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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年，为了弄清弧前盆地和增生棱柱体的有机质沉积体系，我们对静冈县卡克川地区、MITI“Sagara”（岩屑）和室户半岛Shimant地区的泥岩、石油、细菌和微生物进行了研究。研究结果如下：1. Megami背斜西北部的原油主要含高成熟度芳烃和低成熟度甾烷、藿烷。背斜东南部的原油成熟度较高。这些结果表明，该油可能被另一种具有不同成熟度的油污染。2.在卡克川地区，下中新统三仓群松叶组的硅质泥岩显示出良好的潜在烃源岩（TOC= 0.9%，S2=c.a.2.8mgHC/gRock，HI=c.a.350mgHC/gC），但在MITI“Sagara”的近海海岸地区，硅质泥岩未显示出良好的潜力。3.早第三纪和晚第三纪的加热速率在卡克川地区较高，而在海岸MITI“萨加尔地区较低 ...更多信息 a”区域。只有古近系三仓群到达深部，生成凝析油。4.基于盆地模拟（Basin-Mod）的计算机模拟，相良油田弧前盆地在29 Ma（三仓群）和15 Ma（仓见群）生成原油，在2 Ma（三仓群）生成凝析油。5.三仓组的凝析油在运移过程中与仓见组的污染油一起从生油层运移到Megami圈闭。6.钙质微型浮游生物化石有Sphenolithus heteromorphus、Hericosphaera heteromorphus等11种，推测西乡群中下段的时代为CN 3带（18.2- 15.6Ma）。7.结果表明，在芝麻油中未发现细菌HD-1，表明HD-1不能产生芝麻油的主要成分。发现甲苯细菌。在室户半岛的增生棱柱体中发现，该区白垩纪海洋沉积物中富含有机质，但沉积物中含有大量的陆源有机质。少