油源断裂油气富集有利部位的预测方法及其应用

Prediction Method of Favorable Position in Oil-Gas Accumulation around Oil-Source Fault and its Application

为了研究含油气盆地下生上储式生储盖组合中油气分布规律,在油源断裂油气富集有利部位及其影响因素研究的基础上,通过确定油源断裂输导油气的有利部位、砂体相对发育部位和伴生微幅度鼻状构造发育部位,将三者叠合建立了一套预测油源断裂油气富集有利部位的方法,并将其应用于渤海湾盆地冀中坳陷廊固凹陷大柳泉地区旧州断裂6条分支断裂油气富集有利部位的预测中。结果表明:旧州断裂6条分支断裂发育4处油气富集有利部位,其中F_1和F_2断裂各发育2处油气富集有利部位, F_3、F_4、F_5、F_6断裂不发育油气富集有利部位, F_1和F_2断裂发育的4处油气富集有利部位有利于油气在沙三段中下亚段大规模聚集成藏,与目前旧州断裂附近沙三段中下亚段已发现油气分布相吻合,表明该方法是可行的。

A method is established to predict the favorable position of oil-gas accumulation for the lower source and upper reservoir type in petroliferous basins,on the basis of study on the favorable position in oil-gas accumulation and its influence factors,through determining the favorable position in oil-source fault transporting oil-gas,relatively favorable position in sand body and associated micro scope of nose structure.The method is then applied in the prediction of favorable position in oil-gas accumulation around six branches of the Jiuzhou fault in the Daliuquan area of Langgu Sag,Jizhong Depression of Bohai bay basin.The results indicate that there are four favorable positions for oil-gas accumulation related to the Jiuzhou fault,each of F1 and F2 faults controls two favorable positions for oil-gas accumulation,whereas the other four branches,such as the F3,F4,F5 and F6 faults have no favorable position for oil-gas accumulation.The four favorable positions for oil-gas accumulation are promising for large-scale accumulation of oil-gas in the lower-middle part of Es^3,which is consistent with the discovered oil-gas accumulation around the Jiuzhou fault in the lower-middle part of Es^3.We therefore suggest that this method is feasible to predict favorable positions for oil-gas accumulation around oil-source fault.