陇东地区长9沉积特征及湖岸线确定依据

湖岸线位置的确定对于寻找优质储层非常重要。以鄂尔多斯盆地陇东地区延长组长9油层为例,在沉积环境标志分析的基础上,从地层厚度、砂体发育特征、砂地比、岩性及沉积构造、古生物特征、剖面结构、地球化学指标等多方面入手,明确了长9沉积时期的湖岸线位置。在此基础上,探讨了湖岸线对储集砂体发育的控制作用,以期为长9油层组进一步勘探开发提供有益的指导和理论依据。

Determination basis of lakeshore line and sedimentary characteristics of Chang 9 oil-bearing layer of Yanchang Formation in Longdong Area

It is very important to determine the position of lake shoreline to look for high quality reservoirs.Taking Chang 9 oil-bearing layer of Yanchang Formation in Longdong Area,Ordos Basin,as an example,based on signs of sediment facies analysis,the delta lake shoreline during the Chang 9 deposition period is determined through stratigraphic thickness,characteristics of sand,sand ratio,lithology and sedimentary structures,fossils,profile constitution,and geochemistry.The impact of lakeshore line on reservoir sand body is discussed,providing a useful guide and theory basis for further exploration and development of Chang 9 oil-bearing layer.