关键词: 梁家楼地区, 浊积油藏, 沉积模型, 渗流模型, 剩余油分布, 水平井, 不稳定注水, 堵水

Abstract: The sedimentary features of infralittoral turbidite oil reservoir were studied, and the sedimentary models were reconstructed.In combination with flow seepage theory,a vadose model for the turbidite oil reservoir was established.The distribution patterns of residual oil were summarized.The study results show that there is a considerable potential of movable residual oil in the reservoir during the period of extremely high water-cut.The factors dominating the distribution of the residual oil include static barrier and dynamic potential of water. The residual oil is mainly concentrated in the top of normal-cycled sedimentary layer,normal microstructure,variation zone of facies,and regions of force balance and flow stagnation.According to the distribution features of residual oil,the oil concentration degree and actual oil development technology,a series of distinguishing technologies for enhancing oil recovery of reservoir with a high water-cut,including the technologies of horizontal well,unsteady water flooding and profile control,were developed. The notable results in increasing oil production and lowering water percentage have been gained,and the high recovery and recoverable reserve have been obtained by applying these technologies.The study and practice of turbidite oil reservoir during the later period of development of Liangjialou reservoir can provide the important bases for development of such oilfield in high water-cut stage.It also provides references for obtaining a good development effect,high recovery and large economic gain for the similar oil reservoir.

Key words: Liangjialou area, turbidite oil reservoir, sedimentary model, vadose model, residual oil distribution, horizontal well, unsteady water flooding, water shutoff