Determination of Physical Properties of Oceanic Sediments from ODP Wells Logs and their Relationship to Diagensis

根据这一建议，我们打算研究海底沉积物的物理性质及其与形成和演化过程的关系。这些沉积物的性质将主要通过在海洋钻探计划巡航期间钻探的井下进行测量而获得。如有可能，我们亦会在实验室直接量度钻探过程中所收集到的沉积物样本。这项建议涉及三项具体工作任务：1)分析在大洋钻探计划和之前的深海钻探项目期间收集的现有数据集，并在未来的大洋钻探计划巡航中收集更多数据。这些数据集将被分析，以获得沉积物的横波速度。2)改进了从全波形声波测井资料中求取沉积物横波速度的方法。这包括提高我们计算的速度和精度，更好的信号处理技术以减少数据中的噪音，以及改进声波在这些沉积物中传播的模型。3)只要有可能，就在实验室里研究这些沉积物。这些研究将包括在高功率扫描电子显微镜下检查样品以找出它们的结构和组成，直接测量横波速度和其他物理性质，将它们与在油井中进行的测量进行比较，检查这些数据如何与现有的关于这些沉积物的形成和演化的理论相吻合，如果有必要，发展关于这些过程的新理论。

Under this proposal, we intend to study the physical properties of ocean bottom sediments and their relationship to the processes by which they were formed and evolved. The properties of these sediments will be mostly obtained from measurements made down the wells drilled during cruises of the Ocean Drilling Program. If possible, we will also make direct laboratory measurements on any actual samples of these sediments recovered during drilling. This proposal involves three specific work tasks: 1) Analyze existing data sets collected during the Ocean Drilling Program and the previous Deep Sea Drilling Project and collect further data in future ODP cruises. These data sets will be analyzed to obtained the shear wave velocity of the sediments. 2) Refine our method of obtaining shear wave velocity of the sediments from the full waveform acoustic logging data collected. This involves increasing the speed and accuracy of our calculations, better signal processing techniques to reduce noise in the data, and improvements in the model of sound wave propagations in these sediments. 3) Study these sediments in the laboratory, whenever it is possible to do so. These studies will involve inspecting the samples under a high power Scanning Electron Microscope to find out their structure and composition, making direct measurements of shear wave velocity and other physical properties, comparing them to measurements made in the well, examining how these data fit into existing theories about the formation and evolution of these sediments, and, if necessary, developing new theory about these processes.