库车拗陷东部侏罗系“连续型”致密砂岩气成藏条件分析  

Accumulation conditions for the continuous tight-sandstone gas in Jurassic,Kuqa depression

作　　者：袁文芳[1] 王鹏威[2,3] 秦红[1] 庞雄奇[2,3] 张博[1] 杜忠明[2,3] 邢星[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 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油大学(北京)地球科学学院,北京102249

出　　处：《东北石油大学学报》2014年第4期1-9,共9页Journal of Northeast Petroleum University

基　　金：国家重点基础研究发展计划(973计划)项目(2011CB201105)

摘　　要：有利的成藏条件是"连续型"致密砂岩气大规模聚集成藏的重要基础,明确成藏条件对于致密砂岩气藏理论研究和勘探实践具有重要意义.文中讨论库车拗陷侏罗系阿合组"连续型"致密砂岩气藏形成所需要的烃源岩、致密砂岩储层、盖层条件及构造条件.结果表明:下伏三叠系烃源岩为致密砂岩气藏的形成提供充足的气源,广泛分布的致密砂岩储层控制致密砂岩气藏在时间和空间的分布范围,致密储层上覆煤系地层与下伏泥岩为致密砂岩气成藏提供保护作用;后期的强烈构造活动,一方面促进地层快速沉降,有利于烃源岩快速演化,另一方面对致密砂岩气藏具有调整改造的作用,构造裂缝改善储层的物性,同时形成天然气散失的通道.因此,有利的源岩、储层、源储配置关系、盖层及构造活动是库车拗陷东部侏罗系"连续型"致密砂岩气藏形成的有利条件.As favorable conditions were an important basis for the continuous tight-sandstone gas accumulating in large scale,it is of great significance in both theory and practice to probe into these conditions.This paper discussed source rocks,tight gas reservoirs,cap rocks and structure factors that were needed for the continuous tight-sand gas reservoir in Jurassic Ahe formation,Kuqa depression.The results showed that source rocks in the Triassic supplied enough gas for the accumulation of the tightsandstone gas,tight sand reservoirs controlled the distribution of tight-sandstone gas both from the space and time,overlying coal and underlying shale protected the gas accumulation.Apart from these,dramatically structure activity in the later stage promoted the stratus being buried in a fast speed,which was beneficial for thermal evolution of source rocks and offering abundance gas.On the other hands,the structure activity played a significant role in adjusting the continuous tight-sandstone gas reservoirs,because fractures formed by structure activity could improve the physical property and formed the channel for gas losing.

关 键 词：“连续型”致密砂岩气藏 成藏条件 库车拗陷 侏罗系 烃源岩 

分 类 号：TE121.2[石油与天然气工程—油气勘探]