苏里格盒8下段砂质辫状河心滩构型模式及剩余气分布规律

doi:10.3969/j.issn.1006-6535.2023.05.003

摘要/Abstract

摘要： 砂质辫状河心滩是重要的油气开发储层类型,具有复杂的内部非均质性。针对苏里格气田盒8下段辫状河心滩沉积特征、构型模式及剩余气分布规律认识不清等问题,以层次分析为指导,结合构型要素分析,通过古代露头、现代沉积、取心及密井网测井等资料开展研究。结果表明:辫状河砂体具有纵向上相互叠置、平面上大面积连片分布的特征,可容纳空间的变化控制砂体的接触关系,提出了基准面升降过程中的4种砂体垂向叠置模式;砂体内部具有层次性,辫状河沉积过程中形成了不同的渗流屏障(隔夹层),分为河道底部滞留泥砾沉积、心滩落淤层、侧积细粒沉积、废弃河道充填沉积和溢岸细粒沉积5种类型,其中,落淤层是心滩内部控制油气渗流的主要因素;根据心滩不同位置水流能量特征及沉积特征差异,将心滩分为滩头、滩中、滩翼、滩尾和落淤层等构型单元,滩尾非均质性明显强于滩头,落淤层较发育的心滩上部非均质性强于心滩下部;心滩尾部和上部是剩余气富集的主要部位。研究结果对研究区及同类型辫状河沉积环境储层的勘探开发具有一定的指导作用。

关键词: 辫状河沉积, 心滩, 储层内部构型, 渗流屏障, 剩余气类型, 盒8段, 苏里格气田

Abstract: The sandy braided channel bar is an important reservoir type for oil and gas development with complex internal inhomogeneity. To address the problems of poorly understood sedimentary characteristics, architecture model and residual gas distribution rule of the braided channel bar in the Lower He8 Member of the Sulige Gasfield, a study was conducted with the analytic hierarchy process as a guide, in combination with the analysis of architectural elements and the data from ancient outcrop, modern sedimentation, coring and dense well pattern logging. The results show that the braided river sand bodies have the characteristics of mutual superposition in the longitudinal direction and large contiguous distribution in the horizontal direction, and the variation of the accommodable space controls the contact relationship of the sand bodies, and four types of sand body vertical superposition patterns are proposed during the rise and fall of the datum; as the sand body is internally hierarchical, the different seepage barriers (interbeds) are formed during the deposition of the braided river, which are divided into five types, such as river bottom stagnant mud and gravel deposits, channel bar silt layer, side-deposited fine-grained deposits, abandoned river fill deposits and overbank fine-grained deposits, and the silt layer is the main factor controlling the oil and gas seepage inside the channel bar; according to the difference of water flow energy characteristics and deposition characteristics in different locations of the channel bar, the channel bar is divided into the architectural elements such as head, center, wing, tail and silt layer, etc. The tail is obviously more inhomogeneous than the head, and the upper part of the channel bar with more developed silt layer is more inhomogeneous than the lower part; the tail and upper parts of the channel bar are the residual gas enrichment areas. The results of the study are useful for the exploration and development of reservoirs in the study area and similar braided river depositional environment.

Key words: braided river deposits, channel bar, reservoir internal architecture, seepage barrier, residual gas type, He8 member, Sulige Gasfield

中图分类号:

TE122

周恒, 马世忠, 何宇, 卢志远. 苏里格盒8下段砂质辫状河心滩构型模式及剩余气分布规律[J]. 特种油气藏, 2023, 30(5): 18-27.

Zhou Heng, Ma Shizhong, He Yu, Lu Zhiyuan. Architecture Model of Sandy Braided River Island in the Lower He8 Member of Sulige and Residual Gas Distribution Rule[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 18-27.

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