Abstract: A set of NNW strike-slip fault belts has been found in Baikouquan oilfield, Karamay area. The Karamay-Wuerhe great fault of NE trend was truncated into ten more pieces by this fault. Its 3D seismic horizontal slices clearly display that each wave group appears such event ends as directional linear extension, the event image is dragged, the same event waveforms are apparently dislocated and suddenly changed, and a suit of waves is abruptly bended in a same direction. Its seismic profile shows that the Mesozoic waves disappear suddenly and joint with messy reflection of Carboniferous basement, the waves appear interrupted points with high-angle extending down deep, the waves vary in undulance or the reflections become obscuring suddenly, etc. It is concluded that this strike-slip fault is in tensoshear property and should be lagging products associated with reverse fault of NE trend. The oil-enriched blocks accord generally with this developed fault belt, indicating its contribution is mostly constructive to hydrocarbon accumulation in Baikouquan oilfield.

Key words: strike-slip fault, 3D, horizontal slice, tenso-shear property, hydrocarbon accumulation, constructiveness, Baikouquan oilfield