【摘要】 塔北三叠系主要分布于库车坳陷、阿瓦提-满加尔坳陷及塔北断块隆起的局部地区,沉积厚达1250—2000m。跃参1井、沙参1井和阿参1井的三叠系满加尔群经详细研究,可分为上、中、下三组和7个孢粉化石组合。在阿瓦提-满加尔坳陷中,由西向东三叠系的暗色岩增多、增厚,生油地化指标变好,并已进入低成熟阶段,沙参2井的原油中就有三叠纪孢粉化石。因而认为三叠系是塔北的比较重要的生油层,而塔北断块隆起及其南侧的阿瓦提-满加尔坳陷北缘背斜带,则可能是油气富集带。更多还原

【Abstract】 Triassic system is mainly distributed in Kuqa,Awat-Mangar depressionsand locally in the north Tarim fault-block uplift.In the north part of Kuqadepression and the east part of Awat-Magar depression,Triassic sediments arefound to be 2,000m and 1,250m thick respectively.Through a detailed inves-tigation,the Triassic sediments revealed by wells of Yuecan-1,Shacan-1 andAcan-1 are termed the“Mangar Group”(Tmn).This group can be further divi-ded into 3 formations and 7 sporo-pollen assemblages.Among them,dark rocksbecome thicker from west to east,accordingly their geochemical indices aremore favourable for oil generation,and kerogen of which had reached low ma-ture stage.Crude oil collected from well Shacan-2 contains Triassic sporo-pollon.Thus Triassic sediments in north Tarim are considerably importantsource rocks,and Mangar depression should be a favourable broad regionfor oil generation. The author suggests that north Tarim fault-block uplift located at the higherpart between Kuqa and Awat-Mangar depressions,is favourable for oil accu-mulation and migration.Paleozoic anticlines existed in the fault-block upliftand in the northern margin of Awat-Mangar depression may be the hydro-carbon enrichment zones.更多还原