鄂尔多斯盆地姬塬地区三角洲前缘储层砂体成因分析  

Genetic analysis of reservoir sandbody of delta front in Jiyuan region of Ordos Basin

作　　者：李树同[1] 王多云[1] 秦红[1] 王志坤[1] 

机构地区：[1]中国科学院地质与地球物理研究所

出　　处：《油气地质与采收率》2005年第6期19-22,共4页Petroleum Geology and Recovery Efficiency

基　　金：中国科学院资源环境领域知识创新工程重要方向项目(KZAX3-SW-128-04)资助

摘　　要：鄂尔多斯盆地姬塬地区延长组三角洲前缘是主要的油气储集带,为了探讨该地区储层砂体成因,文章将储层砂体类型分为六种:截削式河道、完整式河道、叠加河口坝、下残坝上河、完整坝上河和上残坝上河砂体。利用短期基准面旋回原理将这六种砂体的短期基准面旋回划分三大类六亚类,并对每一亚类砂体成因进行了分析。分析表明,砂体成因明显受基准面升降、可容纳空间和沉积物补给量比值的共同控制。最后,讨论了储层砂体分布规律并建立了该地区砂体成因分布模式。对砂体成因的细致刻画不仅可以提高该地区储层预测的精度,而且对今后的勘探和开发具有一定的指导意义。Delta front is the main oil-gas storage belt of Yan-chang formation in Jiyuan region of Ordos Basin. In order to discuss genesis of the reservoir sandbody in this area, it was divided into 6 types: truncated channels, integrated channels, superposed mouth bars, downside deformity recombination bars, integral recombination bars and upside deformity recombination bars. The short-term base-level cycle of these six kinds of sandbody were compartmentalized to 3 kinds and 6 sub-kinds by using short-term base-level cycle theory. Moreover,the genesis of every sub-kind sandbody was analyzed. The analysis shows that genesis of sandbody is evidently controlled by the base-level up-down changes and the ratio of accommodation space and sedimentary supply. Finally,the distribution rule of the reservoir sandbody was discussed and the genetic distribution model of sandbody was set up in this studied region. The detailed description of genesis of sandbody can not only improve precision of reservoir prediction, but also guide the exploration and production in the future.

关 键 词：三角洲前缘 短期基准面旋回 砂体成因 鄂尔多斯盆地 

分 类 号：TE112.21[石油与天然气工程—油气勘探]