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Oil-Base Borehole Image Applications in Thinly Bedded Sand Shale Sequences

机译：薄层砂页岩层序中的油基钻孔成像应用

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Micro-resistivity borehole image logs are well-establishedrntools of geologist and reservoir engineers. These data are usedrnfor detailed reservoir description, providing high-resolutionrnstructural and sedimentological data. For thinly laminatedrnturbidite sequences, they are often the only practical methodrnof determining the distribution of net pay thickness in thernabsence of whole core data. Additionally, micro-resistivityrnimages are used to help select intervals for formation testingrnand perforation.rnThe increasing use of oil and synthetic oil-base mud systemsrnto reduce drilling risks and improve drilling efficiency hasrncreated an environment that prohibited the use of conventionalrnmicro-resistivity imaging devices. Thus, it was imperative torndevelop a new micro-resistivity imaging technology for oilbasedrnmud systems. This paper summarizes the developmentrnand successful application of a new oil-base micro-resistivityrnimager (EARTH ImagerSM) that brings well-acceptedrnresolution and formation response characteristics ofrnconventional micro-resistivity imaging technology to the nonconductiverndrilling mud systems.rnCombining the EARTH Imager with advanced open-holernlogging instruments, such as the multi-component inductionrnlog (3D ExplorerSM), significantly improves petrophysicalrnevaluation of thinly bedded sand-shale sequences. Therninterpretation model is built on a combination of highresolutionrninformation from borehole image logs and the 3DrnExplorer horizontal and vertical resistivity data. These data arernused in the Laminated Shaly Sand Analysis (LSSASM)rnpetrophysical model to determine laminar sand resistivity,rnhydrocarbon saturation, and net sand pay. In our experience,rnsuch an approach provides a volumetrically balanced systemrnthat is highly reliable for predicting the production potential ofrnan exploration well, a critical step when allocating resourcesrnfor new development projects.
机译：微电阻率井眼图像测井是地质学家和储层工程师公认的工具。这些数据用于详细的储层描述，提供高分辨率的结构和沉积学数据。对于薄层状浊积岩层序，它们通常是唯一的实用方法，它可以在缺乏整个岩心数据的情况下确定净产层厚度的分布。另外，使用微电阻率图像来帮助选择地层测试和射孔的间隔。越来越多地使用石油和合成油基泥浆系统来降低钻井风险并提高钻井效率，造成了禁止使用常规微电阻率成像设备的环境。因此，迫切需要为油基泥浆系统开发一种新的微电阻率成像技术。本文总结了一种新型的油基微电阻率成像仪（EARTH ImagerSM）的开发和成功应用，它将常规的微电阻率成像技术的分辨率和地层响应特征带入了非导电性钻井泥浆系统。诸如多组分感应测井仪（3D ExplorerSM）之类的仪器可以显着改善薄层砂页岩层序的岩石物理评价。该解释模型是基于井眼图像测井的高分辨率信息与3DrnExplorer水平和垂直电阻率数据的组合而建立的。这些数据被用于层状泥质砂岩分析（LSSASM）岩石物理模型中，以确定层状砂岩的电阻率，碳氢化合物饱和度和净含砂量。根据我们的经验，这种方法提供了一个体积均衡的系统，对于预测探井的生产潜力是高度可靠的，这是为新的开发项目分配资源的关键步骤。

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