摘要
通过吐哈盆地石炭系—下二叠统钻井和露头石灰岩与泥岩有机地球化学特征的对比,探讨了风化作用对烃源岩有机质特征的影响。分析发现,泥岩的有机质丰度普遍高于石灰岩,作为烃源岩,泥岩好于石灰岩,主要与沉积环境和物质来源不同有关。野外露头样品的保存条件明显比盆地深部烃源岩样品要差。同一层位同一岩性样品在钻井和露头上出现的差异与风化作用有关。风化作用对可溶有机质的总体组成、中低分子烃类含量等均有影响,对可溶有机质的破坏比对固体有机质要强。泥岩与石灰岩相比抵抗风化作用的能力更强。
Based on drilling of Carboniferous-Lower Permian and comparison of the organic geochemical characteristics of outcrop limestone and mudstone in Turpan-Hami Basin, this paper elaborates the influence of weathering effects on organic characteristics of source rock. The analysis indicates that organic abundance of mudstone is generally higher than that of limestone. So far as hydrocarbon source rock is concerned, mudstone is better than limestone thanks to the different sedimentary environment and material sources. The conserving conditions for samples of field outcrops are apparently poorer than those samples of source rock in the deep layers of the basin. If the samples form the same strata and the same lithology become different, at the drilling and outcropping, this phenomenon is related to weathering effects. Weathering effects can exert influence on total components of dissoluble organic matters and hydrocarbon content of middle and lower molecules, causing more serious damage on dissoluble organic matters than solid dissoluble organic matters. As compared to limestone, mudstone can more strongly resist weathering effects.
出处
《中国石油勘探》
CAS
2014年第6期33-39,共7页
China Petroleum Exploration
基金
国家自然科学基金“碳酸盐岩缝合线有机质富集与油气运移作用研究”(41372142)
关键词
烃源岩
露头
石炭系
下二叠统
吐哈盆地
source rock, outcrop, Carboniferous System, Lower Permian, Turpan-Hami Basin
