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

doi:10.11885/j.issn.1674-5086.2024.09.12.02

西南石油大学学报(自然科学版) ›› 2025, Vol. 47 ›› Issue (1): 163-180.DOI: 10.11885/j.issn.1674-5086.2024.09.12.02

• 深海油气勘探与开发地质专刊 • 上一篇

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

丁文静¹, 李友川¹, 兰蕾¹, 杨树春¹, 刘海钰²

1. 中海油研究总院有限责任公司, 北京朝阳 100028;
2. 中海油海南分公司研究院, 海南海口 570311

收稿日期:2024-09-12 发布日期:2025-03-12
通讯作者: 丁文静,E-mail:dingwj4@cnooc.com.cn
作者简介:丁文静，1989年生，男，汉族，湖北孝感人，高级工程师，主要从事油气地球化学及有机地球化学方面的研究工作。E-mail：dingwj4@cnooc.com.cn
李友川，1967年生，男，汉族，四川南部人，教授级高级工程师，主要从事油气地球化学方面的研究工作。E-mail：liych@cnooc.com.cn
兰蕾，1987年生，女，汉族，河南南阳人，高级工程师，主要从事油气地球化学等方面的研究工作。E-mail：lanlei@cnooc.com.cn
杨树春，1974年生，男，汉族，湖北荆州人，高级工程师，博士，主要从事盆地模拟及综合地质方面的研究工作。E-mail：yangshch@cnooc.com.cn
刘海钰，1989年生，女，汉族，湖北孝感人，高级工程师，主要从事油气地球化学方面的研究工作。E-mail：liuhy83@cnooc.com.cn
基金资助:
国家自然科学基金青年科学基金（42202184)

Palaeoclimatic and Palaeofloral Evolution and Their Influences on Organic Matter Enrichment of the Early Oligocene-Early Miocene Marine Shales in the Qiongdongnan Basin

DING Wenjing¹, LI Youchuang¹, LAN Lei¹, YANG Shuchun¹, LIU Haiyu²

1. CNOOC Research Institute Co. Ltd., Chaoyang, Beijing 100028, China;
2. Research Institute, CNOOC China Limited, Hainan Branch, Haikou, Hainan 570311, China

Received:2024-09-12 Published:2025-03-12

摘要/Abstract

摘要： 渐新统—中新统海相泥岩是南海北部天然气的重要来源，其有机质富集机制是琼东南盆地天然气勘探亟需解决的关键问题，为此，选取琼东南盆地15口井400余个海相泥岩样品，分析其热解、总有机碳及代表井的孢粉和分子地球化学数据耦合规律。结果表明，下渐新统崖城组二段是崖城组泥岩的有机质富集段；孢粉对比分析认为，其有机质富集受较湿热的气候中热带—亚热带植物大量勃发影响。陵水组二段上部—三亚组二段泥岩中也发现有机质逐渐富集的规律。生物标志化合物和孢粉记录结合区域气候对比结果表明，琼东南盆地上渐新统—下中新统海相泥岩有机质富集与逐渐温暖湿润的气候背景下，区域植被大量勃发，降水量的显著增加促进了河流—三角洲的发育，扩大了植物碎屑的搬运量、搬运距离和分布范围，促进了海相泥岩中的陆源有机质富集。琼东南盆地海相泥岩有机质富集段的提出对三亚组二段烃源岩埋深较大的乐东凹陷、陵水凹陷的深水天然气勘探具有重要意义。

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

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.

Key words: palaeovegetation, palaeoclimate, terrigenously-dominated marine shales, organic matter enrichment, deep-water gas exploration

中图分类号:

TE122

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.

DING Wenjing, LI Youchuang, LAN Lei, YANG Shuchun, LIU Haiyu. Palaeoclimatic and Palaeofloral Evolution and Their Influences on Organic Matter Enrichment of the Early Oligocene-Early Miocene Marine Shales in the Qiongdongnan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(1): 163-180.

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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

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