Phosphatic series under Plio-Quaternary cover of Tadla Plain, Morocco: Gravity and seismic data

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2019-08-01 DOI:10.1016/j.crte.2019.05.002
Nadia El Kiram , Mohammed Jaffal , Azzouz Kchikach , Driss El Azzab , Mustapha El Ghorfi , Oussama Khadiri , Es-Said Jourani , Ahmed Manar , Mohamed Nahim
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引用次数: 7

Abstract

The Ouled Abdoun sedimentary basin in Morocco contains the largest phosphate reserves in the world. To the Northwest of the basin, the phosphate layers crop out or are at a shallow depth and are exploited in open pit mines. By contrast, towards the central and southwestern parts of the basin, the phosphate layers lay below the Plio-Quaternary sediments of the Tadla Plain. This study aims to characterize the distribution and structure of the phosphatic series at depth under this cover, in particular to guide the future exploration and exploitation of the phosphate deposits. The work is based on gravimetric and seismic data acquired in a previous oil exploration study, calibrated by borehole data. The analysis of the gravity data controlled by boreholes first reveals the existence of large regional faults in the basin, forming pronounced gradients in the gravity data. The faults are also seen in the seismic profiles. In the Southeast of the basin, the phosphatic series exhibit a stairway structure controlled by some of these regional faults.

The drilling data and the isochron maps established from the seismic profiles show that the base of the phosphatic series is more than 500 m deep in the southeastern area of the basin. As the phosphatic layers get buried deeper, they also become thicker. The phosphate reserves thus increase towards the southeast, and our analysis identifies the areas where this reserve is larger. Our results eventually suggest that the mining methods currently adopted in the Khouribga mining district will need to be modified and adapted to the more complex situation of the phosphatic series deeply buried in the basin.

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摩洛哥塔德拉平原上第四纪盖层下的磷系:重力和地震资料
摩洛哥的Ouled abdown沉积盆地蕴藏着世界上最大的磷酸盐储量。在盆地西北部,磷矿层突出或浅埋,在露天矿中开采。相比之下,在盆地的中部和西南部,磷酸盐层位于塔德拉平原的上第四纪沉积物之下。本研究旨在对该盖层下深层磷矿系的分布和构造进行表征,以指导今后磷矿床的勘探和开发。这项工作是基于先前石油勘探研究中获得的重力和地震数据,并通过井眼数据进行校准。通过钻孔控制的重力资料分析,首先发现盆地内存在较大的区域性断裂,在重力资料上形成明显的梯度。在地震剖面上也可以看到断层。在盆地东南部,受部分区域断裂控制的含磷系呈阶梯状构造。钻井资料和地震剖面等时线图显示,盆地东南部的磷化系基底深度超过500 m。随着磷酸盐层埋得更深,它们也变得更厚。因此,磷酸盐储量向东南方向增加,我们的分析确定了储量较大的区域。我们的研究结果最终表明,Khouribga矿区目前采用的采矿方法需要进行改进和适应,以适应盆地深埋磷系的更复杂情况。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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