西南石油大学学报（自然科学版）2025，Vol.47Issue(1)：163-180,18.DOI:10.11885/j.issn.1674-5086.2024.09.12.02
琼东南盆地早渐新世—早中新世气候、植被演变及其对海相烃源岩发育的影响
Palaeoclimatic and Palaeofloral Evolution and Their Influences on Organic Matter Enrichment of the Early Oligocene-Early Miocene Marine Shales in the Qiongdongnan Basin
摘要
Abstract
Natural gases in the northern South China Sea are predominantly derived from the Late Oligocene-Early Miocene marine shales.The organic matter enrichment and its controlling factors are key points for the natural gas exploration in the Qiongdongnan Basin.The organic matter enrichment from the Oligocene to the Early Miocene marine shales from fifteen wells in the Qiongdongnan Basin was found using the data of total organic carbon measurement and Rock-Eval pyrolysis.During the early Oligocene,the Middle Yacheng Formation shales are enriched in terrigenous organic matter,which was thought to be caused by the flourished tropical/subtropical plants in the more humid environment.During the Late Oligocene-Early Miocene,there is also a terrigenous organic matter enrichment.Analyses of plant-derived biomarkers,palynogical records in shales in combination with regional global climate variations suggest the terrigenous organic matter enrichment was in association with warming and humid climate in the Late Oligocene-Early Miocene,during which higher plants flourished and the East Asian summer monsoon coupled with annual precipitation intensified.The significant extra precipitation brought by intensified East Asian summer monsoon was beneficial for the large amount of scattered plant organic matter enrichment and hence the terrigenously-enriched marine shales were more widely deposited in shallow marine environment.The finding of terrigenous organic matter enrichment in the Late Oligocene-Early Miocene marine source rocks was beneficial for the deep-water natural gas exploration in the deeply buried Ledong Sag and the Lingshui Sag in the Qiongdongnan Basin.关键词
古植被/古气候/陆源海相烃源岩/有机质富集/深水天然气勘探Key words
palaeovegetation/palaeoclimate/terrigenously-dominated marine shales/organic matter enrichment/deep-water gas exploration分类
能源科技引用本文复制引用
丁文静,李友川,兰蕾,杨树春,刘海钰..琼东南盆地早渐新世—早中新世气候、植被演变及其对海相烃源岩发育的影响[J].西南石油大学学报（自然科学版）,2025,47(1):163-180,18.基金项目
国家自然科学基金青年科学基金(42202184) （42202184）
