmature in the deepest synclines. The post-kinematic pattern is a product of a rapid, early phase of synkinematic thermal maturation that has been obscured by a prolonged period of post-kinematic thermal maturation. Variations in basal heat flow, structural history, and general variability of hydrocarbon source rock organic composition, particularly at low thermal maturity levels, have resulted in a modest degree of scatter in the vitrinite reflectance-depth data.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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