准噶尔盆地红车断裂带石炭系重新认识及油气成藏特征

Recognition of the Carboniferous strata in the Hongche fault zone， Junggar Basin and its hydrocarbon accumulation characteristics

潘虹 于庆森 李晓山 宋俊强 蒋志斌 王丽 罗官幸 徐文秀 尤浩宇

Hong PAN Qingsen YU Xiaoshan LI Junqiang SONG Zhibin JIANG Li WANG Guanxing LUO Wenxiu XU Haoyu YOU

准噶尔盆地红车断裂带石炭系岩性、内幕结构及接触关系复杂，为建立其地层层序，以野外露头建立的石炭系地层系统为基础，通过岩性、电性和地震属性精细地层标定，依据岩性组合特征、地震波组特征和地层接触关系进行综合分析，将西北缘后山石炭系地层系统引入盆内进行井下地层对比，建立石炭系层序剖面并开展精细地层划分与对比，在石炭系地层格架基础上开展优势岩相分析。结果表明：①准噶尔盆地盆内井下钻揭地层为上石炭统，由新到老依次为阿腊德依克赛组、哈拉阿拉特组和成吉思汗山组，整体向西超覆抬升，呈现“东西分带、南北分块”构造格局。②成吉思汗山组主要发育爆发相火山角砾岩，受推覆作用影响，阿腊德依克赛组和哈拉阿拉特组超覆尖灭，南部爆发相剥蚀减少，主体发育火山沉积相和碎屑岩沉积相。③主要含油层为成吉思汗山组和哈拉阿拉特组，南部火山角砾岩及局部安山玄武岩为油气有利指向区。

This study focuses on the Carboniferous strata in the Hongche fault zone， Junggar Basin， which are characterized by complex lithology， interior architecture， and stratigraphic contact. To establish the Carboniferous stratigraphic sequence in the fault zone， we conduct a comprehensive analysis under the guidance of the Carboniferous stratigraphic system based on outcrops. This analysis involves examining the lithologic assemblage features， seismic wave group characteristics， and stratigraphic contacts through the fine calibration of lithological properties， electrical properties， and seismic attributes. By comparing the Carboniferous strata in wells with the Carboniferous stratigraphic system based on outcrops in the mountainous area on the northwestern margin of the Junggar Basin， we establish the stratigraphic sequence profiles of the Carboniferous in the fault zone and conduct fine division and correlation of the strata. Additionally， we analyze dominant lithofacies in the Carboniferous strata based on the established Carboniferous stratigraphic framework. Key findings are as follows： （1） Drilling data from the Junggar Basin reveals that the Carboniferous strata in the Hongche fault zone can date back to the Late Carboniferous and consist of the Aladeyikesai （C）， Hala’alate （C）， and Chengjisihanshan （C） formations top to bottom. These strata demonstrate a westward overlapping and uplifting trend overall， resulting in a tectonic framework characterized by west-east zonation and north-south partition； （2） The C is composed of volcanic breccias of explosive facies. In contrast， the C and C exhibit overlapping and pinchout due to napping. Both formations exhibit decreasing denudation under explosion in the southern part， with the main body primarily presenting volcanic and clastic sedimentary facies； （3） In the Hongche fault zone， the primary oil-bearing pay intervals include the C and C， with volcanic breccias in the southern part and localized andesitic basalts serving as favorable targets for hydrocarbon exploration.

10.11743/ogg20240115