Processing and interpretation of lower crustal seismic events from recently released industry data to study the influence of deep rooted processes on formation and evolution of the North German Basin and their relation to neo-tectonic activities

对最近发布的行业数据中的下地壳地震事件进行处理和解释，以研究深部过程对北德盆地形成和演化的影响及其与新构造活动的关系

• 批准号: 5429049
• 负责人: Professor Dr. Dirk Gajewski
• 金额: --
• 依托单位: Institut für Geophysik (IfG)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5429049?language=en
• 关键词: Processing; interpretation; lower; crustal; seismic

The Schleswig-Holstein area of the Central European Basin System qualifies as an outstanding "natural geo-scientific laboratory" in terms of the geological inventory the available database and with regard to its key role in basin evolution. An extensive database was gathered by the Oil- and Gas Industry. Essential parts of this data base became available for research within the SPP 1135. The acquisition and processing by the industry of the released reflection seismic data was tuned to image the basin sediments down to the Zechstein using basically standard CMP processing which was state of the art in the 80ies. Several of the industry profiles were acquired using long offsets (up to 4.8 km) and long recording times (up to 14 sec TWT). The potential of the data to image the crystalline crust was never optimised and only marginally exploited although structures in the lower crust and partly also some Moho reflections were already visible in the (for the lower crust) brute CMP stacks. Since the structure of the crystalline crust provides important information on the deep processes steering and influencing basin formation we want to exploit the imaging potential of the industry data for the lower crust using contemporary imaging methods like the Common Reflection Surface (CRS) stack and modern pre-stack depth migration techniques as well as migration velocity analysis. Moho depth, Moho releif, Moho diversity and possible metamorphic complexes and their effects on siesmic signatures are some of the key issues do be investigated. Moreover, seismic events within the crystalline crust as well as fault zones and their possible surface extensions are further topics to be discussed. Among others, the new images will help to elucidate how seismic signatures relate to crustal blocks and its tectonic lineaments and how lower crustal structures are leated to gravimetric and magnetic anomalies. They will further provide insight whether there is evidence for Avalonia and of Proterozoic sediments and whether the Moho is related to the 700°C isotherm.

中欧海盆系统的石勒苏益格-荷尔斯泰因地区在地质调查、现有数据库以及在海盆演变中的关键作用方面，堪称杰出的“自然地球科学实验室”。石油和天然气工业收集了一个广泛的数据库。该数据库的基本部分可用于SPP 1135内的研究。工业界对所释放的反射地震数据的采集和处理进行了调整，以使用基本上标准的CMP处理对盆地沉积物进行成像，直到Zechstein，这在80年代是最先进的。几个行业概况是使用长偏移距（高达4.8公里）和长记录时间（高达14秒行波管）获得的。虽然下地壳的结构和部分莫霍面反射在（下地壳）原始CMP堆栈中已经可见，但数据对结晶地壳成像的潜力从未得到优化，仅得到少量利用。由于结晶地壳的结构提供了指导和影响盆地形成的深部过程的重要信息，我们希望利用当代成像方法，如共反射面（CRS）叠加和现代叠前深度偏移技术以及偏移速度分析，开发下地壳工业数据的成像潜力。莫霍面深度、莫霍面丰度、莫霍面多样性和可能的变质杂岩及其对地震特征的影响是研究的重点。此外，结晶地壳内的地震事件以及断裂带及其可能的表面延伸是有待讨论的进一步主题。除其他外，新图像将有助于阐明地震特征如何与地壳块体及其构造线性构造相关，以及下地壳结构如何影响重力和磁力异常。他们将进一步提供关于阿瓦隆尼亚和元古代沉积物的证据，以及莫霍面是否与700°C等温线有关的见解。