准噶尔盆地南缘泥火山活动及其伴生油苗的地球化学特征和意义.pdfVIP

2013 年 9 月，第 19 卷，第 3 期，484-490页 高 　校　地　质　学　报 September 2013，Vol. 19，No.3， p. 484-490 Geological Journal of China Universities 准噶尔盆地南缘泥火山活动及其伴生油苗的 地球化学特征和意义 李 梦，刘冬冬，郭召杰 北京大学 地球与空间科学学院，北京 100871 摘要：文中对准噶尔盆地南缘乌苏四棵树和独山子泥火山的构造背景进行了分析，指出其形成主要是由于天山北缘中新生 代沉积层中地势高低造成的水压差和地层层间压力差，导致丰富的地下水沿着背斜顶端发育的断裂带上升，与通道周围的 泥质岩石相遇，泥浆形成并喷出地表而成为泥火山。论文还对四棵树和独山子泥火山的伴生油苗进行了全油色谱和生物标 记化合物研究，对比相关烃源岩地球化学特征及前人有关研究成果，指出油样有机质均处于成熟阶段，油源可能是侏罗系 与古近系烃源岩的混合产物。研究结果对探索该区泥火山的成因和油气成藏条件具有重要意义。 关键词 ：泥火山；准噶尔盆地南缘；构造特征；油苗地球化学分析 中图分类号：P618.130.1　　　　　　　　文献标识码：A　　　　　　　　文章编号：1006-7493（2013）03-484-07 Geological Characteristics of Mud Volcanoes and Geochemical Significance of the Associated Oil Seepages in the Southern Junggar Basin LI Meng, LIU Dongdong, GUO Zhaojie School of Earth and Space Sciences, Peking University, Beijing 100871, China Abstract: This paper analyzes the tectonic background of the Sikeshu and Dushanzi mud volcanoes, and points out that under the effect of water pressure difference caused by the terrain of Meso-Cenozoic sediments in the northern Tianshan, the rich groundwater rises along the fault zone developed at the anticline top and meets with clay rocks around the passage. Then the mud is formed and erupts to the surface as the mud volcanoes. The paper also studies chromatogram of oil and biomarkers of the associated oil seepages in Sikeshu and Dushanzi mud volcanoes. Comparing with the geochemical characteristics of potential source rocks and the previous results, we suggest that all samples are mature and probably are the mixed production of Jurassic and Tertiary oil sources. This study provides important clues to the oil and gas exploration in southern Jungga