普光地区千佛崖组一段流体包裹体特征及其地质意义  

Characteristics and geological significance of fluid inclusions in the first Member of Qianfoya Formation in Puguang area

作　　者：康华[1] 周勇水[1] 徐田武[1] 张云献[1] 姜鹏[1] 张莹莹 郭金兰[1] 李潇 陈帆[1] KANG Hua;ZHOU Yongshui;XU Tianwu;ZHANG Yunxian;JIANG Peng;ZHANG Yingying;GUO Jinlan;LI Xiao;CHEN Fan(Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang 457001,China)

机构地区：[1]中国石化中原油田分公司勘探开发研究院,河南濮阳457001

出　　处：《断块油气田》2023年第6期947-953,990,共8页Fault-Block Oil & Gas Field

基　　金：中国石油化工股份有限公司项目“川东北地区陆相致密砂岩气藏富集高产规律与区带优选”(P22074)。

摘　　要：针对普光地区千佛崖组一段陆相油气性质差异大、油气成藏期次不清等问题,文中利用包裹体均一温度和激光拉曼光谱对普光地区千佛崖组一段储层中的包裹体进行了研究。研究表明:普光地区千佛崖组一段有机包裹体主要有含液烃甲烷包裹体、含焦沥青甲烷包裹体和甲烷包裹体3类,这3类包裹体的特征显示普光地区千佛崖组一段至少存在原油充注、原油裂解和天然气充注的3期成藏过程;通过包裹体均一温度测试发现,普光地区千佛崖组一段中甲烷包裹体均一温度在-109.1~-91.2℃,密度为0.271~0.332 g/cm3,属于超临界状态高密度甲烷包裹体,其捕获压力达到了96.16~156.61 MPa,显示明显的超压特征。这一发现为普光地区千佛崖组一段致密砂岩和泥页岩储层裂缝形成机制和气藏富集规律研究提供了重要的理论依据。In view of the large difference in the nature of continental oil and gas and the unclear time of the hydrocarbon accumulation period in the first Member of Qianfoya Formation in Puguang area,in this paper the inclusion homogenization temperature measurement and laser Raman spectroscopy are used to study the inclusion in the reservoir of the first Member of Qianfoya Formation in Puguang area.The study shows that there are three kinds of organic inclusions in the first Member of Qianfoya Formation in Puguang area,which are liquid hydrocarbon-bearing methane inclusions,pyrobitumen-bearing methane inclusions and methane inclusions.The characteristics of three kinds of inclusions indicate that there are at least three accumulation processes of oil charging,oil cracking and natural gas charging in the first Member of Qianfoya Formation in Puguang area.Through homogenization temperature test,it is found that the homogenization temperature of the methane inclusions are between-109.1 and-91.2℃in the first Member of Qianfoya Formation in Puguang area,and the corresponding density values range from 0.271 g/cm3 to 0.332 g/cm3.It belonging to high density methane inclusions in supercritical state,and its trapping pressure was reached 96.16-156.61 MPa,shows obvious overpressure characteristics.This discovery provides an important theoretical basis for the study of fracture formation mechanism and gas reservoir enrichment law of tight sandstone and shale reservoirs in the first Member of Qianfoya Formation in Puguang area.

关 键 词：甲烷包裹体 激光拉曼光谱 均一温度 密度 捕获压力 千佛崖组 

分 类 号：TE122.1[石油与天然气工程—油气勘探]