基于颗粒荧光定量技术的油气运移路径——以车排子凸起沙湾组砂岩输导层为例

Hydrocarbon migration pathway based on Quantitative Grain Fluorenscence Techniques:A case of sandstone carrier beds of Shawan formation in Chepaizi uplift

准噶尔盆地车排子凸起沙湾组的油气来源于东侧的昌吉凹陷和南侧的四棵树凹陷,分析连接烃源岩与油气藏的砂岩输导层的输导特征和性能,结合颗粒荧光定量技术测定的QGF指数变化趋势和光谱特征,追踪沙湾组砂岩输导层油气运移路径.结果表明:研究区沙湾组一段东侧和沙湾组二段南侧砂体于地质历史时期发生油气运移;排612—排609井、排606—排602井一带和排8井区为沙一段油气由东南至西北方向的优势运移路径,与红车断裂带共同构成油气垂向和侧向运移的高效通道;优势运移路径指向的西北地区继承性构造高部位的岩性、地层和岩性—构造等圈闭是未来勘探的重点.

The oil found in Shawan formation in Chepaizi area may be sourced by the eastern Changji depression and the southern Sikeshu depression.This paper analyzes the transportation features and capability of sandstone carrier beds which connect the source rocks and reservoirs,then combines the Quantitative Grain Fluorescence(QGF)results to trace the hydrocarbon migration pathway of sandstone,Shawan formation.The results identify that the eastern part of 1st member and the southern part of 2nd member sandstone,Shawan formation were actual hydrocarbon migration channels,and channels from well Pai612 to Pai609,well Pai606 to Pai602 and well Pai 8 section were the dominant migration pathway,which worked together with Hongche faults belt as vertically and laterally effective path.The stratigraphic traps and lithologic traps of 1st member,Shawan formation which is located historically the structural highs and in the direction of dominant migration pathway are the aims for future exploration.