---
id: po.wb.mbe.black-oil-model
title: Material Balance — Expansion Terms
category: MBE
tags:
  - material-balance
  - expansion-terms
  - mbe
---

# Material Balance — Expansion Terms

## Purpose

MBE expansion terms (Eo, Eg, Efw) for a black oil reservoir with gas cap. Named input cells
for initial conditions. 9 pressure steps with PVT data and computed expansions.

## Plan

- [x] Inputs sheet with named cells
- [x] 9 pressure steps with PVT data and expansion calculations
- [x] Multi-series expansion chart
- [ ] Add F/Et Havlena-Odeh plot with production data
- [ ] Add drive index analysis