This book unveiled that the integration of 3-D seismic data and well log data in reservoir assessment is of vital role in field optimization and evaluation in hydrocarbon recovery and good understanding of the reservoirs architecture is paramount in reservoir studies as clearly delineated using integrated seismic variance edge. Mitigation of drill loss has been ascertain using this apply method and reservoir target can be approved from appraisal to development stage as detailed reservoir properties has been ascertain.