陆西凹陷马北斜坡有效储层预测

The Prediction of Effective Reservoirs in Mabei Slope of Luxi Sag

陆西凹陷马北斜坡带发育2套有效储层:下白垩统九佛堂组上段(K1jfu)薄层砂体和九佛堂组下段(K1jfL)火山碎屑岩。针对K1jfu薄层砂体,由于储集层与上、下围岩速度差异较小,常规波阻抗反演难以识别,通过敏感性分析发现,深侧向电阻率测井曲线对薄层砂体响应敏感,利用曲线重构技术将深侧向电阻率拟合成声波时差,再进行波阻抗反演,提高了薄层砂体分辨能力,并精确雕刻出多个砂体。对于K1jfL火山碎屑岩,采用多属性分析、RGB颜色融合技术,刻画了火山碎屑岩的分布范围,并预测了裂缝发育区。利用研究结果进行井位部署和储量计算,获得了较好的应用效果,并建立了一套适合该区的有效储层预测技术,指导了辽河外围其他凹陷的储层预测。

There developed two effective reservoirs in Mabei Slope of Luxi Sag,such as the thin sandbody of the upper member(K1jf1)and the pyroclastic rock in the lower member(K1jf2)of Jiufutang Formation.Aiming at K1jf1 thin sand,because the difference of speed among reservoirs in the up and down surrounding rocks was very small,it was difficult to be identified by conventional impedance inversion,through sensitivity analysis,resistivity respond sensitivity to thin sand was found out through sensitivity analysis and by utilizing logging curve reconstruction technique,resistivity was synthesized to interval transit time,then impedance inversion was carried out,so as to achieve the ability to distinguish thin sand,and carve out many sands precisely.For K1jf2 pyroclastic rocks,multi-attribute analysis,RGB color fusion technology are used,the distributive range of pyroclastic rocks was depicted and the fracture development zone was predicted.The result is used for well deployment and reserves calculation,better results are obtained,and a set of effective prediction techniques suiting for this region are established,it provides a guidance for reservoir prediction in other depressions around Liaohe Oilfield.