| Complex fault block reservoirs occupy a large proportion in various types of reservoir in China,whose geological reservoir and annual oil production account for about a third of the total.The current development of complex fault block oil reservoir has been developed into the stage with high water cut and high recovery degree,and the remaining oil distribution is relatively complex.The remaining oil distribution affected by fault,structure,well pattern,has a characteristic of sporadic and local enrichment,with a larger tapping potential.Therefore,under the circumstances of lower oil prices,accurately predicting remaining oil distribution of complex fault block reservoir to reduce the development cost of oil and gas,has a great significance to improve business efficiency.The remaining oil distribution has been researched in main controlling factors,fine reservoir description.Based on research results from the early tectonic interpretation,stratigraphic correlation,the secondary logging interpretation,sand body characterization and so on,carried out reservoir geological modeling research of Kexia formation in H-18 oilfield using random plus deterministic modeling methods.By establishing a numerical model,carried out residual oil distribution study.Based on the characteristics of complex fault block oil reservoir,in accordance with the principle of differential development,studied the countermeasures for trapping the remaining oil.The main oil distribution of Kexia formation in H-18 oilfield is controlled by fault,structure and lithology,which is scattered.The type of remaining oil distribution can be divided into five kinds,including poor layers,imperfect injection-production,retention area,interlayer interference,water flooded.And five major potential layer were determined.Integrated application of reservoir engineering theory analysis,field of mathematical statistics and numerical simulation method,the optimal parameters have been determined of Kexia formation in H-18 oilfield.Based on the above research results,four adjustment scheme has been designed and three main directions to improve recovery efficiency has been determined,including drilling new well in peripheral reservoir,adjusting production parameters of old well,and injecting polymer in H48 fault block. |
