摘要
泥页岩非构造裂缝是泥页岩中常见的裂缝类型。非构造裂缝对页岩气成藏与保存评价具有重要意义。在前人研究成果基础上,考虑泥页岩本身固有的特性,初步提出泥页岩裂缝的分类方案,划分了非构造裂缝的类型,并总结各类非构造裂缝的形成机制。依据野外露头和岩心观察,描述了泥页岩非构造裂缝的特征。初步分析认为,在泥页岩非构造裂缝中,成岩层理裂缝、欠压实超压裂缝和生烃超压裂缝与页岩气成藏和保存关系密切。
Non-tectonic cracks are commonly observed in shale and some of them are greatly significant for the evaluation of shale gas accumulation and preservation. On the basis of the previous research and considering the inherent characteristics of shale,a category scheme of shale fractures has been put forward,and the forming mechanisms of the non-tectonic shale cracks has been summarized. According to the core and field observations,we briefly depicted the characteristics of the non-tectonic shale cracks. Among the non-tectonic cracks of shale,those bedding cracks formed in the diagenesis and those overpressure fractures induced by undercompaction or hydrocarbon generation have close relationship with shale gas accumulation and preservation.
出处
《现代地质》
CAS
CSCD
北大核心
2016年第1期155-162,共8页
Geoscience
基金
国家"973"计划项目(2012CB214806)
国家科技重大专项项目(2011ZX05005)
关键词
泥页岩
非构造裂缝
超压裂缝
欠压实
shale
non-tectonic crack
overpressure fracture
undercompaction
