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Types, Petrophysical Properties and Pore Evolution of Late Ediacaran Microbial Carbonates, Tarim Basin, NW China
投稿时间:2022-02-12  修订日期:2022-05-22  点此下载全文
引用本文:TANG Pan,CHEN Daizhao,QIAN Yixiong,WANG Yuanzheng,YANG Bo.2022.Types, Petrophysical Properties and Pore Evolution of Late Ediacaran Microbial Carbonates, Tarim Basin, NW China[J].ACTA GEOLOGICA SINICA(English edition),96(4):1362~1375
摘要点击次数: 115
全文下载次数: 105
DOI:10.1111/1755-6724.14974
作者单位E-mail
TANG Pan 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
CHEN Daizhao 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China dzh-chen@mail.iggcas.ac.cn 
QIAN Yixiong 4 Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China  
WANG Yuanzheng 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
YANG Bo 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
 
Author NameAffiliationE-mail
TANG Pan 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
CHEN Daizhao 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China dzh-chen@mail.iggcas.ac.cn 
QIAN Yixiong 4 Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China  
WANG Yuanzheng 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
YANG Bo 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China 3 University of Chinese Academy of Sciences, Beijing 100049, China  
Abstract:The Upper Ediacaran microbial carbonates of the Tarim Basin are potential reservoir geobodies for future hydrocarbon exploration with rising interest in exploration for deeply-buried reserves. However, little knowledge has been acquired on the types of microbial carbonates that are present, the properties of the reservoir and the pore evolution, hampering predictions of high-quality reservoirs in these carbonates. Integrated with petrography and in-situ U-Pb dating geochronology analyses, this study aims to clarify the types of microbial carbonates present and to reconstruct the pore evolution processes of the potential reservoir rocks. The Upper Ediacaran microbial carbonates of the Tarim Basin can be divided into four types, based on their features in terms of different scales (macro- to micro-): microbial laminite, stromatolite, spongiomicrobialite and microbial-peloidal wackestone/mudstone. Petrophysical properties show that all these microbial carbonates have low porosity and very low permeability with poor connectivity. These carbonates were subject to long-term and complex diagenetic processes, mainly consisting of dissolution, compaction, pervasive dolomitization, cementation and fracturing. The most important reservoir spaces are contributed by vugs and dissolution-enlarged pores, which are likely to have been associated with the widespread uplift of the Aksu area in the terminal Ediacaran. In contrast, the cementation of the fine-to-medium crystalline dolomite greatly reduced the pre-existing pores. Pore types are closely related to different microbial fabrics, which played an important role in the pore evolution of the microbial carbonates.
keywords:microbial carbonate, Late Ediacaran, reservoir property, pore evolution, Tarim Basin
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