新疆塔河油田S112-1井中—晚奥陶世碳同位素记录  

CARBON ISOTOPE CHEMOSTRATIGRAPHY OF THE MIDDLE-LATE ORDOVICIAN CARBONATES AT WELL S112-1,TAHE OILFIELD,XINJIANG

作　　者：贾星亮[1] 成俊峰[1] 谭广辉 马冬晨[1] 武涛[1] 

机构地区：[1]中国石油化工股份有限公司西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《地层学杂志》2016年第4期382-388,共7页Journal of Stratigraphy

摘　　要：在塔河油田S112-1井中奥陶世—晚奥陶世已建立的牙形石生物地层框架内,对该井的124件碳酸盐岩岩芯样品进行了碳同位素分析研究。发现本次所获得碳同位素值全部在正值区域,δ13 C最大值为+2.7‰,最小值为+0.2‰,平均值为+1.071‰。从一间房组至恰尔巴克组碳同位素表现出缓慢上升。在良里塔格组发现可进行全球对比的GICE正漂移事件,此发现丰富了塔里木盆地覆盖区的中奥陶世—晚奥陶世的碳同位素证据,进一步验证了GICE事件的全球性。在GICE正漂移事件之后,碳同位素值经过短暂的波动,稳定表现在+1‰附近振荡。该时期的碳同位素值的变化趋势与中晚奥陶世海平面变化具有相关性。In this paper we report δ13C values of 124 carbonate drill-core samples from Well S112-1, and in- tegrate the chemostratigraphic results with the established conodont biostratigraphic sequence of Middle to Late Ordovician. All carbon isotope values are positive, with a maximum of ＋2. 7%0, a minimum of ＋0.2%0, and an average of ＋1. 071%0. The δ13C profile shows a slow increase from the Yijianfang Forma- tion to the Qiaerbake Formation. The globally recognized GICE positive excursion is identified in the Lian- glitag Formation, which significantly enriches the early Katian carbon isotope record in the Tarim Basin. After GICE, the δ13C values fluctuate for a short time period, and then stabilize at about ＋1‰. The δ13C variations appear to be correlated with sea level fluctuations during the Middle and Late Ordovician.

关 键 词：化学地层 碳同位素 GICE事件 中奥陶世-晚奥陶世 塔河油田 塔里木盆地 新疆 

分 类 号：P534.42[天文地球—古生物学与地层学] P539.7[天文地球—地质学]