(Table T1) Porosity and permeability of samples from ODP Leg 180 sites@en

Woodlark Basin, an area of continental extension, is an ideal location to study the evolution of permeability and the development of overpressures within an active rift basin. In this investigation, we measured sediment permeabilities of cores from Woodlark Basin and used numerical modeling to determine if pore fluid overpressures are likely at the base of the rift basin. Constant-rate flow tests were conducted on cores from Site 1108, located in the rift basin, and Sites 1115 and 1118, located on the northern margin of the basin. Results of the laboratory tests indicated permeabilities that range from 1.5 x 10**-18 to 1 x 10**-16 m**2. Results of the numerical modeling of Site 1108 suggest that overpressures due to sedimentation are unlikely.

作为大陆伸展型构造区域，伍德拉克海盆（Woodlark Basin）是研究主动裂谷盆地内渗透率演化与孔隙流体超压发育过程的理想研究区域。本研究通过实测伍德拉克海盆沉积物岩芯的渗透率，并结合数值模拟方法，判断该裂谷盆地底部是否存在孔隙流体超压。研究团队对位于裂谷盆地内的1108站位，以及位于海盆北缘的1115、1118站位的岩芯开展了定流量流试验（Constant-rate flow test）。实验室测试结果显示，沉积物渗透率范围为1.5×10⁻¹⁸ 至 1×10⁻¹⁶ 平方米（m²）。针对1108站位的数值模拟结果表明，由沉积作用引发的孔隙流体超压并不存在。