| 1. Identity statement | |
| Reference Type | Journal Article |
| Site | mtc-m12.sid.inpe.br |
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S |
| Identifier | 6qtX3pFwXQZ3r59YD6/GPAqP |
| Repository | sid.inpe.br/iris@1912/2005/07.21.00.37.43 (restricted access) |
| Last Update | 2007:04.12.12.01.50 (UTC) administrator |
| Metadata Repository | sid.inpe.br/iris@1912/2005/07.21.00.37.47 |
| Metadata Last Update | 2018:06.05.00.40.24 (UTC) administrator |
| Secondary Key | INPE-9040-PRE/4716 |
| ISSN | 0143-1161 |
| Label | 10212 |
| Citation Key | AlmeidaFo:2002:ReDeHy |
| Title | Remote detection of hydrocarbon microseepage-induced soil alteration  |
| Year | 2002 |
| Secondary Date | 20021031 |
| Month | Sep. |
| Access Date | 2024, Apr. 27 |
| Secondary Type | PRE PI |
| Number of Files | 1 |
| Size | 126 KiB |
| 2. Context | |
| Author | Almeida Filho, Raimundo |
| Resume Identifier | 8JMKD3MGP5W/3C9JJ4Q |
| Group | DSR-INPE-MCT-BR |
| Journal | International Journal of Remote Sensing |
| Volume | 23 |
| Number | 18 |
| Pages | 3523-3524 |
| History (UTC) | 2006-09-03 21:42:38 :: administrator -> jefferson :: 2007-04-12 12:01:50 :: jefferson -> administrator :: 2008-06-09 19:19:32 :: administrator -> banon :: 2008-11-05 15:15:58 :: banon -> jefferson :: 2010-07-07 19:06:00 :: jefferson -> marciana :: 2011-11-01 19:03:55 :: marciana -> administrator :: 2002 2018-06-05 00:40:24 :: administrator -> marciana :: 2002 |
| 3. Content and structure | |
| Is the master or a copy? | is the master |
| Content Stage | completed |
| Transferable | 1 |
| Content Type | External Contribution |
| Keywords | GEOLOGIA |
| Abstract | Cover Article no International Journal of Remote Sensing: Remote sensing techniques focused on the detection of the surface manifestation of hydrocarbon microseepage can be a complementary prospecting tool, minimising cost and time in the search for oil/gas deposits. The leakage of hydrocarbon and associated fluids to the surface is responsible for a number of chemical alterations in rocks and soils that overlay oil and gas reservoirs. Some of the microseepage-induced minerals exhibit diagnostic spectral features that allow their remote identification. The reducing environment created by the microseepage phenomenon can, for example, convert limonitic minerals to the ferrous state, resulting in bleaching of red beds. Owing to the fact that ferric-iron rich rocks exhibit a fall-off in reflectance from 0.8 *m towards shorter wavelengths, Landsat-5 Thematic Mapper ratio images of the bands 2 (0.52-0.60 *m)and 3 (0.63-0.69 *m)can be used to estimate the distribution of limonitic materials on the surface, which are indicated by low TM2/3 ratios. In contrast, ferric-iron depleted materials yield high TM2/3 ratios. However, vegetation cover also yields high TM 2/3 ratios, due to the high response in green and low in red wavelengths. The presence of healthy vegetation cover can be estimated by including a vegetation index, through the ratio of the TM4 (0.76-0.90 *m)and TM3 bands. Areas yielding high TM2/3 and low TM4/3 ratios may be assigned to ferric-iron poor materials, expressed as subtle grey shades in ratio images. Since the human eye is much more sensitive to colour hues than to grey tones, a false-colour composite consisting of TM2/3, TM4/3 and of the difference TM2/3-TM4/3, displayed as red, green and blue, respectively, can be used to express these subtle grey tones as colour variations. The cover photo is a band-ratio colour composite [TM2/3(R), TM4/3 (G), TM2/3-TM4/3 (B)], which covers a soil gas anomaly previously identified through a soil gas geochemical survey conducted by the Brazilian National Oil Co. (PETROBRAS), in the North Tucano Basin, north-eastern Brazil. Contour lines over the image indicate anomalous concentration (ppm)of soil gas (sum of ethane, propane, butane, and pentane). The use of a triangle of colours makes the interpretation of such a band-ratio colour composite very easy. Green and yellow hues, which result from high responses in both TM2/3 and TM4/3 ratios, express variations in the vegetation cover. On the other hand, hues of magenta, representing both high contribution of TM2/3 ratio and TM2/3-TM4/3 ratio difference are related to terrain conditions and represent altered areas induced by the microseepage phenomena (bleached materials), indicated by a arrow in the cover colour composite. |
| Area | SRE |
| Arrangement | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > DIDSR > Remote detection of... |
| doc Directory Content | access |
| source Directory Content | there are no files |
| agreement Directory Content | there are no files |
| 4. Conditions of access and use | |
| Target File | raimundo.pdf |
| User Group | administrator banon jefferson marciana |
| Visibility | shown |
| Copy Holder | SID/SCD |
| Archiving Policy | denypublisher denyfinaldraft12 |
| Read Permission | deny from all and allow from 150.163 |
| Update Permission | not transferred |
| 5. Allied materials | |
| Next Higher Units | 8JMKD3MGPCW/3ER446E |
| Dissemination | WEBSCI; PORTALCAPES; MGA; COMPENDEX. |
| Host Collection | sid.inpe.br/banon/2001/04.06.10.52 |
| 6. Notes | |
| Empty Fields | affiliation alternatejournal archivist callnumber copyright creatorhistory descriptionlevel doi e-mailaddress electronicmailaddress format isbn language lineage mark mirrorrepository nextedition notes orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup rightsholder schedulinginformation secondarymark session shorttitle sponsor subject tertiarymark tertiarytype typeofwork url versiontype |
| 7. Description control | |
| e-Mail (login) | marciana |
| update | |