Petrophysically determined lithofacies at the Nankai Trough Accretionary Prism: NanTroSEIZE, IODP Expedition 314

Petrophysically determined lithofacies at the Nankai Trough Accretionary Prism: NanTroSEIZE, IODP Expedition 314
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南海海槽增生棱柱岩石物理确定的岩相:NanTroSEIZE,IODP Expedition 314

DOI:
10.1144/0016-76492008-136
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发表时间:
2009
影响因子:
2.7
通讯作者:
Tudge J
Tudge J
中科院分区:
地球科学2区
文献类型:
--
作者:
Tudge J

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描述活跃增生棱柱的物理性质和确定边界对于了解它们的行为和最近的运动是必要的。在这种不稳定的条件下,岩心回收并不总是可靠的,特别是在断层带附近。综合大洋钻探计划(IODP)314号探险队是南海海槽地震带实验(NanTroSEIZE)的第一阶段,采用随钻测井(LWD)技术记录连续的物性数据。我们使用迭代非层次聚类分析(印加),以定量地确定在站点C0001和C0004的斜坡沉积物和沉积物内的增生棱柱体的特征。一个新的和详细的基于测井的岩石地层学的发展,和主要边界的位置,确定三维地震剖面和测井响应的初步解释,细化。结果产生的集群,清楚地区分斜坡沉积物和特征的增生棱镜内的地层。识别了与斜坡沉积物和增生棱柱体之间的地震定义的不整合相关的边界,以及与以前通过测井分析和钻孔图像未解决的巨型断层相对应的增生棱柱体内的边界。我们的研究表明,印加分析随钻测井数据可以准确地确定边界和表征沉积物的环境中,岩心回收可能是不完整的。
Characterizing the physical properties and identifying boundaries within active accretionary prisms is necessary in understanding their behaviour and recent movement. In such unstable conditions core recovery is not always reliable, especially around fault zones. Integrated Ocean Drilling Program (IODP) Expedition 314 was the first stage of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), and used logging-while-drilling (LWD) technology to record continuous physical property data. We use iterative non-hierarchical cluster analysis (INCA) to quantitatively define the characteristics of the slope sediments and sediments within the accretionary prism at Sites C0001 and C0004. A new and detailed log-based lithostratigraphy is developed, and positions of major boundaries, defined by 3D seismic profiles and initial interpretation of log responses, are refined. The results produce clusters that clearly distinguish the slope sediments and characterize formations within the accretionary prism. Boundaries that correlate to the seismic-defined unconformity between the slope sediments and the accretionary prism, and a boundary within the accretionary prism that corresponds to a megasplay fault previously unresolved by log analysis and borehole images, are identified. Our study demonstrates that INCA analysis of LWD data can accurately define boundaries and characterize sediments in environments where core recovery may be incomplete.
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