高岗1,向宝力2,王轩1,王熠2,周然然3,马万云2,任江铃2,赵克3
Gao Gang1,Xiang Bao-li2,Wang Xuan1,Wang Yi2,Zhou Ran-ran3,Ma Wan-yun2,Ren Jiang-ling2,Zhao Ke3
摘要: 准噶尔盆地吉木萨尔凹陷芦草沟组湖相混合沉积中有机质富集并且有缝合线分布。通过Jy74等井的岩心观察发现,沉积岩中有较多的微裂缝与缝合线,缝合线发育程度低,其中的锯齿状缝合线变化幅度较大,主要与单纯的压溶作用有关,往往延伸范围大,可以切穿层理;波状缝合线一般变化幅度小,主要在层面基础上通过压溶作用形成,延伸范围可大可小。缝合线有利于有机质富集,并与微裂缝组合利于油气运移。通过Jy74井有缝合线与无缝合线发育的岩石有机质丰度对比认为,缝合线的形成与有机质丰度和碳酸盐含量的关系不明显。通过不同岩性有机质丰度与矿物成分的相关分析可见,芦草沟组混合沉积的有机质富集受多种因素控制,砂岩、云岩与灰岩以运移烃为主,泥岩主要为残留烃,但部分云岩、砂岩与灰岩不同程度地含有原始固体有机质,具有生烃潜力,以泥岩类的生烃能力最强。
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