摘要
迪那2气田位于塔里木盆地库车坳陷秋里塔格构造带东部,是上第三系吉迪克组膏盐岩塑变层之下呈串珠状分布的一系列褶皱中的一个局部构造,含气层系主要为下第三系砂岩。该构造天然气中甲烷含量86.7%～88.9%,属于湿气;有机地球化学研究证实该构造气源主要为侏罗系煤系地层。迪那2号构造成藏期晚(构造雏形形成于晚第三纪库车期,定型于第四纪)和良好封盖条件(上第三系吉迪克组巨厚的膏盐岩和泥岩是区域盖层)是迪那2大气田得以保存的根本原因。迪那2气田的异常高压是由于从更新世开始来自北部的强烈构造挤压作用而形成的。迪那2气田探明和控制天然气地质储量大于1000×108m3,凝析油地质储量超过800×104t。
Dina 2 gas field is situated on the eastern side of Qiulitage structure belt,Kuche depression. It is one of the local structure under the plastic deformation layer salt\|section of Jidike formation,Neogene. Paleogene sand is the major bearing gas layer.The content of CH4 in natural gas is about 86.7%~88.9%. It's wet gas.Organic geochemical research proved that gas source is mainly from Jurasic coal\|bearing series.The rudiment of Dina 2 structure came up into being in Kuche period, late Tertiary, and the structure stopped in Quaternary. It's late accumulation.The large thickness saline rock,gypsite and mudstone of Jidike formation, Quaternary,is the territorial capping bed.The territorial capping bed and late accumulation are the key reasion of the preservation of Dina2 gas field.The abnormal high pressure is caused by the strongly structural compression from the north side began in Pleistocene. Geological reserves of Dina 2 gas field proved and controlled is more than 100 billion cubic metre.
出处
《天然气地球科学》
EI
CAS
CSCD
2003年第5期371-374,共4页
Natural Gas Geoscience
关键词
迪那2气田
下第三系
异常高
库车坳陷
Dina 2 gas field
Paleogene
Abnormal high pressure
Kuche depression.
