大庆石油地质与开发2025，Vol.44Issue(4)：60-70,11.DOI:10.19597/J.ISSN.1000-3754.202310020
基于粒径递减规律定量预测的冲积扇沉积体系展布
Quantitative predicted alluvial fan sedimentary system extension based on grain size downstream fining law:A case study of Kalazha Formation in southern margin of Junggar Basin
摘要
Abstract
In recent years,natural gas exploration in southern margin of Junggar Basin has made new break-throughs.However,reservoir sedimentary system extension is still less understood,restricting whole progress of ex-ploration.Based on downstream fining law of sediment grain size,variation law of conglomerate grain size in Nan'anjihaihe section and Well Tian'an 1 of Kalazha Formation is analyzed through outcrop and core comparison,so as to select quantitative relationship model that can characterize the variation of conglomerate grain size along trans-port distance in studied area and adjust it based on outcrop,core and seismic data.A quantitative relationship mod-el fitted for southern margin of Kalazha Formation is established to predict extension range of alluvial fan sedimenta-ry system.The results show that conglomerate grain size in Kalazha Formation of Well Tian'an 1 is generally small-er than that in Nan'anjihaihe section,with frequency distribution more concentrated and forward.Combined analy-sis of grain size parameters shows that conglomerates in Well Tian'an 1 are further away from provenance than that in Nan'anjihaihe section.Exponential function is more suitable for characterizing the relationship between conglom-erate grain size and transport distance in Kalazha Formation than univariate linear function and power function.Adaptability analysis shows that exponential quantitative relationship based on Shule River fan is the most similar to variation law of conglomerate grain size in Kalazha Formation.Quantitative relationship that conforms to variation law of conglomerates grain size in Kalazha Formation is established by adjusting quantitative relationship of Shule River fan.Thus,the top of alluvial fan in this area during sedimentary period of Kalazha Formation is predicted to be located 27.66 km south away from current Nan'anjihaihe section,and the end of alluvial fan is located 54.59 km north away from Well Tian'an 1.The research provides reference for quantitatively predicting the distribution of coarse clastic rock reservoirs in southern margin of Junggar Basin.关键词
冲积扇/沉积体系/展布范围/定量预测/指数函数/准噶尔盆地南缘/喀拉扎组Key words
alluvial fan/sedimentary system/extension range/quantitative prediction/exponential function/southern margin of Junggar Basin/Kalazha Formation分类
能源科技引用本文复制引用
王洋,张昌民,冀冬生,唐雪颖,袁波,付文俊,刘家乐,娄林,张祥辉..基于粒径递减规律定量预测的冲积扇沉积体系展布[J].大庆石油地质与开发,2025,44(4):60-70,11.基金项目
国家自然科学基金重点项目"分支河流体系沉积模式与储层定量预测模型"(42130813) （42130813）
中国石油天然气股份有限公司科技专项"准噶尔盆地新区新领域致密气成藏主控因素与有利目标优选"(2021DJ21). （2021DJ21）
