高精度层序地层格架内的地震沉积学应用 ——以哈萨克斯坦南图尔盖盆地A区为例

来源期刊:中南大学学报(自然科学版)2010年第6期

论文作者:毛治国 樊太亮 凌宗发 孙伟 李小江 白斌 沈武显 蒋韧

文章页码:2296 - 2304

关键词:高精度层序地层;地层切片;分频技术;南图尔盖盆地

Key words:high-resolution sequence stratigraphy; stratal slicing; frequency decomposing technology; South Turgay Basin

摘    要:在高精度层序地层格架内,应用地震沉积学方法,通过90°相位转换、地层切片和分频处理,进行地震属性趋势和钻井综合分析,研究哈萨克斯坦南图尔盖盆地A区沉积岩岩性、沉积体系及其响应特征,确定沉积微相的边界与分布范围以及单砂体的体积、厚度与规模。研究结果表明:该区河流相发育,以河床滞留沉积、边滩、河漫滩、河漫湖泊等微相为主;不同频率对地震数据的相位等特性有不同响应,刻画地质体的横向不连续性能力也有所不同,频率为20~25 Hz时对河道砂体最敏感,在地层切片上完整清晰地刻画出河道边界、宽度、延伸长度及其平面几何形态。

Abstract: Using seismic sedimentology technologies, such as 90° phasing convertion, stratal slicing and frequency decomposition, lithology and facies of sedimentary rocks in block A of South Turgay Basin in Kazakstan were studied in the high-resolution sequence stratigraphic frameworks. And the boundary and distribution range of microfacies, even to the size, thickness and scale of single sand body were confirmed. The results show that the block A develops meandering river deposit, including four microfacies, i.e., lag deposit, point bar deposit, flood-plain deposit and flood-lake deposit. And meanwhile, different frequency bands have different response features and different capabilities to characterize the horizontal discontinuity of geologic bodies in seimic data. The frequency decomposing stratal slicing (20-25 Hz) displays channel sand bodies clearly and characterizes channel boundary, width, extended length and plane geometric shape accurately.

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