大庆长垣高台子地区扶余油层低孔渗储层地震叠前描述技术

大庆长垣高台子地区是近年储量提交重点目标区。扶余沉积时期以陆源河流相、三角洲相为主,砂岩厚度薄(一般小于5m),砂体规模小(300～600m),远小于地震极限分辨率,河道砂体识别是难题。针对存在的问题,以扶余油层河道砂体地震准确识别为目标,形成了以相对保持振幅与波形特征的高分辨率处理为基础,以优化叠加识别砂体、叠前AVO预测有效储层、叠前弹性参数反演检测油层为手段的扶余油层地震储层预测技术和流程。在研究区应用取得良好效果,曲流河点沙坝砂体得到清晰刻画,为该区寻找薄层岩性油气藏提供了可靠依据。共建议井位18口,已完钻10口,均见到较好的油气显示,试油9口,7口获工业油流,2口获低产,探井成功率达77.8%,是研究前成功率43.9%的1.78倍,较研究前有大幅度提高。

Prestack Seismic Descriptive Technique for Low Porosity and Low Permeability Reservoirs in Fuyu Oil Layer of Gaotaizi Area, Changyuan Tectonic Zone in Daqing Oilfield

Gaotaizi area has been a major target of Changyuan tectonic zone to submit reserves in recent years. Fuyu oil layer was dominated by terrigenous fluvial faces and delta at sedimentary stage. It has thin sandstone (less than 5m in general) and small sand bodies (300m~600m), which is far lower than the seismic limiting resolution. So it is difficult to identify river sand bodies. To solve the problem, taking accurate seismic identification of river sand bodies in the oil layer as the objective, a technique an...