塔里木盆地顺托果勒低隆起一间房组分布及地质意义

Distribution and significance of Middle Ordovician Yijianfang Formation in Shuntuoguole lower uplift, Tarim Basin

尚凯 吕海涛 曹自成 韩俊 龚伟 黄诚

SHANG Kai LÜ Haitao CAO Zicheng HAN Jun GONG Wei HUANG Cheng

中国石化 西北油田分公司 勘探开发研究院, 新疆 乌鲁木齐 830011

Exploration and Production Research Institute of SINOPEC Northwest Oilfield Branch Company, Urumqi, Xinjiang 830011, China

在塔里木盆地顺托果勒低隆起相关钻井中获得了中奥陶世达瑞威尔期牙形石化石，由老到新分别为Eoplacognathus suecicus、Pygodus anitae和Pygodus serrus组合，为该区主要目的层之一的一间房组划分对比提供了较为详细的标准生物化石依据。同时，综合碳同位素地层、岩电特征和地震等资料，讨论了一间房组地层发育特征。在此基础上，通过连井地层划分对比和地震层位解释追踪，厘定了一间房组的分布范围。研究认为，一间房组在顺托果勒低隆起广泛分布，厚度为140～220 m，SN1-ST1井区厚度最大，超过了200 m。研究区一间房组—恰尔巴克组之间为连续沉积，不存在剥蚀不整合面，不具备发育加里东中期古喀斯特的地质条件。

The Middle Ordovician Darriwilian stage conodonts have been recovered from key wells in the Shuntuoguole lower uplift, Tarim Basin. They are Eoplacognathus suecicus, Pygodus anitae and Pygodus serrus in ascending order. These fossil provide the basis for the division and correlation of the Yijianfang Formation which is one of the main exploration targets. The characteristics of the Yijianfang Formation were analyzed based on isotopic strati-graphy, lithologic and petrophysical features and seismic data at the same time. On this basis, the distribution of the Yijianfang Formation in this district was analyzed through the comparison of the stratigraphic division, precise tracking and interpretation of seismic horizons. This formation is widely distributed in the Shuntuoguole lower uplift, with a thickness of 140-220 m. It has the largest thickness (> 200 m) in the SN1 to ST1 well area. There is no erosion unconformity between the Yijianfang Formation and the Qiaerbake Formation, which did not allow the development of paleo karst in the Middle Caledonian.

国家科技重大专项“塔里木盆地重点地区海相碳酸盐岩层系油气富集规律与目标评价”（2017ZX05005002-001）和中国石化科研项目“塔里木寒武系—中下奥陶统储层发育模式研究”（P16112）资助。

https://doi.org/10.11781/sysydz201803353