Small Microseismic Acquisition System
Scheme of Small Microseismic Surface Acquisition System
Acquisition scheme. The blue curve shows the wellbore path
Triangles – the location of the sensors with the numbers
The vertical geophones GS-11D or similar are located on 1-3 m depth. Aperture diameter is about 800 m. The number of sensors equals 30-60 units (Figure 1). Coordinates of each sensor in the aperture are calculated with high precision on the basis of GPS. Data sampling is not more than 2 ms. Optimum depths for monitoring in this case are in the range of 2-4 km. Assumption that event time duration is not more that 50 ms.
The Schemes Examples and SMTIP Features of Acquisition Systems
Features:
- Small size of aperture ( 0,2 sq. km)
- High density of sensors: 200 sen./sq. km.
- Data sampling under 1 ms.
- Possibility of long duration observation ( more 2 weeks).
“Srediy Nazim” oilfield
“Oimasha” oilfield
“Nazim” oilfield
“Uzen” oilfield
“Ashiagar” oilfield
“Alatube” oilfield