大庆长垣外围葡萄花油层层序地层划分及地层模式

Sequence Stratigraphic Division and Stratigraphic Model of Putaohua Oil Reservoir Around Daqing Placanticline

葡萄花油层是松辽盆地长垣外围的主力油层,随着主体区块已陆续投入开发,新的区块优选难度越来越大,其中一个原因是对该套地层的层序地层格架和样式认识不够深入。本文应用高分辨率层序地层学理论方法,结合岩心、测井、地震资料,在高精度层序划分的基础上,建立葡萄花油层层序地层格架。结果表明:葡萄花油层对应长期基准面上升半旋回,可以进一步划分为2个中期半旋回和11个短期旋回;葡萄花油层不同沉积体系控制下的地层结构模式,尝试解决油藏描述中遇到的单元划分对比、沉积环境确定等一系列问题,并为葡萄花油层整体的的开发规划以及落实滚动外扩潜力奠定地质基础。

Putaohua reservoir is the main reservoir in the periphery of Songliao basin. With the development of the main block, the new block optimization is becoming more and more difficult. One of the reasons is that the sequence stratigraphic framework and style of the formation are not well understood. In this paper, a sequence stratigraphic framework of Putaohua oil reservoir was established on the basis of high-resolution sequence stratigraphy theory, core, logging and seismic data. The results show that Putaohua reservoir can be further divided into two medium-term half cycles and 11 short-term cycles corresponding to the long-term baseline rising half cycles. The sequence stratigraphic model controlled by different sedimentary systems of Putaohua reservoir was used to solve a series of problems encountered in reservoir description, such as unit division and correlation, determination of sedimentary environment, which could lay a geological foundation to plan the overall development of Putaohua reservoir, and tap the potential of rolling expansion.