In order to meet the requirements of oilfield production in the late exploration period, fine tectonic units are divided in Xingbei district, by means of regional seismic data, dip variation and three-dimensional structure. Based on the condition that the position of anticlinal axis is accurately located, the Xingbei district has been divided into four tectonic units, including northwest slope area,southwest slope area, central anticline belt and east gentle slope belt. This classification can reasonably explain the hydrocarbon accumulation characteristics in Fuyu oil reservoir, so it is of great importance for petroleum geology in the following four aspects: ①northwest slope area tends to develop mature hydrocarbon source rocks in northwestern area, its hydrocarbon migration direction is parallel to the fault strike, so this area is unfavorable for oil and gas accumulation; ② southwest slope area tends to be in high hydrocarbon expulsion intensity area in the southwestern area, its hydrocarbon migration direction is vertical to the fault strike, so footwall of reverse fault in this area is favorable for oil and gas accumulating; ③ the structure ridge of central anticline belt is the high speed passway for hydrocarbon, so the traps adjacent to oil resource on both sides can be the main petroleum accumulation region; ④ east gentle slope belt is far away from the oil resource, with no migration passway, so this area can’t accumulate hydrocarbon. On the basis of those features, the well placement can be designed differently in various areas to reduce the risks of exploration.