Investigation of the wide-range maturity indices for sedimentary organic matter

沉积物有机质宽范围成熟度指数研究

基本信息

批准号：
10640439
负责人：
SAMPEI Yoshikazu
金额：
$ 2.43万
依托单位：
SHIMANE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

1.Characterization of Methylphenanthrene with Methyldibenzothiophen as wide-range maturity indicator in mudrocks, Japan :Methylphenanthrene index (PFI), a wide-range maturation indicater, was characterized with methyldebenzothiophen for the Cretaceous-tertialy mudstones in Japan. Mudstones from Miocene Nanatani-Teradomari Formation (MITI Tomikura and Tojo) in Niigata Prefecture, Onnagawa Formation in Akita prefecture, Josoji Formation in Shimane Prefecture and Cretaceous-Tertiary Shimanto Group in Kochi Prefecture were investigated to know the variation of MPI and its relation to %Ro. For all rock samples, the MPI showed increase from 0.7 to 4.2 in the mature zone (%Ro=0.5-1.9) and decrease from 4.2 to 1.3 in the over-mature zone (%Ro=1.9-4.5). The upper slope in these trends was discussed by means of geochemical kinetics, suggesting that the MPI change depend on production of intermediate MPI and the methyl-shift from α-isomer to β-isomer.2.Geochemical kinetic parameters for isomeriza … More tion of Methylphenanthrene :To know the variation of MPI in the oil window, the geochemical dynamics of MPI change were examined by the heating experiment of Sarukawa crude oil from Onnagawa Formation with clay mineral (bentonite) and water in the heat/pressure-stable reactor at 300, 350, 370, 380, 400 and 450℃. The activation energy (E) and frequency factor (A) of the MPI change within the upper slope were obtained by the heating experiment as follows : E = 57.2 kcal/mol and A = 2.23 x 10^<12> s^<-1>. Based on the results, the relationship between MPI and maximum paleo-temperature was estimated for some basin.3.Contact metamorphism of Miocene Josoji black mudstones in Shimane Peninsula, southwest Japan :Compositional changes in organic matter by contact metamorphism were investigated for Miocene Josoji black mudstones in Shimane Peninsula. Three representative outcrops were selected, where the black mudstones have invaded by ryorite and andesite lava. Several rock samples were collected from the contact plane to about 30m distance. The ryorite supposed to have thermally influenced the mudstones more than the andesite. This is due to size of the intrusion. The ryorite decomposed organic matter to be less than 10%, but the andesite to be only about 70%.4.Compositional changes in organic matter artificially heated black mudstone from Miocene Josoji formation, southwest Japan :This study is a preliminary experimental work on decomposition of organic matter in sedimentary rocks. Compositional changes in the organic matter after heating blask mudstone from Miocene Josoji formation, Shimane peninsula were investigated. The mud rocks were heated in an oven at constant temperature. i. e. 200, 250, 300, 350, 400, 450, 500, 550 and 600℃, for 2 days. After the experiment of 60O℃, TOC (total organic carbon), TN (total nitrogen) and TS (total sulfur) decreased to 50%, 25% and 20% of the initial rocks, respectively. Pristane/Phytane ratio and CPI (carbon preference index) decreased from 4.3 to 0.3 and from 1.1 to 0.25, respectively. HI (hydrogen index) abnormally decreased from 43 to 1. Less

1。用甲基苯二苯甲酸甲苯克的甲基苯酚作为日本Mudrocks中的宽范围成熟指标的表征：甲基苯克烯指数（PFI）是一种宽范围的成熟指标，其特征在日本的甲基苯二甲酸甲甲基甲基甲基甲基苯甲酸甲酯中的特征。 Mudstones from Miocene Nanatani-Teradomari Formation (MITI Tomikura and Tojo) in Niigata Prefecture, Onnagawa Formation in Akita Prefecture, Josoji Formation in Shimane Prefecture and Cretaceous-Tertiary Shimanto Group in Kochi Prefecture were investigated to know the variation of MPI and its relation to %Ro.对于所有岩石样品，在成熟区域（％ro = 0.5-1.9）中，MPI从0.7增加到4.2，在过度成熟区域（％RO = 1.9-4.5）中均从4.2降低到1.3。 The upper slope in these trends was discussed by means of geochemical kinetics, suggesting That the MPI change depend on production of intermediate MPI and the methyl-shift from α-isomer to β-isomer.2.Geochemical kinetic parameters for isomeriza … More tion of Methylphenanthrene :To know the variation of MPI in the oil window, the geochemical dynamics of MPI change通过从Onnagawa形成的Sarukawa原油的加热实验，粘土矿物（膨润土）和300、370、370、380、400和450℃的热/压力稳定反应堆中的加热实验。上坡内MPI变化的激活能（E）和频率因子（A）是通过加热实验获得的，如下所示：E = 57.2 kcal/mol和A = 2.23 x 10^<12> s^<-1>。根据结果，估计了一些盆地的MPI与最大古 - 温度之间的关系。3。日本西南部Shimane Peninsula中新世Josoji Josoji黑色泥石的变质：通过与Miecoen Josoji Josoji Josoji Blacksonane shimane peninsula的Miorphorm接触变质。选择了三个代表性的露头，其中黑色泥石被ryorite和现场熔岩入侵。从接触平面到约30m距离收集了几个岩石样品。预计利奥特石比和站点对泥岩的影响更大。这是由于入侵的大小。利奥尔特人分解的有机物少于10％，但在日本西南部的中新世Josoji形成人工加热的有机物质的有机物的物质变化约为70％。研究了Josoji组，Shimane半岛。将泥岩在恒温下在烤箱中加热。即200、250、300、350、400、450、500、550和600℃，持续2天。实验后，TOC（总有机碳），TN（总氮）和TS（总硫）分别降至初始岩石的50％，25％和20％。 Pristane/Phytane比率和CPI（碳偏好指数）分别从4.3降至0.3，并从1.1下降到0.25。 HI（氢指数）从43显着降低到1。