大慶長垣杏76區(qū)塊扶余油層斷裂特征及控藏作用

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Abstract： The aim of this work is to characterize complex fault characteristics accurately and clarify the reservoircontrolling effectof active faults during the inversion period on the Fuyu oil layer.This isachieved by investigating the geometriccharacteristics and activityofthe faults in theFuyu oil layer inthe Xing 76block，located in the midle ofthe Daqing placanticline，using fault-relatedfold theory，the fault growth index，aswellas the balancedsectionand fault displacement-buried depth curve methods based on 3Dseismic structural interpretation.The controling effect of faultsonhydrocarbonmigrationand accumulation isdiscussed throughtheanalysisofoil sourceconditions，tectonic stress field，reservoir profiles，and the shale gouge ratio.The results show that （1） the faults are welldeveloped as dense Zones with diferent sizes，which are dominated by steep and smal-scale faults; they are almost normal faults. Theycut different strata longitudinally， their strike is mainlyNW-and NNE-trending，and they often tun or intersect. （2）There were normal fault activities during the deposition periods of the third and fourth members of the Quantou Formation，Qingshankou Formation，and Yaojia Formation，and the first and second members of theNenjiang Formation during thedepresion period.Wealso findthere were reverse faultandreverse-translational fault activities during the end of the depositionofthe Nenjiang Formation and Mingshui Formation during the compresion inversion period that took place in the Paleogene.The large faultsshow strong activityand most of them exhibit vertical segmented growth characteristics.（3）Most of the faultson the edge ofthe fault dense Zones and a fewof the faults insidethe fault dense Zones underwent obvious activities during the inversion period，and they have their own advantages in terms ofoil andgas transportation.（4）Finally，theoilandgasin theFuyu oil layerismainly concentrated in the southwest slope ofthe studyarea due to strike transport along the NWand NNWfaults，and the sealing of antithetic normal faults or transverse fault dense zones.

KeyWords：Fuyuoil layer；fault activity；structural evolution；fault controlled reservoir；transporting anc sealing

扶余油層致密砂巖儲層是近年來松遼盆地增儲上產(chǎn)的重要勘探目標之一。（剩余24251字）