Research on Fault Controlling Petroleum Accumulation in Nanpu Sag

Abstract

This paper analyzed the factors controlling hydrocarbon accumulation associated with fault evolution, and pointed out favorable exploration directions by establishing pattern of fault controlling petroleum accumulation. Research showed that positive local structural belts were favorable positions for hydrocarbon accumulation; While the juxtaposition thickness of Ed₂ caprock was less than 90-95 m, hydrocarbon could penetrate the caprock and accumulate in middle-shallow layers; mode Ⅴ and Ⅵ fractures were oil source faults, intersected faults are the preponderant pathways of hydrocarbon vertical migration, hydrocarbon flowed to reservoirs with sand content of more than 20%; Strong fault sealing ability was necessary for hydrocarbons of injecting into fault trap to accumulate and be preserved; Positive local structural belts, which are related to mode Ⅴ and Ⅵ fractures, with caprock juxtaposition thickness of less than 90-95 m, high sand content and good fault lateral sealing ability, were oil exploration targets and directions of middle-shallow layers.

DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2543