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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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泥页岩裂缝发育特征及其对页岩气勘探和开发的影响
Keywords: 泥页岩,裂缝,发育特征,地质因素,孔渗性,页岩气,勘探开发
Abstract:
？裂缝既可为页岩气提供聚集空间，也可为页岩气的生产提供运移通道。泥页岩作为一种低孔低渗储层，页岩气生产机制非常复杂，涉及吸附气含量与游离气含量、天然微裂缝与压裂诱导缝系统之间的相互关系。对泥页岩裂缝的成因类型、识别特征、基本参数(宽度/张开度、长度、间距、密度、产状、充填情况、溶蚀改造情况等)、孔渗性、地质控制因素及其对页岩气聚集和产出的影响进行了研究。泥页岩中主要存在5种裂缝，即构造缝(张性缝和剪性缝)、层间页理缝、层面滑移缝、成岩收缩微裂缝和有机质演化异常压力缝;控制裂缝形成的地质因素复杂，主要有区域构造应力、构造部位、沉积成岩作用、岩性、岩相、物性及地层压力等;裂缝识别特征及成因机制各不相同，其对页岩气的吸附和解析以及渗流性响应所起的作用也不相同。页岩气有利勘探目标区应首选那些拥有较高渗透能力或具备可改造条件的泥页岩裂缝发育带。
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