陡坡带厚砂岩油藏地层划分与对比——以JX油田5、6井区为例

Stratigraphic Division and Correlation of Thick Sandstone Reservoir in Steep Slope Region

金宝强 杨庆红 孙红杰 童凯军 黄保纲 李久

JIN Baoqiang YANG Qinghong SUN Hongjie TONG Kaijun HUANG Baogang LI Jiu

中海石油(中国)有限公司天津分公司勘探开发研究院, 天津塘沽 300452; 中海油田服务股份有限公司油田生产事业部, 天津 300450

Bohai Oilfield Exploration and Development Institute, Tianjin Branch, CNOOC Limited, Tianjin 300452, China; Tianjin Branch, China Oilfield Services Limited, Tianjin 300450, China

针对JX油田5、6井区东营组构造陡、含油范围窄、砂地比高的特点,为典型的构造坡折带厚砂岩油藏。通过恢复古地貌及选取稳定标志层,建立地层对比约束框架。利用测井及岩心资料,划分地层的沉积旋回,开展多井间沉积旋回对比,建立JX油田5、6井区精细地层对比格架。通过断点识别、井震标定及油水系统分析对地层对比结果进行检验,最终将JX油田5、6井区划分为9个油层组。根据地层对比结果,结合油藏数值模拟研究,将5、6井区东营组划分为7套开发层系,采取高部位采油、低部位注水的方式进行开发。生产实践证实,油田开发取得了较好效果。

Dongying Formation is characterized by steep-dip structure, narrow oil-bearing area and high net-to-gross in 5&6 well blocks, JX oilfield, being typical thick sandstone reservoir in slope break belt. Through palaeo-geomorphology restoration and stable horizon marker selection, the constrained framework for stratigraphic correlation has been established. Using well log and drilling core data, sedimentary cycle division and multi-well stratigraphic correlation have been finished, and the fine stratigraphic correlation framework has been constructed for 5&6 well block in JX oilfield. The result of stratigraphic correlation has been examined through fault point identification, well-seism calibration and oil/water interface analysis. Nine oil layers have been divided finally. Based on the result of stratigraphic correlation, combined with reservoir simulation results, Dongying Formation is divided into seven development layer serieses. The development method of production oil on high position and injecting water on low position has been used, and good oilfield development effect has been obtained.

https://doi.org/10.3969/j.issn.1008-2336.2012.03.039