渤中25-1地区油气运移的输导通道及其示踪分析

渤中25-1地区是渤中坳陷重要的含油气区,具有复杂的构造演化与沉积充填史,输导通道一直是该地区成藏动力学研究的关键.采取宏观与微观相结合的研究思路,在理清研究区构造演化、沉积充填及其油气地质特征的基础上,讨论了油气运移的输导通道并对其进行了示踪分析,进而总结了该区的油气成藏模式.研究表明,长期继承性活动的基底断层是油气垂向运移的主输导通道,原油性质及地层水化学特征证实了断层的输导作用.上新统明化镇组和渐新统沙河街组渗透性储层是油气侧向运移的主要通道.沙河街组油藏具有自源压控侧向运移成藏的特点,明化镇组油藏具有它源断控垂向运移成藏的特点.

Hydrocarbon Migration Pathways and Their Trace Analysis in the BZ25-1 Area

The BZ25-1 area, an important petroleum district in Bozhong Depression, holds a complex history of structural and depositional evolution.Pathways all along are difficult to study in petroleum accumulation dynamics in this area. Based on the analysis of regional and petroleum geological characteristics of this area, this article discusses hydrocarbon migration pathways and their trace, and summarizes the model of petroleum accumulation through macro- and micro-method. Long-term active successive fault acts as the main vertical migration pathway, which has been confirmed by the properties of crude oil and chemical features of the formation water. The infiltrative sand body of the Minghuazhen Formation and Shahejie Formation can serve as the main lateral migration pathways. At last, the article summarizes the characteristics of native source, overpressure controlling and lateral migration in the Shahejie petroleum systems, and the characteristics of exotic source, fault controlling and vertical migration in the Minghuazhen petroleum system.