塔里木盆地东河砂岩体储层构型成因模式研究

发布时间：2018-03-22 00:11

本文选题：浪控滨岸　切入点：成因模式　出处：《中国石油大学(北京)》2016年博士论文　论文类型：学位论文

【摘要】：塔里木盆地东河砂岩是典型的海相碎屑岩沉积,也是重要的勘探和开发目标之一,砂体的空间叠置关系造成了油水关系复杂的现状,深化储层内部结构的认识,是该类地下储层所面临的关键问题。但是目前对海相浪控滨岸沉积储层的认识主要集中在复合砂体的层次,其内部构型模式是尚未解决的科学问题,这也极大地制约了此类储层的进一步开发和剩余油挖潜。本文在东河砂岩层序地层对比与划分的基础上,综合利用露头、岩心、地震、测井等资料,揭示了不同沉积背景下的浪控滨岸砂体的沉积成因机理,并结合野外露头及地下储层分析,对浪控滨岸岩性体进行了进一步的分级解剖,建立了东河砂岩浪控滨岸砂体的内部构型模式。通过分析东河砂岩浪控滨岸沉积的物源供给与相对海平面变化、水动力条件以及古地貌特征等控制影响因素,结合不同目标区的砂体区域展布及沉积岩石学特征,提出了东河砂岩浪控滨岸沉积成因模式:东河1井区发育三角洲改造背景的浪控滨岸沉积;哈得逊井区发育浅滩背景的水进-水退型浪控滨岸沉积;塔中4井区发育缓坡背景的海侵型浪控滨岸沉积。在成因模式的指导下,结合丰富的静态地质、动态资料以及小海子露头资料分析,分复合砂体、单一砂体和内部组成单元三个级次进行了东河砂岩浪控滨岸沉积构型表征。不同级次构型界面处常对应发育渗流屏障,包括原生沉积型、次生成岩型以及混合成因型三类,基于动、静模式约束,提出了其空间分布预测方法。复合砂体包括坝砂、滩砂以及凹槽沉积等要素类型,呈连片叠置、侧向迁移的特征,根据物源供给和相对海平面变化之间的关系将其叠置样式分为退积型、进积型和加积型三类。依据沉积成因模式,划分了单一砂体及内部组成单元成因类型;在复合砂体内部,总结了模式拟合控制、基于井资料界面识别以及生产资料分析等单一坝砂及内部组成单元的识别标志。退积型复合砂体中单一坝砂的空间分布主要有连续上超型、阶步迁移型、补齐厚层型3种样式;进积型复合砂体中单一坝砂的空间分布包括厚层堆积型、阶步迁移型、连续叠加型3类。内部组成单元主要存在向海迁移型和向陆迁移型两类堆积样式。在此基础上,结合渗流屏障的成因及分布特征,建立了东河砂岩浪控滨岸储层构型要素的空间关系及内部构型模式。体现在水平产状型渗流屏障、平面相变(渗流差异)、以及垂向相变(层间干扰)控制;单一坝级次的控制影响主要体现在砂体韵律性、倾斜产状渗流屏障以及单砂体叠置样式控制;内部组成单元级次的控制影响主要体现在渗流屏障发育程度和韵律性控制。
[Abstract]:Donghe sandstone in Tarim Basin is a typical marine clastic rock deposit and one of the important exploration and development targets. The spatial superposition of sand bodies results in the complex oil / water relationship and deepens the understanding of the internal structure of the reservoir. It is a key problem for this kind of underground reservoir, but the understanding of marine wave-controlled shoreline sedimentary reservoir is mainly focused on the level of composite sand body, and its internal configuration model is an unsolved scientific problem. This also greatly restricts the further development of this kind of reservoir and the exploitation of remaining oil potential. Based on the correlation and division of the sequence stratigraphy of Donghe sandstone, this paper makes comprehensive use of outcrop, core, seismic, logging and other data. The sedimentary genesis mechanism of wave-controlled shoreline sand body under different sedimentary background is revealed. Combined with field outcrop and underground reservoir analysis, further classification anatomy of wave-controlled shoreline lithologic body is carried out. In this paper, the internal configuration model of Donghe sandstone wave-controlled shoreline sand body is established. By analyzing the controlling factors such as source supply, relative sea level change, hydrodynamic condition and paleogeomorphology characteristics of the wave-controlled shoreline sediment of Donghe sandstone, Based on the distribution of sand bodies in different target areas and the characteristics of sedimentary petrology, this paper puts forward the formation pattern of wave-controlled shoreline deposits in Donghe sandstone: the wave-controlled shoreline deposits of delta reformation background in Donghe 1 well area; In the Hudson well area, the shoal background is developed by water-shot-water regressive wave-controlled shoreline deposition, and the Tazhong 4 well area develops transgressive wave-controlled shoreline sediment in the mild-slope background. Under the guidance of the genetic model, combined with abundant static geology, Dynamic data and outcrop data of small Haizi are analyzed. Three stages of composite sand body, single sand body and internal composition unit are used to characterize the wave-controlled coastal sedimentary configuration of Donghe sandstone. The interface of different order configuration often corresponds to the development of seepage barrier. Based on the constraints of dynamic and static modes, the spatial distribution prediction method is proposed. The composite sand body consists of dam sand, beach sand and trough sedimentation, which are superimposed on each other, and are composed of three types: primary sedimentary type, secondary sedimentary type and mixed genetic type. According to the relationship between the source supply and the relative sea level change, the lateral migration can be divided into three types: retrogradation type, precession type and accretion type. According to the sedimentary genetic model, the genetic types of single sand body and internal composition unit are divided. In the body of composite sand, the model fitting control is summarized. Based on the identification of single dam sand and its internal components such as well data interface identification and production data analysis, the spatial distribution of single dam sand in regressive composite sand body mainly includes three types: continuous supertype, step migration type and filling thick layer type. The spatial distribution of single dam sand in the precession type composite sand body includes three types: thick layer accumulation type, step migration type and continuous superposition type. Combined with the origin and distribution of seepage barrier, the spatial relationship and internal configuration model of reservoir configuration elements of Donghe sandstone wave-controlled seashore reservoir are established, which are reflected in horizontal occurrence seepage barrier. The control of single dam level is mainly reflected in the rhythm of sand body, the inclined percolation barrier, and the control of single sand body superposition style, while the control of plane phase transition (seepage difference) and vertical phase transition (interlayer interference) are mainly reflected in the rhythm of sand body, the inclined percolation barrier and the control of single sand body superposition style. The order control of internal components is mainly reflected in the development of seepage barrier and rhythm control.
【学位授予单位】：中国石油大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13

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