新疆石油地质 ›› 1994, Vol. 15 ›› Issue (1): 1-9.

• •    下一篇

准噶尔盆地西北缘三叠—侏罗系隐蔽油气圈闭勘探

丘东洲   

  1. 中国地质科学院成都地矿研究所 成都 610082
  • 收稿日期:1993-05-10 出版日期:1994-03-01 发布日期:2020-08-06
  • 作者简介:研究员 教授 石油地质学 沉积岩石学

EXPLORATION OF THE CONCEALED OIL-GAS TRAP OF TRIASSIC-JURASSIC IN NORTHWESTERN MARGIN OF JUNGGAR BASIN

Qiu Dongzhou   

  1. Professor, Petroleum Geology Sedimentographg, Chengdu Institute of Geology and Mineral Resources, Chinese Acaderny of Geological Sciences, Chengdu, Sichuan 610082
  • Received:1993-05-10 Online:1994-03-01 Published:2020-08-06

摘要: 准噶尔盆地西北缘地区的东南斜泼带三叠—侏罗系背斜、断裂等构造不甚发育,但沉积相类型声(有旱地扁、湿地扁、瓣状河、曲流河、网结河、扇三角洲、瓣状河三角洲、曲流河三角洲、湖泊等9个相,30个亚相和近百个微相),相变频繁,碎屑岩不稳定组分较多,成岩作用类型且变化大。此外,地层尖灭、超覆、不整合等十分发育,使本区具备了形成隐蔽油气圈闭的基本地质条件。在西北缘三叠—侏罗系中可能存在着四种隐蔽圈闲类型:地层型、岩性型、古地貌型、混合型。从西北缘的构造、沉积特征分析,在克—乌断裂、乌—夏断裂的南北都有隐蔽油气圈闭的发育区,其中最有利的地区应是拐114井–241井—百65井–134井–夏40井以南的玛湖蚴陷的北斜坡带。

关键词: 准噶尔盆地西北缘, 隐蔽泊气圈, 沉积相, 油气藏类型

Abstract: The anticline, fault and other structures of Triassic — Jurassic have not very developed in the southeastern slope zone of the northwestern margin of Junggar Basin. but there are nine types of sedimentary facies, thirty subfacies and nearly one hundred microfacies. They are arid fan. humid fan. braided river, meandering river, anastomosed river. fan-delta. braided delta. lacustrine delta and lacustrine floor fan. etc. The changes of lithofacies are frequent. and there are lots of unstable components and types of diagenesi with greatly changes in the elastic rock. Also. there were well developed stratigraphic pinch out, overlap. and unconformity. which make the area have the essiential geologic conditions that formed the concealed oil-gas trap. There were four types of concealed traps.perhaps existing in Trassic-Jurassic of the lithological trap. paleomorphologic trap and mixed trap. According to analysis of structural and s叫1- mentary characteristics of the northwestern margin in Junggar Basin, there were all concealed oil-gas trap in north and south of Karamay-Wuerhe fault and Wuerhe Xiazigai fault. but the most favorable are should be north slope zone of Manas Lake depression to south of Well Guaill4-Well241--Well Ba.165 —Well134 Well Xia40.

Key words: Northwestern margin of Junggar Basin, Concealed oil gas trap, Sedimentary facies, Oil -gas pool type