川东北飞仙关组鲕滩气藏天然气运聚效率  

Migration and Accumulation Efficiency of Natural Gas in Feixianguan Formation Oolitic Gas Reservoirs,Northeastern Sichuan Basin

作　　者：李吉君[1] 卢双舫[1] 薛海涛[1] 胡国艺[2] 谢增业[2] 徐庆霞[1] 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《地球科学（中国地质大学学报）》2008年第4期565-571,共7页Earth Science-Journal of China University of Geosciences

基　　金：教育部新世纪优秀人才支持计划项目(No.NCET-04-0345);国家自然科学基金项目(No.40572079);高等学校博士学科点专项科研基金项目(No.20050220001)

摘　　要：设计进行了封闭体系下原油裂解成气的模拟实验,建立并标定了原油裂解成气及其碳同位素分馏的化学动力学模型,以罗家寨气田罗家7井为例分别进行了地质应用.生烃动力学研究发现,飞仙关组古油藏具备"高效气源灶"的特点,原油在中晚侏罗世172～151Ma约20Ma时期内裂解殆尽,且原油裂解气的生成与其运聚成藏作用具有良好的时空匹配关系,由此可促成飞仙关组气藏天然气的高效运聚.碳同位素分馏动力学研究证实甲烷成藏参与率达87%.利用生烃动力学与碳同位素分馏动力学结合的方法对天然气的运聚效率进行探讨是一个新的有效途径.An oil cracking experiment in a closed system was designed and carried out. Based on this, kinetic models for describing gas generation from oil cracking and carbon isotope fractionation during this process were established, calibrated and then applied to Luojia 7 well located in the Luojiazhai gas field respectively. From the hydrocarbon generation kinetics research, it is found that Feixianguan Formation ancient oil reservoirs are ＂high efficiency gas sources＂. Their oil almost cracked completely in only about 20 Ma, the period of 172--151 Ma in the Middle--Late Jurassic. And along vertical faults, the oil-cracking gas migrated fast into the Feixianguan Formation oolitic reservoir with a high porosity and permeability and sealed perfectly by gypsum eaprocks in the fourth member of Feixianguan Formation, Jialingiiang Formation and Leikoupo Formation. Consequently, a highly efficienct migration and accumulation of natural gas could be formed. Carbon isotope fractionation kinetics research proves that the accumulation participation rate of methane amounts to 87%. It is a new and effective method to evaluate the migration and accumulation efficiency of natural gas with a combination of hydrocarbon generation kinetics and carbon isotope fractionation kinetics.

关 键 词：原油裂解气 碳同位素分馏 化学动力学 运聚效率 飞仙关组 川东北 

分 类 号：P618.130.1[天文地球—矿床学]