Yanshanian Tectonic Inversion and the Response of Sequence Stratigraphic Patterns in Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin
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摘要: 通过钻井、测井与地震数据,依据不整合面分析、断层活动速率分析与地层的"负向结构"分析,在义和庄凸起东部燕山期内识别出一期发生于中晚侏罗世之交的构造负反转,并据此将义和庄凸起燕山期划分为早期与晚期两个阶段.通过单井与连井层序地层分析,分别建立了燕山早期与晚期的层序地层样式,两者在层序结构及内部沉积充填等方面表现出巨大差异.早期层序地层不具有显著的沉积厚度分异,且格架内部充填河流相沉积;晚期因构造负反转而形成小型拉张断陷盆地,沉积厚度分异明显,内部以扇三角洲沉积充填为主,呈现出对构造负反转的显著响应.燕山期构造-层序地层学的研究可为中国东部其他具有相似构造背景盆地前新生代的油气勘探提供借鉴.Abstract: Through boreholes, well logs and seismic profiles, one tectonic inversion happening between Middle Jurassic and Late Jurassic is recognized in Yanshanian eastern Yihezhuang salient based on analyzing unconformity surfaces, faulting activity and the negative structure of strata, which divides the Yanshanian of eastern Yihezhuang salient into Early Yanshanian and Late Yanshanian in this study. The sequence stratigraphic patterns of Early Yanshanian and Late Yanshanian are respectively established with analysis of single-well sequence stratigraphy and connecting-well sequence stratigraphy, which shows great difference in sequence structure and internal makeup with each other. During early Yanshanian, the sequence stratigraphy showed unobvious thickness differentiation and the sequence-infill were fluvial facies. Differently, the sequence stratigraphy presented obvious thickness differentiation and was infilled mainly with fan deltas, as the tectonic inversion led to development of small rifted-basin, which showed obvious response to the recognized tectonic inversion. Applying tectonic-sequence stratigraphy to Yanshanian succession could contribute to the pre-Cenezoic hydrocarbon exploration of the basins with similar tectonic background in eastern China.
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Key words:
- Yanshanian /
- tectonic unconformity /
- tectonic inversion /
- sequence stratigraphy /
- sedimentology
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图 2 渤海湾盆地济阳坳陷义和庄凸起东部地层划分与盆地充填演化
据张善文等(2009)修改
Fig. 2. The stratigraphic division and basin filling evolution of the eastern Yihezhuang salient, Jiyang depression, Bohai Bay basin
图 3 义和庄凸起东部三维地震剖面层序界面识别
地震测线A-A′,位置见图 1
Fig. 3. Recognition of sequence boundaries (sb) on the 3D seismic profile across eastern Yihezhuang salient
图 4 钻井层序地层界面识别
a.Tmz3界面上下岩性、测井曲线等发生显著变化.界面以下为厚层泥岩夹薄层粉砂质沉积,测井曲线呈齿型,岩性变化较快; 界面之上为厚层砂岩沉积,测井曲线为箱型-钟型,为河道边滩沉积,对下伏地层造成冲刷;b.Tg界面之上为厚层含砾砂岩沉积, 测井曲线呈漏斗型-钟型, 为河道边滩沉积; 界面之下为泥岩与砂岩的薄互层, 测井曲线呈低幅齿型.Tg界面上下岩性、测井曲线形态发生显著变化.Tg为河道冲刷面,可构成层序界面;c.Tg界面上下最显著的差异是沉积物颜色发生明显变化,Tg界面之下为泥岩与砂岩薄互层沉积,并夹煤层,沉积物颜色为灰色,指示还原环境;界面之上为厚层泥岩夹薄层砂岩沉积,沉积物颜色为紫红色,指示氧化环境;井位置见图 1
Fig. 4. Recognition of sequence boundaries (sb) on boreholes
图 5 济阳坳陷义和庄凸起东部燕山期层序地层格架
地震测线B-B′,位置见图 1
Fig. 5. Yanshanian sequence stratigraphic framework of eastern Yihezhuang salient, Jiyang depression
图 6 义和庄凸起东部各构造不整合面的地震反射特征
地震测线C-C′,位置见图 1;Tg2.沉积基底;Tg.中生界底界面;Tgm.上侏罗统底界面;Tr.新生界底界面
Fig. 6. Characteristics of seismic reflections of tectonic unconformities in eastern Yihezhuang salient
图 9 D4单井层序地层分析
MFS.最大洪泛面; TS.初始洪泛面; SB.层序界面; LST.低位体系域; EST.扩展体系域; HST.高位体系域.井位置见图 1
Fig. 9. equence stratigraphic analysis of Well D4
图 11 义和庄凸起东部燕山早期连井层序地层分析(岩性图例同图 10)
Fig. 11. Early Yanshanian sequence stratigraphic analysis of connecting-wells in eastern Yihezhuang salient
图 10 D5单井层序地层分析
UST.削截型不整合面; TS.初始洪泛面; SB.层序界面; LST.低位体系域; EST.扩展体系域.井位置见图 1
Fig. 10. Sequence stratigraphic analysis of Well D5
图 12 义和庄凸起东部燕山晚期连井层序地层分析(岩性图例同图 10)
Fig. 12. Late Yanshanian sequence stratigraphic analysis of connecting-wells in eastern Yihezhuang salient
图 13 义和庄凸起东部燕山早期(坊子组与三台组同沉积期)垂向层序地层样式(岩性图例同图 10)
Fig. 13. Early Yanshanian (syndepositional period of Fangzi Formation and Santai Formation) vertical sequence stratigraphic patterns in eastern Yihezhuang salient
图 14 义和庄凸起东部燕山晚期(蒙阴组同沉积期)垂向层序地层样式(岩性图例同图 10)
Fig. 14. Late Yanshanian (syndepositional period of Mengyin Formation) vertical sequence stratigraphic patterns in eastern Yihezhuang salient
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