How to change/improve oil cumulative trend using global history matching?

[catapam]

Hi,

I am working on a mature field with long production history. The field has good homogeneity, a very good permeability, natural water drive, gas cap drive and water injection. Oil is around 6 cp with around 50 initial GOR.
Wells are perforated at lower layers and as soon as are flooded the old perf is cemented and a higher interval is open.

The field was reasonable matched 7 years ago.
I took-over this project and I update observed data. I notice that simulated oil cumulative has a less bend shape than observed oil cumulative.
In other words simulator overestimate latest oil production.

It is required for me to do a fast global HM in order to test some prediction scenarios.
I tried until now to play with PV multiplier and Relative permeability.
I am successful in matching the end oil production while operate those changes but I am producing less cumulative than observed.
Any tips about what I can do to improve the global mach, before going well by well?

Thank you,

[DAH7542]

Take a look at this chart:

[catapam]

@DAH7542

Thank you for the answer but I cannot download the attachment.
I am just redirected to a blank page.
Can you uploaded again or sens it to me via e-mail.
I will contact you.

Thank you

[catapam]

@DAH7542

Thank you for the answer but I cannot download the attachment.
I am just redirected to a blank page.
Can you uploaded again or sens it to me via e-mail.
I will contact you.

Thank you

[DAH7542]

Here I upload the info again. This time it might work fine.