摘要
东海油气田低渗天然气资源量占比较高,储层改造是低渗-致密气开发的重要手段,地质和工程的双甜点区预测是储层改造成功的关键。首先针对研究区储层横向变化快的难点,自主创新了基于AVO分频滤波的储层预测技术,提高了储层的空间分辨率,得到砂岩的展布特征,并与基于叠前反演的孔隙度及含气性预测结果相结合,得到地质甜点有利区。然后通过基于井震结合的三维岩石力学预测技术,得到脆性指数展布特征,进而得到工程甜点有利区。最后通过耦合地质甜点和工程甜点敏感参数,得到储层改造(双甜点)有利区。根据这些结果设计了先导试验井的井轨迹,并指导压裂参数优化。该先导试验井实现了砂岩的100%钻遇率,顺利完成八级压裂作业,压裂效果与预测结果吻合较好,验证了这项技术的可靠性。
Low permeability natural gas resources account for a relatively high proportion in the East China Sea.Reservoir reconstruction is an important means of development of low permeability-tight gas.Prediction of so called double sweet spots in both of geology and engineering is the key to successful reservoir modification.We independently develop the reservoir prediction technology based on AVO frequency division filter to improve the spatial resolution of reservoir and get the distribution characteristics of sandstone,and together with the prediction of porosity and gas bearing based on pre-stack inversion,to get favorable geological dessert areas.Then,distribution characteristics of the brittleness index and favorable areas are obtained.Sensitive parameters of the geological dessert are coupled with the engineering dessert to obtain the favorable area of reservoir transformation(double dessert).According to the results,well trajectory of pilot test well is designed,which achieves 100%drilling rate of sandstone and successfully completes the eight-stage fracturing operation.The fracturing effect is in good agreement with the prediction result,which verifies the reliability of the technology.
作者
秦德文
刘创新
曹冰
高红艳
夏瑜
QIN Dewen;LIU Chuangxin;CAO Bing;GAO Hongyan;XIA Yu(Shanghai Branch of CNOOC(China)Ltd.,Shanghai 200030,China)
出处
《中国造船》
EI
CSCD
北大核心
2019年第4期261-269,共9页
Shipbuilding of China
关键词
分频滤波
储层预测
地质甜点
工程甜点
井位设计
tight gas-bearing reservoir
AVO(Amplitude variation with offset)attribute
stored filter technique
reservoir prediction
