Hydrocarbon Generation Potential and Organic Matter Enrichment Mechanism of the Cambrian Marine Shale in the Tadong Low Uplift,Tarim Basin  

作　　者：MIAO Huan WANG Yanbin JIANG Zhenxue ZHAO Shihu SHANG Peng GONG Xun TAO Chuanqi ZHANG Yu 

机构地区：[1]State Key Laboratory of petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China [2]Unconventional Unconventional Petroleum Research Institute Research Institute,China University of Petroleum,Beijing 102249,China [3]College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China [4]Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China [5]Second Gas Production Plant,PetroChina Changqing Oilfield Company,Yulin,Shaanxi 719000,China [6]School of Earth and Space Sciences,Peking University,Beijing 100871,China [7]School of Civil Engineering,Liaoning Petrochemical University,Fushun,Liaoning 113001,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第5期1301-1321,共21页地质学报（英文版）

基　　金：supported by the National Major Science and Technology Project of China(Grant Nos.2016ZX05066001-002;2017ZX05064-003-001;2017ZX05035-02 and 2016ZX05034-001-05);the Innovative Research Group Project of the National Natural Science Foundation of China(Grant Nos.41872135;42072151 and 42372144);the Project of Education Department of Liaoning Province(Grant No.LJKMZ20220744)。

摘　　要：Cambrian shales in China and elsewhere contain abundant oil and gas resources.However,due to its deep burial and limited outcrop,there has been relatively little research conducted on it.The Cambrian shale of the Tadong low uplift in the Tarim Basin of western China,specifically the Xidashan-Xishanbulake Formation(Fm.)and overlying Moheershan Fm.provide a case study through the use of organic petrology,mineralogy,organic and elemental geochemistry,with the aim of analyzing and exploring the hydrocarbon generation potential(PG)and organic matter(OM)enrichment mechanisms within these shale formations.The results indicate that:(1)the Cambrian shale of the Tadong low uplift exhibits relatively dispersed OM that consists of vitrinite-like macerals and solid bitumen.These formations have a higher content of quartz and are primarily composed of silica-based lithology;(2)shale samples from the Xidashan-Xishanbulake and Moheershan formations demonstrate high total organic carbon(TOC)and low pyrolytic hydrocarbon content(S_(2))content.The OM is predominantly typeⅠand typeⅡkerogens,indicating a high level of maturation in the wet gas period.These shales have undergone extensive hydrocarbon generation,showing characteristics of relatively poor PG;(3)the sedimentary environments of the Xidashan-Xishanbulake and Moheershan formations in the Tadong low uplift are similar.They were deposited in warm and humid climatic conditions,in oxygen-deficient environments,with stable terrigenous inputs,high paleoproductivity,high paleosalinity,weak water-holding capacity,and no significant hydrothermal activity;and(4)the relationship between TOC and the paleoproductivity parameter(P/Ti)is most significant in the Lower Cambrian Xidashan-Xishanbulake Fm.,whereas correlation with other indicators is not evident.This suggests a productivity-driven OM enrichment model,where input of landderived material was relatively small during the Middle Cambrian,and the ancient water exhibited lower salinity.A comprehensive pattern was formed under the

关 键 词：Conventional resources hydrocarbon generation potential geochemistry sedimentary environment enrichment mechanism organic matter CAMBRIAN Tadong low uplift 

分 类 号：P618.13[天文地球—矿床学]