The Permian Basin of the southwestern United States has produced approximately 35 billion bbl of conventional oil over the past century, and until recently, it was broadly viewed as an overdeveloped basin in the twilight of its effective life. Over the past decade, however, this perspective has changed because of the extraordinary success in oil recovery from unconventional upper Paleozoic shale reservoirs that are forecast to more than double the recovered oil from the Permian Basin. Among the assortment of shale reservoirs is the Upper Pennsylvanian Cline shale (also known as Wolfcamp D) of the southern Midland Basin that has oil-in-place estimates as high as 30–35 billion bbl and recoverable oil estimates for individual wells in the hundreds of thousands of barrels. The Cline shale extends across an approximately 10,000 mi2 (∼25,000 km2) fairway and is composed of eight basin-floor depositional facies that are variably enriched in organic matter, detrital clay, and calcite, all important attributes that influence reservoir quality and oil recovery. Gamma-ray and density logs are commonly available in wells throughout the Midland Basin and have a diagnostic response to sedimentary attributes that allows the grouping of eight lithofacies identified in core into six log-defined petrofacies. The correlation and mapping of petrofacies across the southern Midland Basin demonstrate a close correlation between the distribution of the most organically enriched petrofacies (organic-rich shale) and the burgeoning fairway of successful horizontal drilling and oil production.

中文翻译：

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德克萨斯州米德兰盆地宾夕法尼亚后期克林页岩（也称为Wolfcamp D）内富含有机质储层相的预测

在过去的一个世纪中，美国西南部的二叠纪盆地已生产了大约350亿桶常规石油，直到最近，由于其有效寿命，人们普遍认为它是一个过度开发的盆地。然而，在过去的十年中，由于非常规上古生界页岩储层在采油方面取得了巨大成功，因此这一观点发生了变化，据预测，该储层已从二叠纪盆地采出的石油量增加了一倍以上。页岩油藏中有南部米德兰盆地的宾夕法尼亚上克林页岩页岩（也称为沃尔夫坎普D），其现场采油量估计高达30-350亿桶，数百口井的可采油量估计值几千桶 Cline页岩的延伸范围约为10,000平方英里（约25英里，000 km2）航道，由八个盆地-底下沉积相组成，这些相中富含有机质，碎屑粘土和方解石，这些都是影响储层质量和采油率的重要属性。伽玛射线测井仪和密度测井仪通常在整个中部盆地的井中都能获得，并且对沉积属性具有诊断响应，可以将岩心中确定的8个岩相分组为6个测井定义的岩相。整个米德兰盆地南部的岩相的相关性和制图表明，最有机富集的岩相（富含有机物的页岩）的分布与成功的水平钻井和石油生产的新兴航道之间有着密切的相关性。碎屑粘土和方解石都是影响储层质量和采油率的所有重要属性。伽玛射线测井仪和密度测井仪通常在整个中部盆地的井中都能获得，并且对沉积属性具有诊断响应，可以将岩心中确定的8个岩相分组为6个测井定义的岩相。整个米德兰盆地南部的岩相的相关性和制图表明，最有机富集的岩相（富含有机物的页岩）的分布与成功的水平钻井和石油生产的新兴航道之间有着密切的相关性。碎屑粘土和方解石都是影响储层质量和采油率的所有重要属性。伽玛射线测井仪和密度测井仪通常在整个中部盆地的井中都能获得，并且对沉积属性具有诊断响应，可以将岩心中确定的8个岩相分组为6个测井定义的岩相。整个米德兰盆地南部的岩相的相关性和制图表明，最有机富集的岩相（富含有机物的页岩）的分布与成功的水平钻井和石油生产的新兴航道之间有着密切的相关性。伽玛射线测井仪和密度测井仪通常在整个中部盆地的井中都能获得，并且对沉积属性具有诊断响应，可以将岩心中确定的8个岩相分组为6个测井定义的岩相。整个米德兰盆地南部的岩相的相关性和制图表明，最有机富集的岩相（富含有机物的页岩）的分布与成功的水平钻井和石油生产的新兴航道之间有着密切的相关性。伽玛射线测井仪和密度测井仪通常在整个中部盆地的井中都能获得，并且对沉积属性具有诊断响应，可以将岩心中确定的8个岩相分组为6个测井定义的岩相。整个米德兰盆地南部的岩相的相关性和制图表明，最有机富集的岩相（富含有机物的页岩）的分布与成功的水平钻井和石油生产的新兴航道之间有着密切的相关性。