ABSTRACT: Successful integration of 4D seismic
in reservoir management, Duri
Steamflood, Sumatra
Sigit, Rusdinadar, David E. Moore, and Adi Widyantoro , PT Caltex Pacific Indonesia, Pekanbaru, Indonesia
After a successful single-pattern field trial in 1995, time-lapse (4D) seismic
was
applied to help monitor steam flow in the Duri Field, Central Sumatra, one of the largest
steam flood recovery projects in the world. The
seismic
, together with conventional
steam-monitoring technologies, generates steam-flow images critical to effective and
efficient management of heat in the reservoir.
To obtain seismic
data with the best possible signal-to-noise ratio and insure survey
repeatability during data acquisition, the shots and receivers are buried below the
soft-weathering layer. The acquisition geometry has recently been modified to
appropriately sample the upcoming wavefield to better accommodate pre-stack depth
migration processing.
In the interpretation of the data, statistical classification methods use multi-seismic
attributes to produce reliable maps of the reservoir steam flow.
Seismic
data are
converted to useful engineering data using techniques which combine velocity core
estimates with reservoir and
seismic
modeling
. These steam maps help the day-to-day heat
management operations such as choke installation to redirect steam flow, steam isolation
in sands where breakthrough has occurred, and shutting in appropriate injector wells to
manage producer well heat problems. These maps are also used for longer-term strategic
objectives such as locating by-passed oil, redesigning injector patterns, and locating
pre-heated zones. This technology results in more efficient heat management of the
reservoir and has a significant positive impact on recoverable reserves.
This paper will address a range of topics including seismic
acquisition and processing,
modeling
and analysis, impact on EOR and heat management processes and expected economic
benefits.
AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia