摘要
油气钻探结果表明,库车坳陷下第三系膏泥岩盖层发育,厚度为100～1000m,覆盖了库车坳陷大部分地区,是库车坳陷天然气聚集与保存的区域性盖层。微观封闭能力研究表明下第三系膏泥岩盖层不仅具有较其它各含油气盆地泥岩盖层更高的毛细管封闭能力,而且还具有较高的异常孔隙流体压力封闭能力,可对游离相和水溶相天然气形成较强的封闭作用,力学实验结果表明下第三系膏泥岩盖层具有较强的流变性,不仅可以塑性流动,保持其横向封闭的连续性,而且可以使断裂静止后迅速形成封闭,综合分析可以得到下第三系是一套高质量的天然气封盖层。
The drilling result of oil or gas indicates that gypsum mudstone caprock of Eogene system develops in Kuche depression. Its thickness is form 100m to 1000m; It overs most areas of Kuche depression, It is the regional caprock for gas to accumulate and preserve in Kuche depression. The study of Microcosmic seal ability indicates that gypsum mudstone caprock of Eogene system not only has stronger capillary seal ability than that of mudstone caprock in other oil or gas bearing basin, but also has high abnormal pore fluid pressure seal ability, can form strong seal ability to gas in free phase and water - dissolving phase. The result of mechanics experiment indicate that gypsum mudstone caprock of Eogene system owes strong rheological behaviour and not only can flow plastically and keep transverse seal continuity but also can make fault seal rapidly in static period. Comprehensive evaluation considered gypsum mudstone caprock of Eogene system to be a high quality caprock to seal gas.
出处
《新疆石油天然气》
CAS
2005年第1期6-11,共6页
Xinjiang Oil & Gas
关键词
库车坳陷
下第三系
膏泥岩
流变性
封闭性
Kuche depression
Eogene system
gypsum mudstone
rheological behaviour
seal
