海洋地质前沿2025，Vol.41Issue(10)：12-27,16.DOI:10.16028/j.1009-2722.2024.218
基于地震地貌学精细分析西湖凹陷西次凹Y构造花港组3段沉积微相
Application of seismic geomorphology for the fine characterization of sedimentary microfacies of Member 3 of Huagang Formation in Y Structure,western subsag,the Xihu Sag
摘要
Abstract
To address the problems of difficulty in identifying the depositional period from seismic data and spa-tial morphology of riverine sand body in the giant thick sand geological body in Member 3 of Huagang Formation(H3 in short)in Y Structure,western subsag,the Xihu Sag,was selected as the research object.Based on the sedi-mentary characteristics revealed in boreholes,the main frequency for implementing harmonic frequency enhance-ment technology was determined via sand body combination forward simulation,and isotime stratigraphic frame-work were established to identify sedimentary cycles by combining the generalized S-transform and wavelet trans-form.the H3 of the study area could be subdivided into three short-term cycles,namely,H34,H33,and H32-H31.The root-mean-square amplitude(RMSA),coherent energy(CEA),and instantaneous phase(IP)attributes were selected via correlation analysis between the attributes and sand thickness.The internal structure and planar distri-bution characteristics of branching channels were depicted by using multi-attribute fusion,in which the geological information and capability of the sensitive attributes were combined.Constrained by the interpretation of seismic facies within a typical section sequence framework,the internal structure and planar distribution characteristics of branch channels were characterized.Results show that the H3 section of the Y Structure is characteristic of a typ-ical shallow-water braided river deltaic plain,with a large thickness of sand body,and obvious multi-phase super-position of normal grading sequences in vertical direction,which reflects the characteristics of sand-wrapped mud.The development of three branch river channels in NE-SW orientation,and the distribution of sedimentary micro-phase was controlled by the relative height of the lake level.During the period of H34-H31,the lake level kept rising,river channels were intertwined in large area,and the largest lake flood surface was formed during H31,dur-ing which river channel diverted and the size of river channel continued to shrink.Seismic geomorphological map-ping method that integrates frequency enhancement,seismic phase,and multi-attribute fusion provided a new ap-proach for effective deciphering of thick sand bodies in shallow water braided river delta plains.关键词
地震地貌学/分支河道/属性融合/花港组/西湖凹陷Key words
seismic geomorphology/branching channels/attribute fusion/Huagang Formation/Xihu Sag分类
海洋科学引用本文复制引用
符传骥,李斌,张百涛,魏鹏,李昆..基于地震地貌学精细分析西湖凹陷西次凹Y构造花港组3段沉积微相[J].海洋地质前沿,2025,41(10):12-27,16.基金项目
四川省区域创新合作项目"复杂油藏高效开发相关技术研究及推广应用"(2021YFQ0048) （2021YFQ0048）
