塔河油田不整合结构类型及输导演化研究

塔河油田受多期构造运动变形叠加，形成了中～下奥陶统顶面、奥陶系顶面、东河塘组顶面和古生界顶面等四期主要不整合面。不整合面的微观结构为典型的“三层结构”，其中底砾岩中连通孔隙和半风化岩石中的卸荷～风化裂缝系统，是构成不整合面侧向油气输导的双重通道。同时，根据不整合界面上、下地层岩性、渗透性，以及接触关系，识别出八种结构类型，其中Ⅰ型和Ⅴ型对油气运移最有利，并详细分析研究区不整合面平面展布特征和空间演化过程，讨论其继承性和差异性，指出T7^4和T5^0不整合面是油气侧向运移、调整，并最终成藏的重要输导通道。

The unconformity type and hydrocarbon migration research in TAHE oil-field

The Ta He Oil-field is a sub-order tectonic unit in the northern Tarim Basin. Controlled by several tectonic movements during the long geo-history,there are four main unconformities developed (the top surface of mid-low Ordovician T_7~4、the top surface of Ordovician T_7~0、the top surface of Silurian T_6~0 and the bottom surface of Triassic T_5~0) in work area and can be divided as four types according to the seismic reflection termination. The unconformities present as concordance denudation in uplift area and as onlap- denudation in slope area. The microstructure of unconformities is typical "three-layer structure", in which the interconnected pores of basal conglomerate and loading off-weathering network of fracture of decayed rock are the dual passage for the broadside migration in unconformities. Meanwhile, according to the formation lithology、permeability and contact relationship, this research has identified eight types of unconformities, and the I and the V type are most favorable for the migration of petroleum. The research also analyze the through going character and spatial evolution of unconformities and concludes their inherited and differential characters. Finally, by analyzing in detail the unconformities' evolution and petroleum migration model, the paper finally points out that the T_7~4 and T_5~0 are the most important passage for the migration、modifying and accumulation of petroleum.