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Types,Petrophysical Properties and Pore Evolution of late ediacaran Microbial Carbonates,Tarim Basin,NW China

Acta Geologica Sinica(English Edition) 2022年第4期96卷 1362-1375页

作者： TANG Pan CHEN Daizhao QIAN Yixiong WANG Yuanzheng YANG Bo Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Wuxi Research Institute of Petroleum Geology SINOPECWuxiJiangsu 214151China

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 ***,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 *** 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 *** 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/*** properties show that all these microbial carbonates have low porosity and very low permeability with poor *** carbonates were subject to long-term and complex diagenetic processes,mainly consisting of dissolution,compaction,pervasive dolomitization,cementation and *** 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 *** contrast,the cementation of the fine-to-medium crystalline dolomite greatly reduced the pre-existing *** types are closely related to different microbial fabrics,which played an important role in the pore evolution of the microbial carbonates.

关键词： microbial carbonate late ediacaran reservoir property pore evolution Tarim Basin

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A New Diverse Macrofossil Lagersttte from the Uppermost ediacaran of Southwestern China

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Acta Geologica Sinica(English Edition) 2008年第6期82卷 1095-1103页

作者： TANG Feng YIN Chongyu LIU Pengju GAO Linzhi ZHANG Wenyan Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 Key Laboratory of Stratigraphy and Paleontology Chinese Academy of Geological Sciences Beijing 100037 China Travel Service Head Office Beijing 100081

A new macrofossil Lagerstatte was discovered from the uppermost ediacaran Jiucheng Member at Jinning and Jiangchuan of the eastern Yunnan, yielding numerous diverse well-preserved thallophyte macrofossils. These include the previously-known representatives of vendobionts, Vendotaenia and Tyrasotaenia, and the biggish multicellular benthos such as Chuaria-like and Tawuia- like fossiis, as well as Longfengshaniaceaens with diverse holdfast structures. There are still some other problematic macrofossils with peculiar configurations as well as uncertain relatives. The distinct dominance of the giant, unbranching thallophytes occasionally with holdfast structures distinguishes this assemblage from the other ediacaran macrofossil Lagerstattes in the Doushantuo Formation at Miaohe, Wenghui and Lantian, and the contemporary assemblage in the Shibantan Member of Dengying Formation, Yangtze Gorges area. This paper outlines the characteristics of some of the multicellular macrofossils from the Jiucheng Member at Jiangchuan. They include some macrofossils with different types of holdfast structure, larger Chuaria-like and Tawuia-like morphology and questionable affinities as well. The discovery of greater diverse macrofossil assemblages from the Jiucheng Member of eastern Yunnan has further indicated that an important diversification and evolutionary radiation of metaphytes took place in the latest ediacaran time. This radiation of largescale, benthic metaphyte along with phytoplankton was likely important contributors to the early Cambrian explosion of metazoans.

关键词： eastern Yunnan late ediacaran Jiucheng Member diverse macrofossils

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