尕斯库勒油田N1-N21油藏剩余油分布模式

Remaining oil distribution model of N1-N21 reservoir in Gasikule oilfield

尕斯库勒油田N1-N2^1油藏经过多年开采已进入中等含水阶段,寻找剩余油是油藏稳产增产的首要任务。根据尕斯库勒油田N1-N2^1油藏的取芯、测井、生产动态等多种资料,采用“单因素解析多因素耦合”的研究思路,在深入解析沉积微相、储层构型、储层非均质性、微构造、井网布置、注采关系等单个因素对剩余油的控制机理后,针对地下不同的情况,筛选出相应的优势控制因素,从多因素耦合的角度对尕斯库勒油田N1-N2^1油藏的剩余油分布进行了研究。总结出3种由多种因素共同控制的剩余油分布模式,对进入高含水期油田剩余油的开采有重要意义。构造起伏明显时,沉积微相微构造封闭断层注采关系的控油模式是主要的剩余油分布模式,储层构型平面非均质性井网部署的控油模式则适用于构造平缓的部位,而储层构型夹层韵律性注采关系的控油模式是纵向上剩余油分布的主要模式。

After years of mining,N 1-N2^1 reservoir in Gasikule oilfield has entered the medium water content stage so remaining oil discovery is the key to stabilize and increase production.According to the coring,logging and production performance data of Gasikule oilfield N 1-N2^1 reservoir and analysis of control mechanism of remaining oil of each factors,such as sedimentary microfacies,architecture,heterogeneity and micro-structure of the reservoir and well network the philosophy of"single-factor analysis multi-factor coupling"is applied to the discovery.Aiming at different situations underground three superior control factors are sort out and three kinds of control model of the remaining oil distribution are summarized.They are important to mine the remaining oil.When the structural fluctuations is evident the remaining oil should be explored in the sedimentary sub-facies-micro-structure-sealing fault-relation of injection and mining oil control model;when the structure is gentle the remaining oil is generally accumulated in the model of reservoir configuration-plan heterogeneity-well net layout;reservoir configuration-interlayer-rhythm-relation of injection and mining model is suitable to explore the remaining oil vertically.