L010 seismic survey of the Poole Range-Price's Creek area, WA, 1953

A seismic survey extending over the Poole Range and Price's Creek areas and the Pinnacle Fault, near the north-eastern boundary of the Fitzroy Basin was corducted during the winter of 1953.The Poole Range Dome has been mapped in outcropping rocks of Permian age, but its western closure is not certain. It is at the south-eastern end of a line of anticlinal folding which includes the St. George Range Dome and Nerrima Dome.The target beds for an oil test bore would be the Devonian and/or Ordovician rocks, which crop out on the north-eastern side of the Pinracle Fault, and over which the Permian rocks of the Poole Range are believed to lie unconformably.The seismic results indicate a thick section of sediments on the south-western side of the Pinnacle Fault and show a fair degree of conformity between shallow and deep reflections on the northern flank of the dome. Further investigatioll was made in 1954 around the flanks of the dome to determine whether or not the domal structure persists at depth, but the interpretation of the results of the 1954 survey is not yet complete. The Ordovician rocks on tbe north-eastern side of the Pinnacle fault are shown to have a probable unexposed thickness of about 900 feet.

1953年冬季，在菲茨罗伊盆地（Fitzroy Basin）东北边界附近，针对普尔山脉（Poole Range）、普赖斯溪（Price's Creek）区域及尖峰断层（Pinnacle Fault）开展了一项地震勘探工作。普尔山脉穹窿（Poole Range Dome）已在二叠纪（Permian）露头岩石中完成地质填图，但其西翼闭合状态尚不明确。该穹窿属于涵盖圣乔治山脉穹窿（St. George Range Dome）与内里马穹窿（Nerrima Dome）的背斜褶皱带的东南端。本次石油试验井的目标层位应为发育于尖峰断层东北侧的泥盆系（Devonian）和/或奥陶系（Ordovician）岩石，而普尔山脉的二叠系地层被认为不整合覆盖于该套地层之上。地震勘探结果显示，尖峰断层西南侧存在巨厚沉积地层，同时在该穹窿北翼，浅层与深层地震反射同相轴呈现出较好的一致性。1954年，研究团队围绕该穹窿侧翼开展了进一步勘探工作，以探明该穹窿构造在深部是否依然存在，但1954年勘探数据的解释工作尚未完成。尖峰断层东北侧的奥陶系地层，其推测隐伏未出露厚度约为900英尺。