白音查干凹陷缓坡带多物源方向及其模式探讨
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摘要
利用地震反射结构、沟谷展布特征及岩石碎屑中轻—重矿物组合类型等研究成果,探讨了白音查干凹陷缓坡带西部下白垩统多物源模式。研究结果表明:白音查干凹陷缓坡带下白垩统地震相呈东西分带的特点,西部和东部发育前积反射,中部反射振幅相对较弱;西部物源充足,扇体规模相对较大。砂岩中的重矿物组合及碎屑组份在平面上差异性明显,南部以岩屑砂岩为主,西部、东部为长石岩屑砂岩;西部岩屑以花岗片麻岩为主,东部以片岩等变质岩岩屑占优势,南部含碳酸盐内碎屑等。缓坡带西部存在3个方向的物源,分别是沿盆地长轴方向的西部物源、短轴的南部物源和东南部物源。在盆地演化的早期短轴物源占主导,中后期长轴物源影响较大。
Based on the seismic reflection,features of palaeogeomorphology and distribution of valley as well asthe combination types of light-heavy mineral in rock fragment,the direction and pattern of multi-provenance ofthe lower Cretaceous in the western gentle slope belt,Baiyinchagan Depression have been studied. The researchshows that seismic facies of lower Cretaceous in Xilinhaolai area,gentle slope belt of Baiyinchagan depression canbe divided into three types. The west east is dominated by the oblique crossing propagational reflections,whilereflection amplitude in the middle region is weaker comparatively. Provenance in the west is abundant and thus thefan scale is larger relatively. Both the heavy mineral combinations and debris components of sandstone in differentarea are different. Sandstone in the south is dominated by lithic sandstone,while the west and the east are dominatedby feldspar lithic sandstone;lithic of the western sandstone is mainly granite gneiss,while the eastern one is mainlymetamorphic lithic such as schist,yet the southern one contains intracoastal such as ooid,carbonate and so on. It isbelieved that there are three provenances in the western gentle slope belt including the western one along the longaxis,the southern one along the short axis and the eastern one. The short axis provenance prevails in the early timeof the basin evolution,yet it changes to be the long axis provenance in the middle and late time.
Based on the seismic reflection,features of palaeogeomorphology and distribution of valley as well asthe combination types of light-heavy mineral in rock fragment,the direction and pattern of multi-provenance ofthe lower Cretaceous in the western gentle slope belt,Baiyinchagan Depression have been studied. The researchshows that seismic facies of lower Cretaceous in Xilinhaolai area,gentle slope belt of Baiyinchagan depression canbe divided into three types. The west east is dominated by the oblique crossing propagational reflections,whilereflection amplitude in the middle region is weaker comparatively. Provenance in the west is abundant and thus thefan scale is larger relatively. Both the heavy mineral combinations and debris components of sandstone in differentarea are different. Sandstone in the south is dominated by lithic sandstone,while the west and the east are dominatedby feldspar lithic sandstone;lithic of the western sandstone is mainly granite gneiss,while the eastern one is mainlymetamorphic lithic such as schist,yet the southern one contains intracoastal such as ooid,carbonate and so on. It isbelieved that there are three provenances in the western gentle slope belt including the western one along the longaxis,the southern one along the short axis and the eastern one. The short axis provenance prevails in the early timeof the basin evolution,yet it changes to be the long axis provenance in the middle and late time.
引文
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[15]Hallsworth C R,Chisholm J I.Provenance of late Car-boniferous sandstones in the Pennine Basin(UK)fromcombined heavy mineral,garnet geochemistry andpalaeocurrent studies[J].Sedimentary Geology,2008,203(2):196–212.
[16]Eynatten H V,Reinhard G.Provenance of Cretaceoussynorogenic sandstones in the Eastern Alps:constraintsfrom framework petrography,heavy mineral analysisand mineral chemistry[J].Sedimentary Geology,1999,124(1):81–111.
[17]Weltje G J,Eynatten H V.Quantitative provenance analy-sis of sediments:review and outlook[J].Sedimentary Ge-ology,2004,171(1):1–11.
[18]Johnson C M,Winter B L.Provenance analysis of lowerPaleozoic cratonic quartz arenites of the North Americanmidcontinent region:U-Pb and Sm-Nd isotope geochem-istry[J].Geological Society of American Bulletin,1999,111(11):1723–1738.
[19]王若谷,李文厚,廖友运,等.鄂尔多斯盆地胡尖山地区长9—长8油层组物源及沉积体系分析[J].西安石油大学学报:自然科学版,2010,25(5):10–15.
[20]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409–415.
[2]张福顺,樊太亮,王生朗,等.白音查干凹陷层序地层格架及充填样式[J].地球学报,2003,24(2):137–142.
[3]许书堂,马维民,王德仁,等.二连盆地白音查干凹陷下白垩统层序地层研究[J].沉积学报,2004,22(4):644–650.
[4]张福顺.白音查干凹陷扇三角洲与辫状河三角洲沉积[J].地球学报,2005,26(6):553–556.
[5]林春明,张志萍,李艳丽,等.二连盆地白音查干凹陷早白垩世腾格尔组沉积特征及物源探讨[J].高校地质学报,2009,15(2):226–239.
[6]李金良.白音查干凹陷层序地层研究与有利区带预测[D].北京:中国地质大学(北京),2003.
[7]张亚敏,靳广兴.二连盆地白音查干凹陷成藏动力系统与油气勘探[J].新疆石油地质,2010,33(3):225–228.
[8]焦养泉,李珍,周海民.沉积盆地物质来源综合研究以南堡老第三纪亚断陷盆地为例[J].岩相古地理,1998,18(5):16–20.
[9]赵俊兴,陈洪德,时志强.古地貌恢复技术方法及其研究意义以鄂尔多斯盆地侏罗纪沉积前古地貌研究为例[J].成都理工学院学报,2001,28(3):260–266.
[10]王家豪,王华,赵忠新,等.层序地层学应用于古地貌分析以塔河油田为例王[J].地球科学中国地质大学学报,2003,28(4):425–430.
[11]赵俊兴,陈洪德,向芳.高分辨率层序地层学方法在沉积前古地貌恢复中的应用[J].成都理工大学学报:自然科学版,2003,30(1):76–81.
[12]纪友亮,蒙启安,曹瑞成,等.贝南凹陷古地形对层序结构及沉积充填的控制[J].同济大学学报:自然科学版,2009,37(11):1541–1545.
[13]王敏芳,李平平.地质学方法估算准噶尔盆地西山窑组剥蚀厚度[J].地球科学与环境学报,2007,29(1):30–33.
[14]MortonA,HurstA.Correlationofsandstonesusingheavyminerals:an example from the Statfjord Formation of theSnorre Field,northern North Sea[J].London:GeologicalSociety Special Publication,1995,89:3–22.
[15]Hallsworth C R,Chisholm J I.Provenance of late Car-boniferous sandstones in the Pennine Basin(UK)fromcombined heavy mineral,garnet geochemistry andpalaeocurrent studies[J].Sedimentary Geology,2008,203(2):196–212.
[16]Eynatten H V,Reinhard G.Provenance of Cretaceoussynorogenic sandstones in the Eastern Alps:constraintsfrom framework petrography,heavy mineral analysisand mineral chemistry[J].Sedimentary Geology,1999,124(1):81–111.
[17]Weltje G J,Eynatten H V.Quantitative provenance analy-sis of sediments:review and outlook[J].Sedimentary Ge-ology,2004,171(1):1–11.
[18]Johnson C M,Winter B L.Provenance analysis of lowerPaleozoic cratonic quartz arenites of the North Americanmidcontinent region:U-Pb and Sm-Nd isotope geochem-istry[J].Geological Society of American Bulletin,1999,111(11):1723–1738.
[19]王若谷,李文厚,廖友运,等.鄂尔多斯盆地胡尖山地区长9—长8油层组物源及沉积体系分析[J].西安石油大学学报:自然科学版,2010,25(5):10–15.
[20]赵红格,刘池洋.物源分析方法及研究进展[J].沉积学报,2003,21(3):409–415.
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