摘要
对坪北油田延长组长4+5—长6油层组进行高分辨率层序地层对比研究,识别出2个长期旋回、4个中期旋回及若干个短期旋回,并建立等时地层对比格架。在基准面旋回格架内,通过分析物性非均质性参数、层内夹层、分层系数、砂岩密度、砂岩钻遇率、分布系数、连通系数和厚度变异系数等参数,定量研究储层宏观非均质性。研究表明,储层层内非均质性强,层内物性非均质性可分为3类,层内夹层分布多且分布不稳定;层间非均质性不明显,MSC2、MSC3旋回主要发育局部连通性好的砂体,MSC4旋回主要发育孤立型砂体;平面非均质性中—强,平面上砂岩厚度分布变化较大。此外基准面变化与储层非均质性关系分析表明,基准面变化对储层宏观非均质性有明显控制作用。
Chang4 ＋ 5 - Chang6 of Yangchang Formation in Pingbei oilfield was correlated using high resolution sequence stratigraphic approach. 2 long term cycles, 4 middle term cycles and many short term cycles were recognized, and high resolution isochronous stratigraphic frameworks were established. Reservoir macroscopic heterogeneity is studied within framework of base-level cycles. Through analyzing of internal physical property heterogeneity, interbed barrier, stratification coefficient, distributional density of sandbodies, physical property heterogeneity, encountering percentage of sandbody, distribution coefficient, connectivity and variation coefficient of thick, reservoir macroscopic heterogeneity was quantitiatively discussed. The study shows that, internal heterogeneity is strong, internal physical property can be divided into 3 types, and interbed barriers are plenty and unstable distributing. Interlayer heterogeneity is not so strong, MSC2, MSC3 mainly are composite of sandbody which has good local connectivity, but MSC4 mainly is consisted of insular sandbody, plane heterogeneity is medium-strong, and distribution of sandstone thickness has large variation in plane, Finally, analysis of influence of base-level changes to reservoir heterogeneity shows that base level change has apparent controls on reservoir macroscopic heterogeneity.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2008年第1期30-33,38,共5页
Petroleum Geology & Oilfield Development in Daqing
关键词
基准面旋回
非均质性
延长组
坪北油田
base-level cycle
heterogeneity
Yanchang Formation
Pingbei oilfield
作者简介
淡卫东（1977-），男，陕西户县人，博士，从事层序地层学及储层沉积学研究。
