华南地震2024，Vol.44Issue(1)：11-24,14.DOI:10.13512/j.hndz.2024.01.02
古近系文昌组湖盆古环境及其对烃源岩的控制作用
Lake Basin Paleoenvironment of Paleogene Wenchang Formation and Its Control Effect on Hydrocarbon Source Rocks—Taking Lufeng 15 Depression in the Pearl River Mouth Basin as an Example
摘要
Abstract
The lacustrine mudstone of Wenchang Formation is the main source rock section of Lufeng 15 depression in the Pearl River Mouth Basin.In order to restore the paleoenvironment of Wenchang Lake Basin and further explore the development model of high-quality hydrocarbon source rocks,a comprehensive analysis of paleontology,organic geochemistry,organic petrology and element geochemistry characteristics of Wenchang Formation mudstone in well L15-1 in the depression was carried out.The research results indicate that there are significant differences in the paleoenvironment of each layer of the Wenchang Formation,with relatively shallow water bodies during the sedimentary periods of the Wen-1 to Wen-3 and Wen-5 sections,mainly the shore-shallow lake environment with oxygenated distant sources,and average levels of paleoproductivity;during the sedimentary period of Wen-4 section,the water body was relatively deep,with a semi-deep lake to deep lake environment and the highest level of paleoproductivity.The quality of hydrocarbon source rocks in the Wenchang period paleo-basin of Lufeng 15 depression is positively correlated with paleowater depth,paleoproductivity,and paleo-xygenation facies under the condition of freshwater and brackish water medium.The difference in paleoclimate during the sedimentation period of Wenchang Formation is not significant,and a warm and humid climate is favorable for the development of high-quality hydrocarbon source rocks.Paleoproductivity and paleo-xygenation facies are the main controlling factors for the enrichment of organic matter in Wenchang Formation of Lufeng 15 Depression.In fact,paleoproductivity and preservation condition are well matched,which jointly control the development of effective source rocks.关键词
古氧相/古生产力/优质烃源岩/文昌组/陆丰15洼Key words
Paleo-xygenation facies/Paleoproductivity/High-quality source rock/Wenchang formation/Lufeng 15 Depression分类
天文与地球科学引用本文复制引用
郑仰帝,彭光荣,肖张波,黄鑫,何雁兵,杨兴业..古近系文昌组湖盆古环境及其对烃源岩的控制作用[J].华南地震,2024,44(1):11-24,14.基金项目
中海油科研项目"陆丰13洼陡坡带构造—沉积响应及油气成藏规律研究"(SCKY-2023-SZ-06) （SCKY-2023-SZ-06）
