湖相沉积旋回识别方法在银川盆地中的应用  

Method for Identifying Lacustrine Sedimentary Cycles and Application in Yinchuan Basin

作　　者：武向峰[1] 崔红庄[1] 郇玉龙[1] 

机构地区：[1]中国石化胜利油田分公司西部新区研究院,山东东营257000

出　　处：《新疆石油地质》2014年第5期587-592,共6页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(41102060)

摘　　要：传统费希尔图解方法主要用于识别海相碳酸盐岩露头剖面沉积层序和反演长周期海平面变化,并需要人工识别沉积旋回,识别困难且存在多解性。以银川盆地深层钻井自然伽马曲线为研究对象,提出通过最小二乘法、一阶差分等数据处理,并将此图解技术引入陆相湖泊碎屑岩沉积中,定量分析旋回特征。在银川盆地渐新统清水营组湖相沉积中识别出426个高频沉积旋回,平均厚度为4.5 m,图解显示银川盆地渐新世主要经历2次较大的三级湖平面升降变化。通过岩屑录井剖面旋回对比分析,证实了该方法在划分湖相碎屑岩沉积旋回的可行性。Traditional Fischer graphical method is mainly used for diagnosing the exposed marine carbonate sedimentary sequence and inverting the long-period sea level changes,while for sedimentary cycle identification,some artificial methods should be used with ambiguity.This paper takes the Yinchuan basin deep drilling gamma ray curves as an example,proposes the graphical method for identifying lacustrine clastic deposit by means of least square method and first order difference processing technique.The cycles characteristics can be quantitatively analyzed.By this method,426 high-frequency cycles with average thickness of 4.5 m in the Oligocene Qingshuiying lacustrine deposits in Yinchuan basin are identified,which indicate that the Oligocene period in Yinchuan basin mainly underwent 2 major three-order lake level changes.Compared with the cutting logging cycle analysis results,this method is confirmed to be feasible and generalized.

关 键 词：沉积旋回 费希尔图解 银川盆地 湖平面变化 

分 类 号：TE111.3[石油与天然气工程—油气勘探]