准噶尔盆地西北缘三叠－侏罗系隐蔽油气圈闭勘探  

EXPLORATION OF THE CONCEALED OIL一GAS TRAP OF TRIASSIC一JURASSIC IN NORTHWEsTERN MARGIN OF JUNGGAR BASIN

作　　者：丘东洲[1] 

机构地区：[1]中国地质科学院成都地矿研究所

出　　处：《新疆石油地质》1994年第1期1-9,共9页Xinjiang Petroleum Geology

摘　　要：准噶尔盆地西北缘地区的东南斜坡带三叠—侏罗系背斜、断裂等构造不甚发育，但沉积相类型多（有旱地扇、湿地扇、辫状河、曲流河、网结河、扇三角洲、辫状河三角洲、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，成岩作用类型多且变化大。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闭类型：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蟛—夏４０井以南的玛湖坳陷的北斜坡带。The anticline,fault and other structures of Triassic一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 char1ges of lithofacies ate frequent.and there are lots of unstable components and types of diagenesis with greatly changes in the clastic 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.perhapexl stiring Trassic-Jurassic of the lithological trap.paleomorphologic trap and mixed trap.According to analysis of structural and sedi-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 area should be north slope zone of Manas Lake depression to south of Well Guai114一well 241一Well Base一Well134一Well Xia40.

关 键 词：油气藏 圈闭 勘探 三叠纪 

分 类 号：P618.130.8[天文地球—矿床学]