吐哈盆地北部逆冲构造带油气成藏模式与勘探方向

Hydrocarbon accumulation and exploration domain of northern thrust belts in Turpan-Kumul Basin

针对吐哈再生型前陆盆地北部山前逆冲构造带油气富集规律研究的需要,结合山前带不同块体构造发育特征分析与已发现油气藏解剖,提出山前带主要发育以走滑断裂体系为主、逆冲断裂为辅的断裂输导体系和与输导砂体相配置的构造脊2类输导体系,发育2种主控因素各异的油气成藏模式,即有走滑断裂发育的构造块体油气输导体系主要受控于走滑断裂及与其配置的逆冲断裂体系,缺乏走滑断裂发育的构造块体油气运移主要受控于与输导砂体相配置的构造脊。结合已有油气勘探发现过程分析,受走滑断裂控制的构造块体的油气扩展方向为构造高点靠近走滑断裂一侧的低断块,预探方向为逆冲断裂带下盘,油藏主体位于构造高部位;缺乏走滑断裂发育的构造块体油气预探方向主要为逆冲断裂带下盘,油藏主体位于逆冲断裂带下盘靠近生烃洼陷的部位。

To meet the need of regularity study for hydrocarbon accumulation of northern piedmont of superimposed regenerated foreland Turpan-Kumul Basin,combined the structure and discovered reservoir analysis of different blocks of northern piedmont,we proposed that there are two main types of conducting for petroleum migration system,which are the fault（mainly composed of strike-slip fault and thrust fault in second）and structural ridge conducting system and lead to two different hydrocarbon accumulation models on northern piedmont.The conducting system of block with strike-slip fault is mainly controlled by strike-slip fault and conjunction thrust fault;The block without strike-slip fault is mainly controlled by structural ridge and migration sand body.Combined the process of proved reservoir,the expand domain of blocks with strike-slip fault is the lower wing fault-blocks near the strike-slip fault and the exploration domain is the footwall of thrust fault,the main reservoir located at the high position of this type of block.The exploration domain of blocks without strike-slip fault is the footwall of main thrust fault,the main reservoir located at the footwall of thrust fault near source depression.