从古气候探讨新疆北部石炭—二叠纪生油层位

不同沉积矿产的形成经常有不同的古气候背景。石油的生成与炎热气候关系密切。炎热气候和长期稳定的还原环境对油气的形成最有利。新疆北部早石炭世、早二叠世处于炎热气候条件下 ,克拉麦里以南的南准噶尔在晚石炭世也基本处于炎热气候条件下。早石炭世晚期北准噶尔、伊犁地区都有稳定的弱氧化环境下的碳酸盐沉积 ,早石炭世晚期—晚石炭世早期的准噶尔 ,晚石炭世—早二叠世早期准噶尔南缘、西北缘海相沉积都有深水宁静的还原环境。早二叠世晚期准噶尔南缘、东准噶尔、吐鲁番有深水湖泊。上述地区和层位对生油是有利的

PALEOCLIMATIC DISCUSSION ON CARBONIFEROUS-PERMIAN OIL-GENERATING STRATA IN THE NORTHERN XINJIANG

Different sedimentary minerals are formed in different paleoclimatic environment.The genera- tion of oil is closely related with arid climates.The arid climate and long- time stable reduction environment are the most favorable conditions for the generation of oil.During the early Carboniferous and early Permian the northern Xinjiang was in a condition of arid climate.The southern Junggar south of Karamaili was basi- cally in a condtion of arid climate during the late Carboniferous.Carbonate sediments of stable slight- oxida- tion environment occured in the northern Junggar and Ili area during the late Early Carboniferous.Marine sediments of quiet deep- water reduction environment appeared in the western Junggar during the late Early Carboniferous to early L ate Carbonifeous,and in the southern and northwestern margin of Junggar during the late Carboniferous to early Early Permian.Deep- water lakes occured in the southern margin of Junggar, eastern Junggar and Turpan during the late Early Permian.The above- mentioned regions and strata are fa- vorable to the generation of oil.