三角洲前缘储层非均质性及剩余油挖潜研究

Study on Heterogeneity of Delta Front Reservoir and Methods for Digging Residual Oil Potential

党胜国 黄保纲 王惠芝 权勃 郑浩

DANG Shengguo HUANG Baogang WANG Huizhi QUAN Bo ZHENG Hao

中海石油(中国)有限公司天津分公司, 天津 300452

Tianjin Branch of CNOOC Ltd., Tianjin 300452, China

锦州9-3油田主要含油层系为三角洲前缘相储层,多期砂体叠置,平面非均质性强,目前已进入中高含水阶段,生产矛盾突出,剩余油富集且复杂。通过研究油田小层平面分布特征、夹层分布规律、层内渗透率非均质性、层间沉积旋回的差异性和粒度韵律等参数,对油田主力油层三角洲前缘相储层非均质性进行综合表征。研究认为油田主力油层整体上属于强非均质性储层,造成储层强非均质性的主要因素为原始沉积环境下沉积旋回差异性和粒度韵律的差异性。结合各小层的水淹程度分析认为剩余油较富集的区域主要在Ⅰ2、Ⅰ4、Ⅱ11、Ⅱ12、Ⅱ2、Ⅲ1、Ⅲ2七个主力小层和油田的西侧、东部裙边带井控程度较低的区域。综合考虑造成剩余油分布差异的储层非均质性因素,制定了合理的总体调整方案和注采井网调整策略。

The main oil bearing series in JZ9-3 Field are delta front reservoirs,consisting of multiphase superimposed sand bodies,with strong heterogeneity.The oil field has been at middle-high water cut stage,with severe production problems,and remaining oil distribution is very complicated.Reservoir heterogeneity characterization on the main oil layers in delta front reservoirs has been conducted through comprehensive study on the distribution of major oil layers and intercalated layers,heterogeneity of permeability,differences in sedimentary cycle between layers,granularity rhythm.It is believed through study that the main oil layers in delta front reservoirs are very serious in heterogeneity,and the main reasons for strong heterogeneity are differences in sedimentary cycle and granularity rhythm.Combined with the analysis of water flooded degree of oil layers,it is believed that the remaining oil distributes mainly in seven main layers of Ⅰ2,Ⅰ4,Ⅱ11,Ⅱ12,Ⅱ2,Ⅲ1,Ⅲ2,western and eastern part of oil field with low well density.Considering the main factors for reservoir heterogeneity which cause the difference in distribution of remaining oil,reasonable overall adjustment plan and injection-production strategy have been made.

https://doi.org/10.3969/j.issn.1008-2336.2015.02.066