摘要
基于地层因素影响地层发育的观点,分析了可容纳空间与物源供给的比值(A/S)对砂体叠置样式的控制作用。在低A/S值条件下,砂体空间叠置样式为“拼合型”,剖面上多期砂体呈“线一线”接触方式复合,连通性好;在中A/S值条件下,砂体空间叠置样式为“迷宫型”,剖面上多期砂体呈“线一点”或“点一点”接触方式复合,连通性变差;在高A/S值条件下,砂体空间叠置样式为“孤立型”,剖面上多期砂体孤立分布,互不连通。根据这一控制原理,对鄂尔多斯盆地西峰地区延长组长8段层序地层及砂体叠置样式进行了研究。结果表明,地层因素对砂体叠置样式具有明显的控制作用,用A/S值变化的控制原理能有效判定储层特征。
On the basis on the viewpoint of strata development influenced by stratigraphic factors, the control of accommodation and sediment supply ratio (A/S) on sandbody superimposition pattern is analyzed. Under low A/S ratio, the pattern of sandbody superimposition is jigsaw-puzzle type", and multiple-period sandbodies on the cross section superimpose in "line-line" contact form with good connectivity; Under moderate A/S ratio, sandbody suYanchang Formation ( Chang No. 8 Member) of Xifeng area in the Ordos Basin is conducted. The study indicates that sandbody superimposition patterns are obviously controlled by formation factor; the reservoir characteristics can be effectively determined by the controlling principle of the changed A/S ratios.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2011年第2期25-30,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重点基础研究发展规划项目(2003CB214602-02)资助.
关键词
基准面
可容纳空间
物源供给
砂体叠置样式
西峰地区
延长组
base level
accommodation space
sediment supply
sandbody superimposition pattern
Xifeng area
Yanchang Formation