柴窝堡凹陷达坂城次凹上二叠统烃源岩的地球化学特征及勘探方向

通过对准噶尔盆地柴窝堡凹陷达坂城次凹柴参1侧1井、达1井和小平槽沟剖面烃源岩的系统研究，认为达坂城次凹烃源岩的显微组分以镜质组为主；柴参1侧1井和达1井烃源岩的成熟度较高，但有机质丰度很低，为非—差烃源岩；小平槽沟剖面烃源岩的成熟度达成熟—高成熟阶段，有机质丰度高，有机碳最高达3.87%，并且芦草沟组烃源岩的生烃潜力远大于红雁池组。达坂城次凹的有机质来源主要以陆源高等植物为主，形成于具有一定盐度或水体分层的强还原湖相沉积环境。小平槽沟剖面的有机质可分为两种，两者在原始有机质来源、沉积环境以及成熟度方面均存在明显的差异。油源对比表明，上二叠统优质烃源岩主要分布于达坂城次凹东北部，其生成的油气沿燕山、喜山期形成的断裂以及上二叠统孔、渗性较好的输导层向西南方向斜坡带的较高部位运移。因此，斜坡带的较高部位为勘探的主要有利方向。

Geochemical Characteristics of Upper Permian Source Rocks and Exploration Directions in Dabancheng Sub-Depression of Chaiwopu Depression

The paper systematically studied source rocks of Well Chaican-1Ce-1,Da-1 and Section of Xiaopingcaogou,Dabancheng Sub-Depression of Chaiwopu Depression.It shows that organic macerals of the source rocks are mainly composed of vitrinite.Source rocks of Well Chaican-1Ce-1 and Da-1 have high maturity,but lower abundance of organic matter,and low potential of oil generation.Source rocks of Section Xiaopingcaogou have higher maturity and higher concentration of organic matter,concentration of TOC amount to 3.87% at most,at the same time,oil generation potential of P_(2)l are much more great than P_(2)h.All the sources of the organic matter are mainly from terrestrial higher plant,and formed in the reductive lake environment of saline or water column stratification environment.The best source rocks of Upper Permian are distributed in the northeast of the Sub-depression.Oil and gas generated in the northeastmoved to the southwest,the higher part of the slope through fault and permeable carrier layer,and accumulated in the favorable place of strata and structure.As a result,higher place of slope is the favored direction of exploration.