Step-by-step petrophysical interpretation in a carbonates field to understand high water production

I like to believe that depending on the specific needs and goals, each reservoir needs a customized characterization workflow. In the case presented in this post, the goal was to understand the reasons behind the high water production in 3 recent drilled wells:

  • Well 1: Decent initial hydrocarbons production followed by lots of water.
  • Well 2: Lots of water.
  • Well 3: Low rate – mainly water, some hydrocarbons.

In order to accomplish the goal, a step-by-step petrophysical characterization is presented including the following aspects: Lithology, Porosity, Water saturation, Permeability, Fractures and secondary porosity, and capillary pressure.

There are other aspects from different disciplines that could be integrated to this post, but I wanted to keep the emphasis on applied petrophysics.

Actions taken as a consequence of the findings described in this post added significant economic value to the project.

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How To Easily Read A Well Log in 5 Minutes Using ‘Six Ko Ko​ Rules’

How To Easily Read A Well Log in 5 Minutes Using ‘Six Ko Ko Rules’

By Dosh Nazlan, Petrophysicist.

Petrophysicists look at the well log patterns, recognize the trends, and then turn those patterns into reservoir knowledge.

Well logs can tell us many stories about our reservoir. Each colorful line, each curve deflection and each curve type create the story of our reservoir.

Each reservoir story is different from one another.

But for sure, every story begins the same way. The story starts when the oil and gas, trapped inside the reservoir for million of years, get very excited to come out.

Our main task is to figure out the right story by using well logs and other lab data to make the storyline better.

When we run well logs, these hydrocarbon pools tell us everything – where they are, how they look like and how much they are, so we know how to get them.

But before we understand any story, we need to be able to read these well logs.

My first mentor, Ko Ko Kyi, first taught me how to read and interpret well logs just by looking at the well log patterns. I want to share the same tips with you today.

It’s just a common sense, step-by-step approach in interpreting any well logs. But the results are magical.This is a technique I called ‘The Ko Ko Rules’.

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