库车再生前陆盆地的构造与油气

STRUCTURES AND HYDROCARBON ACCUMULATION IN KUQA REJUVENATED FORELAND BASIN

库车再生前陆盆地位于塔里木盆地的北缘 ,其沉积和构造特征具有典型的前陆盆地性质。盆地中三叠系、侏罗系烃源岩发育 ,具有多套储盖组合 ,是塔里木盆地重点勘探地区之一。研究表明 :(1)断层活动与生烃、排烃时期是否匹配是确定断层封闭性的关键 ,断层活动期 ,断面具有较强的输导能力 ,断层停止活动 ,断层对流体有较强的遮挡作用 ;(2 )断层相关褶皱是最有利的构造圈闭 ;(3)突破断层对油气藏主要起破坏或改造作用 ;(4)导油构造缺乏是深部勘探失利的关键。在构造与油气关系研究的基础上 ,确定库车再生前陆盆地中的北部背斜油气聚集带和拜城阳霞向斜北油气聚集带是目前最有利的勘探目标。

Kuqa rejuvenated foreland basin is located along the northern margin of Tarim Basin.The characteristics of sedimentation and structures are of typical foreland basin.The hydrocarbon source rocks of Triassic Jurassic and reservoir cap rock assemblages developed well in the basin,and it is one of the important exploration areas.It has been demonstrated by study that:1.the matching of faulting time and hydrocarbon generation and expulsion phase is the key of the fault sealing ability;2.fault related fold is the most favorable structural trap;3.break through faults mainly destroied or reformed hydrocarbon reservoir;4.the lacking of conductive structures is the key of the defeat of deep exploration.Based on the relationship between structures and hydrocarbon accumulation,the northern anticline hydrocarbon accumulation zones and the northern anticline of Baicheng Yangxia syncline hydrocarbon accumulation zones are most favorable exploration targets at present.