大庆石油地质与开发2025，Vol.44Issue(3)：41-49,9.DOI:10.19597/J.ISSN.1000-3754.202309051
四川盆地合川-潼南地区基于小波变换的层序地层划分及其对有利储层的控制作用
Sequence stratigraphic division and its control on favorable reserviors of Hechuan-Tongnan area in Sichuan Basin based on wavelet transform analysis:Taking Member 4 of Upper Sinian Dengying Formation as an example
摘要
Abstract
High-frequency sequences widely develop in carbonate strata of Hechuan-Tongnan area in Sichuan Ba-sin.However,accurately dividing high-frequency sequences with only drilling and logging data available is always an academic challenge.Well GS16 in Hechuan-Tongnan area is selected for wavelet transform and cycle analysis of GR curve with Matlab wavelet analysis tool,and to analyze high-frequency sequence and sea level of Member 4 of Upper Sinian Dengying Formation.The results show that Member 4 of Dengying Formation is divided into 2 third-or-der sequences,with lower transgressive system tract and upper highstand system tract developed,respectively,and 7 fourth-order sequences and 13 fifth-order sequences are further identified.There is a good corresponding rela-tionship between different sequences and 1D curves obtained from wavelet transform.Fischer plot curve corre-sponds well with third-order sequence boundaries,and can approximately reflect fluctuation characteristics of sea level.Sea water fluctuates frequently in Member 4 of Dengying Formation,and always maintain relatively high wa-ter level.Well tie correlation in isochronous framework reveals that reservoir development of Member 4 in Dengying Formation is significantly controlled by sequences.Favorable reservoirs are more likely to develop in highstand sys-tem tract of fourth-order sequences,with characteristics of multi-stages superposition.High-frequency sequences control the foundation of high-quality reservoir development,and later epigenetic karst plays a key role in improve-ment.The research has theoretical significance for carbonate reservoir sequences division based on logging data,as well as practical significance for construction of high-accuracy sequence frameworks and prediction of favorable res-ervoirs development locations.关键词
小波变换/高频层序/灯影组四段/Fischer图解/合川-潼南地区/四川盆地Key words
wavelet transform/high-frequency sequence/Member 4 of Dengying Formation/Fischer plot/Hechuan-Tongnan area/Sichuan Basin分类
地质学引用本文复制引用
陈孝全,钱红杉,田小彬,师江波,王显东,熊昱杰,王轲,王年梅,张慧君,赵宏伟..四川盆地合川-潼南地区基于小波变换的层序地层划分及其对有利储层的控制作用[J].大庆石油地质与开发,2025,44(3):41-49,9.基金项目
中国石油天然气股份有限公司上游领域基础性前瞻项目"残留型海相盆地构造-岩相古地理重建技术研究"(2021DJ0501). （2021DJ0501）
