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研究表明,泥页岩中不同有机母质类型可以发育不同特征的有机质孔隙。用Ar离子抛光场发射扫描电镜照片观察结合XRD分析、EDS能谱分析和相关岩石学标准,将四川盆地龙马溪组泥岩有机质孔隙分为3种类型:热解沥青内部有机质孔(Ⅰ型)、顺矿物边界发育的线性有机质孔(Ⅱ型)、干酪根残余物孔隙(Ⅲ型)。其中,Ⅰ型有机质孔发育于运移后的固体沥青和残余沥青中,Ⅱ型有机质孔的形成机制尚不明确,Ⅲ型有机质孔发育于原始沉积的干酪根残余物内部。热解沥青孔隙能为页岩气体流动提供更有效和连续的渗透路径。
The results show that different types of organic parent material in shale can develop different characteristics of organic matter pores. According to XRD analysis, EDS spectrum analysis and related petrology criteria, the pores of organic matter in the mudstone of Longmaxi Formation in Sichuan Basin are divided into three types: the organic matter pores (type I) in pyrolysis asphalt, Linear organic pores (type II) developed along the boundaries of minerals, kerogen residue pores (type III). Among them, Type I organic pores develop in solid and post-migrated bitumen. The formation mechanism of Type II organic pores is not clear yet. Type III organic pores develop inside the originally deposited kerogen residue. Pyrolysis pitch pores provide a more efficient and continuous infiltration path for shale gas flow.