基准面旋回与储层宏观非均质性的关系——以鄂尔多斯盆地东部山2段为例  

Control of base level cycles on reservoir macroscopic heterogeneity: A case study from the second member of Shanxi Formation in eastern Ordos Basin

作　　者：李君文[1] 

机构地区：[1]中国石油大庆油田有限责任公司勘探开发研究院

出　　处：《岩性油气藏》2011年第3期29-34,39,共7页Lithologic Reservoirs

摘　　要：鄂尔多斯盆地东部山西组山2段为一套砂岩、泥岩及薄煤层互层组合,储层非均质性强,明显受地层基准面旋回升降过程中可容纳空间与沉积物供给量比值的影响。通过对山2段不同级次基准面旋回的划分与对比,建立了研究区高分辨率层序地层格架;根据短期基准面升、降旋回过程与储集物性关系的分析,分别建立了物性向上变差、物性向上变差复变好、物性变化不大等3种储层非均质模式;利用砂岩密度、砂体钻遇率和渗透率变异系数等参数描述了各中期基准面旋回层序的储层宏观非均质性变化。结果表明,长期基准面旋回上升的早期、中期形成的中期旋回层序储层非均质性弱,长期基准面旋回上升晚期到下降期储层非均质性强。The second member of Shanxi Formation consists of a suite of thin interbedded sandstone,mudstone and coal bed in eastern Ordos Basin.It has strong reservoir heterogeneity and is obviously influenced by the acceptable space-sedimentary supply ratio in base level cycle process.Based on the division and contrast of the different base level cycles of the second member of Shanxi Formation,the high resolution sequence stratigraphic framework is set up.Through analyzing the relationship between the cycle process of short-term base level and physical properties of the reservoir,three reservoir heterogeneity models of reservoir physical properties are established.The macroscopic heterogeneities of the middle-term base level cycles are described by means of the parameters such as sand density,drilling ratio and permeability variation coefficient.The result shows that the reservoir heterogeneity of the middle-term cycles formed in the early and middle period of the rising of the long-term base level cycle is weak,and it is strong from the late period to declining period.

关 键 词：高分辨率 短期基准面旋回 储层非均质性 山西组 鄂尔多斯盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]