Offshore Northern Perth Basin Well Folio

The well folio package contains the combined data of 23 offshore wells in the northern Perth Basin, including the first published synthesis of data from fourteen new field wildcat wells drilled in this part of the basin since the Cliff Head 1 discovery (2001). Completed as part of the Australian Government's Offshore Energy Security Program, the well folio package will improve the assessment of petroleum prospectivity in the offshore Perth Basin. The well folio package consists of 23 composite well log plots, six well to well correlations and a new chronostratigraphic sequence framework and includes Geoscience Australia's revised Offshore Perth Basin Biozonation and Stratigraphy 2011 Chart 38 (Jones et al., 2011a). The well folio package summarises key stratigraphic, biostratigraphic and geochemical data and sequence interpretations for wells in the offshore northern Perth Basin from the Beagle and Turtle Dove ridges, Houtman and central Abrolhos sub-basins and the Wittecarra Terrace. Composite well log plots at 1:5000 scale summarise, in graphic form, the main stratigraphic features and hydrocarbon occurrences. The composite well logs also graphically summarise results from 120 new palynological samples and 244 new Rock-Eval pyrolysis/Total Organic Carbon (TOC), 85 new Vitrinite Reflectance (VR), 14 new FAMM maturity and compiled Grains with Oil Inclusions (GOITM) measurements. Compilations of new and open-file biostratigraphic and geochemical data are also included in digital spreadsheet formats. Data from the 23 offshore wells show that the main sedimentary succession in the offshore northern Perth Basin is Permian to Late Jurassic in age: two wells intersected a sandstone section of Late Cambrian to Early Ordovician age. Reviewed open-file biostratigraphic data, new biostratigraphic data and interpretations from these samples have been used in conjunction with well logs and lithological interpretations of cuttings, cores and side wall cores to define a new chronostratigraphic sequence framework for this part of the basin. Sequences and major maximum flooding surfaces are correlated between wells to show the spatial and temporal distribution of these sequences through the offshore northern Perth Basin.本井组合订资料包涵盖珀斯盆地北部海域23口海上钻井的整合数据，其中包含自2001年克利夫黑德1号（Cliff Head 1）油气发现以来，该盆地该区域内14口新钻探的野外初探井（wildcat well）数据的首次公开合成成果。本井组合订资料包作为澳大利亚政府海上能源安全计划（Offshore Energy Security Program）的组成部分完成编制，将助力提升珀斯盆地海域油气远景潜力的评估精度。该资料包包含23幅综合测井曲线图、6幅井间对比图以及一套全新的年代地层格架，同时收录了澳大利亚地球科学局（Geoscience Australia）修订的《2011年珀斯盆地海域生物地层与地层学图表38》（Jones等，2011a）。 本井组合订资料包汇总了珀斯盆地北部海域比格尔海岭（Beagle Ridge）与斑鸠海岭（Turtle Dove Ridge）、豪特曼次盆地与阿布洛霍斯中部次盆地以及威特卡拉阶地（Wittecarra Terrace）内各钻井的关键地层学、生物地层学与地球化学数据，以及层序解译成果。比例为1:5000的综合测井曲线图以图形化形式汇总了主要地层特征与油气产出情况。此外，该综合测井图还以可视化方式呈现了120件全新孢粉样品（palynological samples）的分析结果，以及244组全新Rock-Eval热解/总有机碳（Total Organic Carbon, TOC）、85组全新镜质体反射率（Vitrinite Reflectance, VR）、14组全新FAMM成熟度测试数据，以及整合后的含油包裹体颗粒（Grains with Oil Inclusions, GOITM）测量结果。资料包还以电子表格格式收录了全新及公开档案的生物地层与地球化学数据汇编。 基于这23口海上钻井的数据可知，珀斯盆地北部海域的主要沉积层序形成于二叠纪至晚侏罗世期间，其中2口钻井钻遇了晚寒武世至早奥陶世时期的砂岩地层。经梳理的公开档案生物地层数据、全新生物地层数据及上述样品的解译结果，结合测井资料以及岩屑、岩心与井壁取心的岩性解译，被用于构建该盆地该区域的全新年代地层格架。通过井间对比各层序与主要最大海泛面，可明确这些层序在珀斯盆地北部海域的时空分布规律。