准噶尔盆地加快天然气勘探有利条件及预探领域分析

准噶尔盆地天然气资源十分丰富,勘探潜力巨大。该盆地具备形成大气区的地质背景,发育石炭系、二叠系、侏罗系三套气源岩,演化程度高,气源条件充足;发育多类型、多套储集体和四套区域盖层,形成了有利的储盖组合及成藏配置。通过对五彩湾、滴西、莫索湾、莫北地区典型气藏的分析研究,该盆地发育多种气藏类型,包括构造型、古潜山型、火山岩内幕型及地层(不整合遮挡)型。通过研究指出,天然气勘探的现实领域有陆东—五彩湾地区、陆西—莫北—莫索湾地区;待突破的领域有腹部下组合大型古隆起及岩性气藏、南缘冲断带;正在准备的勘探领域主要为煤层气。

Favorable Conditions of Expediting Gas Exploration and Pre-prospecting Targets Analysis in Junggar Basin

There are quite plenty of natural gas resources and huge potential for exploration in Junggar Basin. The basin possesses thefavorable geologic conditions to form large natural gas province. There are three sets of source rocks such as Carboniferous, Permianand Jurassic, which have high evolution degree, so gas source condition is plenteous. Multiple and multilayer reservoirs and fourregional covering strata upgrowth so that they form advantageous reservoir-cover combination and configuration of gas pools forming.By research of typical gas reservoirs distributed in Wucaiwan, Dixi, Mosuowan and Mobei areas, various types of gas reservoirs,including structural type, paleo-burial-hill type, volcanic inner-episode type and stratigraphic unconformity screened type, are developedin this basin. On the basis of study, it is pointed out that one practical domain, i.e. Ludong-Wucaiwan, Luxi-Mobei-Mosuowan areas;two breakthrough fields, which might be the large-scale structural traps in lower assemblage of the central basin and the foreland thrustbelt of southern margin in Junggar Basin, should be broken and one preparative realm for exploring gas-coalbed methane explorationshould be rapidly prepared to makeup or to supersede routine gas resources.