次生孔隙带预测新技术在大庆西部外围的应用

New Prediction Technology of the Secondary Porosity Zone Appl icating in Daqing Peripheral Oilfield

压实作用和胶结作用使储层物性变差,而大气水淋滤作用和碳酸(HCO3-+CO32-)、有机酸等酸性流体的溶蚀作用都可以形成次生孔隙,使储层物性变好。当有机酸值高于1000m g/l时或者当HCO3-+CO32-值高于3000m g/l时或者某深度现今孔隙度大于其正常压实曲线公式计算的孔隙度时,次生孔隙度发育,根据这些门槛值,可以定量研究有机酸、碳酸和异常高孔的纵向和平面展布特征,从而预测次生孔隙带的分布;利用该方法,本文对大庆西部外围地区萨尔图油层、葡萄花油层、高台子油层以及扶杨油层的次生孔隙进行预测,预测区域和区内含油面积吻合的较好;薄片资料也佐证了本方法对次生孔隙带预测的可靠性。

compaction and Cementation can reduce the primary porosity,and meteoric water leaching,organic aid solution and carbonate solution can form secondary pore.When the content of organic aci is larger than 1000 milligram per lilite,carbonate larger than 3000 milligram per lilite,and the present porosity is larger than the porosity calculated with normal compaction curve formula,the secondary pore will appear.According to these threshold values,prediction of secondary pore zone can be quantitatively studied.Make use of this method,this paper predicted the secondary pore zone of Saertu oild layer,Putaohua oild layer,Gaotaizi oild layer,Fuyu oild layer in Daqing Peripheral Oilfield,The predict district and oil-bearing area is very alike,thin section analysis also gives convincing evidence for the predict district.