【摘要】 库盆地吉迪组分布十分广泛,它是储油层和油、气田的盖层,主要由碎屑岩或碎屑岩与石膏岩的互层组成,沉积厚度301.4-1081m。这套地层中富含有孔虫、介形类、抱粉、轮藻和腹足类等化石,通过古生物群的分折研究,可确定其沉积时代为中新世,更确切地说为中新世早、中期。通过沉积物特征和古生物群中广海、底栖有孔虫,咸水型介形类,水生植物抱粉和沟鞭藻等门类的分析,大致可确定沉积物的物源主要来自盆地北部的南天山山脉。沉积物颗粒自北向南由粗变细,水体中的含盐度自西向东逐渐升高,沉积了石膏、石盐和钙芒硝等盐类物质;推测在中新世早、中期库车盆地可能与塔里木盆地西部的喀什-乌恰-带残留海相连通。更多还原

【Abstract】 Jidike formation distributed very widely in Kuche Basin. It’s oil reservoir bed and caprock of oil and natural gas field, and primarily consisted of clastic rocks or interbed of clastic rocks and gypsum rocks, depositional thickness 301.4-1081m. In this set of strata, there are abundant fossils, such as Foraminiferida, Ostracoda, Sporo - pollen, Charophyta and Gastropoda etc., and through analyse and research on paleobiota may be defined depositional age of it belongs to Miocene Epoch and more exactly says early - middle stage of Miocene E-poch. Through analyse on properties of sediment and marine benthonic Foraminiferida, saltwater Ostracoda, Sporo-pollen of water plant and Dinoflagellates etc. of paleobiota, may be determined roughly the material source of sediments come from mainly southern Tianshan mountain of northern barin. Towards the south fromnorth, the particles of sediments from coarse to thin, and from west to east, the content of salt in water body increased gradually, and formed salty sediments such as gypsum, halite and Calcimirabilite bed etc. Infer that during early to middle stage of Miocene E-poch, Kuche Basin may be connected with the remanent sea in Kashi - Wugia zone of western Tarim Basin.更多还原