Log Evaluation : Preface

PREFACE

Measurement in well log can divided into 4 categories :

1. Drilling Operation Log : mud logs, MWD (Measurement While Drilling), LWD (Logging While Drilling)
2. Core Analyze
3. Well log with wireline : electric, accoustic, radioactive, electromagnetic
4. layer production test

Because of technically or economically, not all of measurements applicated in each well. For example, picking up core and LWD system need huge cost than others.

The main purpose of formation evaluation are :

1. Identify reservoir
2. Estimate hydrocarbon reserves
3. Estimate hydrocarbon gains

LOGGING PROCESS

In exploration wells, It's important to gain information as much as possible continuously, in order to obtain a better observation of geological structure to correlating with the others well while oil field is on developing.

It's easily achieved with logging operation on openholes that started from maximum depth (TD) in to casing shoe. Do logging at short interval to avoid opennes formation layers toward mud system.

Logging operations have to done as fast as possible, but datas quality is more important. On final logging operation in Total Depth, important decisions will made based on logging, and it is determine the fate of well. And then you have to make some interpretations manually or with computer named Field Log Interpretation center (FLIC).

Log Evaluation : Preface - Source : Harsono, Adi. 1994. Pengantar Evaluasi Log. Jakarta