Remote sensing surveys method for optimization of oil & gas prospecting

Transcription

1 Remote sensing surveys method for optimization of oil & gas prospecting To optimize prospecting it is proposed the expert interpretation of space images as a relatively fast and inexpensive method for new prospective sites. It allows to: determine location of such plots in the regional structure and predict their main features, increase prospecting efficiency, decrease the workload, and reduce the risks, The innovative solution are proposed in the following areas: (1) expert express evaluation of the licensed plots before they will be bought (2) help in geological interpretation of 3D seismic surveys using space survey data (3) detection of the most promising areas for further detailing works, including joint interpretation of space survey results, geological and geophysical data By: Dr. A.A. Yantsevich, Tetrale Group, Dr. A. Kostyukevich, Tetrale Technologies, Dr. L.V. Miloserdova, Russian State Oil&Gas university, Dr. N.I. Maloushina, private consultant 1

2 An example of the expert express evaluation of a licensed plot and interpretation of 3D seismic based on space survey data 2

3 Fragment of space image with elements of geological interpretation in the area of 3D survey Example of the expert express evaluation of a licensed plot and geological interpretation of 3D seismic with use of space survey data Fragment of space image Landsat ETM with 3D survey site 1: Survey site with interpreted circular geological feature 3

4 Site #2 Surface DWABAMUN (1) DELKPT (2) CATHEDRAL (3) PRECAMBRIAN (4) Combination of space photography with slices of 3D DMW images cube 4

5 3D images of area including 3D survey site (Combination of numerical model with space photography) 5

6 Example of detection of the most prospective plots for the further detailed works based on joint interpretation of geological, geophysical and space data 6

7 Scheme of the geological deciphering in the ring structure area In conditions when the bedrocks are overlapped by a thick cover of Quarternary sediments, and the landscapes are heavily changed, the anticline structures can be poorly seen in the space images. The example is the local ring structure located at the northern edge of the Dneprovko-Donetsky basin (Ukraine) close to Skvortsovskoye and Yul evskoye oil-gas condensate deposits. It may be seen in the space images (especially Landsat TM and Landsat ETM) well enough. The structure has ellipsoidal concentric form, its long axe has north-east extention; the structure sizes are 12x7 km. In the modern relief it is displyed as an uplift slotted along the long axe by a river valley. In the detailed structural maps of the Skvortsovskoye and Yul evskoye plots for the reflecting horizons Vb 2-п (C 1V2 ) и Vb 3-п (С 1 v 1 ), the structure is not displayed, but the external arch elements of the structure match very well to the disjunctive dislocations displayed in the same maps. The contours of the Skvortsovskoye and Yul evskoye deposits adjoin orthomorphically to the peripheral part of the structure. The ring structure displayed in the space image Landsat TM is interpreted as an anticline (Dneprovsko-Donetskaya province, Ukraine) elements of the ring structure and lineaments aligning with faults revealed by geological and geophysical data 7

8 3-D image of a ring structure in the modern relief (digital relief model with overlapped space image) Correspondence of the space images interpretation scheme and the structural maps of the reflecting horizons of the oil gas condensate deposits gas condensate deposits oil deposits fractures revealed by seismic data recommended plot 8

9 Summary Remote sensing is especially useful in the areas where there is little seismic coverage (such as Canadian North, Russia Far North, Eastern Siberia, off-shore, etc.). The remote sensing services are very complimentary to 2D- and 3D DWM service offering, allowing to identify complimentary features in surrounding to the 3D seismic survey site area and fill gaps within the system of 2D seismic lines. It also allows meeting new prospects for both DWM and seismic modeling services 9