Artificial gas cap and edge water two-way drive development reservoir screening and evaluating method for fault block oil reservoir

Abstract

The invention provides an artificial gas cap and edge water two-way drive development reservoir screening and evaluating method for a fault block oil reservoir. The method comprises the following steps: (1), developing fine strata comparison and structural interpretation of a candidate fault block oil reservoir, establishing a reservoir geologic model, and determining a reservoir parameter; (2), establishing a reservoir numerical model, developing development history fitting, and correcting the reservoir geologic model and the reservoir parameter; (3), analyzing the potential of increasing the reservoir recovery ratio through two-way drive, and demonstrating the necessity of developing two-way drive development; and (4), judging whether the candidate fault block oil reservoir is suitable for two-way drive development or not according to the corrected reservoir parameter. By means of the artificial gas cap and edge water two-way drive development reservoir screening and evaluating method for the fault block oil reservoir, the problem that a screening and potential-evaluating method of a two-way drive development unit of a fault block oil reservoir having extra-high water-cut stage is undefined and nonstandard can be solved; and thus, the technical application effect of increasing the recovery ratio by developing two-way drive in the last period of development of the fault block oil reservoir and the development adjustment plan compiling level can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of fault-block reservoir development, in particular to a method for screening and evaluating the adaptability of fault-block reservoirs in ultra-high water-cut periods by using gas injection at the top to form an artificial gas cap combined with water injection at a low position to form side-water flooding and two-way flooding. Background technique [0002] Complex fault-block oil reservoirs in eastern China generally have the characteristics of large formation dip, low crude oil viscosity and certain edge water. In the development of this type of reservoir, the water flooding development method of dense top and thin side, low injection and high recovery is usually adopted. After many years of development, it has entered the stage of ultra-high water cut. In view of the small scale of the remaining oil enrichment area on the roof line of the structural high and the angle between the faults at this stage, dri...

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Problems solved by technology

However, compared with foreign reservoir conditions, domestic fault-block reservoirs have deficiencies in terms of reserve scale, oil layer thickness, and original oil-bearing height, etc., and there are large differences between units, most of which have no original gas cap, and are in the middle and late stages of development. High water cut, these factors all affect the development effect of artificial gas cap-edge water two-way flooding, therefore, two-way flooding technology is not suitable for all fault-block development units, it is necessary to formulate the screening conditions for two-way flooding development of fault-block reservoirs, for this reason we Research and invention of a fault-block reservoir artificial gas cap-edge water two-way flooding development reservoir screening and evaluation method, guide fault-block oil reservoir two-way flooding development unit screening and technical application, and solve the above technical problems

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