Prospects delineation and evaluation using the CDP gathers characterization, onshore Nile Delta, Egypt

Abstract

In the last decade, the seismic AVO analysis have become prominent in the direct hydrocarbons indicator (DHI), aimed at characterizing the fluid content or the lithology of a possible reservoir and reducing the exploration drilling risk. This research discuss the impact of studying the common depth point (CDP) gathers on Near, Mid and Far-offsets, to verify the credibility of the amplitude response in the prospect evaluation, through analyzing a case study of two exploratory wells; one has already penetrated a gas-bearing sandstone as a reservoir and the other one is dry-sand, but drilled in two different prospects, using the amplitude versus offset (AVO) analysis, to understand the reservoir configuration and its relation to the different amplitude response. The results show, that the missing of the short-offset data is the reason of the false anomaly encountered in the dry sand, due to some urban surface obstacles during acquiring the seismic data in the field especially, the study area is located in El Mansoura city, which it is a highly cultivated flat terrain, with multiple channels and many large orchards on the edge of the river, and sugar cane and rice fields. Several lessons have been learned, which how to differentiate between the gas reservoirs and non-reservoirs, by understanding the relation between the Near and Far-offset traces, to reduce the amplitude anomalies to their right justification, where missing of Near-offset data led to a pseudo-amplitude anomaly. The results led to a high success of exploration ratio as the positives vastly outweigh the negatives. Keywords: CDP gathers, AVO analysis, Seismic attributes, Qawasim sands, Near-offset