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首页> 外文期刊>Energy Exploration & Exploitation >Brittleness evaluation of the Upper Ordovician Wufeng-Lower Silurian Longmaxi shale in Southern Sichuan Basin, China
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Brittleness evaluation of the Upper Ordovician Wufeng-Lower Silurian Longmaxi shale in Southern Sichuan Basin, China

机译：四川盆地南部上奥陶统五峰组-下志留统龙马溪组页岩脆性评价

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Rock brittleness is now one of the significant parameters for geological evaluation of shale gas reservoirs due to the wide application of hydraulic fracturing in shale gas development. Currently, the evaluation of shale brittleness is generally based on mineral composition or elastic parameters, which both derive from the exploration experiences in North America. Due to the easier access of mineral composition data through x-ray diffraction method than rock mechanical data through array sonic logging method, the mineral-based brittleness indices have stronger practicability. However, there is not a unified definition of brittle minerals yet, which now usually refers to quartz or quartz and carbonate minerals. Considering the specific conditions of Wufeng-Longmaxi Formation in Southern Sichuan Basin; depositional environment of calcareous shelf; and higher content of calcite, dolomite, and pyrite, we redefined brittle minerals according to the elastic parameters of each mineral, taking quartz, dolomite, and pyrite which best satisfy the standard of "Young's modulus> 30 GPa and Poisson's ratio<0.25'' as brittle minerals to establish a new brittleness index, which was proved to be more accurate and applicable than the current mineral-based brittleness indices. Then we applied the new evaluation model to Well W201, and selected "sweet spot'' intervals combining with lithology, total organic carbon (TOC), thickness, and other geological parameters. The results showed that the "sweet spot'' interval of this well is the black siliceous shale developed in Rhuddanian-middle Aeronian stage with an average brittleness index of 50.66%, TOC of 2.3-6.2%, and total thickness of about 19 m.
机译：由于水力压裂在页岩气开发中的广泛应用，岩石脆性现在已成为页岩气储层地质评价的重要参数之一。目前，对页岩脆性的评估通常基于矿物成分或弹性参数，这两者均源于北美的勘探经验。由于通过X射线衍射法比通过阵列声波测井法更容易获得岩石成分数据，因此基于矿物的脆性指数具有更强的实用性。但是，脆性矿物尚无统一定义，现在通常指石英或石英和碳酸盐矿物。考虑四川盆地南部五峰-龙马溪组的特殊条件；钙质层架的沉积环境；在方解石，白云石和黄铁矿含量较高的情况下，我们根据每种矿物的弹性参数重新定义了脆性矿物，采用最符合“杨氏模量> 30 GPa和泊松比<0.25”标准的石英，白云石和黄铁矿。作为脆性矿物，建立了新的脆性指数，事实证明该脆性指数比目前基于矿物的脆性指数更准确，更适用，然后将新的评估模型应用于W201井，并结合岩性选择“最佳”区间，总有机碳（TOC），厚度和其他地质参数。结果表明，该井的“最佳点”区间是在Rhuddanian-Aeronian阶段发育的黑色硅质页岩，平均脆性指数为50.66％，TOC为2.3-6.2％，总厚度约为19 m。

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