准噶尔盆地南缘冲断带侏罗系喀拉扎组沉积特征

doi:10.7657/XJPG20210401

摘要/Abstract

摘要：

为明确准噶尔盆地南缘冲断带深层储集层特征,在露头剖面观测基础上,结合录井、微量元素及重矿物资料,对准噶尔盆地南缘侏罗系喀拉扎组沉积相标志、沉积相类型、物源方向、沉积相展布及沉积模式开展研究。研究区喀拉扎组主要发育冲积扇和辫状河三角洲2种沉积相,平面上发育3个大型沉积体系,自西至东分别是齐古断褶带中段的冲积扇—辫状河三角洲沉积体系、齐古断褶带东段头屯河地区的辫状河三角洲沉积体系和阜康断裂带的辫状河三角洲沉积体系;纵向上,喀拉扎组表现为进积沉积序列,自下而上发育4个沉积旋回。喀拉扎组沉积相类型及平面展布主要受侏罗纪晚期天山造山带活动的控制,3个大型沉积体系在盆地内部形成了厚度超过200 m的砂岩储集层,特别是辫状河三角洲前缘砂体分选好,厚度大,分布面积广,可与深层大型背斜构造相匹配,成为有利的勘探目标区。

关键词: 准噶尔盆地, 南缘冲断带, 侏罗系, 喀拉扎组, 冲积扇, 辫状河三角洲, 沉积相, 沉积模式

Abstract:

In order to clarify the characteristics of deep reservoirs in the thrust belt on the southern margin of the Junggar basin, the markers, types, distribution and models of sedimentary facies and source directions of the Jurassic Kalazha formation were analyzed based on the data of outcrops, mud logging, trace elements and heavy minerals. The result shows that the sedimentary facies of alluvial fan and braided river delta are mainly developed in Kalaza formation. Laterally three large sedimentary systems are distributed from west to east, which are the alluvial fan-braided river delta in the middle section of the Qigu fault-fold belt, the braided river delta in the Toutunhe area in the eastern section of the Qigu fault-fold belt, and the braided river delta in the Fukang fault belt. Vertically, there are four sedimentary cycles which follow a prograding sequence. The types and planar distribution of the sedimentary facies are mainly controlled by the activities of the Tianshan orogenic belt during the late Jurassic period. Sandstone reservoirs of more than 200 m thick are developed on the three large sedimentary systems. Especially, the sandstone reservoirs in the braided river delta front are very sortable, thick and widely distributed, which match well with the deep large anticline and can be favorable exploration targets.

Key words: Junggar basin, thrust belt of the southern margin, Jurassic, Kalazha formation, alluvial fan, braided river delta, sedimentary facies, sedimentary model

中图分类号:

TE121.3

司学强, 袁波, 彭博, 冀冬生, 郭华军, 唐雪颖, 窦洋, 李亚哲. 准噶尔盆地南缘冲断带侏罗系喀拉扎组沉积特征[J]. 新疆石油地质, 2021, 42(4): 389-398.

SI Xueqiang, YUAN Bo, PENG Bo, JI Dongsheng, GUO Huajun, TANG Xueying, DOU Yang, LI Yazhe. Sedimentary Characteristics of Jurassic Kalazha Formation in the Thrust Belt on the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(4): 389-398.

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