Mineral components of Lu211 well.

Ensuring the sustainability of energy is pivotal for achieving a harmonious balance between environmental conservation and economic growth. The mechanical behavior of deep shale reservoir rocks is intricate, presenting challenges in ascertaining their brittleness characteristics. To address this, the study employed a suite of evaluation techniques, encompassing analyses of stress-strain curve attributes, energy dissipation patterns, and mineral composition profiles. The overarching goal was to delineate the variations in deep shale brittleness as a function of depth. The findings indicate a general trend of decreasing shale brittleness with increasing depth. However, the brittleness indices derived from the three distinct evaluation methods varied, with the mineral composition approach yielding the most scattered results. This disparity underscores the heterogeneity of deep shale, likely due to its varied diagenetic history compared to shallower formations. In response to these observations, the study leveraged the principle of weighted averaging to devise a composite brittleness evaluation method. This innovative approach not only integrates the effects of multiple influencing factors but also accounts for the differential impact and weight of each method on the overall brittleness assessment. By doing so, it offers a more nuanced and holistic understanding of shale brittleness. The paper’s exploration of deep shale’s brittleness characteristics contributes valuable insights for the exploration and development of deep shale reservoirs, enhancing the strategic and operational frameworks within the energy sector. This comprehensive evaluation method serves as a foundation for more informed decision-making, ensuring that energy extraction is conducted in a manner that is both economically viable and environmentally responsible.

保障能源可持续性，对于实现环境保护与经济增长的和谐平衡至关重要。深层页岩储层岩石的力学行为复杂多变，为精准测定其脆性特征带来了挑战。为解决这一难题，本研究采用了一系列评价手段，涵盖应力-应变曲线（stress-strain curve）特征分析、能量耗散模式分析以及矿物组成分布特征分析，核心目标是阐明深层页岩脆性随埋藏深度的变化规律。研究结果显示，页岩脆性整体呈现随埋藏深度增加而降低的趋势，但三种不同评价方法得到的脆性指数存在差异，其中基于矿物组成的评价方法结果最为分散。这种差异凸显了深层页岩的非均质性，这可能是相较于浅层地层，其成岩演化历程更为复杂多样所致。针对上述观测结果，本研究借助加权平均原理构建了一种复合脆性评价方法，该创新方法不仅整合了多影响因素的作用，还考虑了各评价方法在整体脆性评价中的差异化影响与权重占比，能够更具细节性与整体性地揭示页岩脆性特征。本研究对深层页岩脆性特征的探索，为深层页岩储层的勘探开发提供了宝贵的理论参考，完善了能源领域的战略与作业框架；这套综合评价方法可为更科学的决策提供依据，保障能源开采在实现经济可行性的同时兼顾环境责任。