苏里格气田含气储层地震AVO特征  

Study of AVO attributes for gas-bearing bed in Sulige Gasfield

作　　者：苏海[1] 李宏伟 

机构地区：[1]西安石油大学油气资源学院,陕西西安710065 [2]东方地球物理勘探有限责任公司研究院长庆分院,陕西西安710021

出　　处：《西安石油大学学报（自然科学版）》2012年第3期21-24,28,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：陕西省工业攻关计划项目(编号:2009K10-15)

摘　　要：苏里格气田为上古生界碎屑岩系中的致密性砂岩气藏,有效的含气储层具有储层薄、横向变化快的特点,因此难以准确预测有效储层的分布.围绕研究区的地质问题以及储层沉积特点,通过AVO模型正演分析,反映出地震道集上的储层AVO特征,并利用叠前地震反演技术提取的各种地震参数,描述地层的岩性和含流体特征.研究表明:本区砂岩储层属于异常特征明显的第三类AVO异常类型,储层属于中低等产能储层;叠前反演得到储层界面的波阻抗差异非常小,纵横波速度和泊松比均为低值;有效地识别出含气储层的分布范围;通过叠前储层描述技术所优选的井位,取得了良好的钻探效果.Sulige Gasfield is lithologic gas reservoir,which belongs to the clastic rock of the upper Paleozoic.It is very difficult to accurately predict the distribution of effective reservoirs,because the effective reservoirs are thin in thickness and rapid in lateral variation.According to the geological problems and the reservoir feature in Sulige Gasfield,the AVO response on seismic record in the effective reservoirs was obtained using AVO forward modeling method.Several seismic parameters are extracted using pre-stack inversion method and they are used for describing the characteristics of reservoir lithology and fluid.The results show that the sandstone reservoirs have obvious characteristic of the third type of AVO abnormity.The reservoirs are of low-medium productivity.The small wave impedance difference,low ratio of P-wave to S-wave velocity and low Poisson's ratio are shown in seismic interface.The distribution range of the gas-bearing reservoirs is effectively identified by using pre-stack inversion method.The satisfactory drilling exploration result is achieved in the well location optimized by using pre-stack reservoir description technology.

关 键 词：含气储层 AVO 地震参数 井位优选 苏里格气田 

分 类 号：TE122.23[石油与天然气工程—油气勘探] P631.4[天文地球—地质矿产勘探]