延长地区延长组储层非均质性特征

发布时间：2018-04-10 07:49

本文选题：延长组　切入点：储层非均质性　出处：《西安科技大学学报》2017年06期

【摘要】：为了研究延长地区延长组储层非均质性特征,通过宏观和微观2方面,根据测井资料、岩心观察、岩心分析化验资料、压汞测试等方法对影响储层非均质性的各项参数进行了讨论。研究认为,粒度分布的韵律性对纵向上储层非均质性具有一定的控制作用;粒度均一的部位物性较好,层理构造密度较大的层段物性较差,隔夹层越薄,分布范围越小,油气越容易发生垂向运移,隔夹层对油气在纵向上的分布起重要影响;层内非均质性可用渗透率变异系数、突进系数、级差等参数进行评价,层间隔层对流体运动起隔挡作用;储层砂体的平面连续性及物性是控制储层非均质性的重要因素,三角洲水下分流河道砂体构成了延长地区延长组含油砂体的基本骨架,主流方向上砂体呈条带状分布,砂体在所处的相带不同,表现出不同的连通性和非均质性;成岩过程中原生孔隙与后期改造形成的次生孔隙控制着油气进入储层的饱满程度。分析认为,延长地区延长组储层非均质性特征表现为粒度韵律、层理构造、隔夹层、渗透率、砂体几何形态、孔隙结构等因素的不均一性。
[Abstract]:In order to study the reservoir heterogeneity characteristics of Yanchang formation in Yanchang area, according to logging data, core observation, core analysis and laboratory data,The parameters affecting reservoir heterogeneity are discussed by mercury injection test.The results show that the rhythmicity of grain size distribution has a certain controlling effect on the reservoir heterogeneity in longitudinal direction, the physical property of the section with uniform grain size is better, the physical property of the section with higher stratigraphic structure density is poor, the thinner the intercalation is, the smaller the distribution range is.The vertical migration of oil and gas is easy to occur, and the intercalation plays an important role in the vertical distribution of oil and gas, the heterogeneity in the layer can be evaluated by the parameters of permeability variation coefficient, breakthrough coefficient, differential, and so on, and the interval layer acts as a barrier to the fluid movement.The planar continuity and physical properties of reservoir sand body are important factors controlling reservoir heterogeneity. The delta underwater distributary channel sand body constitutes the basic skeleton of oil-bearing sand body of Yanchang formation in Yanchang area.Sand bodies exhibit different connectivity and heterogeneity in different facies zones, and primary pores and secondary pores formed during diagenesis control the degree of fullness of oil and gas entering the reservoir.It is considered that the heterogeneity of Yanchang formation reservoir in Yanchang area is characterized by the heterogeneity of grain size rhythm, bedding structure, intercalation, permeability, sand body geometry, pore structure and so on.
【作者单位】：长安大学地球科学与资源学院;西安科技大学期刊中心;西北水利水电工程有限责任公司;
【基金】：国家自然科学基金(41140028)
【分类号】：P618.13

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