Interpretation of gas chimney volumes

Abstract

In this paper we describe how seismically derived gas chimneys can be used to determine hydrocarbon migration paths. The emphasis will be on how to interpret chimney cubes. Through several case history examples, we will show chimney cubes can reveal vertical hydrocarbon migration paths that can be interpreted from their source into reservoir traps all the way to the surface. We will highlight distinguishing features of chimneys for oil-prone versus gas-prone prospects, and those related to separating active fault migration pathways. Further, we will show chimneys can support charging of shallow reservoirs. Our understanding of the petroleum system can improve by combining gas chimney data with other information. As such a chimney cube can be seen as a new exploration tool.