【摘要】 利用三维地震反射层的特点、沉积地层厚度的变化、油井产能的突变、地层压力系数与地层倾角的差异等参数确定了柴达木盆地西部地区Ⅻ号断层的存在,并通过构造演化分析确定了该断层的性质。柴达木盆地西部地区跃进一号构造与砂西构造之间的Ⅻ号断层早期为受拉张作用控制的正断层,后期演化为受挤压作用控制的逆断层;断层开启时是油气的运移通道,而封闭时使跃进一号构造与砂西构造形成了各自独立的油水系统,在开发过程中必须采取相应的措施才能达到稳产与提高产能的目的。更多还原

【Abstract】 According to the strata parameters such as characteristics of three-dimensional seismic reflection,variation in thickness of sedimentary formation,abrupt capacity of oil well,and differences of formation pressure coefficient and dip angle,the existence and the property of No.Ⅻ fault in the west part of Qaidam Basin were investigated by analyzing the structural evolution. The result showed that No.Ⅻ fault existed between Yuejinyihao and Shaxi structures in the west part of Qaidam Basin.This fault was a normal fault resulted from extension in the early stage and then turned into reverse fault under extrusion.The fault was the oil-gas migration pathway when it was open.The independent oil-water system formed in Yuejinyihao and Shaxi structures when the fault was sealed.Because of existence of this fault,necessary steps should be taken to stabilize oil well yield and improve well deliverability during the development of Yuejinyihao and Shaxi oilfields.更多还原