川西北天井山泥盆系平驿铺组油砂储层沉积学研究

通过岩石学、沉积学和储层地质学分析认为天井山平驿铺组主要发育灰白色中-厚层石英砂岩、石英砂岩夹粉砂岩、粉砂质泥岩和泥岩。从平驿铺组油砂储层中识别出临滨亚相,并进一步划分为上临滨、中临滨和下临滨3个微相;得出了平驿铺期龙门山地区持续沉降并接受自西向东方向的古特提斯洋的海侵的初步认识。海侵带来的大量陆源碎屑物质堆积在沉降区,形成了北东向展布、北西—南东分带、北西厚而南东薄的平驿铺组的陆缘碎屑滨岸沉积。储层的物性受沉积相的控制,上临滨微相的储层物性最好,中临滨微相次之,下临滨微相较差。

Sedimentological study of oil sand reservoir in Lower Devonian Pingyipu Formation of Tianjing Mountain,northwestern Sichuan

On the basis of petrological，sedimentological and reservoir geological analyses，the authors con- sider the Pingyipu Formation of Tianjing mountain is mainly composed of gray middle- thick layer of quartz sand- stone，quartz sandstone intercalated silty mudstone and mudstone． The shore facies are identified from the oil sands reservoir of Pingyipu Formation，and are further divided into the upper，middle and lower shore micro- facies． The established sedimentary model showed sustainable settlement of Longmen Mountain area in Pingyipu stage and it ac- cepted the Paleo- - Tethys Ocean transgressive from west to east． A lot of terrigenous detrital material deposited on the settlement area，forming the Pingyipu Formation continental margin detrital shoreland of the northwest- southeast zo- nation，northeast trending and the thick northwest part and the thin southeast part． The physical properties of the reservoir are controlled by the sedimentary facies，in which the properties of upper shore face is the best，followed by the middle shore facies，and that of the lower shore facies is the worst．