喇萨杏油田葡萄花油层层序地层格架与地层叠加模式

SEQUENCE STRATIGRAPHIC FRAMEWORK AND FORMATION- STACKED PATTERN IN PUTAOHUA RESERVOIRS OF LASAXING OILFIELD

大庆长垣葡萄花油层地层单元数目及厚度从北向南逐渐增大，层序地层划分对比难度大。为搞清大庆长垣葡萄花油层地层发育模式，综合利用地震、测井、岩心、录井及区域地质等资料，对葡一组层序地层特征进行研究，结果表明：喇萨杏地区葡萄花油层的层序地层发育模式非常复杂，往往是以下4种模式综合作用形成：前积模式，削蚀减薄地层发育模式，低可容空间下的薄层叠覆模式，河道分叉或摆道模式。喇萨杏油田目的层的层序地层发育模式对于地层等时划分对比和沉积规律研究具有重要意义。

The stratigraphic units and thickness of Putaohua oil reservoirs in Daqing Placanticline become gradually numerious and large from north to south, thus the sequence stratigraphic division and correlation turn more diffi- cult. To make clear of the developed mode of Putaohua oil reservoirs in the Placanticline, with the help of the inte- grated use of seismic, well-logs, core, mud logging and regionally geological data and so forth, the studies of the sequence stratigraphic characteristics of PI Formation are conducted. The study results show that the very complex sequence stratigraphic developed mode of Putaohua oil reservoirs in the Placanticline is generally resulted from the combined action of following four modes ： （ 1 ） the mode of foreset ; （ 2 ） the stratum developed mode of truncation ; （ 3 ） the mode of lamina overlapped in low accumulation space （AS） ; （4） the mode of river parting and swinging channel. The sequence stratigraphic developed mode of the target layers in Lasaxing Oilfields possesses important significance for the studies of the stratigraphic sequence isochronal correlation and depositional laws.