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Relationship between hydrocarbon bearing fluid and the differential corrosion of potash feldspar and albite:a case study of Baikouquan Formation in Aihu oilfield,Junggar Basin
Author(s): 
Pages: 1381-1393
Year: Issue:  11
Journal: Acta Petrolei Sinica

Keyword:  potassium feldsparalbitedifferential corrosionhydrocarbon bearing fluiddissolved poreBaikouquan FormationJunggar Basin;
Abstract: 钾长石和钠长石差异溶蚀及与含烃类流体的关系和成储效应是储层地质学与矿物学研究中有争议的科学问题,以准噶尔盆地西北缘艾湖油田下三叠统百口泉组为例,对该问题进行了探讨.首次在储层中发现了钾长石和钠长石的差异溶蚀现象,即钾长石溶解,而钠长石不溶解,甚至次生加大.这种差异溶蚀具有与含烃类流体密切相关的层间差异性,自下而上百口泉组一段—百口泉组三段,随含烃类流体丰度逐渐降低,钾长石溶蚀(钠长石不溶/次生加大)强度逐渐减弱.这种正相关性的原因在于,与油气充注相关的酸性流体促进了钾长石溶蚀,并且百口泉组一段—百口泉组三段,烃类充注强度不断减弱,从而导致了钾长石溶蚀程度不断降低.因此,这一差异溶蚀过程指示了酸性的含烃类流体与岩石相互作用强度,并产生了次生孔隙,改善了物性,指示研究区玛18-艾湖2井区的上倾位置具有勘探远景.
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