石英类型对早期银河纪龙马西页岩的机械参数的影响,四川盆地
Qin Zhang1,2, Feng Liang3,4, Qun Zhao3,4
1PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China. zhangqin2169@petrochina.com.cn.
Scientific reports
|December 2, 2024
概括
了解页岩碎裂性需要了解石英的起源. 在LM1-LM3区的生物质石英 (BQ) 增强了水力压裂,而破碎石英 (DQ) 和粘土转化石英 (CTQ) 对机械性能的影响不同. 最佳裂变发生在特定的石英比率下.
科学领域:
- 地质学和地质化学
- 石油工程是石油工程中的一个.
- 材料科学 材料科学 材料科学
背景情况:
- 页岩气库的易碎性与石英含量有关,石英是页岩中的一个关键矿物质.
- 石英生物原 (BQ),碎石 (DQ) 和粘土转化 (CTQ) 的不同来源以及它们对水库性质的特定影响尚未完全理解.
- 研究这些石英类型对于优化页岩气勘探中的水力压裂至关重要.
研究的目的:
- 分析龙马西页岩中不同类型的石英的遗传机制.
- 量化评估BQ,DQ和CTQ在各种石墨矿石区域的分布.
- 为了确定每个石英类型对页岩水库的机械性能和易碎性的影响.
主要方法:
- 对有机地质化学,矿物成分和主要/微量元素的系统分析.
- 阴极光发光观测,以区分石英的起源.
- 页岩机械参数的日志解释和计算 (斯模量,波桑比率,脆性指数).
主要成果:
- 生物质石英 (BQ) 主导着LM1-LM3区 (平均) 的生物质石英. 65.7%),而破碎石英 (DQ) 在LM4-LM5和LM6-LM8区域 (平均值) 更为丰富. 38.7%和34.9%) 的情况.
- BQ含量与Poisson比率下降和脆性指数 (BI) 增加相关,有利于裂变.
- DQ和CTQ含量与Poisson比率的增加和BI的降低相关,从而对可碎性产生负面影响. 在LM1-LM3页岩中,Young的模量最高,Poisson的比率最低,非常适合用于水力压裂.
结论:
- 石英的类型和来源在很大程度上控制了页岩水库的机械性能和易碎性.
- 富含生物质石英的LM1-LM3石灰岩区为水力压裂提供了最有利的条件.
- 最佳的石英含量 (52%-85%) 与特定的DQ与BQ比率提高了骨折的发展和刺激的有效性.
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