准噶尔盆地阜东斜坡区侏罗系层序地层学研究
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摘要
通过地震、钻测井及生物地层资料的综合研究 ,认为准噶尔盆地阜东斜坡区侏罗系发育 6套层序、两个构造层序。层序及沉积相空间分布的差异反映八道湾期至西山窑期以北部物源为主 ,下部构造层序揭示了北部抬升、南部均衡沉降的构造格局 ,头屯河期至喀拉扎期以南部物源为主 ,上部构造层序反映南部抬升、湖盆急剧收缩的构造格局。研究区主要发育冲积扇 -辫状河三角洲 -湖泊沉积体系 ,其次为曲流河 -三角洲 -湖泊沉积体系。早中侏罗世 ,本区以暖温带潮湿气候为主 ,但在三工河早期及头屯河中期有两次气候变干变热过程 ,晚侏罗世为亚热带干旱、半干旱气候 ,晚期的干旱气候还是导致湖盆急剧萎缩的重要因素。
On the basis of integrated studies of seismic data, cores, well logs and palaeontological stratigraphy of the East Fukang Slope, Junggar Basin, six stratigraphic sequences or two tectonic sequences are recognized from the Jurassic System of the study area. Difference of the spatial distribution of the sequences and sedimentary facies indicates that, from the period of Badaowan Formation to the period of Xishanyao Formation, the main sedimentary provenance was in the north of the basin. The lower tectonic sequence was characterised by uplifting of the north and relatively balanced subsidence of the south; but from Toutunhe Age to Kalazha Age, the south area was uplifted and became the main sedimentary provenance, and thus the lake basin area decreased abruptly.In the study area, there are two sedimentary systems. The main one is an alluvial fan braided river delta lake system, and the minor one is a meandering river datla lake system, both of which are developed along the short axis of the basin.From the early Jurassic Epoch to the middle Jurassic Epoch, Junggar Basin was dominated by warm humid climate, with two short hot and dry episodes in the Sangonghe and Toutunhe Period. In the late Jurassic stage, the climate became semi arid or arid, which had a great contribution to the decrease of the lake area.
On the basis of integrated studies of seismic data, cores, well logs and palaeontological stratigraphy of the East Fukang Slope, Junggar Basin, six stratigraphic sequences or two tectonic sequences are recognized from the Jurassic System of the study area. Difference of the spatial distribution of the sequences and sedimentary facies indicates that, from the period of Badaowan Formation to the period of Xishanyao Formation, the main sedimentary provenance was in the north of the basin. The lower tectonic sequence was characterised by uplifting of the north and relatively balanced subsidence of the south; but from Toutunhe Age to Kalazha Age, the south area was uplifted and became the main sedimentary provenance, and thus the lake basin area decreased abruptly.In the study area, there are two sedimentary systems. The main one is an alluvial fan braided river delta lake system, and the minor one is a meandering river datla lake system, both of which are developed along the short axis of the basin.From the early Jurassic Epoch to the middle Jurassic Epoch, Junggar Basin was dominated by warm humid climate, with two short hot and dry episodes in the Sangonghe and Toutunhe Period. In the late Jurassic stage, the climate became semi arid or arid, which had a great contribution to the decrease of the lake area.
引文
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2 况军 .地体拼贴与准噶尔盆地的形成演化 .新疆石油地质 ,1993,14( 2 ) :12 6～ 131
3 张国俊 ,况军 .准噶尔盆地腹部地区石油地质特征及找油前景 .新疆石油地质 ,1993,14( 3) :2 0 1～ 2 0 8
4 史宣玉等 .准噶尔盆地侏罗系沉积体系与油气关系 .新疆石油地质 ,1995,16( 3) :2 33～ 2 4 1
5 HamiltonDS ,TadrosNZ .Utilityofcoalseamsasgeneticstratigraphicsequenceboundariesinnonmarinebasin ,anexamplefromtheGunnedahBasinAustralia .AAPG ,1994 ,78( 2 ) :2 67～ 2 86
6 吴因业 .煤层———一种陆相盆地中的成因层序边界 .石油学报 ,1996,17( 4 ) :2 8～ 34
7 李思田等 .鄂尔多斯盆地东北部层序地层及沉积体系 .北京 :地质出版社 ,1992
8 顾家裕 .陆相盆地层序地层学格架概念及模式 .石油勘探与开发 ,1995,2 2 ( 4 ) :6～ 10
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