Abstract:

hydrocarbon accumulation，oil and gas distribution in the Nanpu sag are mainly controlled by the following factors.  Firstly，source rocks have controlled the distribution areas of hydrocarbon reservoirs.  The study located in the place which is within 15 kilometers from shows more than 80% of hydrocarbon reservoirs have expulsion center.Secondly the favorable sedimentary fades have controlled the sand distribution and reservoir propertiesthe lays of hydrocarbon reservoirs and their scales.  Finally，faults are the most important factor controlling hydrocarbon reservoirs' distribution. On the one hand faults have controlled thetrap types and their spatial distribution，further,  the  size  and  location  of  hydrocarbon  reservoirs. On the ether hand,as channels for hydrocarbon's vertical migration，faults control their vertical migration distance.To sum up,the hydrocarbon distribution of the Nanpu sag is under the controlling effects of the combination of source rocks,sedimentary facies and faults.The deltas near the source rocks , channel sands and the fault zones interconnecting vertically are favorable exploration areas.

Key words: Nanpu sag, feature of hydrocarbon distribution, main controlling factor, fault, source rock