Diagenesis of the Paleogene Sandstones in the DN2 Gas Field,Kuqa Foreland Basin and its Link to Tectonics

作     者：YU Guoding YUAN Jing LIU Keyu YANG Xianzhang DONG Daotao MA Pengjie HUANG Chiqiang YU Guoding;YUAN Jing;LIU Keyu;YANG Xianzhang;DONG Daotao;MA Pengjie;HUANG Chiqiang

作者机构：School of GeosciencesChina University of PetroleumQingdaoShandong 266580China Institute of Petroleum Exploration and DevelopmentTarim Oil FieldCNPCKorlaXinjiang 841000China Korla Branch of Geophysical Research InstituteBGP Inc.KorlaXinjiang 841000China 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2023年第97卷第5期

页      面：1538-1554页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 

基　　金：financially supported by the program of the National Natural Science Foundation of China(No.42072134) the Major Research Project on the Tethys Geodynamic System from the National Science Foundation of China(No.92055204) the Major Scientific and Technological Projects of the CNPC under Grant ZD2019-183-001。 

主　　题：diagenesis high salinity fluids meteoric waters tectonics Kuqa Foreland Basin Tianshan Mts 

摘      要：We investigated diagenesis of the sandstones from the DN2 Gas Field of the Kuqa Foreland Basin(KFB),in order to infer the timing of fluid migration and discuss the linkage between fluids and tectonics.The textures and chemical composition of authigenic minerals,fluid evidence from fluid inclusions and formation water measurements were all used to fulfill this aim.Eodiagenesis occurred with the participation of meteoric water and connate water.Mesodiagenesis is related to high salinity fluids,which were attributed as originating from the overlying Neogene Jidike Formation evaporite(principal minerals including halite,anhydrite,glauberite,carnallite and thenardite).The onset of high salinity fluid migration is inferred to occur during the late Miocene(12.4-9.2 Ma)through the use of homogenization temperatures measured in the present study and K-Ar dating of authigenetic illites from previous work.This period is consistent with the crucial phase(13-10 Ma)that witnessed the rapid uplift of the southern Tianshan Mts and the stage when calcite and anhydrite veins formed in the studied strata.We thus argue that diagenesis related to high salinity fluids occurred as a response to the Tianshan Mts rapid uplift and related tectonic processes.The flow of high salinity fluids was probably driven by a density gradient and channeled and focused by fractures formed contemporaneously.