The image above represents gas initially in place.

To compute for gas initially in place, five essential parameters are needed and these parameters are **drainage area (A), initial gas FVF (B _{gi}), initial water saturation (S_{wi}), porosity (φ) and thickness (h).**

The formula for calculating gas initially in place:

G = ^{43560Ah φ (1 – Swi)} / _{Bgi}

Where;

G = Gas Initially in Place

A = Drainage Area

B_{gi} = Initial Gas FVF

S_{wi} = Initial Water Saturation

φ = Porosity

h = Thickness

Let’s solve an example;

Find the gas initially in place with a drainage area of 44, initial gas FVF of 23, initial water saturation of 32, porosity of 18 and exponent of 14.

This implies that;

A = Drainage Area = 44

B_{gi} = Initial Gas FVF = 23

S_{wi} = Initial Water Saturation = 32

φ = Porosity = 18

h = Thickness = 14

G = ^{43560Ah φ (1 – Swi)} / _{Bgi}

G = ^{43560 x 44 x 14 x 18 (1 – 32)} / _{23}

G = ^{43560 x 44 x 14 x 18 (-31)} / _{23}

G = ^{-14972791680} / _{23}

G = -650990942.6

Therefore, the **gas initially in place **is **-650990942.6**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the gas initially in place.

To get the answer and workings of the gas initially in place using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 1,500 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Petroleum **under **Engineering**

Now, Click on **Reservoir Fluid Flow **under **Petroleum**

Now, Click on **Gas Initially in Place**** **under **Reservoir Fluid Flow**

The screenshot below displays the page or activity to enter your value, to get the answer for the gas initially in place according to the respective parameter which are the **drainage area (A), initial gas FVF (B _{gi}), initial water saturation (S_{wi}), porosity (φ) and thickness (h).**

Now, enter the value appropriately and accordingly for the parameter as required by the **drainage area (A)** is **44**,** initial gas FVF (B _{gi})** is

**23**,

**initial water saturation (S**is

_{wi})**32**,

**porosity (φ)**is

**18**and

**thickness (h)**is

**14**.

Finally, Click on Calculate

As you can see from the screenshot above, **Nickzom Calculator**– The Calculator Encyclopedia solves for the gas initially in place and presents the formula, workings and steps too.