Research on the types and characteristics of subtle reservoir formation in Banqiao sag

The fault depression structure developed well, and had deeper depression, wide slope, many faults, lots of unconformity and many kinds of sandstone body in Ban-qiao sag. Studying the relationship between various kinds of sandstone body and structural geology, the subtle oil -gas reservoir have been found, which can be classified three types and six kinds: sandstone pinch out reservoir, isolated sandstone reservoir, fault lithologic reservoir, slope belt stratigraphic overlap reservoir, palaeo geomor-phology reservoir, complex reservoir. This article has also analyzed the characteristics of each subtle trap in Ban-qiao sag.