The primary aim of this book is to understand the detail study and Development of Reservoir. The aim of the four volumes presented under the title: “An Oil and Gas Field Development Plan” is to provide the basics of the technology and construction involved in each of the four activities listed above in a condensed form, thereby allowing better interaction among the men and women. The introduction to Oil and gas field technology is also designed to help specialists in other fields, e.g.: information processing, law, economy, research, manufacturing, etc. This book is written as a stand-alone plan of Oil & Gas field given the complex nature of the reservoir and the inherent uncertainties, there is therefore a possibility that an amendment be made to this plan, depending on the outcome of further data gathering and understanding of the reservoir. The primary aim of the book is to present the basic physics of Reservoir engineering, using the simplest and most straightforward of Reservoir software’s. It is only through having a complete understanding that the engineer can hope to appreciate and solve complex reservoir engineering problems in a practical manner.