AVO技术在致密气藏储层预测中的应用  

Application of AVO in Prediction of Tight Gas-Bearing Reservoirs

作　　者：秦德文 高红艳 曹冰 刘创新 QIN Dewen;GAO Hongyan;CAO Bing;LIU Chuangxin(Shanghai Branch of CNOOC(China) Ltd.,Shanghai 200030,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200030

出　　处：《中国造船》2019年第A01期28-40,共13页Shipbuilding of China

摘　　要：东海油气田目的层埋藏深,为致密含气砂岩储层,首先介绍了AVO储层预测原理,通过地震正演模拟分析了含气性、孔隙度及砂岩厚度对AVO特征的影响,并总结截距和梯度属性的变化规律。运用存储滤波技术一步完成-90°相位转换和分频解释工作,得到相对泊松比属性体。以西湖凹陷中南部某中深层致密砂岩气田为例,分析了砂体的展布特征,优化了水平井水平段的位置。钻探结果证实了储层预测和沉积特征分析的可靠性,水平段实现了100%的砂岩钻遇率。The target zone of a gas field in the middle-south of the Xihu sag of the East China Sea has the characteristics of deep burial depth,serious heterogeneity,low porosity and permeability.In this paper,AVO attribute is used to predict the reservoir,First,the influence of gas permeability,porosity and sand thickness on the AVO is analyzed by seismic forward modeling,The variation characteristics of intercept and gradient attributes are summarized.Then using the stored filter technique to complete the-90°phase conversion and frequency division interpretation work for obtaining the relative Poisson ratio attribute for litho logy prediction.According to the relative Poisson's ratio attribute and result of strata slices distribute,the trajectory of the horizontal well is optimized.The drilled results confirm the reliability of reservoir prediction and sedimentary characteristics analysis,and the horizontal segment achieves 100%sandstone drilling rate.

关 键 词：致密气藏 AVO属性 存储滤波技术 储层预测 水平井轨迹 

分 类 号：TE132.2[石油与天然气工程—油气勘探]