SEAPEX at Perth
A quick resume on SEAPEX Meeting Chapter at Perth on 25th of March 2009 on Murray Street
Dear Explorers,
Summary of SEAPEX (by Peter Baillie-TGS Nopec)
The main idea of the presentation, I think to introduce how well the backscatter technology revealed the resolution to identify where the HC seep is on top of Seafloor, with examples taken accros Indonesia deepwater area of exploration.
A) SEASEEP:
1. High resolution multibeam bathymetri and backscatter which could image
- up to 100% seafloor topography, define structure trend and modern offset
- Identify location and concentration of HC seep for coring by using function of hardness of seafloor (impendance), roughness of seafloor and volumetric scattering. It works like a sonar signal)
2. Hull mounted sub bottom profiler (seismic to 100ms) to locate hazard, gas chimney and gas clouds)
3. Powerful combination with grav mag
4. Navigating the piston coresB) PROJECTS
1. SO far in Indonesia TGS Nopec has these list :
- 2D seismic of 34000 line km across N sumatra, Sunda, Bone, Banggai Sula, Misool Onin, Seram, Jamdera, Kumawa and Cendrawasih
- Multibeam 400,000 km2
- GravMag 140,000 line km
- Sediment Cores
- Geochem area
- Heatflow probesC) PROJECT EXAMPLES
1. ?Chirpline (Around Salawati Basin to SW)
Usng Backscatter Tgs claimed to have this analysis :
- 434 Carbon Isotopic ratio sets distinguished gas
- Biomarker analysis suggest that the SR come from Mesozoic as in NWS Australia, and Tertiary Marine
2. Cendrawasih Bay
-2006 Perception
Basement consist of Granit and exposed Gneiss along margin
Non prospective tectonic model
Neogene Rift
-Analisis taen in the eastern coast of Cendrawasih (waipago through) Bay along from Yapen Island
Mud Volcano is observedwith some HC effect seen on Seismic reflection
HC Seep observed in the ?fold belt which appears in seafloor
29755 km SEASEEP analysis project is heading forward3. Andaman (North Sumatra)
-Multibeam seep project of 20626 km2
-2D Seismic line of 1464km
-?ForeArc Basin type (but TGS Nopec is willing to call this is not a classic foreacr basin but ?continuation of continental something)
-Analog for this type of Basin found at Japan and ?AlaskaTgsnopec.com would be one of resource to dig out the infos, I would reckon
Salam GEA
May 18th, 2009 at 11:09 pm
instantly recognized the area Lo..
May 19th, 2009 at 11:12 am
Hi ilo, bloody brilliant.. anyway do we have oil seepages on seafloor in NW Shelf, since I’m concern in Barrows Subbasin and how to determine those seepages through multibeam? cheers
May 20th, 2009 at 8:44 pm
i only can say…wow!!!
May 20th, 2009 at 11:03 pm
Mexi!!!
Mexi, in a report I’ve read about these multibeams Illo mentioned about; the physical and geophysical attributes of the seafloor could be affected by these fluid seepages and its biologic and mineralogic manifestations. once the multibeams were map, we will be able to identify anomalous bathymetry that might be related to seepage, because the seep occurrence will affect the seafloor roughness and impedance.
Not much of an info isn’t it, but I’m sorry, I can give you a full report. But I’ll email you the references cited on the report. Is that OK?
May 20th, 2009 at 11:09 pm
oopss typo there.. *I can’t give you a full report.
May 24th, 2009 at 10:42 am
Hi Mexi, Cessy n Saut
iya nih seperti yang disampaikan oleh Cessy, metode ini menggunakan gelombang suara yang ditembakkan ke dasar laut dan akan dikembalikan ke receivernya, mirip sonar. Ide nya adalah bahawa batuan dengan Hc memiliki properti yang berbeda dalam memantulkan gelombang suara tersebut sehingga dapat di bedakan mana yang berasal dari daerah yang memiliki HC atau tidak. Multibeam technologi ini mengclaim bisa membuat peta topografi dasar laut dengan akurasi yang tinggi dan menawarkan coring pada daerah yg teridentifikasi sebagai seepage di dasar laut.
tentang Barrow delta, nah itu ada di laporan disini nanti pv ya, hahahahaha