【摘 要】
：
以场发射扫描电镜与Pores and Cracks Analysis System(PCAS)图像处理软件为主要研究手段,以形状系数为孔隙形态表征参数,并选取低压N2吸附等为辅助研究手段,对四川盆地及周
【机 构】
：
油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059成都理工大学能源学院,成都610059;生态环境部南京环境科学研究所,南京,210042;油气藏地质及开发工程国家重点实验室(西南石
论文部分内容阅读
以场发射扫描电镜与Pores and Cracks Analysis System(PCAS)图像处理软件为主要研究手段,以形状系数为孔隙形态表征参数,并选取低压N2吸附等为辅助研究手段,对四川盆地及周缘地区的典型钻井A-D井龙马溪组及筇竹寺组黑色页岩中纳米孔隙的形态特征进行定量研究.研究发现黑色页岩纳米孔隙形态受孔隙类型(赋存位置)、有机质显微组分、地层埋藏深度、热成熟度及孔隙尺寸等因素综合控制.具体体现在:(1)有机质孔、粒间孔和粒内孔所占比例、孔径分布与孔隙形态具有明显差异,反映这三类孔隙的演化受成岩作用的影响不同.(2)固体沥青纳米孔隙比其他显微组分中的纳米孔隙更加规则.(3)与埋藏深度密切相关的压实作用很可能会在垂向上压缩孔隙,一方面令孔径缩小,另一方面让孔隙形态往狭长–裂缝形发展.(4)有机质孔形态随热成熟度升高总体上会变得更加规则,但这种趋势可能会被孔隙间的合并及压实作用等破坏.(5)面积更小的孔隙形态往往比面积更大的孔隙更规则.初步研究显示固体沥青纳米孔隙形态代表着高过成熟页岩气储层中主体储集空间所处压力环境,但固体沥青纳米孔隙形态随孔隙压力的演化模式及利用固体沥青纳米孔隙形态表征其所在层系异常高压维持状况及页岩气保存状况的可能性尚需进一步研究.
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