LA-ICP-MS U-Pb Age, Clumped and Stable Isotope Constraints on the Origin of Middle Permian Coarse-Crystalline Dolomite Reservoirs in Northwest Sichuan Basin, Southwest China  

作　　者：PAN Liyin SHEN Anjiang HU Anping HAO Yi ZHAO Jianxin 

机构地区：[1]Key Laboratory of Carbonate Reservoirs,China National Petroleum Corporation,Hangzhou,Zhejiang 310023,China [2]PetroChina Hangzhou Research Institute of Geology,Hangzhou,Zhejiang 310023,China [3]Department of Geology,University of Kansas,Lawrence,KS 66045,USA [4]Radiogenic Isotope Facility,School of Earth Sciences,the University of Queensland,Brisbane 4072,QLD,Australia

出　　处：《Acta Geologica Sinica(English Edition)》2020年第4期1312-1313,共2页地质学报（英文版）

基　　金：jointly funded by the China National Science and Technology Major Project(granted No.2016ZX05004-002 and 2018A-0103);PetroChina Science and Technology Project(granted No.2018D-5006-35)。

摘　　要：Objective The recent discovery of commercial natural gas accumulations in the Middle Permian coarse-crystalline dolomites in the northwest Sichuan Basin has attracted attention to the formation mechanism of these deep-burial carbonate reservoirs.Due to their temporal relationship to the flooded basalts that represent the end-Middle-Permian Emeishan Large Igneous Province(ELIP),the Middle Permian dolomites were prev iously thought to be products of hydrothermal dolomitization related to the ELIP magmatism.Field and core observations,however,show that the occurrence and distribution of these dolomites are not controlled by faults,the supposed conduits for hydrothermal fluids.Conversely,they are somewhat strata-bound.Hence,the objective of this study,by employing LA-ICP-MS U-Pb dating,clumped isotope thermometry(047)and routine stable isotope geochemistry(C carbon,O oxygen and Sr strontium isotopes),is to re-evaluate the genesis of these dolomite reservoirs,with special attention focusing on the diagenetic environment and timing of dolomitization,and the attributes of dolomitizing fluids.

关 键 词：PERMIAN Middle reservoirs 

分 类 号：P618.13[天文地球—矿床学]