Integrated core and log investigations for calibrating a mobile NMR scanner - with a special focus on the Gas Hydrate Leg 204

核磁共振技术在石油工业中应用广泛，是评价地层孔隙度和渗透率最合适的方法之一。最近，人们正在努力使核磁共振方法也适用于ODP和即将到来的IODP计划。一种移动核磁共振核磁共振仪目前正在开发中。建立一种快速、无损的常规岩石孔隙度测定方法，并对ODP岩心的孔径分布进行估计。最初的结果非常令人鼓舞，并表明需要加强岩石物理和地质研究。目的是测试核磁共振岩心扫描仪对ODP中常见岩石类型的适用性，特别是估计地层中的自由水和毛管束缚水。进一步的目标是评估该方法的精度和局限性，并用大量岩石物理数据集校准核磁共振结果。调查将集中在204号区块（水合物脊），该区块首次采用随钻测井（LWD）技术在ODP中进行核磁共振测井。所有钻井和测井作业都非常成功，提供了出色的岩心、电缆和邻近井眼的随钻测井数据。我们建议利用这一独特的机会对核磁共振岩心扫描仪和核磁共振测井数据进行比较研究。通过整合常规电缆数据和电井壁图像（RAB/FMS），最终可以在岩性、岩石物理和流体流动特性方面对沉积物进行详细描述。

NMR techniques are widely used in the oil industry and are one of the most suitable methods to evaluate in-situ formation porosity and permeability. Recently, efforts are directed towards adapting NMR methods also to ODP and the upcoming IODP program. A mobile NMR corescanner is presently under development... in order to establish a fast and nondestructive method to determine routinely rock porosity and to give estimate on the pore size distribution of ODP cores. First results are strongly encouraging and make evident the need for enhanced petrophysical and geological research. The objectives are to test the suitability of the NMR core scanner for rock types common in ODP, in particular to estimate the free and capillary bound water in the formation. Further goals are to evaluate the precision and the limits of the method and to calibrate the NMR results with a large collection of petrophysical data sets. Investigations will concentrate on Leg 204 (Hydrate Ridge), where NMR logging was performed in ODP for the first time by Logging-While-Drilling (LWD) technology. All drilling and logging operations were highly successful, providing excellent core, wireline, and LWD data from adjacent boreholes. We propose to use this unique opportunity for comparative studies between the NMR core scanner and the NMR logging data. By integrating conventional wireline data and electrical borehole wall images (RAB/FMS) this will end up in a detailed characterization of the sediments in terms of lithology, petrophysics and, fluid flow properties.