X-ray fluorescence (XRF) data from a series of high-pressure–high-temperature (HPHT) wells drilled in the Shearwater Field, UK Continental Shelf (UKCS) are presented. These data comprise a total of 789 samples across a series of eight study wells. Chemical stratigraphy was utilized in conjunction with other geological data (i.e. well logs, ditch cutting descriptions and biostratigraphic analyses) to aid real-time stratigraphic placement. Systematic changes in geochemical composition were identified and used to build a chemostratigraphic zonation to aid delineation of lithostratigraphic boundaries. The application of chemical stratigraphy provided a valuable source of data, particularly through critical ‘drill-in-liner’ sections that are devoid of conventional logging while drilling (LWD) data. The identification of key geochemical zones and provision of a synthetic gamma-ray (Synth GR) profile were utilized in the placement of key casing points and identification of challenging top reservoir picks (Fulmar Formation). These data also served as a backup during LWD tool failure resulting from excessive temperatures. The successive addition of geochemical data accumulated with each well-site exercise permitted continued refinement of the zonation framework, with derived Synth GR profiles exhibiting an extremely close relationship with subsequent wireline logs. Chemical stratigraphic data are shown to be robust and repeatable within the Shearwater Field, enabling close stratigraphic control through critical sections, whilst also providing a low-cost backup in the event of conventional logging tool failures.

中文翻译：

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实时化学地层学在支持 HPHT 井安全钻井中的应用：来自英国北海中部 Shearwater 油田的示例

展示了在英国大陆架 (UKCS) 的 Shearwater 油田钻探的一系列高压-高温 (HPHT) 井的 X 射线荧光 (XRF) 数据。这些数据包括一系列八个研究井中的总共 789 个样品。化学地层学与其他地质数据（即测井记录、沟渠切割描述和生物地层分析）结合使用，以帮助实时地层定位。地球化学成分的系统变化被确定并用于建立化学地层分区，以帮助划定岩石地层边界。化学地层学的应用提供了宝贵的数据来源，特别是通过缺乏常规随钻测井 (LWD) 数据的关键“衬管钻孔”部分。关键地球化学带的识别和合成伽马射线 (Synth GR) 剖面的提供被用于关键套管点的放置和具有挑战性的顶部储层采摘（Fulmar 组）的识别。在因温度过高导致 LWD 工具故障期间，这些数据还用作备份。每次井场演习积累的地球化学数据的连续添加允许继续改进分区框架，衍生的 Synth GR 剖面与随后的电缆测井显示出极其密切的关系。化学地层数据在 Shearwater 油田中表现出稳健和可重复的特性，能够通过关键部分进行紧密的地层控制，同时还可以在常规测井工具发生故障时提供低成本备份。