松辽盆地古龙页岩油人工油藏的动态模拟及预测  

Dynamic simulation and prediction for artificial reservoir of Gulong shale oil in Songliao Basin

作　　者：赵国忠[1,2] 王青振 刘勇[1,2] 尹芝林 匡铁[1,2] ZHAO Guozhong;WANG Qingzhen;LIU Yong;YIN Zhilin;KUANG Tie(Exploration and Development Research Institute of Daqing Oilfield Co Ltd,Daqing 163712,China;Heilongjiang Provincial Key Laboratory of Reservoir Physics&Fluid Mechanics in Porous Medium,Daqing 163712,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]黑龙江省油层物理与渗流力学重点实验室,黑龙江大庆163712

出　　处：《大庆石油地质与开发》2021年第5期170-180,共11页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究”(2021ZZ10)。

摘　　要：古龙页岩油为陆相原生原储型油气藏,发育微米孔、纳米孔和页理缝,大规模改造后形成了流体传输机制复杂的"人工油藏"。页岩油储层孔渗极低,常规实验方法很难获得准确的孔隙度、渗透率、饱和度、相渗曲线、压裂缝网参数等数据,目前,基于前期探评工作对储层性质和改造效果的认识,可把这种油藏看成一个灰箱系统,为精细描述各压裂段内流体输运机制,运用CMG软件建立了井A1的"一簇一网格"的单井地质模型,通过拟合稳定生产气油比的复配流体PVT实验数据,建立了体相流体组分模型。运用LS-LGR-DK裂缝刻画技术实现了人工主缝及改造次缝的刻画,探索了压实作用、气相非达西效应、纳米孔隙流体相态对产能的影响,在实现压裂液注入模拟的基础上,通过对典型井返排和生产历史的模拟拟合,反演了储渗性质、输运机制及参数,分析油气产量特征及影响因素,认识开发早期规律,预测了EUR(估算最终可采储量)。初步探索出了页岩油数值模拟方法和流程,研究成果为古龙页岩油开发设计优化提供了一定的支持。Gulong shale oil is a continental primary in-source reservoir,which develops micropores,nanopores and lamellation fractures.After large-scale stimulation,it has developed into an"artificial reservoir"with complex fluid transporting mechanism.Porosity and permeability of the shale oil reservoir are extremely low,so it is difficult to obtain accurate data of porosity,permeability,saturation,relative permeability curve and fracture network parameters by conventional experiment methods.At present,based on the understandings of reservoir properties and stimulation effects in previous exploration and evaluation works,this kind of reservoir is regarded as a gray box system.In order to finely describe the fluid transporting mechanism in each fractured interval,a"One cluster one grid"single well geological model for Well A1 is established by using CMG software.By means of matching PVT experimental data of compound fluid with stable production gas-oil ratio,the bulk fluid composition model is established.LS-LGR-DK fracture characterizing technology is used to characterize artificial dominant fracture and stimulated secondary fractures,and explore effects of compaction,gas-phase non-Darcy effect and nanopore fluid phase behavior on productivity.On the basis of fracturing fluid injection simulation and through simulation-matching of typical well flowback and production history,reservoir permeability properties,transporting mechanism and parameters are inverted,oil and gas production characteristics and their influencing factors are analyzed,development law in early stage is understood,and EUR is predicted.The research preliminarily explores the method and process of shale oil numerical simulation,and the study results provides support for development design optimization of Gulong shale oil.

关 键 词：古龙页岩油 人工油藏 流体输运机制 数值模拟 早期开发规律 

分 类 号：TE357[石油与天然气工程—油气田开发工程]