基于辫状河储层特征控制的地震反演砂体刻画——以苏里格气田盒8下段为例  

Sand Body Description from Seismic Inversion Based on the Control of Braided River Reservoir Characteristics:Taking the lower of H 8 formation in Sulige gas field as an example

作　　者：翟羽佳 马君霞 马旭 杨洋 张润 ZHAI YuJia;MA JunXia;MA Xu;YANG Yang;ZHANG Run(Changqing Oilfield Company Gas Producyion Plant No.5,Xi’an 710018,China;Beijing 3G Land Petroleum Technology Co.,Beijing 100107,China;Changqing Oilfield Company Oil Producyion Plant No.3,Yinchuan 750005,China)

机构地区：[1]长庆油田分公司第五采气厂,西安710018 [2]北京三纪兰德石油科技有限公司,北京100107 [3]长庆油田分公司第三采油厂,银川750005

出　　处：《沉积学报》2024年第5期1711-1722,共12页Acta Sedimentologica Sinica

摘　　要：【目的】干扰试井显示苏里格气田主力产气层盒8下段砂体连通性差,SD27-36区块密井网(500 m×600 m)条件下砂体展布特征仍不明确。亟需探索砂体规模及叠置方式的刻画方法,以明确井间砂体的连通性。【方法】将现代河流和野外露头观测结果与地质统计学反演结合,以观测结果优化反演参数并建立刻画模型,精细识别砂体边界及其叠置关系,实现砂体三维空间定量刻画。【结果与结论】观测显示盒8下段辫状河单心滩砂体纵横向剖面上呈孤立、对接、切叠等多种接触关系,单砂体平面规模小(长200~600 m,宽50~250 m),以叠置、复合方式形成特定形态的复合心滩砂体。地质统计学反演获得的砂体三维刻画结果边界清晰,井间砂体与井点岩性过渡自然,砂体规模与沉积观测结果相似,砂体连通性认识与干扰试井试验结果符合率达87%。本次砂体刻画结果及方法不仅能指导苏里格气田的勘探和开发部署,也可以为其他辫状河砂体认识提供借鉴。[Objective]The interference testing indicates that the sand body connectivity in the lower of He 8 formation,the main gas-producing layer of the Sulige gas field,is poor.Under the condition of the dense well pattern(500 m×600 m)in the SD27-36 block,the distribution characteristics of sand bodies remain unclear.The purpose of this paper is to explore the characterization of sand bodies scale and stacking patterns,so as to clarify the connectivity of sand bodies between wells.[Methods]Modern river and field outcrop observations were combined with geostatistical inversion to optimize the inversion parameters and establish a characterization model based on the observation results,so as to accurately identify sand body boundaries and their overlapping relationships,and realize three-dimensional quantitative characterization of sand bodies.[Results and Conclusions]The observation shows that the sand body of the braided river single core beach in the lower of He 8 formation has various contact relationships such as isolation,butt and cut stack.,and the single sand body has a small plane size(200-600 m long,50-250 m wide),and the composite core beach sand body of a specific shape is formed by superposition and composite.The boundary of threedimensional sand body characterization obtained by geostatistics inversion is clear,the lithology transition between the sand body and the well point is natural,the sand body size is similar to the sediment observation results,and the understanding of sand body connectivity aligns with the results of interference well testing at a rate of 87%.The results and methods of sand body characterization can not only guide the exploration and development planning of the Sulige gas field,but also provide reference for other braided river sand bodies.

关 键 词：苏里格气田 盒8下段 辫状河沉积 地质统计学反演 砂体刻画 

分 类 号：P618.13[天文地球—矿床学]