Core-log-seismic integration in hard rock environments using the ICDP drilling project COSC-1, Sweden

本研究将详细调查的地质结构和岩石物理性质的斯堪的纳维亚加里东山脉的ICDP项目碰撞造山作用在斯堪的纳维亚加里东山脉（COSC）的框架内。其目标是获得新的见解关键造山过程，如推覆体侵位，并建立一个合理的基础比较加里东与现代类似物，如喜马拉雅山。本提案的主要目标是通过岩心-测井-地震综合法（CLSI），在COSC场地及附近区域构建Seve推覆体的高分辨率地震地层学。这将使识别独特的岩石物理特征的谢夫推覆复杂的变质序列，并导致其演变的更好的理解。此外，这些信息将外推到一个大规模的模型，使用现有的高分辨率和VSP校准的二维和三维地震成像。地下的准确表征不仅需要反射地震分析，而且还需要高分辨率岩石物理岩心和地球物理测井数据集的整合。为了实现这一目标，一个有用的合并和交叉校准的核心，井下测井和地震数据是强制性的，以揭示新的配置和演化的主要剪切带（据说转化为糜棱岩）之间的推覆体。我们的建议侧重于使用基于CLSI的跨学科方法对岩石的地质和岩石物理性质进行调查。我们将综合岩心测量、测井数据和地震数据，这些数据在各自的测量尺度上具有不同的分辨率。CLSI方法已成功应用于海洋和湖泊环境以及许多IODP钻井项目。在该提案中，该技术将首次应用于硬岩，这将需要开发新的方法，CLSI结晶基底。之所以选择COSC项目，是因为可以获得出色的地震数据、井下测井和VSP数据，而且不同的实验室目前正在对大量岩心样品进行几项岩石物理测量;所有研究这些数据的科学家都同意参与或支持这项工作。

This study will investigate in detail the geological structure and the petrophysical properties of the Scandinavian Caledonides within the framework of the ICDP project Collisional Orogeny in the Scandinavian Caledonides (COSC). The goal is to gain new insights into critical orogenic processes, such as nappe emplacement, and to establish a justified base for the comparison of the Caledonides with modern analogues, e.g. the Himalayas. The key objective of this proposal is to construct a high-resolution seismic stratigraphy of the Seve Nappe Complex at the COSC site and nearby areas by core-log-seismic integration (CLSI). This will allow identification of distinctive petrophysical characteristics of the metamorphic sequence of the Seve Nappe Complex and lead to an improved understanding of its evolution. Furthermore, this information will be extrapolated to a large scale model, using already existing high-resolution and VSP calibrated 2D and 3D seismic imaging. Accurate characterization of the subsurface requires not only reflection seismic analysis but also integration of high-resolution petrophysical drill core and geophysical well-log data sets. To reach this goal, a useful merging and cross calibration of core, downhole logging and seismic data is mandatory to shed new light on the configuration and evolution of the primary shear zones (supposedly transformed into mylonites) between nappes. Our proposal focuses on investigations of the geo- and petrophysical properties of the rock using an interdisciplinary approach based on CLSI. We will integrate core measurements, logging data and seismic data, which are of different resolution in the respective measurement scales. The CLSI method has been successfully applied in marine and lake environments and in many IODP drilling projects. In this proposal, the techniques will be applied to hard rock for the first time, which will require the development of new approaches of CLSI to crystalline basement. The COSC project has been chosen because excellent seismic data, downhole logging and VSP data are available and several petrophysical measurements are currently being performed by different labs on a large set of core samples; all scientists working on these data have agreed to be involved or support this work.