石油实验地质Issue(5)：561-565,574,6.DOI:10.11781/sysydz201505561
川西坳陷中段侏罗系气藏特征与富集主控因素
Characteristics and main factors controlling the Jurassic gas reservoirs in the middle section of the Western Sichuan Depression
摘要
Abstract
In the middle section of the Western Sichuan Depression, lithologic and tectonic⁃lithologic gas reser⁃voirs are widespread in the Jurassic. These reservoirs feature multiple layers, local enrichment, no obvious gas/water boundary, low temperature and overpressure. Accumulation conditions in the Jurassic indicate that gases were mainly sourced from the Lower Jurassic and preserved in the Upper Jurassic. The fourth and fifth members of the Xujiahe Formation provided important source rocks for natural gases. Vertical pathways connections between source rocks and reservoirs were the factors controlling natural gas accumulations. The physical properties of the Jurassic sandstones varied both horizontally and vertically. The development of favorable reservoirs also influenced the enrichment of natural gases. A large amount of vertical fractures which extended directly to the earth surface were found in the front of the Longmen Mountain and on both sides of the Longquan Mountain. They destroyed the neighboring cap formations, and damaged the sealing capacity of the Jurassic sand bodies in the adjacent slope area. Effective traps were necessary for natural gas enrichment in Jurassic.关键词
气藏特征/气藏保存/输导体系/侏罗系/川西坳陷/四川盆地Key words
gas reservoir characteristics/gas preservation/migration system/Jurassic/Western Sichuan Depression/Sichuan Basin分类
能源科技引用本文复制引用
陈迎宾,王彦青,胡烨..川西坳陷中段侏罗系气藏特征与富集主控因素[J].石油实验地质,2015,(5):561-565,574,6.基金项目
国家科技重大专项“大型油气田及煤层气开发”之“中西部四大盆地构造演化对碎屑岩层系成藏富集的控制作用”专题（2011ZX05002－006－001）资助。 （）
