L013 Poole Range-Price's Creek seismic survey, WA, 1953

The 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. The survey 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 notcertain. 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 tbe north-eastern side of the Pinracle Fault, ard 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 defree of conformity between shallow and deep reflections on the northern flank of the dome. Further investigation 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 roeks on tbe northeastern side of the Pinnacle fault are shown to have a probable unexposed thickness of about 900 feet.

本次地震勘探覆盖菲茨罗伊盆地（Fitzroy Basin）东北边界附近的普尔岭（Poole Range）、普赖斯溪（Price's Creek）区域以及平纳克尔断层（Pinnacle Fault）。本次勘探于1953年冬季开展。普尔岭穹窿（Poole Range Dome）已在二叠纪（Permian）露头岩石中完成地质填图，但其西翼构造闭合状态尚不明确。该穹窿属于一条背斜褶皱带的东南端点，该褶皱带还涵盖圣乔治岭穹窿（St. George Range Dome）与内里马穹窿（Nerrima Dome）。本次石油试钻井的目标层位应为泥盆纪（Devonian）和/或奥陶纪（Ordovician）地层，上述地层在平纳克尔断层东北侧出露，而普尔岭的二叠纪地层被认为以不整合接触关系覆于该套地层之上。地震勘探结果显示，平纳克尔断层西南侧存在巨厚沉积地层；同时该穹窿北翼的浅层与深层地震反射波呈现出较好的一致性。1954年，研究人员围绕该穹窿的翼部开展了进一步勘探，以查明该穹窿构造在深部是否持续存在，但1954年勘探成果的解释工作尚未完成。平纳克尔断层东北侧的奥陶纪地层，其未出露厚度推测约为900英尺。