【作者】 钱一雄； 李国蓉； 刘光祥；

【Author】 QIAN yixiong, LI guorong, LIU guangxiang(1. Research Institute Of Experimental Geology .SINOPECPC, Box916,wuxi,Jiangsu, 214151,China) (2. Petroleum Department, Chengdu University of Technology, Chengdu, Sichuan, China)

【机构】 中国石化勘探开发研究院无锡实验地质研究所； 成都理工学院石油系；

【摘要】 通过对塔河中上奥陶统部分沉积剖面较详细的岩芯观察以及元素地球化学分析后认为,自下而上,以暗色瘤状泥质灰岩、纹层状灰岩、瘤状灰岩、碎屑灰岩为沉积组合,代表了一套向上变浅的深海沉积;深海沉积的主要标志是紫红色瘤状灰岩,其中的Al、Si、Fe、Mn及Sr、V、Vi、Cr含量相对较高;而在对泥质岩的常量与微量元素综合基础上,进一步提出与证实了石炭系卡拉沙依组的属于半咸水-咸水的湖相的沉积环境;而对原划入为石炭系的灰岩的稀土元素分布特征以及沉积组合分析后认为:S60井中的石炭系巴楚组与奥陶系地层界线可能应向上移。更多还原

【Abstract】 The stratigraphic section of the Middle and Upper Ordovician system in well S60 of Tahe oilfield is recorded as follows, :from bottom to upper, the lithology of deposition includes respectively: the dark or purple nodular pelite-bearing limestone, regularly laminated limestone, nodular limestone and calcarenite with crinoid columnals and brachiopods, the above suite of carbonate stratigraphy has been analyzed largely through a combination of the detailed field observations and geochemical composition analysis .especially analysis of the trace elements of carbonates. Herein we demonstrate that it belongs to a deep marine carbonate accumulation with the depositional environment from the deep to shallow marine and a significant high contents of Al,Si,Fe,Mn, Sr, V, Ni, Cr for the purple nodular limestone. In addition, the author, based on the studies of geochemical compositions and trace elements of pelites, attempt to draw the conclusion that the deposition of environment of the Kalashayi formation is of characteristic of lake deposit in either brine or between fresh and brine or brine water,, although the more evidence is needed. Moreover, the distribution of rare earth elements for the limestone samples along with the stratigraphic patterns in the strata section, which had been commonly interpreted as the Carboniferous, indicated that it might be directly associated with the products of different depositional environment, therefore, the stratigraphic classification for the Carboniferous and Ordovician in Well S60 may be renewed and most likely to rise upward.更多还原