准噶尔盆地玛湖凹陷及周缘深大构造有效储层及烃类相态分析

摘要/Abstract

摘要： 准噶尔盆地玛湖凹陷及周缘石炭系、下二叠统发育一系列大型背斜、断背斜构造，处于玛湖凹陷下二叠统风城组优质烃源灶中心及周缘，成藏条件优越，是准噶尔盆地深层油气勘探的重要领域。然而，这些构造埋藏普遍较深，目的层是否发育规模有效储层、烃类相态是否为气相是影响该领域勘探开发潜力的两大关键问题。通过航磁异常处理解释、地震层速度分析、烃源岩演化及天然气成因分类等综合分析，认为玛北背斜、达1 井背斜、玛湖背斜中北部发育火山岩风化壳储层。综合风城组烃源岩演化阶段、背斜构造空间位置、原油裂解深度等，预测玛北背斜、玛湖背斜烃类相态为干酪根裂解气，达1 井背斜为油气共生，玛南背斜以气为主。

关键词: 准噶尔盆地, 玛湖凹陷, 深大构造, 有效储层, 烃类相态, 准噶尔盆地, 玛湖凹陷, 深大构造, 有效储层, 烃类相态

Abstract: In Junngar Basin, a series of large anticliens and faulted anticlinal structures are developed in Carboniferous and Lower Permian in Mahu sag and its periphery. They are distributed at the center of of high-quality hydrocarbon kitchen of the Lower Permian Fengcheng Formation and its perihery in Mahu sag, where the conditions of resrvoir formation superior, so they are important exploration areas of deep oil and gas in Junggar Basin. Due to the deeper burial depth of these structures, however, the exploration and development potential in these areas is mainly affected by the following two aspects. The first is whether effetive reservoirs are developed in a large scale in the target layers. And the second is whether it is gas-phase hydrocarbon. It is indicated from comprehensive analysis of aeromagnetic anomaly processing and interpretation, seismic horizon velocity analysis, source rock evolution and natural gas genetic classification that volcanic weathering crust reservoirs are developed at Mabei anticline, Well Da 1 anticline and central-northern Mahu anticline. Based on evolution stages of Fengcheng Formation source rocks, spatial locations of anticlinal structures and oil cracking depth, it is predicted that the hydrocarbon phase is kerogencracking gas in Mabei and Mahu anticlines, oil-gas paragenesis in Well Da 1 anticline and dominantly gas in Manan anticline.

Key words: hydrocarbon phase, Junggar Basin, Mahu sag, discordogenic structure, effective reservoirs, hydrocarbon phase, Junggar Basin, Mahu sag, discordogenic structure, effective reservoirs

卫延召, 　陈刚强, 　王峰, 　卞保力, 　吴爱成, 　杨帆, 　杨春, 　杨辉. 准噶尔盆地玛湖凹陷及周缘深大构造有效储层及烃类相态分析[J]. 中国石油勘探, 2016, 21(1): 53-60.

Wei Yanzhao, Chen Gangqiang, Wang Feng, Bian Baoli, Wu Aicheng, Yang Fan, Yang Chun, Yang Hui. reservoirs in marginal reefs of carbonate tableland[J]. China Petroleum Exploration, 2016, 21(1): 53-60.

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