博湖坳陷八道湾组层序格架下的沉积构成研究
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摘要
利用层序地层学、沉积学原理和方法,在充分使用露头、钻井(测井)和地震资料的基础上,对焉耆盆地博湖坳陷下侏罗统八道湾组进行了层序划分和沉积体系构成样式的研究。建立了焉耆盆地博湖坳陷下侏罗统八道湾组的层序地层格架,将其划分为3个三级层序,它们的层序构成样式主要受控于南部盆缘断裂和坳陷中部的种马场低凸起。种马场古隆起在此时期起到了分割南北沉积分区的作用。每个三级层序由以种马场低凸起为间隔的两个南厚北薄的箕状坳陷沉积构成,低位体系域砂体和高位体系域相对发育,湖扩体系域厚度较薄。在沉积体系构成上以三角洲-湖湾沼泽相的浅水沉积为主,湖泊水体深度不大且分布范围有限。在研究区识别出了南北两大物源体系,即北部主要以辫状河三角洲沉积为主,南部主要以扇三角洲沉积为主。
Based on the application of outcrops,well logs,and seismic data,and the principle and method of sequence stratigraphy and sedimentology sequence framework of Badaowan Formation(Jurassic) in Bohu Depression of Yanqi Basin,the architectural styles of sedimentary components were studied.Badaowan Formation(Jurassic) was divided into three 3-order sequences.The style of each sequence was controlled by fault activity of basin border and Zhongmachang low uplift.Zhongmachang paleolift partitioned south sedimentary zone from north zone in this period.Each of the 3-order sequences was constituted by two dustpan shape depressions with steep slope in the south and gentle slope in the north,which was partitioned by Zhongmachang paleolift.LST(lowstand system tract) and HST(highstand system tract) comparatively developed,and the EST(expansion system tract) thickness was thin.The main sedimentary facies are delt-bay swamp facies with shallow and limited water.Southern and northern sedimentary source systems are identified.The northern one mainly develops braided river delta sediments while the southern one mainly develops fan delta sediments.
Based on the application of outcrops,well logs,and seismic data,and the principle and method of sequence stratigraphy and sedimentology sequence framework of Badaowan Formation(Jurassic) in Bohu Depression of Yanqi Basin,the architectural styles of sedimentary components were studied.Badaowan Formation(Jurassic) was divided into three 3-order sequences.The style of each sequence was controlled by fault activity of basin border and Zhongmachang low uplift.Zhongmachang paleolift partitioned south sedimentary zone from north zone in this period.Each of the 3-order sequences was constituted by two dustpan shape depressions with steep slope in the south and gentle slope in the north,which was partitioned by Zhongmachang paleolift.LST(lowstand system tract) and HST(highstand system tract) comparatively developed,and the EST(expansion system tract) thickness was thin.The main sedimentary facies are delt-bay swamp facies with shallow and limited water.Southern and northern sedimentary source systems are identified.The northern one mainly develops braided river delta sediments while the southern one mainly develops fan delta sediments.
引文
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[2]袁政文,何明喜,宋建华等·新疆焉耆挤压逆冲型残留盆地与油气勘探[J]·石油实验地质,2004,26(1):11～16·
[3]陈文礼,焉耆改造型盆地特证及其油气勘探方向预测[J]·江汉石油学院学报,2003,25(2):4～5·
[4]刘新月,余培湘,李方清·焉耆盆地构造变形特征及成因分析[J]·煤田地质与勘探2004,32(6):5～8·
[5]袁政文,焉耆盆地构造演化分析[J]·江汉石油学院学报,2003,25(4):33～35·
[6]姚亚明,刘池阳,赵增录等·焉耆盆地构造演化与油气聚集[J]·新疆石油地质,2003,24(4):115～117·
[7]舒良树,郭召杰,朱文斌等·天山地区碰撞后构造与盆山演化[J]·高校地质学报,2004,10(3):393～404·
[8]吴富强,焉耆中生代原型盆地性质及形成机制[J]·新疆石油地质,1999,20(4):298～301·
[9]刘新月,李永林,何明喜等·焉耆中生代原型盆地沉积演化特征[J]·新疆石油地质,2002,23(2):130～133·
[10]韩玉戟,段心健,王斌等·焉耆盆地霍拉山逆冲推覆体及其演化[J]·河南石油,2005,19(1):4～5·
[11]邱荣华,陈文礼,林社卿等·焉耆盆地中生界层序地层和沉积体系分析[J]·地球科学——中国地质大学学报,2001,26(6):615～620·
[12]王华,赵忠新,陆永潮等·焉耆盆地博湖坳陷侏罗系层序格架及沉积学特征[J]·中南大学学报自然科学版,2006,37(suppl·1):42～46·
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