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The elongated and sinuous mud volcanoes and their seismic expression (Gulf of Cadiz SW of Spain)

机译：细长和蜿蜒的泥浆火山及其地震表达（西班牙Cadiz Sw的湾）

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The Miocene Gulf of Cadiz basin, located offshore in SW Spain, can be geologically divided in two main areas: the eastern area, characterized by the presence of olistostromic masses indented amongst the Miocene sediments, and the western area, free of olistostromes, and where biogenic gas is produced from Messinian turbiditic sands. Exploration in the western part has been made since the 80's searching for bright spots supported by amplitude versus offset (AVO) class III anomalies, with a success ratio of an 80%.In the late 90's the revision in the eastern part of the old 2D seismic led to the interpretation of the possible presence of isolated Messinian turbiditic channels. This new play for the SE area revived the interest for this under explored sub-basin (with only two wells drilled until the year 1982 with no sand reservoirs and numerous gas shows), and a 3D seismic was shot with the idea to use AVO anomalies as indicative of the presence of gas charged sands. After the first new exploratory well, this work will show how misleading was this idea, since the interpreted Messinian channels sands turned out to be narrow, elongated and sinuous mud volcanoes emerging from the over pressured olistostrome.
机译：Cadiz盆地的内科湾位于SW西班牙的海上，可以在地质上分为两个主要区域：东部地区，其特征在于在内科沉积物中抑制的糖瘤群体，以及不含奥斯科斯的西部地区，以及在哪里生物气体由Messinian Tymiditic Sands生产。自80年代寻找幅度与偏移（AVO）III类异常（AVO）III类异常支持的明亮点，成功比例为80％以来，已经制造了西部勘探。在90年代后期，在旧的2D东部的修订版中的修订版地震导致了解释可能存在的孤立的Messinian浊音渠道。这种新的SE地区的戏剧恢复了探索的子盆地的利益（只有两个井，直到1982年，没有砂水库和众多的天然气节目），并且使用AVO异常的想法射杀了3D地震表示气体带电砂的存在。在第一个新的探索性井之后，这项工作将展示这种想法的误导如何，因为解释的Messinian渠道沙子原来是狭窄的，细长和蜿蜒的泥浆火山，从而从过度加压的橄榄球菌中出现。

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