Structural style and hydrocarbon accumulation pattern in the Paleozoic-Mesozoic buried hills in the eastern Zhanhua Sag,Jiyang Depression
The Paleozoic-Mesozoic buried hills in Jiyang Depression experienced multi-stage compression,extension,strike slip and denudation.By taking the eastern Zhanhua Sag as an example,a large amount of well drilling and seismic data is used to identify structural layers,analyze structural evolution and characteristics,summarize structural style of buried hills,and establish hydrocarbon accumulation pattern.The study results show that,controlled by multi-stage tectonic movements after the Late Paleozoic with various directions and natures,buried hills in the eastern Zhanhua Sag experienced four stages of compression,two stages of extension,two stages of strike slip and four stages of denudation,developing three types of buried hills,i.e.,high,middle and low buried hills,and forming four categories and nine types of structural styles,including extension,compression,strike slip and denudation.Based on structural styles,residual strata and the overlying strata of the buried hill,three types of hydrocarbon accumulation patterns have been established,which show diversified hydrocarbon sources,enrichment layers and enrichment characteristics.Among them,the hydrocarbon accumulation conditions are the most favorable in the Upper Paleozoic and Mesozoic on the slope of the high buried hill,the Lower Paleozoic in the middle buried hill,and all layers closely adjacent to source rock in the low buried hill,which are the key exploration targets in the near future.
万方数据
维普
