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The Lower Cambrian xiaoerbulake formation in the Tarim Basin as a potential carbonate source rock

Energy Geoscience 2024年第2期5卷 40-52页

作者： Miaoqing Miao Zhichao Sun Zongan Xue Miao Miao Kunpeng Jiang Xuefeng Zhang Zhongkai Bai Xiuxiang Lyu Xingui Zhou Yongjin Gao Miao Han Youxing Yang Oil and Gas Survey CGSBeijing100083China School of Earth and Space Sciences Peking UniversityBeijing100871China Institute of Energy Peking UniversityBeijing100871China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China School of GeoSciences China University of Petroleum(Beijing)Beijing102249China

The oil and gas exploration of the Middle and Lower Cambrian in the Tarim Basin reveals widely distributed source rocks with the Yuertusi formation being recognized as high-quality source rocks that are distributed in a rather small *** xiaoerbulake formation that is right under the Yuertusi formation has also been eyed as potential high-quality source rocks and is studied through analyses focusing on the stratigraphic development,the abundance,type,and maturity of organic matter,and the paleoproductivity of a dark-colored algae dolomite within the *** results show that the dolomite is rich in organic matter of mainly types Ⅰ and Ⅱ *** reached the high mature to over-mature stage,the dolomite was deposited in an anoxic sedimentary environment featuring a high paleoproductivity level and a high organic carbon burial efficiency,quite favorable for the development of high-quality source *** study provides material evidence to the Middle-Lower Cambrian subsalt source rock-reservoir-caprock combination model for the Tarim Basin.

关键词： Source rock Algal dolomite Yuertusi formation xiaoerbulake formation Tarim basin

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Genesis mechanism and Mg isotope difference between the Sinian and Cambrian dolomites in Tarim Basin

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Science China Earth Sciences 2023年第2期66卷 334-357页

作者： Guangyou ZHU Xi LI Tingting LI Lei ZHOU Yuxuan WU Bing SHEN Meng NING PetroChina Research Institute of Petroleum Exploration and Development Beijing100083China Institute of Energy China University of GeosciencesBeijing100083China School of Earth and Space Sciences Peking UniversityBeijing100871China

Dolomite genesis is a century-old mystery in *** reveal the mechanism of dolomite genesis,two core problems need to be *** first is the origin and migration mechanism of Mg^(2+)-rich fluids during the dolomitization *** second is the kinetic barrier caused by Mg^(2+)hydration during dolomite precipitation at low *** address these problems,our study,based on detailed petrological,sedimentological,geochemical(major and trace elements),and isotopic(C-O-Mg)analysis,clarified the source and migration of Mg^(2+)-rich fluids and the kinetic barrier mechanism of lowtemperature dolomite precipitation in the Upper Sinian Qigebulake formation and the Lower Cambrian xiaoerbulake formation in the Tarim ***,we found that the Mg^(2+)-rich fluids required for the dolomitization of dolomite in the xiaoerbulake formation were primarily derived from the Early Cambrian marine *** the interface of the sedimentary cycle,δ26Mg values fluctuated considerably,indicating that the sequence interface was the starting point and channel for the migration of dolomitized *** level variation plays a major role in controlling the dolomitization process of the xiaoerbulake ***,the Qigebulake formation contains low-temperature dolomite with Mg^(2+)-rich fluids supplied by seawater,microorganisms,and sedimentary organic *** analysis shows that the dolomite of the Qigebulake formation was formed by microbial induction by anaerobic methane ***,the properties and sources of dolomitization fluids and the formation process of dolomite were the reasons for the difference in the Mg isotope composition of dolomite during the Sinian-Cambrian *** study reveals the genetic mechanism of the Sinian-Cambrian dolomite in the Tarim Basin and establishes a new method to explain the genesis of microbial dolomite by C-O-Mg isotopes,providing a reference for the reconstruction of the formation and evolutio

关键词： Dolomite genesis Mg isotopes Carbon and Oxygen isotopes xiaoerbulake formation Qigebulake formation Tarim Basin

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