常规砂岩储层油水倒置成因分析
|
摘要
锦州25-1油田沙二段油藏位于整体西倾的半背斜构造上,开发井钻后,沙二段Ⅳ油组气水界面较油顶高20 m。以地震资料、测井资料和动态资料为基础,综合研究认为该油组砂体是连通的,油水关系矛盾并非是由于沉积微相差异而导致的物性遮挡所致;通过对油气成藏时的受力分析,油水倒置主要是由于背斜构造内有一小的向斜构造,向斜构造导致该区域地层水在成藏过程中无法排出。后经生产动态证实,研究区为连通砂体,油水倒置,储量增大。
The reservoir of the second member of Shahejie formation is located in the half- anticline and the formation faces westward in Jinzhou 25- 1 oilfield. The gas- water interface is 20 m higher than the top of oil layer in the fourth oil layer in the second member of Shahejie. The sand is connected in this area through the seismic,well logging and production performance data. The reason of oil/water inversion is not caused by permeability barrier through the difference of microfacies. Mechanics analysis shows that there is a synclinal structure in the anticlinal structure and it causes oil/water inversion which leads to difficulty in draining off formation water in this area. The production performance confirms that the sand is connected in this area and oil and water reverses. At last,reserve volume increases.
The reservoir of the second member of Shahejie formation is located in the half- anticline and the formation faces westward in Jinzhou 25- 1 oilfield. The gas- water interface is 20 m higher than the top of oil layer in the fourth oil layer in the second member of Shahejie. The sand is connected in this area through the seismic,well logging and production performance data. The reason of oil/water inversion is not caused by permeability barrier through the difference of microfacies. Mechanics analysis shows that there is a synclinal structure in the anticlinal structure and it causes oil/water inversion which leads to difficulty in draining off formation water in this area. The production performance confirms that the sand is connected in this area and oil and water reverses. At last,reserve volume increases.
引文
[1]张小莉,查明,王鹏.单砂体高部位油水倒置分布的成因机制[J].沉积学报,2006,24(1):148-151.
[2]严科,仁怀强.稠油油藏油水倒置现象探讨:以孤岛油田中一区馆陶组6—7砂层组为例[J].石油勘探与开发,2009,36(5):635-640.
[3]余成林,林承焰,王正允.准噶尔盆地夏9井区八道湾组油水倒置型油藏特征及成因[J].石油天然气学报,2008,30(5):32-36.
[4]尚建林,王勇,王正允.夏9井区克下组成岩相及其对油水分布的控制作用[J].石油天然气学报,2007,29(5):23-27.
[5]张洪,何顺利,庞雄奇,等.克拉2气田成藏过程的物理模拟[J].石油与天然气地质,2006,27(1):23-26.
[2]严科,仁怀强.稠油油藏油水倒置现象探讨:以孤岛油田中一区馆陶组6—7砂层组为例[J].石油勘探与开发,2009,36(5):635-640.
[3]余成林,林承焰,王正允.准噶尔盆地夏9井区八道湾组油水倒置型油藏特征及成因[J].石油天然气学报,2008,30(5):32-36.
[4]尚建林,王勇,王正允.夏9井区克下组成岩相及其对油水分布的控制作用[J].石油天然气学报,2007,29(5):23-27.
[5]张洪,何顺利,庞雄奇,等.克拉2气田成藏过程的物理模拟[J].石油与天然气地质,2006,27(1):23-26.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心