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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。
Organic matter accumulation and suture distribution in the Lucaogou Formation lacustrine sediments in Jimusar Depression, Junggar Basin. Through the core observation of well Jy74 et al., It is found that there are many microcracks, sutures and sutures in sedimentary rocks with low degree of development. Serrated sutures vary widely in size and are mainly related to simple pressure-dissolving effects, Large, you can cut through the bedding; wavy sutures generally small changes in amplitude, mainly in the formation of pressure-dissolving effect on the basis of formation, the extension can be large or small. Sutures are conducive to enrichment of organic matter, and combined with microfractures conducive to hydrocarbon migration. By contrasting the abundance of rocks in Jy74 with suture and suture, the relationship between suture formation and organic matter abundance and carbonate content is not obvious. Through the correlation analysis of abundance and mineral composition of different lithology, it can be seen that the organic matter accumulation of mixed sedimentation in Lucaogou Formation is controlled by many factors, while the sandstone, dolomite and limestone mainly transport hydrocarbons, while the mudstone is mainly residual hydrocarbon However, some dolomites, sandstones and limestones contain the original solid organic matter with different degrees of hydrocarbon generation potential, and mudstones have the highest hydrocarbon generation capacity.