VSP and Seismic Reflection Investigation of Fluid Flow and Structural Evolution at the Oregon Margin Accretionary Prism

会聚边缘增生棱柱体结构复杂 地质特征 这是一个提议， 俄勒冈州边缘OM-3站点的垂直地震剖面实验， 对钻孔3公里范围内的结构特征进行成像， 垂直和平行于结构走向。 这应该 从而更好地定义了正面推力及其关联， 以及部分原冲断层带。 因为VSP将在钻孔中使用 地面地震源，他们应该提供一个更好的联系， 地面地震资料 步入式VSP照亮了该区域 在井孔地震检波器下方，从而对下方的结构进行成像 并横向远离钻孔。 这种横向覆盖 将产生振幅与偏移信息， 用于推断锋面推力的流体含量和其他 显示异常振幅的层。 该奖项将支持摩尔博士的努力，以获得垂直 在俄勒冈州边缘钻井现场3（OM-3）的地震剖面（VSP）， 将在大洋钻探计划146航次上钻探。 这个实验将 提供了一个更全面的三维图片， 复杂的结构特征， 三公里半径的钻孔这将导致 更好地理解耦合的构造和水文地质 棱镜内的系统。VSP还允许直接比较 将地震信息与岩心材料和钻孔测井相结合 数据

Convergent margin accretionary prisms are structurally complex geological features. This is a proposal to conduct a walkaway Vertical Seismic Profile experiment at Oregon Margin site OM-3 to image the structural features within 3km of the borehole both perpendicular and parallel to structural strike. This should result in better definition of the frontal thrust and its associ- ated amplitude anomalies as well as part of the protothrust zone. Because the VSP's will be acquired in the drill hole using surface seismic sources, they should provide a better tie to surface seismic data. The walkaway VSP illumunates the zone below the borehole geophone, thereby imaging the structure below and laterally away from the drill hole. This lateral coverage will yield amplitude vs offset information, which will be used for inferring fluid contents of the frontal thrust and other layers that exhibit anomalous amplitudes. This award will support Dr. Moore's efforts to obtain Vertical Seismic Profiles (VSP) at the Oregon Margin drill site 3 (OM-3), which will be drilled on ODP Leg 146. This experiment will provide a more comprehensive three dimensional picture of the complex structural features of an accretionary prism within a three kilometer radius of the borehole. This will lead to a better understanding of the coupled structural and hydrogeologic system within the prism. VSP's will also allow direct comparison of seismic information to cored material and borehole logging data.