南科哈特盆地和前缘山脉的构造模型;对构造演化和油气开采的影响

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Nazir-ur- Rehman , Sajjad Ahmad , Shah Faisal , Shuja Ullah , Mumtaz Ali Khan , Fakhrul Islam
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引用次数: 0

摘要

最近,包括卡拉克地区在内的科哈特褶皱推覆带已成为喜马拉雅西部造山系统中一个重要的油气富集区。始新世和古新世地层,包括代表浅层解理的机械性弱始新世单元,对该地区的变形方式和石油系统做出了显著贡献。在本研究中,地表测绘与地震信息相结合,阐明了卡拉克地区的构造样式,数据显示有两个不同的构造实体,被卡拉克断层带分隔开来。北部区域描绘的是盐褶皱结构,表现为双重跌落和复杂的翻转,以及断层边界褶皱的几何形状。然而,在始新世层序以下的次表层,变形的特点是南向覆瓦状推力系统。与此相反,由于没有始新世盐层,卡拉克地区的南部区域呈现脆性变形风格,模仿断层扩展褶皱。此外,来自区域基底解理的南向覆岩系统阵列沿苏尔加尔山脉正面推力将二叠纪的岩石转化。可以看出,卡拉克断裂带北部和南部的断层几何形状和褶皱风格完全不同。整个地区恢复的断面图显示,该地区有 35% 的缩短。此外,本研究还得出结论,在卡拉克断裂带的北侧,可能在古新世洛克哈特层的顶部占据了有利的构造陷阱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural modeling of the southern Kohat Basin and Frontal Ranges; implications for tectonic evolution and hydrocarbon play

More recently Kohat's fold-thrust belt, including the Karak area has emerged as an important hydrocarbon fertile region of the western Himalayan orogenic system. The Eocene and Paleocene strata, including mechanical weak Eocene units representing a shallow decollement have a noticeable contribution to the deformation style and petroleum system of the area. In the present study, surface mapping is integrated with seismic information to elucidate the structural style of the Karak area, the data reveal that there are two different structural entities, separated by Karak Fault Zone. The northern domain portrays salt diapiric structures representing doubly plunging and complexity overturned, and fault bounded folds' geometries. However, in the subsurface below the Eocene sequence, the deformation is characterized by south-directed imbricate thrust system. In contrast, because of the absence of Eocene salt horizon, the southern domain of the Karak area illustrates a brittle style of deformation, mimicking fault propagation folding. In addition, an array of south-verging imbricate system from a regional basal decollement translates rock as old as Permian along the Surghar range frontal thrust. It can be observed that fault geometry and fold styles in the north and south of Karak Fault Zone are entirely different. Restored cross-sections across the area indicate 35% of shortening has been accommodated in the area. Moreover, from the present study it has been concluded that in the purlieu of Karak Fault Zone, possibly occupy auspicious structural traps at top Paleocene Lockhart level.

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来源期刊
Solid Earth Sciences
Solid Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
5.00%
发文量
20
审稿时长
103 days
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