准噶尔盆地滴水泉凹陷石炭系烃源岩生烃能力分析

Hydrocarbon generation capacity analysis of Carboniferous source rocks in Dishuiquan sag of Junggar Basin

利用钻井岩心和露头样品化验资料,对石炭系烃源岩有机质丰度、类型及演化程度进行研究,结合凹陷周缘构造油气来源特征,分析滴水泉凹陷石炭系烃源岩生烃能力。研究表明,滴水泉凹陷石炭系烃源岩有机质丰度高,沉积厚度大,目前已到高-过成熟阶段,具有较强生烃能力;滴南凸起存在'凹槽',东道海子北凹陷来源油气不能运移到克拉美丽气田石炭系储层聚集成藏,克拉美丽气田亿吨级油气应来自滴水泉凹陷;石东油气田深浅层油气特征基本一致,与石西油田不同,与克拉美丽石炭系油气相似,都属于滴水泉凹陷石炭系来源产物;滴水泉凹陷、三南凹陷及东道海子北凹陷石炭纪沉积期水体连通,石炭系烃源岩都应具有较强的生烃能力,勘探潜力巨大。

Based on the analysis of assay data of cores and outcrop samples, abundance, types of organic matter and evolution of Carboniferous source rocks from Dishuiquan sag were studied. And the hydrocarbon generation ability of Carboniferous source rocks was analyzed based on the characteristics of oil and gas source in peripheral structures of sag. The results show that the source rocks are characterized by high-abundance organic matters, great sedimentary thickness and great hydrocarbon generation ability, which have reached the postmaturity stage till now. Combined with the feature of the structure, the exist- ence of ＂groove＂ in swell of southern Dinah and the unsuccessful migration of the oil and gas from northern Dongdaohaizi sag to the Carboniferous of Kelameili gas field for accumulation were presented. Million tons of oil and gas in Kelameili gas field should come from Dishuiquan sag. The oil and gas of Shidong field from both deep and shallow layers are almost the same, which is different from that Shixi field, but the same as the Carboniferous of Kelameili gas field because they both come from Dishuiquan sag. Integrated with paleogeographical distribution and structural evolution of this region, waters in Dishuiquan sag, Sannan sag and northern Dongdaohaizi sag are connected in the depositional stage of the Carboniferous period. Carbonif- erous hydrocarbon source rocks should have great capacity of hydrocarbon production and fine potential for exploration.