二连盆地阿南凹陷气藏地震特征

SEISMIC CHARACTERISTICS OF THE GAS RESERVOIR IN A'NAN SAG OF ERLIAN BASIN

阿南凹陷位于二连盆地马尼特坳陷东部 ,是盆地的主要含油气远景区。阿南凹陷阿尔善构造上的多口钻井在腾二段砂层组中均见到工业性油气流。为此 ,充分利用三维地震资料 ,并结合钻、测井资料 ,运用地震正演模型的方法详细讨论了气藏的地震特征及其形成的地质背景。地震正演模型表明 ,气藏的地震特征与其所处的构造位置、构造面积、断裂的发育程度、含气砂岩的厚度及泥岩夹层等有着密切关系。根据气藏的地震特征预测 :区内阿 45 1、阿 3、阿 40 2、阿 45 4等断块由于所处构造位置高、面积大且砂岩发育 ,其气藏地震剖面的特征清晰 ,属于有利的含气区 ;阿 414、阿 18与阿

A'nan Sag is located in the east part of Manite Depression in Erlian Basin, Being the major hydrocarbon potential area in the basin. Commercial oil and gas flow was found in the sands of the second member of Tengge'er Formation in many wells drilled in A'ershan structure in A'nan Sag. For this reason, by full applying 3-D seismic data and in combination with the drilling and logging data the seismic characteristics of gas reservoir and the geological background of forming them are discussed in detail by use of seismic forward model method. By means of seismic forward model it is shown that the seismic characteristics of gas reservoir are closely related to its structural location, the structural closed area, the degree of fault growth, the thickness of gas-bearing sands and the muddy intercalation, etc. According to the seismic characteristics of gas reservoir, it is predicted that in this region, the Fault Blocks A451, A-3, A-402 and A-454 are the beneficial gas-bearing areas because of high structural location, large closed area and thick sand as well as clear gas reservoir character in seismic sections; and the Fault Blocks A-414, A-18 and A-1 are the potential gas-bearring areas.