准东地区石炭系烃源岩特征及分布规律

Geochemical Characteristics of Carboniferous Source Rocks and Distribution in the Eastern Part of Junggar Basin

准东地区石炭系有机质以腐殖型和混合型为主,具有烃源岩厚度大、有机质丰度较高及成熟度普遍较高的特征,总体为中等—好烃源岩。由于沉积环境和构造运动对有机质的丰度和热演化程度的影响较大,导致石炭系烃源岩的品质在纵向上和横向上具有差异性,表现为纵向上巴塔玛依内山组最好,横向上五彩湾凹陷和北三台地区最好。

The organic matter types for Carboniferous source rocks in Junggar basin are humic and mixing of humic and sapropelic. The Carboniferous source rocks in this area have the large thickness and high TOC, and are fallen within the high thermal maturity. Thus, the source rocks are prone to be moderate-good scope in the source rock classification. The sedimentary environment and tectonic movements greatly constrained the abundance of organic matter and thermal evolution and caused the difference of the quality of Carboniferous source rocks in the vertical and horizontal directions. For example,the Batamayi Formation has the high quality of source rock in vertical direction,in contrast that the Wucaiwan and Beisantai Formations have the high quality of source rock in horizontal areas.