摘要
利用电测井曲线解释沉积环境必须掌握具标志性特征的三个结构要素:幅度、形态及组合特征。以自然电位曲线为主,视电阻率曲线为辅。本文以苏北高邮凹陷主要含油岩系为例,研究了大量岩心实物,然后与电测井资料进行系统分析、对比,找出岩-电对应关系,总结出各类沉积环境特有的曲线形态和层序组合,以此来指导区域上的沉积环境判别及相带划分。
Abstract
To interprete sedimentary environment, it is necessary to master the three foundamental elements with marking features: amplitude, shape and assemnlage. Accondng to the analysis and comparison on the petroliferous series in the Gaoyou Depression, North Jiangsu, the curves' shape and sequence assem-blages of subaqueous alluvial fan, delta, fluvial and deep-water turbidite fan aresummarized as below: 1.Subaqueous alluvial fan: From bottom to top, SP appears to be a sequence assemblage changed from low-amplitude, serrated tank shape or positive serrated shape to middle-high amplitude serrated box shape or bell (funnel)shape to low-amplitude reverse serrated shape; changes from dense serrated high resistance to serrated high-middle resistance and then disperse serrated middle-low resistance. 2.Delta: The logs of regressive constructive deltas show that the appears to be a sequence assemblage changing from smooth line associated with low-middle amplitude funnel shape to funnel, finger or box shapes of middle-high amplitude to box or bell shape of middle-high amplitude,and R is relatively low. 3.Fluvial: Land-based rivers are developed gradually from braid channels to meandering channels; SP shows shapes from box with fine sawtooth to bellor separated box to bell assemblage maintained by middle amplitude. changes from serrated middle-high value to middle-lower value. 4.Deep-water turbidite fan: These curves are difficult to be distinguished from that of subaqueous alluvial fan, it is therefore necessary to see about its occurrence location.
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