新疆库鲁克塔格-孔雀河地区震旦—寒武—奥陶系沉积相及生油岩特征

Sedimentary facies and source rocks of the Sinian-Cambrian-Ordovician strata in the Kuruktag-Konqi region, Xinjiang

关键词:  塔里木盆地  震旦—寒武—奥陶纪  沉积相  生油岩  新疆

Key words:  Tarim Basin  Sinian-Cambrian-Ordovician strata  sedimentary facies  source rock  Xinjiang

摘要:

根据地质剖面的精细研测,结合邻近地区的钻井、地震资料,对塔里木盆地东北部地区的震旦系-寒武-奥陶系岩石、古生物组合特征和沉积相、古地理环境以及有机地化特征等进行分析,指出该地区广泛分布的震旦系-寒武-奥陶系生油岩厚度巨大,具有很大的生烃潜力,建议在孔雀河及其南部邻区,加强油气勘探工作。

Abstract:

The Kuruktag-Konqi region is situated in the northeastern part of the Tarim Basin in Xinjiang. The integration of exposures, boreholes and seismic data have revealed the total thickness of about 600000 km² of the Upper Sinian to Silurian strata. The Upper Sinian strata are assigned to a sequence of clastic deposits occasionally intercalated with the intrabasinal deposits, with a thickness of about 650 m in the southern part of the Kuruktag region. The Cambrian strata consist of a sequence of carbonate rocks, siliceous rocks and shales, ranging from 300 to 400 m in thickness. The Ordo-vician strata are well developed, including a sequence of clastic rocks with a maximum thickness of more than 7000 m. The Silurian strata are made up of littoral coarse-grained deposits, with a maximum thickness of more than 2400 m. It can be seen that the tremendous thickness of the Sinian-Cambrian-Ordovician strata may be thought to have good hydrocarbon potential. It is proposed that the petroleum exploration should be improved in and to the south of the Konqi region.