吐哈侏罗纪原型盆地演化对烃源岩分布的控制

吐哈侏罗纪原型盆地演化主要表现为早、中侏罗世断陷盆地向晚侏罗世挤压再生前陆盆地转变。原型盆地演化控制了这一时期的大地构造格局,古地理环境发生改变,古气候条件相应调整,在这样特殊的古地貌背景下沉积了该时期重要的烃源岩层。早、中侏罗世,吐哈盆地沉积了温暖、潮湿气候条件下的河湖、沼泽相层系,其中广阔湖相沉积的暗色泥岩、炭质泥岩及煤层成为该时期最重要的烃源岩;晚侏罗世,盆地接受干旱气候条件下的山麓河流相沉积,很少有烃源岩。中、下侏罗统八道湾组和西山窑组含煤岩系是盆地内的主力烃源岩,中侏罗统七克台组湖相至半深湖相沉积,是盆地内的次要烃源岩。

The Evolution of Turpan-Hami Jurassic Prototype Basin and its Control on the Distribution of Source Rocks

The prototype of Turpan-Hami Basin mainly evolved from the Early Middle Jurassic rift basin into Late Jurassic foreland basin during Jurassic period.The prototype of basin evolution of this period controlled the tectonic sedimentary patterns,changed the ancient geography,ancient climate conditions adjusted accordingly,and in this particular context of the ancient landscapes of the period deposited a series of important hydrocarbon source rock.Early in the Jurassic period,under the warm and humid climates,the Turpan-Hami Basin deposited rivers and lakes,swamp layer system,in which the vast deposits of dark lacustrine mudstone,carbonaceous mudstone and coal became the most important source rocks.Late Jurassic,the basin changed into the foothills and fluvial deposition under the arid climate conditions,with little hydrocarbon source rocks.The Lower and Middle Jurassic Badaowan and Xishanyao Coal Measures are the main source rocks of this period,Middle Jurassic Qiketai lacustrine deposition to semi-deep lake deposition,is a secondary hydrocarbon basin source rock.