济阳坳陷东营凹陷北带砂砾岩扇体沉积相井震联合地震精细描述

doi:10.3969/j.issn.1006-6535.2021.01.003

摘要/Abstract

摘要： 砂砾岩扇体油藏是胜利油田增储上产的重要油藏类型之一,针对该类油藏储层非均质性强,储层描述精度低等难题,以岩心观察、测井响应分析和地震正演为基础,采用精细期次划分、合成记录标定及数值模拟等方法,对东营凹陷北部陡坡带Y22井区砂砾岩扇体进行了亚相、微相的井震联合精细划分。研究表明:砂砾岩扇体各沉积亚相不同的沉积结构使其具有不同的反射特征,波形聚类属性能够较好地区分沉积亚相;盐家地区砂砾岩扇体扇中亚相主要发育辫状水道、水道间2种沉积微相,辫状水道岩性主要以厚层含砾砂岩沉积为主,水道边部为泥岩与含砾砂岩交互沉积;AC、R_LLD与CNL测井曲线能够较好地区分岩性,在沉积相与构造期次模型的约束下,以测井曲线为基础,利用变差函数模拟能够实现砂砾岩扇体沉积亚相、微相的井震联合地震精细描述。该技术能够精细刻画砂砾岩扇体沉积相带,为砂砾岩扇体的勘探部署及后期产能建设提供技术支撑。

关键词: 砂砾岩扇体, 沉积亚相、微相, 井震联合, 地震精细描述, 济阳坳陷

Abstract: Glutenite fan reservoir is one of the important reservoir types for enhancing reserve and productivity in Shengli Oilfield. In view of the problems of strong heterogeneity and low accuracy of reservoir description, on the basis of core observation, logging response analysis and seismic forward modeling, the glutenite fan in Well Y22 in the northern slope of the Dongying Sag was finely divided with well-to-seismic integration into subfacies and microfacies by such methods as fine stage division, synthetic record calibration, and numerical simulation. It is found in the study that the different sedimentary structure of sedimentary subfacies of glutenite fan brought about different reflection characteristics, and the sedimentary subfacies could be easily distinguished by waveform clustering attribute; the middle-fan subfacies of the glutenite fan in the Yanjia Area was mainly developed with two sedimentary microfacies, namely braided channel and water channel, the lithology of the braided channel was mainly composed of thick pebbled sandstone deposit, and the edge of the water channel was composed of interactive deposit of mudstone and pebbled sandstone; the regional lithology could be easily distinguished with AC, R_LLD and CNL logging curves, and accurate description by well-to-seismic integration of sedimentary subfacies and microfacies of the glutenite fan based on logging curves and variogram simulation, under the constraints of sedimentary facies and tectonic stage models. This technology can accurately describe the sedimentary facies zone of the glutenite fan, and provide technical support for the deployment of glutenite fan exploration and later productivity construction.

Key words: glutenite fan, sedimentary subfacies and microfacies, well-to-seismic integration, accurate seismic description, Jiyang Sub-basin

中图分类号:

TE122.2

刘建伟. 济阳坳陷东营凹陷北带砂砾岩扇体沉积相井震联合地震精细描述[J]. 特种油气藏, 2021, 28(1): 18-25.

Liu Jianwei. Accurate Description by Well-To-Seismic Integration of Glutenite Fan Sedimentation in the Northern Dongying Sag, Jiyang Sub-basin[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 18-25.

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