Study on the system of deposition of organic matter in fore-arc basin and accretionary prism during Paleogene and Neogene

古近纪和新近纪弧前盆地和增生棱柱有机质沉积体系研究

基本信息

批准号：
16340155
负责人：
SAMPEI Yoshikazu
金额：
$ 10.69万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16340155/
关键词：
fore-arc basin accretionary prism system of deposition of organic matter Sagara oil field oil system bacteria thermal history OAE (oceanic anoxic event)メタンハイドレート炭酸塩ノジュール白亜系 Oleanane 被子植物古〜新第三系増温率

项目摘要

'2004-2006'In order to make clear the system of deposition of organic matter in fore-arc basin and accretionary prism, we investigated mud-rocks, oils, bacteria and micro-fossiles from Kakegawa area of Sizuoka prefecture, MITI "Sagara" (cuttings) and Shimant zone of Muroto Peninsula. Results are followings : 1. The oils from the northwest Megami anticline contained highly matured aromatic hydrocarbon and lowly matured steranes and hopanes. The oils from the southeast of the anticline steranes and hopanes were highly matured. These results suggest that the oil could be contaminated by another oil with different maturity. 2. Siliceous mudstones for the lower Miocene Matsuba Formation of Mikura Group showed a good potential source rock (TOC=0.9%, S2=c.a.2.8mgHC/gRock, HI=c.a.350mgHC/gC) in the Kakegawa area, but did not show a good potential in MITI "Sagara" from off shore area. 3. Heating rate during Paleogene and Neogene was high in the Kakegawa area and low in the off shore MITI "Sagar … More a" area. Only Paleogene Mikura Group reached to the deep zone which generated condensates. 4. Based on the computer simulation of basin modeling (Basin-Mod), the fore-arc basin in the Sagara oil field generated oils in 29Ma (the Mikura Group) and 15Ma (the Kurami Group), and then generated condensates in 2 Ma (the Mikura Group). 5. The condensate from the Mikura Group could migrated from source bed to the Megami trap with contamicating oils from the Kurami Group during migration. 6. Fossils of calcareous nannoplankton were Sphenolithus heteromorphus, Hericosphaera ampliaperta and the other 11 species suggested that the age of the middle-lower Saigo Group was CN3 zone (18.2-15.6 Ma). 7. Bacteria HD-1 was not found in the Sagara oils suggesting that HD-1 could not generate the main part of the Sagara oils. Toluene-bacteria was found. 8. In the accretionary prism from the Muroto Peninsula showed that organic rich sediments were deposited in Cretaceous ocean in this area, but the sediments contain a lot of terrestrial organic matter. Less

'2004-2006'为了弄清弧前盆地和增生棱柱有机质的沉积系统，我们对静冈县挂川地区的泥岩、石油、细菌和微化石进行了调查，通产省" Sagara”（岩屑）和室户半岛的 Shimant 地带。结果如下： 1. 来自西北 Megami 背斜的石油含有高度成熟的石油芳香烃和低成熟度甾烷和藿烷。背斜东南部的甾烷和藿烷是高度成熟的。这些结果表明，该石油可能受到另一种不同成熟度的石油的污染。 2. 下中新统松叶组硅质泥岩。 Mikura Group显示出良好的潜在烃源岩（TOC=0.9%，S2=c.a.2.8mgHC/gRock， 3. 挂川地区的古近纪和新近纪升温速率较高，而近海 MITI“Sagar … More a”区域的升温速率较低，只有古近纪 Mikura 群到达了产生凝析油的深部区域。 4. 基于计算机模拟。盆地建模相良油田弧前盆地（Basin-Mod）在29Ma（Mikura群）和15Ma（Kurami群）生成石油，然后在2Ma（Mikura群）生成凝析油5.凝析油。来自 Mikura 群的油可能会在迁移过程中与来自 Kurami 群的污染油一起从源层迁移到 Megami 圈闭。 6. 化石。钙质微浮游生物为Sphenithus heteromorphus、Hericosphaera ampliaperta等11种，推测西乡群中下层的年龄为CN3带（18.2~15.6 Ma）。7.相良油中未发现细菌HD-1，推测HD。 -1 不能生成相良油的主要部分——发现了甲苯细菌。室户半岛的增生棱镜表明，该地区白垩纪海洋沉积了富含有机物的沉积物，但沉积物中陆地有机质含量较多。