石油实验地质2025，Vol.47Issue(3)：621-633,13.DOI:10.11781/sysydz2025030621
准噶尔盆地乌夏断裂带风城1井区油源对比及其地质意义
Oil and source correlation and its geological significance of Fengcheng 1 well block in Wuxia fault zone,Junggar Basin
摘要
Abstract
As the conventional oil and gas exploration in the Wuxia fault zone of the western uplift of the Junggar Basin enters its later stages,great breakthroughs have been made in shale oil exploration of the Lower Permian Fengcheng Formation in the past two years.In the process of exploring the accumulation patterns of conventional and shale oil reservoirs in the Fengcheng Formation,it was found that previous understanding of the oil sources in Fengcheng 1 well block was inaccurate.Earlier researchers believed that crude oil in this well block was solely derived from the source rocks of the Fengcheng Formation.To reevaluate this understanding,various organic geochemical data from Permian source rocks and crude oil in existing exploration wells of this area were systematically analyzed.By applying the geochemical oil and source correlation theory and petroleum geology theory,and using chromatography,chromatography-mass spectrometry,and carbon isotope data from source rocks and crude oil,the study reexamined the oil sources in various oil-producing formations in the well block,combined with single-well simulations of source rock thermal evolution history.The results showed that the lower gray-black and black mudstone section of the Lower Permian Jiamuhe Formation,with a thickness of approximately 95 m,had a sedimentary environment and parent material type similar to those of the Fengcheng Formation.However,the parent material type in the Jiamuhe Formation was relatively more humic,with higher organic matter abundance,making it a highly mature humic type,good to high-quality source rocks.The mature crude oil in the upper part of the first member of the Fengcheng Formation in Fengcheng 1 well originated from the source rocks of the Fengcheng Formation.The highly mature crude oil in the two lower oil layers and the Jiamuhe Formation oil layer in Fengcheng 011 well mainly sourced from the source rocks of the Jiamuhe Formation,with a small contribution from the source rocks of the Fengcheng Formation,rather than exclusively from the source rocks of the Fengcheng Formation.It is speculated that the source rocks of the Jiamuhe Formation have a wide spatial distribution range and can provide substantial oil and gas resources for conventional oil and gas accumulation in the Wuxia fault zone.Therefore,it is recommended to strengthen the research on the thickness distribution of source rocks of the Jiamuhe Formation in this area,providing a basis for identifying new oil and gas exploration fields.关键词
油源对比/风城组/佳木河组/下二叠统/风城 1 井区/乌夏断裂带/准噶尔盆地Key words
oil and source correlation/Fengcheng Formation/Jiamuhe Formation/Lower Permian/Fengcheng 1 well block/Wuxia fault zone/Junggar Basin分类
石油、天然气工程引用本文复制引用
刘冠伯,陈世加,何文军,张洋洋..准噶尔盆地乌夏断裂带风城1井区油源对比及其地质意义[J].石油实验地质,2025,47(3):621-633,13.基金项目
国家自然科学基金(41872165,42072185)和中国石油—西南石油大学创新联合体(2020CX030000,2020CX050000)项目联合资助. （41872165,42072185）
