碳酸盐团簇同位素在海相盆地热史研究中的进展  

Progress in the study of carbonate clumped isotope in the thermal history of marine basins

作　　者：邱楠生[1,2] 刘鑫[1,2] 熊昱杰 刘雨晨 徐秋晨 常青[1,2] QIU Nansheng;LIU Xin;XIONG Yujie;LIU Yuchen;XU Qiuchen;CHANG Qing(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《石油实验地质》2023年第5期891-903,共13页Petroleum Geology & Experiment

基　　金：国家自然科学基金项目(41830424,U19B6003)资助。

摘　　要：沉积盆地热史研究对于油气成藏分析至关重要,在油气勘探以及油气资源评价领域有着举足轻重的影响,而海相盆地碳酸盐岩层系由于缺乏有效古温标导致很难对其热史进行恢复。碳酸盐团簇同位素是能够指示碳酸盐岩形成温度的指标,它将温度信息记录在^(13)C—^(18)O配对的化学键中,并通过其丰度变化将温度信息反映出来,即碳酸盐团簇同位素的丰度(Δ_(47))与地层温度演化密切相关。从碳酸盐团簇同位素测温以及热史恢复的基本原理、方法出发,结合近年来其在国内外海相盆地热史恢复的研究实例,综述了碳酸盐团簇同位素古温标的应用情况,并探讨了其存在的问题和未来的发展方向。碳酸盐团簇同位素作为一种新兴的古温标,在碳酸盐岩地层热历史恢复中展现出了巨大的潜力。团簇同位素热史研究实例表明,美国箭峡Bird Spring组经历的最高古温度约为175℃,四川盆地二叠系茅口组最高埋藏温度在213~225℃,塔里木盆地奥陶系受二叠纪岩浆活动影响存在160℃以上的异常高温。团簇同位素由于受热演化模式不成熟,重结晶作用以及沉积埋藏温度变化的影响,使得其在热史恢复方面仍存在不足,并建议精确恢复碳酸盐岩地层热史的下一步发展方向是将碳酸盐团簇同位素和U-Pb定年以及其他古温标相联合。The study of thermal history of sedimentary basins is very important for oil-gas accumulation analysis and has decisive influence on oil and gas exploration and oil-gas resource evaluation.However,it is difficult to reconstruct the thermal history of carbonate strata in marine basins due to the lack of effective palaeo-thermometer.The carbonate cluster isotope is an index that can indicate the formation temperature of carbonate rock.It records temperature information in chemical bond through conjugated 13C-18O,and temperature information is revealed through changes in the abundance of conjugated 13C-18O,namely,the abundance of carbonate clumped isotope(Δ47)is closely related to the evolution of strata temperature.This paper reviews the application of carbonate clumped isotope palaeo-thermometer and discusses the existing problems and future development direction based on the basic principle and methods of carbonate clumped isotope thermometry and thermal history reconstruction,and combined with the case studies of thermal history reconstruction in marine basins in recent years.As a new palaeo-thermometer,carbonate clumped isotope shows great potential in the thermal history reconstruction of carbonate strata.Previous studies show that the maximum paleotemperature of the Bird Spring Formation in Arrow Canyon,Nevada,USA is about 175℃,and the maximum burial temperature of Permian Maokou Formation in the Sichuan Basin is 213-225℃.There is an abnormal high temperature of above 160℃in the Ordovician strata of the Tarim Basin due to the Permian magmatic activity.We believe that the carbonate clumped isotope is still insufficient in the reconstruction of thermal history due to the immaturity of thermal evolution models,the recrys-tallization,and the change of burial temperature.Thus,we suggest that combining the carbonate clumped isotope,U-Pb dating,and other palaeo-thermometers to accurately reconstruct the thermal history of carbonate strata will be the future development direction.

关 键 词：团簇同位素 碳酸盐岩 海相盆地 热历史 塔里木盆地 四川盆地 

分 类 号：TE135[石油与天然气工程—油气勘探]