滦平上侏罗统—下白垩统扇三角洲露头层序地层学研究

Sequence stratigraphy of Upper Jurassic-Lower Cretaceous fan-delta outcrops in Luanping

在油田开发中,地层划分与对比是十分重要的研究内容,从油田开发到调整等各个阶段,对地层划分与对比的要求越来越高。但油田地下资料是有限的,第一,当井网密度达到一定程度时,不是可以无限制加密的;第二,油田所能获取的占绝对优势的地下信息是通过测井,而测井分辨率又是有限的。所以,高分辨率层序地层学被广泛应用和发展的过程中,野外露头研究是必不可少的。笔者以露头资料为研究对象,对露头区扇三角洲高频层序、准层序、准层序组的剖面识别标志进行了总结,定量研究了不同成因类型砂体的分布规律、几何形态、内部结构和非均质性。把高分辨率层序界面的露头标志向井下岩心和测井信息进行转化,并在露头研究的基础上总结层序地层对比的一般原则。

Stratigraphic division and correlation are the basic and very important content of study during oilfield development. In various stages from oilfield development to adjustment, higher and higher requirements are set for the stratigraphic division and correlation. However, the underground information is limited in a real oil field. Firstly, when the well pattern density reaches a certain level, infill wells are not unrestricted. Secondly, the overwhelming majority of underground information is obtained by well logging, but the resolution of log data is limited. Therefore, during the wide application of high-resolution sequence stratigraphy, outcrop research is essential Based on actual fan-delta outcrops, the authors have summarized the indicators of recognizing the high-frequency sequences, parasequences and parasequence sets in the fan delta of the outcrop area, quantitatively studied the distribution characteristics, geometry, internal structure and heterogeneity of sandbodies of different genetic types, transformed the outcrop indicators of the high-resolution sequence boundaries into underground core and log information and finally summed up general principles of sequence stratigraphic correlation on the basis of the outcrop research.