收稿日期: 2010-12-25
修回日期: 2011-02-27
网络出版日期: 2011-06-10
基金资助
国家自然科学基金项目“页岩气聚集机理与成藏条件”(编号：40672087);国家专项“全国油气资源战略选区调查与评价”(编号：2009GYXQ-15)联合资助.
Feature of Muddy Shale Fissure and Its Effect for Shale Gas Exploration and Development
Received date: 2010-12-25
Revised date: 2011-02-27
Online published: 2011-06-10
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。
龙鹏宇, 张金川, 唐玄, 聂海宽, 刘珠江, 韩双彪, 朱亮亮 . 泥页岩裂缝发育特征及其对页岩气勘探和开发的影响[J]. 天然气地球科学, 2011 , 22(3) : 525 -532 . DOI: 10.11764/j.issn.1672-1926.2011.03.525
Fissure can be provided not only for shale gas accumulation space,but also for migration pathway of gas production.As a kind of low permeability and low porosity reservoir,mechanism of shale gas production is complicated,involving the relationship between adsorbed gas content and free gas content,natural tiny fissure and fracturing induced fissure.We discuss type of muddy shale fissure,identification,basic parameters (width/opening,length,spacing,density,strike and dip,filling,dissolution reconstruction,etc.),poroperm characteristics,geologic background,and the effects on accumulation and production of shale gas.There are five kinds of fissure in the muddy shale,including structural fractures (extensional crack,shearing crack and extensional\|shearing crack),interlayer lamellation crack,bedding glide crack,diagenetic shrink micro-cracks,and abnormal pressure crack of organic evolution.Geologic factors controlling the fissure formation are complex,such as regional tectonic stress,tectonic position,sedimentary diagenesis,lithology,lithofacies,poroperm characteristics,and formation pressure.The identification characteristic of fissure and its formation mechanism is different,so the effect on adsorption,segregation,and response to seepage property of shale gas is not identical.Exploration target zone of shale gas should be set on muddy shale with higher permeability or reconstructional fissures.
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