分频重构反演及在薄互层储层预测中的应用  

Seismic Inversion of Frequency Divisions Reconstruction and Its Application Thin Interbedded Sand Reservoir Prediction

作　　者：赵继龙[1,2] 熊冉 陈戈 王俊鹏 刘玲利 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国石油杭州地质研究院,浙江杭州310023

出　　处：《西南石油大学学报（自然科学版）》2014年第4期47-54,共8页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2008ZX05004–002)

摘　　要：塔北隆起却勒—羊塔地区古近系底砂岩段发育一套扇三角洲前缘砂、泥薄互层储层,通过对薄互层储层的钻井岩芯、录测井分析,探讨了常规曲线分频分量的储层地质含义,优选了薄互层岩性敏感曲线和地层平均速度敏感曲线。在曲线预处理、标准化处理等前提下,利用小波分频分解的原理和方法,分频提取储层岩性敏感伽马曲线的中频分量和地层平均层速度敏感声波曲线的低频分量。统计回归,建立伽马曲线与声波曲线的转换模型,模型法将伽马曲线转换为声波曲线量纲。小波分频重构融合伽马曲线中频分量和声波曲线低频分量信息,构建具有声波量纲的拟声波曲线。利用拟声波曲线约束地震反演,提高地震频带宽度和地震资料分辨率,预测了薄互层砂岩的分布区,薄层砂岩主要分布于北部的QL1井和东部的YT5井附近。In Quele-Yangta Area of Tabei Uplift, the Palaeogene lower sand section is fan-delta front facie and the strati- graphic is sand-shale thin interbedded reservoirs. In this paper, we analyzed the core and logging of thin interbedded reservoirs, discussed the geology significance of the reservoir by different curve frequency division component, and optimized the thin interbedded reservoirs lithology sensitive logging and stratigraphic average velocity sensitive logging. On the basis of curve foreprocessing and normalization, we exteacted the middle frequency component of reservoirs lithology sensitive logging（GR）, and the low frequency component of stratigraphic average velocity sensitive logging （Dr）, with the principle of wavelet frequency division and decomposition. Based on the Statistic method of the statistic regression. Based on the method of the statistic regression, the transformation model with GR-DT curve was established, and this statistical model will converse GR curve to DT curve dimension. According to the technology of wavelet logging frequency division reconstruct, we construct quasi acoustic logging combined with the middle frequencies GR curves information and low frequencies acoustic logging information, which are extracted by wavelet decomposition. Using quasi acoustic logging constraint seismic inversion, the inversion methods can improve seismic resolution and frequency band, and the inversion impedance results predict the thin interbedded reservoir sand is mainly distribute in the north of the research area near Well QL1, and distribute in the east of the research area near Well YT5.

关 键 词：却勒—羊塔地区 薄互层储层 敏感性分析 分频重构 拟声波反演 

分 类 号：TE132[石油与天然气工程—油气勘探]