鄂尔多斯盆地延安地区延长组成藏期次研究

A Study on the Extension of Compositional Reservoirs in Yan'an Area,Ordos Basin

通过包裹体观察、包裹体显微测温和液态烃包裹体荧光光谱分析,并结合盆地埋藏史、热史分析,探讨了鄂尔多斯盆地延安地区延长组成藏期次。研究表明:延安地区延长组储层捕获盐水包裹体、含液态烃包裹体和液态烃包裹体三类包裹体,主要发育在石英愈合微裂隙中;包裹体均一温度范围从80℃~140℃均有发现,峰值介于95℃~115℃,均一温度无明显间断,液态烃类包裹体荧光光谱参数在数值上连续分布,延长组储层内油气充注是一个相对漫长且连续的过程,油气大量充注的时间在110~130 Ma(早白垩世末期)

Through the observation of inclusions, microscopic temperature measurement of inclusions and fluorescence spectroscopic analysis of liquid hydrocarbon inclusions, combined with the analysis of the basin＇s buried history and thermal history, the prolonged composition of Yanan area in the Ordos Basin was discussed. The results show that： Yantai Formation Yan＇an reservoir captures three types of inclusions, including brine inclusions, liquid hydrocarbon inclusions and liquid hydro- carbon inclusions, which are mainly developed in the quartz fracture microcrack. The homogenization temperature of the inclu- sions ranges from 80°C to 140°C. It has been found that the peaks range from 95°C to 115°C , and the homogenization temper- ature is not significantly interrupted. The fluorescence spectral parameters of liquid hydrocarbon inclusions are continuously distributed numerically. The hydrocarbon charge in the Yanchang Formation is a relatively long and continuous process. A large amount of filling time is 110 - 130 Ma （at the end of Early Cretaceous）