碳酸盐矿物定年和定温技术及其在川中古隆起油气成藏研究中的应用  

The dating and temperature measurement technologies for carbonate minerals and their application in hydrocarbon accumulation research in the paleo-uplift in central Sichuan Basin,SW China

作　　者：沈安江 赵文智[3] 胡安平 王慧 梁峰 王永生 SHEN Anjiang;ZHAO Wenzhi;HU Anping;WANG Hui;LIANG Feng;WANG Yongsheng(PetroChina Hangzhou Research Institute of Geology(HIPG),Hangzhou 310023,China;CNPC Key Laboratory of Carbonate Reservoirs,Hangzhou 310023,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油杭州地质研究院,杭州310023 [2]中国石油天然气集团有限公司碳酸盐岩储层重点实验室,杭州310023 [3]中国石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2021年第3期476-487,共12页Petroleum Exploration and Development

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05004-002);中国石油天然气股份有限公司直属院所基础研究和战略储备技术研究基金(2018D-5008-03);中国石油天然气股份有限公司科技项目“深层碳酸盐岩-膏盐岩组合沉积建模、成储机理研究与储层实验技术研究”(2019D-5009-16)。

摘　　要：基于含烃包裹体宿主矿物U-Pb同位素年龄和团簇同位素(D47)温度约束建立成藏地质过程重建新方法。通过激光原位U-Pb同位素年龄和团簇同位素温度约束油气成藏时间和深度,包括两个关键步骤:①显微镜下液态或气态烃类包裹体特征、丰度和分布研究;②烃类包裹体宿主矿物激光原位U-Pb同位素定年和团簇同位素定温。该方法应用于川中古隆起震旦系灯影组气藏成藏期次研究,通过含烃包裹体白云石宿主矿物U-Pb同位素年龄和团簇同位素(D47)温度的测定,识别出3个成藏期:①以距今(416±23)Ma为代表的志留纪末的石油聚集;②以距今(248±27)Ma和(246.3±1.5)Ma为代表的二叠纪末—早三叠世的石油聚集;③以距今(115±69)Ma和(41±10)Ma为代表的燕山—喜马拉雅期天然气聚集。川中古隆起灯影组气藏成藏史与工区构造-埋藏史、盆地热史、烃源岩生烃史高度吻合,展示了碳酸盐矿物定年和定温技术在油气成藏期次研究中的适用性和可靠性,具推广应用价值。A new method for reconstructing the geological history of hydrocarbon accumulation is developed,which are constrained by U-Pb isotope age and clumped isotope(△_(47))temperature of host minerals of hydrocarbon-bearing inclusions.For constraining the time and depth of hydrocarbon accumulation by the laser in-situ U-Pb isotope age and clumped isotope temperature,there are two key steps:(1)Investigating feature,abundance and distribution patterns of liquid and gaseous hydrocarbon inclusions with optical microscopes.(2)Dating laser in-situ U-Pb isotope age and measuring clumped isotope temperature of the host minerals of hydrocarbon inclusions.These technologies have been applied for studying the stages of hydrocarbon accumulation in the Sinian Dengying gas reservoir in the paleo-uplift of the central Sichuan Basin.By dating the U-Pb isotope age and measuring the temperature of clumped isotope(△_(47))of the host minerals of hydrocarbon inclusions in dolomite,three stages of hydrocarbon accumulation were identified:(1)Late Silurian:the first stage of oil accumulation at(416±23)Ma.(2)Late Permian to Early Triassic:the second stage of oil accumulation between(248±27)Ma and(246.3±1.5)Ma.(3)Yanshan to Himalayan period:gas accumulation between(115±69)Ma and(41±10)Ma.The reconstructed hydrocarbon accumulation history of the Dengying gas reservoir in the paleo-uplift of the central Sichuan Basin is highly consistent with the tectonic-burial history,basin thermal history and hydrocarbon generation history,indicating that the new method is a reliable way for reconstructing the hydrocarbon accumulation history.

关 键 词：激光原位U-Pb同位素测年 团簇同位素测温 烃类包裹体 碳酸盐矿物定年 碳酸盐矿物定温 宿主矿物 油气成藏 川中古隆起 震旦系灯影组 

分 类 号：TE122.1[石油与天然气工程—油气勘探]