Abstract

The Dezful Embayment, in the southwest of the Zagros orogenic belt, contains anticlines that have different geometries in vertical and horizontal sections. One of these anticlines is the NW–SE trending Bibi-Hakimeh anticline, with a length of 71 km and a width of 5 to 8 km. In this research, using the interpretation of six reflection seismic sections, well data and surface outcrops we have investigated the percentage of shortening and changes in the structural geometry of the Bibi-Hakimeh anticline in the Dezful Embayment (southwest of Iran). The interpreted seismic lines show the presence of the forethrust and backthrust in the forelimb and backlimb of this anticline. In the Bibi-Hakimeh anticline, a relatively large thickness of the Gachsaran Formation is observed at limbs, and a small thickness is observed in the hinge zone of the anticline. The movement of this Formation from the top of the anticline towards the limbs has caused to be the lowest thickness of the Gachsaran Formation in the hinge zone of the anticline. Asymmetric and disharmonic geometry of the Bibi-Hakimeh anticline is due to the forethrusts and backthrusts and the presence of the Gachsaran Formation as detachment level. The lowest percentage of shortening is related to the SE part of this anticline is ~10.44% and the highest percentage of shortening is related to its middle part is ~12.41%.

中文翻译：

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Gachsaran 蒸发地层对褶皱结构样式的影响：Bibi-Hakimeh 背斜，Zagros 带（伊朗）

摘要

扎格罗斯造山带西南部的 Dezful Embayment 包含在垂直和水平剖面上具有不同几何形状的背斜。其中一个背斜是 NW-SE 走向的 Bibi-Hakimeh 背斜，长 71 公里，宽 5 至 8 公里。在这项研究中，通过对六个反射地震剖面、井数据和地表露头的解释，我们研究了 Dezful Embayment（伊朗西南部）Bibi-Hakimeh 背斜的结构几何形状的缩短百分比和变化。解释的地震线显示该背斜的前肢和后肢存在前冲和反冲。在 Bibi-Hakimeh 背斜中，Gachsaran 组在四肢处厚度较大，在背斜铰链区厚度较小。该组从背斜顶部向四肢的移动导致了背斜铰链区 Gachsaran 组的最低厚度。Bibi-Hakimeh 背斜的不对称和不和谐几何形状是由于前冲和反冲以及 Gachsaran 组作为分离层的存在。与该背斜的 SE 部分相关的缩短百分比最低约为 10.44%，与其中间部分相关的缩短百分比最高约为 12.41%。Bibi-Hakimeh 背斜的不对称和不和谐几何形状是由于前冲和反冲以及 Gachsaran 组作为分离层的存在。与该背斜的 SE 部分相关的缩短百分比最低约为 10.44%，与其中间部分相关的缩短百分比最高约为 12.41%。Bibi-Hakimeh 背斜的不对称和不和谐几何形状是由于前冲和反冲以及 Gachsaran 组作为分离层的存在。与该背斜的 SE 部分相关的缩短百分比最低约为 10.44%，与其中间部分相关的缩短百分比最高约为 12.41%。