Abstract：The discoveries in the hydrocarbon exploration in Member S1,Qingshui Sag,Western Liaohe Basin demonstrate a great potential.The Member S1 located in the center of Qingshui Sag is structural-lithologic and lithlogic beds,and characterized by thin inter-beds,which leads difficulties for reservoir predication.At same time,it is difficult to distinguish hydrocarbon boundaries from water boundaries due to complex water-oil relationship.To overcome the difficulties,we carry out reservoir prediction with the following steps.Firstly,a high-precision sequence stratigraphic framework is established with fine structural interpretation.Then based on this stratigraphic framework,inter-bed reservoirs are predicted with amplitude and frequency attributes.Finally,an oil-bearing area is depicted with the principle of poststack hydrocarbon detection.The Wells W 115 and W 128 proposed by our research have achieved excellent success with good new discovery.
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