川东北飞仙关组鲕滩气藏天然气运聚效率

李吉君; 卢双舫; 薛海涛; 胡国艺; 谢增业; 徐庆霞

Volume 33 Issue 4

Jul. 2008

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Article Navigation > Earth Science > 2008 > 33(4): 565-571

LI Ji-jun, LU Shuang-fang, XUE Hai-tao, HU Guo-yi, XIE Zeng-ye, XU Qing-xia, 2008. Migration and Accumulation Efficiency of Natural Gas in Feixianguan Formation Oolitic Gas Reservoirs, Northeastern Sichuan Basin. Earth Science, 33(4): 565-571.

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

1.
College of Earth Sciences, Daqing Petroleum Institute, Daqing 163318, China
2.
Lang f ang Branch of PetroChina Exploration and Development Research Institute, Lang f ang 065007, China

Received Date: 2007-09-27
Publish Date: 2008-07-25

Abstract

Abstract

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 20Ma, the period of 172-151Ma 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 caprocks in the fourth member of Feixianguan Formation, Jialingjiang 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.
- oil-cracking gas,
- carbon isotope fractionation,
- chemical kinetics,
- migration and accumulation efficiency,
- Feixianguan Formation,
- northeastern Sichuan

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References(47)

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

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