白音查干凹陷锡林好来地区下白垩统物源分析
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摘要
应用古地貌及沟谷展布特征、重矿物组合、岩屑类型及分布、地震反射结构、砂体展布等多种方法,对白音查干凹陷锡林好来地区下白垩统腾格尔组沉积时期的物源体系进行了研究。古地貌恢复与沟谷展布特征为判断沉积盆地的古物源体系提供了借鉴作用。锡林好来地区所在的盆地缓坡带分为斜坡带和断阶带2个单元,断阶带发育与盆地长轴方向平行的沟谷,南部斜坡带发育垂直于盆地走向的沟谷。受物源分异的影响,不同区域重矿物组合及岩屑类型差异较大,西部断阶带以花岗片麻岩等变质岩岩屑组合为主,东部达尔其西以片岩等变质岩岩屑占优势,南部斜坡带普遍含碳酸盐鲕粒、砂屑等内碎屑。研究区受来源于西、南部和东部3个不同方向的物源影响,来自西部的长轴方向物源对工区影响大,长轴三角洲体系的前缘为有利的隐蔽油藏勘探区。
Provenance system of sedimentary period of Lower Cretaceous Tenggeer Formation in Xilinhaolai Area of Baiyinchagan Depression is studied through the analysis of the features of palaeogeomorphology and valley distribution,heavy mineral assemblage,debrital rock type and distribution,seismic reflection configuration and sand body distribution.The palaeogeomorphic reconstruction and valley distribution features provide a reference for the analysis of paleo-provenance system of sedimentary basin.Gentle slope zone of the basin where Xilinhaolai Area is located in can be divided into the slope zone and fault zone.The valley developed in fault zone is parallel to the long axis of basin,and the valley developed in the southern slope zone is perpendicular to the long axis of basin.Heavy mineral assemblage and debris type are different in different areas because of the differential effect of provenance.The fault zone of western part is mainly the debris assemblage of metamorphic rock(granite gneiss).The western Daerqi Oilfield in eastern part is mainly the debris assemblage of metamorphic rock(shist).Intraclasts,i.e.carbonate oolite and debris,widely exist in the southern slope zone.The provenance from the western long axis direction has a great effect on work area due to the provenance effect of different directions from western,southern and eastern parts.Long-axis delta regime front is a beneficial exploration area of subtle reservoir.
Provenance system of sedimentary period of Lower Cretaceous Tenggeer Formation in Xilinhaolai Area of Baiyinchagan Depression is studied through the analysis of the features of palaeogeomorphology and valley distribution,heavy mineral assemblage,debrital rock type and distribution,seismic reflection configuration and sand body distribution.The palaeogeomorphic reconstruction and valley distribution features provide a reference for the analysis of paleo-provenance system of sedimentary basin.Gentle slope zone of the basin where Xilinhaolai Area is located in can be divided into the slope zone and fault zone.The valley developed in fault zone is parallel to the long axis of basin,and the valley developed in the southern slope zone is perpendicular to the long axis of basin.Heavy mineral assemblage and debris type are different in different areas because of the differential effect of provenance.The fault zone of western part is mainly the debris assemblage of metamorphic rock(granite gneiss).The western Daerqi Oilfield in eastern part is mainly the debris assemblage of metamorphic rock(shist).Intraclasts,i.e.carbonate oolite and debris,widely exist in the southern slope zone.The provenance from the western long axis direction has a great effect on work area due to the provenance effect of different directions from western,southern and eastern parts.Long-axis delta regime front is a beneficial exploration area of subtle reservoir.
引文
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[8]张志萍,林春明,李艳丽,等.内蒙古二连盆地白音查干凹陷达尔其地区下白垩统腾格尔组物源分析及沉积特征[J].古地理学报,2008,10(6):599-612.Zhang Zhiping,Lin Chunming,Li Yanli,et al.Sedimentarycharacteristics and provenance analysis of the Lower CretaceousTenggeer Formation in Daerqi Area of Baiyinchagan Sag,ErlianBasin,Inner Mongolia[J].Journal of Palaeogeography,2008,10(6):599-612.
[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].成都理工大学学报,2001,28(3):260-266.Zhao Junxing,Chen Hongde,Shi Zhiqiang.The way andimplications of rebuilding palaeogeomorphology:taking the research ofpalaeogeomorphology of the Ordos Basin before Jurassic deposition asexample[J].Journal of Chengdu University of Technology,2001,28(3):260-266.
[2]Weltje G J,Eynatten H V.Quantitative provenance analysis ofsediments:review and outlook[J].Sedimentary Geology,2004,171(1/2/3/4):1-11.
[3]Johnson C M,Winter B L.Provenance analysis of Lower Paleozoiccratonic quartz arenites of the North American midcontinent region:U-Pb and Sm-Nd isotope geochemistry[J].Geological Society ofAmerican Bulletin,1999,111(11):1723-1738.
[4]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.Zhao Hongge,Liu Chiyang.Approaches and prospects of provenanceanalysis[J].Acta Sedimentologica Sinica,2003,21(3):409-415.
[5]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.Xu Shutang,Ma Weimin,Wang Deren,et al.Sequence strata of LowerCretaceous in Baiyinchagan Depression,Erlian Basin[J].ActaSedimentologica Sinica,2004,22(4):644-650.
[6]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.Zhang Fushun,Fan Tailiang,Wang Shenglang,et al.The sequencestratigraphic framework and the filling style of BaiyinchaganDepression[J].Acta Geosicientia Sinic,2003,24(2):137-142.
[7]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):553-555.Zhang Fushun.Fan delta and braided delta sediments in BaiyinchaganDepression[J].Acta Geosicientia Sinica,2005,26(6):553-556.
[8]张志萍,林春明,李艳丽,等.内蒙古二连盆地白音查干凹陷达尔其地区下白垩统腾格尔组物源分析及沉积特征[J].古地理学报,2008,10(6):599-612.Zhang Zhiping,Lin Chunming,Li Yanli,et al.Sedimentarycharacteristics and provenance analysis of the Lower CretaceousTenggeer Formation in Daerqi Area of Baiyinchagan Sag,ErlianBasin,Inner Mongolia[J].Journal of Palaeogeography,2008,10(6):599-612.
[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].成都理工大学学报,2001,28(3):260-266.Zhao Junxing,Chen Hongde,Shi Zhiqiang.The way andimplications of rebuilding palaeogeomorphology:taking the research ofpalaeogeomorphology of the Ordos Basin before Jurassic deposition asexample[J].Journal of Chengdu University of Technology,2001,28(3):260-266.
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