烃类包裹体荧光光谱技术划分油气成藏期次———以川中古隆起地区震旦系灯影组为例  

Determination of hydrocarbon accumulation stages using fluorescence spectrum of hydrocarbon inclusions:A case study of Sinian Dengying Formation in central Sichuan paleo-uplift area

作　　者：邹鑫洁 肖晖 成良丙 ZOU Xinjie;XIAO Hui;CHENG Liangbing(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi’an 710065,China;Exploration&Development Research Institute of PetroChina Changqing Oilfield Company,Xi’an 710065,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]陕西省油气成藏地质学重点实验室,西安710065 [3]中国石油长庆油田公司勘探开发研究院,西安710065

出　　处：《非常规油气》2024年第3期49-57,共9页Unconventional Oil & Gas

基　　金：陕西省教育厅重点研究计划项目“鄂尔多斯盆地奥陶系高-过成熟度烷烃气甲-乙烷倒转机理研究”(17JS109)。

摘　　要：流体包裹体显微荧光光谱技术,是利用显微荧光光谱技术对包裹体的荧光性质进行研究,以确定包裹体的流体性质、化学成分及形成时代的一种研究方法。运用烃类包裹体显微荧光光谱分析以及包裹体测温的技术手段,对川中古隆起灯影组油气成藏期次进行分析。通过实验检测,观察到灯影组储层中存在3种荧光颜色的烃类包裹体,分别为橙色、黄绿色和蓝白色,显示了包裹体中充注的油从低成熟度到高成熟度的变化。通过包裹体显微荧光光谱参数分析,结合埋藏生烃史及包裹体的均一温度测定分析,得到的结论是研究区灯影组油藏共经历了3期油气充注:第Ⅰ期发橙色荧光的低成熟度油的充注时间约在志留世—晚泥盆世期间;第Ⅱ期发黄绿色荧光的中等成熟度油的充注时间约为早三叠世—早侏罗世期间;第Ⅲ期高成熟度油气的充注时间约在晚侏罗世—早白垩世之间。第Ⅰ期和第Ⅱ期主要为原油充注,第Ⅲ期为古油藏裂解生气形成气藏。该研究成果与前人根据构造运动以及研究区包裹体均一温度划分的油气成藏期次结论相印证,对川中地区进一步油气勘探工作具有重要指导意义。Micro-fluorescence spectroscopy technology of fluid inclusion is a research method used to study the fluorescence properties of inclusions to determine the fluid properties,chemical composition,and formation stages of inclusions.Uses the techniques of microscopic fluorescence spectroscopy analysis of hydrocarbon inclusions and inclusion temperature measurement to analyze the Sinian accumulation stages of Dengying Formation in the central Sichuan paleo-uplift area.Through experimental detection,it was observed that there are three fluorescent colors of hydrocarbon inclusions in Dengying Formation reservoir,namely orange,yellow-green,and blue-white,indicating the change from low to high maturity of the charged oil in inclusions.Based on the microscopic fluorescence spectrum parameters,the homogeneous temperature measurement analysis of the inclusions,and the burial hydrocarbon generation history,it is concluded that Dengying Formation reservoir in the study area have undergone three stages of hydrocarbon charging.The charging time of the low maturity oil with orange fluorescence in the first stage is from the Silurian to the Late Devonian.The charging time of the medium maturity oil with yellow-green fluorescence in the second stage is about the Early Triassic to the Early Jurassic.The charging time of the high maturity oil and gas in the third stage is about the Late Jurassic to the Early Cretaceous.The first and second stages are mainly crude oil charging,and the third stage is the formation of gas reservoirs by cracking gas in ancient reservoirs.This research result is consistent with the conclusions of previous researchers on the oil and gas accumulation stages divided based on tectonic movements and the homogeneous temperature of inclusions in the study area and also has important guiding significance for further oil and gas exploration work in the central Sichuan region.

关 键 词：流体包裹体 显微荧光 油气成藏期次 震旦系 川中古隆起 

分 类 号：P618.13[天文地球—矿床学]