海洋地质与第四纪地质2026，Vol.46Issue(2)：41-51,11.DOI:10.16562/j.cnki.0256-1492.2025072901
东海西湖凹陷天台区三角洲-潮坪环境烃源岩有机质富集控制因素
Controlling factors of organic matter enrichment in source rocks in delta-tidal flat environment of Tiantai block,Xihu sag of the East China Sea Basin
摘要
Abstract
The source rocks of Pinghu Formation in Tiantai block of Xihu sag are developed in the marine-continental transitional facies environment,and the distribution of high-quality source rocks is unclear,which limits the exploration deployment.Based on the analysis of pyrolysis,biomarker compounds,and major and trace elements of source rock samples from wells and cores,the abundance and type of organic matter in source rocks were evaluated.Combined with the identification of organic matter source and sedimentary preservation environment,the controlling factors of organic matter enrichment in source rocks were analyzed,and the development model of source rocks was established.Result shows that:The source rocks of the Pinghu Formation are medium-good source rocks as a whole.The organic matter type is mainly type II2-III,and some coal seams are developed.The source rocks are mainly gas-generating and a small amount of oil-generating.The quality of source rocks becomes better from the slope zone to the near-sag zone.The source of organic matter in source rocks is dominated by terrestrial higher plants,followed by aquatic organisms.From the slope zone to the near-sag zone,the contribution of aquatic organisms gradually increases.The ancient sedimentary environment of the source rock of the Pinghu Formation was a humid-semi-arid climate,and the salinity of the water body was fresh water to brackish water.It was an oxidation-weak reduction environment with low primary productivity.The input degree of terrestrial higher plants was the main controlling factor of organic matter enrichment in marine-continental transitional source rocks,while the influence of other factors was not significant.The development model of source rock in Tiantai block was established,and near-sag area is the favorable exploration direction of Tiantai block at present.关键词
烃源岩/有机质/控制因素/发育模式/天台区/西湖凹陷Key words
source rocks/organic matter/controlling factors/development model/Tiantai block/Xihu sag分类
天文与地球科学引用本文复制引用
丁飞,覃军,李宁,刁慧,王皖丽,余箐,于仲坤,徐靖琦..东海西湖凹陷天台区三角洲-潮坪环境烃源岩有机质富集控制因素[J].海洋地质与第四纪地质,2026,46(2):41-51,11.基金项目
"十四五"全国油气资源评价"中海油矿业权区及周边空白区油气资源评价"(QGYQZYPJ2022-3) （QGYQZYPJ2022-3）
中国海洋石油有限公司重大科技专项"东海西湖凹陷大中型气田勘探方向及关键技术研究"(KJZX-2023-0101) （KJZX-2023-0101）
中国海洋石油有限公司课题"西湖凹陷天台斜坡带大中型油气田勘探突破方向" （）
