库车坳陷迪北致密砂岩气藏油气分布特征及聚集机理  

Hydrocarbon Distribution and Accumulation Mechanism of Dibei Tight Sandstone Gas Reservoir in Kuqa Depression,Tarim Basin

作　　者：刘立炜[1] 孙雄伟[1] 赵英杰[1] 金江宁[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《新疆石油地质》2016年第3期257-261,共5页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05046-03)

摘　　要：根据库车坳陷迪北气藏的试油、储层裂缝发育程度和天然气组分分析等资料,重新认识了迪北气藏的分布特征和聚集机理。结果表明:迪北气藏是介于圈闭型和连续型致密砂岩气藏之间的一种过渡型气藏,天然气主要分布于圈闭及其附近,且分布不是连续的;扩散不是迪北气藏的主导排气机理,烃源岩生成的气向储层选择性注入,注入点的选择可能与储层的裂缝发育程度有关,天然气以游离态沿注入点向邻近储层连续充注。基于特殊的成藏特征,把迪北气藏单独划分为复合型致密砂岩气藏,其勘探思路与圈闭型致密砂岩气藏相似。Based on the data from formation testing,fracture development degree and natural gas component analysis in Dibei gas reservoirin Kuqa depression of Tarim basin,the hydrocarbon distribution and accumulation mechanism are re-recognized.The results show that Di-bei gas reservoir is a transitional one between trap-type and continuous tight sandstone gas reservoirs.Natural gas is mainly discontinuouslydistributed in and around the traps.Diffusion is not the dominant mechanism of gas transport.Gas generated from source rocks flows into res-ervoirs selectively and continuously fills the neighboring reservoirs in free state along charging points which may be related to fracture devel-opment degree in the reservoir.Dibei gas reservoir is classified as a kind of composite tight sandstone gas reservoir according to its specialaccumulation features.The similar method for exploration of trap-type tight sandstone gas reservoir can be adopted for Dibei gas reservoir.

关 键 词：库车坳陷 迪北气藏 侏罗系 阿合组 致密砂岩气藏 油气分布特征 聚集机理 

分 类 号：TE122.2[石油与天然气工程—油气勘探]