L103 Officer Basin seismic survey, WA, 1972

Current geological surface mapping of the Officer Basin, W.A., by BMR has given an incomplete picture because the area is largely covered by flat-lying Permian fluvioglacials or lateritized Cretaceous rocks and the outcrops give no indication of the structure and composition of the sediments in most of the basin. The geological boundaries within the basin and at its margins are ill-defined, and the only reliable shallowsubsurface information available from geophysical and well data is along the northern part of the basin near Warburton Mission. A seismic survey in the Officer BaSin, W.A., is planned to operate from mid-July to December 19720 The survey is to be conducted along a NE-SW line roughly following the road between Lake Throssell and Warburton Mission at the two margins of the basin. It will consist of a series of combined refraction and reflection probes located along the road. The operations will start with two probes near the centre of the basin, and the location of subsequent probes will depend on the progressive assessment of results. The results will be tied to those from the earlier seismic surveys in the northern part of the basin.澳大利亚矿产资源局（Bureau of Mineral Resources, BMR）针对西澳大利亚州（Western Australia, W.A.）奥非尔盆地（Officer Basin）开展的现行地表地质填图成果并不完整。究其原因，该区域大部分被平缓产出的二叠纪冰水沉积岩或经红土化改造的白垩纪岩石覆盖，且盆地绝大多数区域的露头无法反映沉积层的构造与组分特征。盆地内部及周缘的地质边界界定模糊，目前仅能通过地球物理与钻井数据获取盆地北部靠近沃伯顿传教站（Warburton Mission）区域的可靠浅地下信息。针对西澳大利亚州奥非尔盆地的地震勘探计划于1972年7月中旬至12月开展，本次勘探将沿北东-南西（NE-SW）向测线布设，大致沿连接特罗斯尔湖（Lake Throssell）与沃伯顿传教站的公路展开，覆盖盆地的两处周缘区域。本次勘探将沿公路布设一系列折射与反射联合探测测点，作业将以盆地中心附近的两处测点作为起始，后续测点的布设位置将根据勘探成果的逐步评估结果确定，所得数据将与盆地北部此前开展的地震勘探数据进行关联对比。