陇东地区长9沉积特征及湖岸线确定依据

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

 余威¹ 罗安湘² 王峰¹ 邓秀芹² 刘哲³ 刘鑫²

成都理工大学沉积地质研究院，四川 成都 610059 中国石油长庆油田分公司勘探开发研究院，陕西 西安 710021 中国石油长庆油田分公司勘探部，陕西 西安 710021）

Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi′an 710021, China Exploration Department, Changqing Oilfield Company, PetroChina, Xi′an 710021, China)

 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。

 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.

10.6056/dkyqt201706007