新疆西准噶尔地区晚古生代残余洋盆生烃潜力

残余洋盆的含油气远景日益引起研究者的重视。新疆西准噶尔地区及其邻区晚古生代发育巴尔喀什—西准噶尔残余洋盆，博乐—艾比湖凹陷位于该残余洋盆南缘。在凹陷上古生界中，发育多套以泥岩、泥灰岩和生物灰岩为主的上泥盆统—下石炭统烃源岩。烃源岩总有机碳含量平均值为2.19%，最大值达7.11%，且抽提物饱和烃奇数碳优势明显，呈双峰式分布，不同于准噶尔盆地中部区块的原油特征，与博乐—艾比湖凹陷油浸碎屑岩特征较为接近。根据碳数的轻重比和沥青质含量，推测博乐—艾比湖凹陷之中保存良好的上古生界烃源岩仍处于一般成熟阶段，具有较强的生烃潜力。

Hydrocarbon-generating potentials analysis on late Paleozoic residual ocean basin in West Junggar

The hydrocarbon-generating potentials of residual ocean basin get more and more attention. Based on the fact that the Junggar basin is underlain by the Precambrian continental block, an upper Paleozoic residual ocean might exist in west Junggar and aast Kazakhstan named the Balkhash-West Junggar residual ocean. Bole-Ebinur Lake sag lies in the south margin of the basin. Many sets of source rocks composed of upper Devonian-lower Carboniferous mudstone, marlstone and biolithite limestone are discovered from Bole-Ebinur Lake sag in southwestern margin of basin. The average TOC of source rocks is 2.19%, and the maximum is 7.11%. And, more close to oil-soaked clastic rocks in Bole-Ebinur Lake sag, the saturated hydrocarbon of source rock extract shows bimodal distribution type with odd-carbon predominance. According to light-to-heavy carbon-number ratios and asphaltenes contents, the upper Paleozoic source rocks well-preserved in the basin are still in a medium mature stage with high hydrocarbon-generating potentials.