高速灰岩屏蔽层下伏储层预测技术组合研究与应用  

Research and application of underlying reservoir prediction technology combination for high velocity limestone shielding layers

作　　者：刘志斌 解吉高 薛冬 肖曦 王迪 牛聪 焦振华 刘方 LIU Zhibin;XIE Jigao;XUE Dong;XIAO Xi;WANG Di;NIU Cong;JIAO Zhenhua;LIU Fang(CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028

出　　处：《中国海上油气》2018年第6期51-61,共11页China Offshore Oil and Gas

摘　　要：北海DG油田浅层广泛发育一套近千米厚的高速灰岩屏蔽层,下伏储层只能在近偏移距采集到弱反射地震信号,中远偏移距接收的是折射波、多次波和转换波的复合干扰波。提出了高速灰岩屏蔽层下伏目标储层成像和预测的处理反演一体化解决方案:通过井和地震层速度的一维二维波动方程正演模型确定储层上覆灰岩顶面的临界角;并制定原窄反射角中远角度倾斜干扰波压制处理方案,改进原窄反射角共反射点道集中远角度反射波成像质量;同时统计分析储层敏感岩石物理参数,认识到泊松阻抗属性是DG油田区最敏感的储层指示器。运用新处理宽反射角地震资料和原窄反射角地震资料进行叠前反演泊松阻抗对比,新发现了原先用窄反射角资料漏判的储层,指明了DG油田区下步勘探潜力方向,对其他地区高速块体下伏储层预测具有一定的参考意义。A set of high velocity limestone shielding layers with the thickness of nearly one thousand meters were widely developed in the shallow layer of the DG oilfield in North Sea.The underlying reservoir can only receive weak reflection seismic signals on near-offset traces,and the medium-far offset traces can record the composite interference waves of refracted waves,multiple waves and converted waves.An integrated solution to the processing and inversion of reservoir imaging and prediction under high velocity limestone shielding layers was proposed:the one-dimensional and two-dimensional wave equation forward models of well and seismic layer velocity data were used to determine the critical angle of the overlying limestone top surface;the suppression treatment scheme for the medium-far angular declination interference waves of original narrow reflection angle was formulated to improve the medium-far angular backward wave imaging quality of original narrow reflection angle common reflection point gather;at the same time,the reservoir sensitivity rock physical parameters were statistically analyzed,and it is recognized that Poisson impedance property is the most sensitive reservoir indicator in the DG oilfield.By using the newly processed wide reflection angle seismic data and the original narrow reflection angle seismic data,the pre-stack inversion Poisson impedance was compared,the reservoir indiscernible with the original narrow reflection angle data was identified,which provides guidance for the next step exploration in DG oilfield.This paper will provide reference for the prediction of reservoirs under the high velocity blocks in other regions.

关 键 词：北海DG油田 高速灰岩屏蔽 储层预测 波动方程正演 反射波临界角 多次波压制 中远角度道集 泊松阻抗属性 

分 类 号：TE132.14[石油与天然气工程—油气勘探]