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Seismic Signature Analysis for Clarification of Mud Volcanoes from the New Mud Diapirs Discovered at the NE-SW Moroccan Atlantic Margin

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Open Journal of Geology 2022年第11期12卷 973-982页

作者： Asher Hategekamungu nadia mhammdi Amine Manar Mohamed Department of Earth Sciences Scientific Institute Laboratory LGRN and GEOPAC research Centre University Mohammed V in Rabat Av. Ibn Batouta Agdal Rabat Morocco Department of Petroleum Exploration Direction and South Offshore Office National des Hydrocarbures et des Mines (ONHYM) Rabat Morocco

Our aim is to clarify mud volcanoes from the new mud diapirs resulting from the seismic attributes analysis applied to the low resolution Burmah oil “1973-1974” seismic data. The latter was carried out on the Larache and Tanger-Larache offshores from the NE-SW Atlantic margin. The high resolution seismic data was essential for this evaluation. In this case, we applied seismic signature analysis to four seismic profiles from the map of the seismic data set, which includes all new mud diapirs. This helped us to classify different types of mud diapirs within the seismic profiles. And as a result, six deep mud diapirs from the Prerifaine Nappe of Morocco, a shallow mud diapir, and four seafloor-piercing mud diapirs have been observed. Furthermore, the seafloor-piercing mud diapirs show a mushroom-shaped and conical-shaped cone. As they break through the seafloor, these kinds of cones characterize mud volcanoes. In this case, we may conclude that the resultant seafloor-piercing mud diapirs are likely to be mud volcanoes. However, more geological sampling and seafloor observation are still required.

关键词： Seismic Signature Analysis Clarification Mud Volcanoes Discovered Mud Diapirs NW-SW Moroccan Margin

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A Seismic Facies Analysis to Determine the Relative Age and History of the Al Idrissi Mud Volcano from Offshore Larache Located in the NW Moroccan Atlantic Margin

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Open Journal of Geology 2023年第3期13卷 203-220页

作者： Asher Hategekamungu nadia mhammdi Mohamed Amine Manar Asmae Bernachid Geophysics and Natural Hazards Laboratory GEOPAC Research Centre Scientific Institute Mohammed V University in Rabat Rabat Morocco Department of Petroleum Exploration Direction and South Offshore Office National des Hydrocarbures et des Mines (ONHYM) Rabat Morocco

Formed on top of the Gulf of Cadiz, the Al Idrissi mud volcano is the shallowest and largest mud volcano in the El Arraiche mud volcano field of the northwestern Moroccan margin. The development and morphology of mud volcanoes from the El Arraiche mud volcanoes group have been studied at a large scale. However, the time interval related to their formation period still needs to be better understood. In this regard, we interpreted and analyzed the seismic facies from the 2D reflection data of the GEOMARGEN-1 campaign, which took place in 2011. The aim was to identify the seismic sequences and draw the Al Idrissi mud volcano system to determine the formation period of the Al Idriss mud volcano. And as a result, the Al Idrissi mud volcano system is made of both buried and superficial bicone and was identified along with the Upper Tortonian to Messinian-Upper Pliocene facies. As the initial mud volcano extrusive edifice, the buried bicone was formed in the Late-Messinian to Early-Pliocene period. However, the superficial bicone, as the final extrusive edifice, was included in the Late Pliocene. In this case, the timing interval between the buried and superficial bicone is equivalent to the Late-Messinian to Upper-Pliocene period. Therefore, the latter corresponds to the Al Idrissi mud volcano formation period.

关键词： Northwestern Moroccan Margin Al Idrissi Mud Volcano 2D Reflection Data from the GEOMARGEN-1 Campaign Seismic Signatures Analysis Formation Period

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