升平-兴城气田营城组火山岩储层流体包裹体研究

升平-兴城气田营城组火山岩储层经历多次构造活动,具有多期天然气的充注特征。采自该气田20口井45块岩芯样品的流体包裹体系统分析揭示了该区复杂的天然气充注过程。对各期次流体包裹体的均一温度、盐水包裹体的盐度,以及含烃盐水包裹体的荧光强度等测试的综合分析表明,火山岩储层经历了6期热流体活动,前4期分别对应于4期天然气充注过程。结合埋藏史分析可知,4期充注分别发生于泉头组沉积末期-青山口组沉积时期、嫩江组沉积早-中期、嫩江组沉积末期和明水组沉积早期至今。综合考虑生烃层、储层和盖层之间的组合关系,最终确定升平-兴城气田营城组火山岩储层天然气主要的成藏时期为嫩江组沉积早-中期。

Fluid Inclusion Analysis of Vocanic Reservoir in the Yingcheng Formation of the Shengping-Xingcheng Gas Field

Volcanic reservoir of the Yingcheng Formation in the Shengping-Xingcheng gas field experienced many tectonic activities and was characterized by multiple hydrocarbon charging.Based on 45 core samples from 20 wells of the Shengping-Xingcheng gas field,systematic analysis of fluid inclusions was employed to study the complicated hydrocarbon charging histories.The results of fluorescence observation on hydrocarbon inclusions and microthermometry of both hydrocarbon and aqueous inclusions indicated that the volcanic reservoir of the Yingcheng Formation experienced six thermal fluid activities corresponding to four times of hydrocarbon charging.Comprehensive analysis of fluid inclusion and buried history curve shows that the four times of hydrocarbon charging happened in the late Quantou age to the Qingshankou age,the early to the middle of Nenjiang age,the late of Nenjiang age and the early Mingshui age to now.The integrated information suggests that the critical moment for gas charging is from the early to the middle of Nenjiang age.