西北地质2024，Vol.57Issue(6)：150-160,11.DOI:10.12401/j.nwg.2024070
碳酸盐岩岩溶古河道发育特征与成因演化:以塔里木盆地塔河油田12区中—下奥陶统为例
Development Characteristics and Genetic Evolution of Carbonate Karst Ancient River:Example from the Middle-Lower Ordovician in Block-12 of Tahe Oilfield,Tarim Basin
摘要
Abstract
In order to clarify the origin of the ancient river channel on the top of the Middle and Lower Ordovi-cian in Block 12 of Tahe Oilfield,the Tarim basin,using techniques of seismic profile analysis and seismic at-tribute extraction,combined with drilling data,the development characteristics of the ancient landform and an-cient water system are depicted,the meander characteristics of the ancient river channel are quantitatively de-scribe,and the genetic evolution model of the ancient river channel is established.The results show that the an-cient channel on the top of the Middle and Lower Ordovician is entrenched meander river,and the entrenched meander is characterized by a"V"shape of the valley,symmetrical slope banks on both sides of the valley,steep valley walls,and the development of the meander core and natural bridge formed by process of natural cutoff.The ancient channel on the top of the Middle-Lower Ordovician developed a"high curvature"meander shape.Statistical meander parameters indicate that the meander ratio C values are larger than 2.20,with an average val-ue is 4.27,the C value of the whole North-South meander is 1.87,and the C value of the whole East-West mean-der is 2.38.The evolution of meandering superimposed Valley in block-12 has three stages:Silurian sedimenta-ry period,free-meander and entrenched-meander,and its genesis is closely related to the early Hercynian move-ment.关键词
塔里木盆地/塔河油田/中—下奥陶统/古河道/深切河曲/离堆山/河曲参数/弯曲率Key words
Tarim basin/Tahe Oilfield/middle-lower Ordovician/ancient river/entrenched meander/me-ander core/meander parameter/meander ratio分类
天文与地球科学引用本文复制引用
张长建,邓光校,王震,文欢,马海陇..碳酸盐岩岩溶古河道发育特征与成因演化:以塔里木盆地塔河油田12区中—下奥陶统为例[J].西北地质,2024,57(6):150-160,11.基金项目
中石化重大科技项目"基于深埋改造的塔河油藏缝洞结构研究"(P23034)资助. （P23034）
