浅谈推动油气“倒灌”运移的动力计算方法——以松辽盆地三肇地区扶杨油层为例  

Discussion on the Calculation Method of the Dynamics of Promoting Oil & Gas“Reversed Migration”——A Case of the Fuyang Oil Layer in the Sanzhao Area

作　　者：巨世昌 赵靖舟[1,2] 

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065

出　　处：《非常规油气》2014年第3期25-28,共4页Unconventional Oil & Gas

基　　金：西安石油大学优秀硕士论文培育项目

摘　　要：油气"倒灌"作为一种特殊成藏方式,需要特定的地质条件作为支撑。剩余压力可以作为推动油气"倒灌"的动力,广泛发育的断裂体系可以为油气运移提供通道。油气下排时浮力会成为运移的阻力,成藏动力必须大于浮力才能推动油气发生"倒灌"。松辽盆地三肇凹陷下白垩统扶杨油层为典型的"倒灌"式成藏,上覆上白垩统青山口组一段烃源岩生成的油气沿断裂下排成藏,动力是关键因素。利用生油增压计算模型结合盆地模拟技术,对松辽盆地三肇地区青一段烃源岩生烃时产生的理论最大剩余压力进行计算,结果表明在主成藏期明水组沉积末期青一段烃源岩生烃产生的理论累计剩余压力最大可以超过24MPa,能够为油气下排提供充足动力,"倒灌"发生的距离要大于之前的研究结果。Reversed migration is a special kind of hydrocarbon accumulation, which needs special geological conditions to occur. The overpressure can be a dynamic of ＂reversed migration＂, Extensive developed fracture system can provide chan- nels for hydrocarbon migration. Buoyancy will become a resistance while oil migrate downward to the underlying formation. When the dynamic become over the resistance, ＂reversed migration＂ occurs. Fuyang oil layers of lower Cretaceous of Sanzhao in Songliao Basin are typical ＂reversed migration＂ type accumulation, the covered Qingshankou Lower Cretaceous source rocks generated oil and gas reservoirs lined up along the fault, and the dynamic of migration is one of the key fac- tors. With oil source pressurized calculation model combined with basin modeling technology, the theoretical maximum re- sidual pressure in the Songliao Basin region Qingshankou Sanzhao hydrocarbon source rocks is calculated. Results show that in the late period of the Mingshui Formation deposition, the overpressure cursed by hydrocarbon generation of K2qnl can be more than 24MPa, which can provide enough power for ＂reversed migration＂, and the really distance of ＂reversed mi- gration＂ should be greater than previous research results.

关 键 词：三肇地区 “倒灌”运移 动力计算方法 生油增压 盆地模拟 

分 类 号：P618.13[天文地球—矿床学]