松辽盆地南部大情字井地区层序地层及隐蔽油气藏预测

Sequence Stratigraphy Study and Subtle Oil and Gas Reservoir Prediction in the Daqingzijing Area of the South of Songliao Basin

应用大量钻井、测井和地震等资料,建立层序地层格架,分析了大情字井地区层序地层发育特征,总结出层序格架内油气藏的分布规律。统计结果显示,有48.2％的油气储存于低位体系域中,有26.8％的油气储于水进体系域中,而有25.0％的油气储于高位体系域中。低位体系域是隐蔽油气藏勘探的重要部位。在此基础上,重点对大情字井三维地震探区的高台子油层开展波阻抗反演和吸收系数处理,分析和总结了含油砂体的识别特征,预测了储集砂体和隐蔽圈闭油气分布的有利部位。

On the basis of a lot of wells and seismic data, this paper established the sequence stratigraphy framework, analyzed sequence characteristics in Daqingzijing area and summarized the occurrence of reservoirs in the sequence framework. Statistical results show that 48.2% of hydrocarbons are located in lowstand system tract, 26.8% in transgressive system tract and 25.0% in highstand system tract. Lowstand system tracts are the important target for the exploration of subtle reservoirs. On this basis, we conducted the wave impedance inversion and processed the absorptance coefficients of the Gaotaizi oil layer in the 3D seismic exploration area of Daqingzijing area, analyzed the characteristics of oil-bearingsandbodies identification, and predicted the favorable area of sandbodies and subtle traps for oil and gas distribution.