Constraining the genetic relationships of 25-norhopanes,hopanoic and 25-norhopanoic acids in onshore Niger Delta oils using a temperature-dependent material balance |
| |
| Institution: | 1. Exploration Section of Research and Development Division of Nigerian National Petroleum Corporation, 4-9 Moscow Road, Port Harcourt, Nigeria;2. Geofluids Research Group, Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, Aberdeen AB24 3UE, UK;1. Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8567, Japan;2. Technology and Research Center, Japan Oil, Gas and Metals National Corporation (JOGMEC), 1-2-2 Hamada, Mihama-ku, Chiba 261-0025, Japan;1. Institute for Applied Photophysics, TU Dresden, George-Bähr-Straße 1, Dresden D-01062, Germany;2. Physical Chemistry, TU Dresden, Bergstraße 66b, Dresden D-01062, Germany;1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh., 31, Moscow 115409, Russia;2. Institute of Solid State Physics RAS, 142432 Chernogolovka, Russia;3. Lomonosov State University of Fine Chemical Technologies, 119571 Moscow, Russia;4. National Research Centre “Kurchatov Institute” |
| |
| Abstract: | Analysis of oil samples from the Niger Delta (Nigeria) revealed a range of structurally related hopanes, including 25-norhopanes, and hopanoic and 25-norhopanoic acids. 25-Norhopanes were detected in all medium and heavily biodegraded oils and were most abundant in the heavily degraded oils. Hopanoic acids (C30-C33) and 25-norhopanoic acids (C30-C31) were most abundant in moderately degraded oils and occurred in reduced concentration in heavily degraded oils but were absent from, or in trace concentration in, slightly degraded oils. Consideration of the structures suggests that 25-norhopanoic acids form via carboxylation of 25-norhopanes or demethylation of hopanoic acids. Mass balance for the onshore Niger Delta oils suggests that formation of 25-norhopanes operates independently of 25-norhopanoic acid formation and that 25-norhopanoic acids are likely transient intermediates for only a small proportion of the 25-norhopanes. |
| |
| Keywords: | Biodegradation Crude oil Hopanes 25-Norhopanes Hopanoic acids 25-Norhopanoic acids Mass balance Niger Delta |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
