Layer-by-layer development method for complex fault-block thin oil reservoirs

Abstract

The invention discloses a stratification developing method for a complex fault block thin oil reservoir. The method comprises the steps that the structure of the oil reservoir to be developed and the magnitude of edge-bottom water oil reservoir energy are determined; on the basis of determining the structure, fine geological stratification is achieved, and development units are detailed to single sand bodies; on the basis of fine geological stratification, the reservoir properties of all the single sand bodies are evaluated, and the spacing layer distribution conditions and physical characteristics of all the single sand bodies are determined; on the basis of determining reservoir evaluation, the residual oil distribution law and residual recoverable reserves of all the single sand bodies are determined through development effect analysis; after the residual oil distribution law is determined, series of strata recombination boundaries of horizontal well deployment target layers and vertical well drilling reservoir are obtained by utilizing numerical simulation in combination with field experience; on the basis of determining the conditions, according to the stratification developing technology, well pattern overall planning and deployment are carried out, and the stratification developing scheme is complied. According to the stratification developing method, the usage degree of the oil reservoir reserves can be increased, the development effect of the oil reservoir can be improved, and the recovery efficiency of the oil reservoir is enhanced.

Description

technical field [0001] The invention relates to the field of oil field development, in particular to a layered development method for complex fault-block thin oil reservoirs. Background technique [0002] For complex fault-block thin oil reservoirs, it has the characteristics of complex geological conditions. The complex geological conditions of the complex fault-block thin oil reservoirs are generally manifested in the following: faults are developed on the plane; there are multiple sets of oil-water combinations in the vertical direction; layered pure oil reservoirs and massive edge-bottom water reservoirs exist simultaneously; Large, many layers, strong reservoir heterogeneity. Due to the complexity of the geological conditions of the complex fault-block thin oil reservoirs, it is difficult to find an ideal development method that can achieve the desired development effect. [0003] Taking the Lianhua Oil Reservoir in Block Lei 11 in the Leijia area of ​​the Liaohe Faul...

AI Technical Summary

Problems solved by technology

Due to the complex geological conditions of the complex fault-block thin oil reservoirs, it is difficult to have an ideal development method to achieve the desired development effect

[0003] Taking the Lianhua Oil Reservoir in Block Lei 11 in the Leijia area of ​​the Liaohe Fault Basin as an example, since 2004, the said reservoir has implemented a set of well pattern water injection development with a well spacing of 210 meters, relying on the construction of large-scale production capacity and the adjustment of horizontal and vertical injection-production systems. Some effects were seen at the beginning, but after 2008, the block development effect became significantly worse, and the annual oil production decreased by 1.5 to 2×10 4 The rate of tonnage has shrunk sharply, and the natural decline rate has reached over 25%. The large number of upper layers, strong heterogeneity and various types of reservoirs are the main factors causing the uneven production of reserves. How to effectively produce the reserves of each set of reservoirs is a problem that needs to be solved to achieve effective development of the reservoir

[0004] At present, there are many oil reservoirs of the same type as Block Lei 11 at home and abroad, and the problems they face are similar to those of Block Lei 11, and there is no effective development method to enhance recovery

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