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首页> 外文期刊>Journal of South American earth sciences >Fault kinematics and depocenter evolution of oil-bearing, continental successions of the Mina del Carmen Formation (Albian) in the Golfo San Jorge basin, Argentina
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Fault kinematics and depocenter evolution of oil-bearing, continental successions of the Mina del Carmen Formation (Albian) in the Golfo San Jorge basin, Argentina

机译：阿根廷戈尔福-圣豪尔赫盆地米纳德尔卡门组（阿尔比亚）含油大陆陆演的断层运动学和沉积中心演化

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Up to 10% of the liquid hydrocarbons of the Golfo San Jorge basin come from the Mina del Carmen Formation (Albian), an ash-dominated fluvial succession preserved in a variably integrated channel network that evolved coeval to an extensional tectonic event, poorly analyzed up to date. Fault orientation, throw distribution and kinematics of fault populations affecting the Mina del Carmen Formation were investigated using a 3D seismic dataset in the Cerro Dragon field (Eastern Sector of the Golfo San Jorge basin). Thickness maps of the seismic sub-units that integrate the Mina del Carmen Formation, named MEC-A-MEC-C in ascending order, and mapping of fluvial channels performed applying geophysical tools of visualization were integrated to the kinematical analysis of 20 main normal faults of the field. The study provides examples of changes in fault throw patterns with time, associated with faults of different orientations. The "main synrift phase" is characterized by NE-SW striking (mean Az = 49°), basement-involved normal faults that attains its maximum throw on top of the volcanic basement; this set of faults was active during deposition of the Las Heras Group and Pozo D-129 formation. A "second synrift phase" is recognized by E-W striking normal faults (mean Az = 91°) that nucleated and propagated from the Albian Mina del Carmen Formation. Fault activity was localized during deposition of the MEC-A sub-unit, but generalized during deposition of MEC-B sub-unit, producing centripetal and partially isolated depocenters. Upward decreasing in fault activity is inferred by more gradual thickness variation of MEC-C and the overlying Lower Member of Bajo Barreal Formation, evidencing passive infilling of relief associated to fault boundaries, and conformation of wider depocenters with well integrated networks of channels of larger dimensions but random orientation. Lately, the Mina del Carmen Formation was affected by the downward propagation of E-W to ESE-WNW striking normal faults (mean Az = 98°) formed during the "third rifting phase", which occurs coeval with the deposition of the Upper Member of the Bajo Barreal Formation. The fault characteristics indicate a counterclockwise rotation of the stress field during the deposition of the Chubut Group of the Golfo San Jorge basin, likely associated to the rotation of Southern South America during the fragmentation of the Gondwana paleocontinent. Understanding the evolution of fault-controlled topography in continental basins allow to infer location and orientation of coeval fluvial systems, providing a more reliable scenario for location of producing oil wells.
机译：戈尔福圣豪尔赫盆地最多10％的液态碳氢化合物来自Mina del Carmen组（Albian），这是一种以灰烬为主的河流相演替体，保存在一个可变的整合通道网络中，演变成同时代的到一个扩展的构造事件，分析不力。至今。使用3D地震数据集，在塞罗·龙场（戈尔福·圣豪尔赫盆地的东部），研究了影响米纳德尔卡门组的断层取向，断层分布和运动学。将结合Mina del Carmen组的地震子单元的厚度图（按升序排列）命名为MEC-A-MEC-C，并使用可视化地球物理工具进行的河道测绘，被整合到20个主要正断层的运动学分析中领域的。该研究提供了与不同方向的断层相关的断层投掷模式随时间变化的示例。 “主要同生期”的特征是NE-SW撞击（平均Az = 49°），基底相关的正断层，该断层在火山基底上达到最大倾角。这组断层在Las Heras组沉积和Pozo D-129形成期间活跃。 E-W撞击从Albian Mina del Carmen组中成核并传播的正常​​断层（平均Az = 91°）可识别出“第二次同相期”。断层活动在MEC-A子单元沉积过程中局部化，但在MEC-B子单元沉积过程中普遍化，产生向心和部分孤立的沉积中心。 MEC-C和上覆的Bajo Barreal组下段的厚度逐渐变化，断层活动的向上下降是由与断层边界相关的地层的被动充填，以及较宽的沉积中心与大尺寸通道的良好集成网络相一致而推断的。但方向随机。最近，Mina del Carmen组受到EW向ESE-WNW的向下传播的影响，这是在“第三裂谷期”形成的正断层（平均Az = 98°），与断层上段的沉积同时发生。 Bajo Barreal编队。断层特征表明，在戈尔福-圣豪尔赫盆地的丘布特群沉积期间，应力场逆时针旋转，这可能与冈瓦纳古大陆碎裂期间南美洲南部的旋转有关。了解大陆盆地断层控制地貌的演变，可以推断出河流相河流系统的位置和方向，从而为生产油井的位置提供了更可靠的方案。

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