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博格达地区中二叠统芦草沟组沉积相及沉积演化
张奎华,曹忠祥,王越,张关龙,薛雁,王圣柱,曲彦胜,汪誉新
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(1.中国石化胜利油田分公司勘探开发研究院,山东东营257015;2.中国石化胜利油田分公司,山东东营257001)
摘要:
博格达地区芦草沟组为准噶尔盆地南缘重要的烃源岩发育层段,前期沉积特征研究往往针对博格达山北侧泥页岩发育区或南侧柴窝堡凹陷砂砾岩发育区,缺乏对博格达地区整体性的研究。通过对博格达山周缘典型露头的芦草沟组进行详细观察和精细测量,结合柴窝堡凹陷钻井、测井、岩心资料,详细分析该区的地层特征、沉积相类型及分布特征,明确沉积演化过程。研究结果表明:博格达地区芦草沟组自下而上可划分为一段、二段、三段与四段,主要发育近岸水下扇、浊积扇与湖泊相沉积。在芦草沟组一段、二段沉积时期,近岸水下扇在柴窝堡凹陷广泛分布,浊积扇与半深湖亚相主要分布在博格达山以北;在芦草沟组三段、四段沉积时期,相对湖平面上升,近岸水下扇与浊积扇规模减小,半深湖、深湖亚相在研究区分布广泛,发育大规模的优质烃源岩。
关键词:  中二叠统  芦草沟组  沉积相  沉积演化  博格达山
DOI:10.13673/j.cnki.cn37-1359/te.2020.04.001
基金项目:中国石化科技攻关项目“准噶尔探区二、三叠系油气成藏条件及目标评价”(P19016)、“准东南地区二叠系油气地质条件及勘探潜力”(P18054),国家科技重大专项“准噶尔盆地及周缘泥页岩沉积层序特征”(2017ZX05036001-002)。
Sedimentary facies and evolution of Middle Permian Lucaogou Formation in Bogda area
ZHANG Kuihua,CAO Zhongxiang,WANG Yue,ZHANG Guanlong,XUE Yan,WANG Shengzhu,QU Yansheng,WANG Yuxin
(1.Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;2.Shengli Oilfield Company,SINOPEC,Dongying City,Shangdong Province,257001,China)
Abstract:
The Lucaogou Formation in Bogda area is an important hydrocarbon source rock in the southern margin of Junggar Basin. The early study of sedimentary characteristics often focused on the mud shale on the north side of Bogda mountain or the glutenite on the south side of Chaiwopu Sag. However,the studies on the integrity of Bogda area are insufficient.Based on the detail observation and measurement of Lucaogou Formation at the typical outcrop around Bogda mountain,combined with the well logging and core data in Chaiwopu Sag,the stratigraphic characteristics,types and distribution features of sedimentary facies in this area were analyzed in detail,and the sedimentary evolution process was defined. The results show that Lucaogou Formation in Bogda area can be divided into the first member,the second member,the third member and the fourth member from bottom to top,in which the main sedimentary facies of the nearshore subaqueous fan,turbidite fan,semi-deep lake and deep lake are developed. During the sedimentation of the first and the second member of Lucaogou Formation,the nearshore subaqueous fan was widely distributed in Chaiwopu Sag,the turbidite fan and the semi-deep lake were mainly distributed to the north of present Bogda mountain. During the sedimentation of the third and the fourth member of Lucaogou Formation,the scale of the nearshore subaqueous fan and the turbidite fan decreased as the relative lake level rose,and the semi-deep lake and deep lake facies were widely distributed in the studying area,resulting in the development of large-scale high quality source rocks.
Key words:  middle Permian  Lucaogou Formation  sedimentary facies  sedimentary evolution  Bogda mountain

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