准噶尔盆地南缘玛河气田紫泥泉子组沉积相

Sedimentary Facies of Palaeogene Ziniquanzi Formation in Mahe Gas Field in Southern Margin of Junggar Basin

对准噶尔盆地南缘古近系紫泥泉子组的沉积构造背景、沉积相标志进行分析,认为玛河气田紫泥泉子组为辫状河三角洲沉积,发育辫状河三角洲平原、三角洲前缘、前三角洲3种亚相及水下分流河道等8种微相,整体显示湖退—湖侵的沉积演化特征。对比沉积相与物性、产能特征后认为,最有利的沉积微相为水下分流河道。

This paper analyzes the sedimentary structural setting and sedimentary facies symbol of Ziniquanzi formation of the Paleogene in southern margin of Junggar basin, and suggests that the Ziniquanzi formation in this area appears braided river delta deposits, and develops such three subfacies as delta plain, delta front and prodelta as well as eight microfacies like underwater distributary channel and others. The overall displays the evolution characteristics of lake regression and transpression. The contrast of the sedimentary facies, petrophysical property and productivity performance indicates that the most favorable sedimentary microfacies is the underwater distributary channel