Geochemical and Geological Characterization of Marine-Continental Transitional Shale: A Case Study in the Ordos Basin, NW China

作     者：WEI Zhifu WANG Gen WANG Yongli MA Xueyun ZHANG Ting HE Wei YU Xiaoli WEI Zhifu;WANG Gen;WANG Yongli;MA Xueyun;ZHANG Ting;HE Wei;YU Xiaoli

作者机构：Key Laboratory of Petroleum Resources ResearchGansu ProvinceNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Cenozoic Geology and EnvironmentInstitute of Geology and GeophysicsChinese Academy of SciencesCAS Center for Excellence in Life and PaleoenvironmentBeijing 100029China University of Chinese Academy of SciencesBeijing 100049China 

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

年 卷 期：2020年第94卷第3期

页      面：809-821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] 

基　　金：This work was financially supported by the Chinese Academy of Sciences Key Project(Grant No.XDB10030404) the National key R&D Program of China(Grant No.2017YFA0604803) the National Natural Science Foundation of China(Grant Nos.41831176,41572350 and 41503049) the Key Laboratory Project of Gansu(Grant No.1309RTSA041) 

主　　题：marine-continental transitional shales desorbed gas pore structure FE-SEM Ordos Basin 

摘      要：The organic-rich shale of the Shanxi and Taiyuan Formation of the Lower Permian deposited in a marinecontinental transitional environment are well developed in the Ordos Basin,NW China,which is considered to contain a large amount of shale hydrocarbon *** study takes the Lower Permian Shanxi and Taiyuan shale collected from well SL~# in the Ordos Basin,NW China as an example to characterize the transitional shale *** on organic geochemistry data,X-ray diffraction(XRD)analysis,field-emission scanning electron microscopy(FE-SEM)observations,the desorbed gas contents of this transitional shale were systematically studied and the shale gas potential was *** results indicate that the Lower Permian Shanxi and Taiyuan shale has a relatively high total organic carbon(TOC)(average TOC of 4.9%)and contains type III kerogen with a high mature to over mature *** analyses show that an important characteristic of the shale is that clay and brittle minerals of detrital origin comprise the major mineral composition of the marine-continental transitional shale samples,while the percentages of carbonate minerals,pyrite and siderite are relatively ***-SEM observations reveal that the mineral matrix pores are the most abundant in the Lower Permian shale samples,while organic matter(OM)pores are rarely *** analysis suggests that the mineral compositions mainly govern the macropore development in the marine-continental transitional shale,and mineral matrix pores and microfractures are considered to provide space for gas storage and *** addition,the desorption experiments demonstrated that the marine-continental transitional shale in the Ordos Basin has a significantly potential for shale gas exploration,ranging from 0.53 to 2.86 m^3/t with an average value of 1.25m^3/t,which is in close proximity to those of terrestrial shale(1.29 m^3/t)and marine shale(1.28 m^3/t).In summary,these results demonstrated that the L