海洋地质与第四纪地质2024，Vol.44Issue(4)：134-144,11.DOI:10.16562/j.cnki.0256-1492.2023102302
东海陆架盆地椒江凹陷月桂峰组湖相烃源岩特征及发育主控因素
Characteristics and main controlling factors of lacustrine source rocks of Yueguifeng Formation in the Jiaojiang Sag,East China Sea Shelf Basin
摘要
Abstract
In the 1990s,oil and gas were discovered after drilling into the Jiaojiang Sag,East China Sea Shelf Basin,revealing the prospects for oil and gas exploration.However,since then,there has been little research on this sag,especially the lack of systematic research on the source rocks,which hinders the exploration process.To clarify the characteristics and development model of the source rocks of the Yueguifeng Formation in the Jiaojiang Sag and provide the basis for deploying further exploration wells,we summarized the tectonic and sedimentary background of the Yueguifeng Formation,and analyzed the characteristics of the source rock using geochemical data including organic petrology,biomarkers,and trace elements.Based on that,the controlling factors of the enrichment of organic matter in the Yueguifeng Formation were discussed from the aspects of paleo-productivity,preservation conditions,and sedimentation rate,and a model showing the formation of the source rock was established.Results show that the source rocks in the Yueguifeng Formation are dark gray lacustrine mudstone deposited in the continental half-graben,with kerogen type Ⅱ1-Ⅱ2,and the abundance of organic matter was rated good to very good in the industry standards.Source rocks deposited during the lake expansion are the thickest and have the widest distribution and the best quality.The development of high-quality source rocks requires abundant algal material,semi-closed stable water under slightly brackish conditions,and a moderate sedimentation rate.Source rocks are developed in both hanging wall and dip slope under the background of a graben shaped fault depression,but the types and abundance of the two are different.The depocenter developed good source rocks of middle-deep lacustrine facies,which was mainly contributed by algal organisms and formed in a relatively reduced environment.In contrast,the dip slope developed medium to shallow lacustrine facies,which was mainly contributed by terrestrial plants and formed in a relatively oxidized environment.关键词
湖相烃源岩/主控因素/椒江凹陷/月桂峰组Key words
lacustrine facies source rock/controlling factors/Jiaojiang Sag/Yueguifeng Formation分类
海洋科学引用本文复制引用
张彦振,覃军,王雷,常文琪,徐靖琦..东海陆架盆地椒江凹陷月桂峰组湖相烃源岩特征及发育主控因素[J].海洋地质与第四纪地质,2024,44(4):134-144,11.基金项目
中国海油"十四五"重大科技项目子课题"丽水-椒江凹陷早降晚抬背景下烃源岩与运汇单元研究"(KJGG2022-0301) （KJGG2022-0301）
