百色盆地那坤地区那读组淡水灰岩储层裂缝成因分析
Genesis of freshwater limestone of Paleogene Nadu Formation in Nakun area, Baise Basin
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摘要: 提要：以岩心描述为基础，结合声发射实验和碳氧同位素、包裹体成因类型及均一温度分析成果，对那坤地区那读组淡水灰岩储层裂缝特征和裂缝成因进行了深入研究。研究结果表明：那坤地区那读组淡水灰岩储层主要发育有垂直裂缝、高角度裂缝和斜交裂缝；裂缝主要有构造裂缝与非构造裂缝两类，构造裂缝有追踪叠加成岩压裂斜缝发育形成复合裂缝；裂缝部分被方解石完全充填或半充填,部分未被充填而呈开启状；裂缝发育受到3次不同构造应力场作用的影响；构造裂缝对改造和改善储层孔渗性具有重要的贡献。Abstract: Abstract： On the basis of core observation,the authors studied the features and genesis of freshwater limestone by acoustic emission technology, stable isotopic analysis, fluid inclusion homogenization temperature of filled components in fractures. The results show that the main fractures of the freshwater limestone reservoir are of three types： vertical fissures, high-angle fissures, and oblique fissures. The tectoclase and non-tectoclase constitute two main fissure types. The complex fracture can be formed by tectoclase overlying diagenetic fractures. Some fissures are completely or partly filled with calcite, whereas others are effective fractures without fillings. The development and evolution of fractures have been affected considerably by three different tectonic stress fields. The tectoclase has exerted important contribution to improving porosity and permeability of the reservoir.
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Keywords:
- fractures /
- freshwater limestone /
- Baise Basin /
- acoustic emission
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