The Study On Heterogeneity Of Reservoir Of Siii4- Siii10 In The North-east Of Lamadian, Daqing

Reservoir heterogeneity is the major internal factor that affect the oil, gas, water seepage and oil and gas recovery ratio. At the same time reservoir heterogeneity is also the problems we encountered in oil and gas exploration and development. The favorable side is it can cause the barrier in vertical direction, so that the fluid can be sealed better, then the reservoir is formed. While the negative side is that the horizontal permeability will change and disappear, bring difficulties to the exploration and development. Lu-phase reservoir is more evident at this point. Heterogeneity is caused by the geological structure, sedimentary facies change, as well as digenesis. The macroscopic heterogeneity characteristics of the reservoir in the study area include the heterogeneity characteristics of the plane, the characteristics in the layer and between the layers and the non-homogeneity characteristics of porosity and permeability. The main features of micro-heterogeneity, including the distribution of pores and throat, pore structure characteristics, direction of the clay and sand matrix arranged, etc.At first, the group of sand rock of Sâ…¢4-10 in Polymer Flooding Well which located in the north-east of Lamadian Oil Field is the purposes Layer researched. Anatomical knowledge of reservoir structure and river delta phase contrast method of reservoir are used to evaluation the reservoir. Also the logging data in close spacing is used to identify and classify the small layer and sedimentary facies. Compartment dissection and distribution characteristics of seepage barrier and the effects of reservoir heterogeneity caused by compartment dissection are also researched in study area.Then, in this article, the detailed description of reservoir heterogeneity is carried out. The research shows that the Interlayer heterogeneity in Sâ…¢4-7 is higher than Sâ…¢8-10; in the plane, the physical properties in different areas are different from each other in Sâ…¢4-7,while they are almost the same in Sâ…¢8-10.The obvious differences between the river channel and non-river channel in physical properties affect the distribution of remaining oil. The remaining oil in Sâ…¢4-7 mainly distributed in the area the permeability changed.At last, in the study of heterogeneity, the reservoir in the study area is divided into four different types of flow units, and three distribution forms of plane flow unit including Independent distribution pattern, flat joint type, and vertical compound are proposed. Combination the reservoir engineering method, remaining oil distribution in different flow units and the distribution of the same flow units in different parts are researched, revealed the internal relations between the mobile unit and remaining oil distribution, verify the correctness of the mobile unit effectively, and developed the preferred basis for decision-making for the next step.