Offshore Otway and Gippsland Basin geochemistry : research curise proposal

During April/ May 1988 the Bureau of Mineral Resources will conduct a 22 day geochemical research programme in the Otway and Gippsland Basins. This programme follows previous preliminary studies (January-February 1987) which examined the distribution and molecular composition of light hydrocarbon gases within deep water surficial sediments in the Otway Basin.The major thrust of the forthcoming cruise will be to obtain shallow water (continental shelf) geochemical data from both the Otway and Gippsland Basins, to test ideas generated from the previous programme, and, inparticular, to integrate the results with in house BMR geohistory and maturation modelling studies. The objectives are, therefore:
1.To develop new information on source rocks, maturation, and hydrocarbon migration on the Mussel and Crayfish Platforms and Voluta Trough in the Otway Basin.
2.Specifically, to test the relationship between variations in sourcerock maturation (as indicated by well data and geohistory analyses) andthe surface hydrocarbon gas composition and distribution within sediments from the Otway and Gippsland Basins.
The majority of the programme will be focussed on the Otway Basin, with the final 4-5 days of the cruise spent in the Gippsland Basin. Sampling will becarried out along previously shot BMR multi-channel seismic lines, and will consist of vibracoring in shallow water (

1988年4月至5月期间，矿产资源局（Bureau of Mineral Resources，BMR）将在奥特韦盆地（Otway Basin）与吉普斯兰盆地（Gippsland Basins）开展为期22天的地球化学研究计划。本计划承接1987年1—2月开展的前期预研究，彼时研究针对奥特韦盆地深水表层沉积物内轻烃气体的分布与分子组成展开了考察。
本次即将实施的航次核心目标为：采集奥特韦与吉普斯兰盆地浅水区（大陆架）的地球化学数据，以验证前期研究提出的相关假说，尤为关键的是，将本次研究结果与BMR内部开展的盆地地质历史演化与成熟度模拟研究进行整合。据此，本次研究的目标如下：
1. 针对奥特韦盆地内的贻贝与小龙虾平台（Mussel and Crayfish Platforms）及沃尔塔海槽（Voluta Trough），获取有关烃源岩、成熟度及烃类运移的全新研究数据。
2. 具体而言，验证烃源岩成熟度差异（以测井数据与地质历史演化分析为表征依据）与奥特韦、吉普斯兰盆地沉积物表层烃类气体组成及分布之间的关联关系。
本次研究的主体工作将集中于奥特韦盆地，航次最后4至5天将在吉普斯兰盆地开展。采样工作将沿此前BMR采集的多道地震测线进行，采样方式包含浅水区振动柱状取样（vibracoring）。