深水浊积水道沉积构型模式及沉积演化:以西非M油田为例

发布时间：2018-06-02 17:19

本文选题：储层构型 + 浊积水道　；参考：《地球科学》2017年02期

【摘要】：浊积水道是深水油田的重要储层类型,其构型模式制约油田的高效开发.依据岩心、露头、测井及地震资料,采用地震地层学、地震沉积学、沉积岩石学的方法对西非M油田中下陆坡区浊积水道进行了半定量-定量化构型模式研究,并分析了其沉积演化规律.结果表明:研究区3~5级构型单元为单一水道、复合水道、水道体系;单一水道弯曲度与坡度呈负相关,水道内部岩石相充填由底部到顶部、轴部到边缘粒度变细,厚度变薄;复合水道内部单一水道在平面上存在侧向和沿古流向两种迁移类型,剖面上存在水平式、斜列式和摆动式3种叠置样式.M油田O73油组主要发育半限制性和非限制性水道体系,平面上近物源端以发育半限制性水道体系为主,远物源端以发育非限制性水道体系为主;垂向演化规律以非限制性水道体系内部最为典型,从底部到顶部,单一水道下切能力逐渐减弱,侧向加积能力逐渐增强,弯曲度逐渐增大,水道砂体规模逐渐变小.综合分析表明,古地形坡度和物源供给是控制M油田浊积水道沉积类型及演化的主要因素.
[Abstract]:Turbidite channel is an important reservoir type in deep water field, and its configuration model restricts the high efficiency development of oil field. Based on the core, outcrop, logging and seismic data, a semi-quantitative and quantitative model of turbidite channel in the middle and lower slope of M oilfield in West Africa is studied by using the methods of seismic stratigraphy, seismic sedimentology and sedimentary petrology. The law of sedimentary evolution is also analyzed. The results show that the 3 ~ (5) grade configuration unit in the study area is a single watercourse, a composite watercourse, a watercourse system, the curvature of a single watercourse is negatively correlated with the slope, the rock facies filling in the watercourse is from the bottom to the top, the grain size from the axis to the edge becomes finer and the thickness becomes thinner. There are two types of lateral migration and along paleo-flow direction in the single waterway in the composite waterway, horizontal type in the profile, and three overlay patterns in the oblique and oscillating types. The O73 oil formation in M oilfield mainly develops semi-restrictive and unrestricted watercourse systems. In the plane, the near provenance end is dominated by the development of semi-restricted watercourse system, the distal source end by the development of the non-restrictive watercourse system, and the vertical evolution law is the most typical within the unconfined watercourse system, from the bottom to the top. The tangential capacity of a single watercourse decreases gradually, the lateral accretion capacity increases, the curvature increases, and the size of the channel sand body becomes smaller. The comprehensive analysis shows that the paleotopographic slope and the source supply are the main factors controlling the sedimentary type and evolution of turbidite channel in M oilfield.
【作者单位】：中国石化石油勘探开发研究院;中海石油(中国)有限公司天津分公司;
【基金】：国家“十三五”科技重大专项项目(No.2016ZX05033-003-002)
【分类号】：P618.13

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