Fault System and Oil-gas Accumulation of Northern Slope Region of East Belt in Biyang Sag,Henan Province

The faults and fault systems are developed and complex in the northern slope region of east nose-like structure belt of Biyang sag. The develop and successive degree of fault controls the migration, accumulation and abundance degree of oil-gas reservoir. By research of the developed dimension, the successive degree of dominant fault and the relationship of oil-gas accumulation, the authors point out that developed dimension of the east-north directional dominant fault controls the distribution of oil reservoir. Matching relationship between the sand body spreading direction and the trend of dominant fault controls the abundance degree of oil-gas accumulation. And using this result guides the exploration of the region, newly defined B259 well has acquired 46 m~3 per-day high-productive oil flow; it may obtain extra 300×10~4 t newly increase oil in the place of this belt.