RIASSUNTO
Abstract
Tunu is a gas field located in the eastern part of Mahakam Delta, EastKalimantan, Indonesia. The field has been produced by TotalFinaElf E&PIndonesie since 1984 in the sensitive ecosystem. The other main activities inthe delta are shrimp farming and fishing activities. The delta is of economicalimportance in terms of fish and shrimp resources due to the use of delta asspawning ground and feeding ground.
A 2D survey has been carried out in transition zone and deep water zone inthe eastern part of Tunu. Most seismic lines were overlapping with the fishinggrounds of more than 1200 fishermen in the area of 400 km2. Managingseismic operation in such sensitive area needs careful planning. Seismic surveyshould be planned, organized, and implemented in an environmentally safe mannerto prevent several complex problems that could emerge. The followingprecautions has been taken long time prior to the operation and continuedduring the seismic operations:
Socialization of seismic activities to local communities prior to theoperation
Co-ordination between local government/regulatory agencies, localcommunities, contractor, and company
Establishment of Working Committee which consists of representatives fromcompany, local government, and local community
Tests for environmental effect assessment of airguns
Extensive fish catch monitoring prior to, during, and after seismicoperations.
The overall approaches have resulted in conclusion that there is nosignificant impact from the seismic operations and that adverse impact could beminimized hence leading to acceptance of seismic operations by all level oflocal communities.
Introduction
TotalFinaElf E&P Indonesie, an affiliate of the French oil and gascompany TOTALFINAELF, is a production sharing contractor to the Indonesianstate oil company, Pertamina. One of TFE EPI growing gas field is Tunu field,located at Mahakam Delta, east coast of Kalimantan (Figure 1).
The estuarine ecosystem has been of economical importance due to itsrichness of resources, which attracts many people to come and live in the areaand make benefits from the delta resources. Not less than 1200 fishermen existsin the area, including transient fishermen who live upstream of the delta.
During mid 2001, a 2D seismic using airguns and dynamites was carried out inthe east side of Tunu Block, i.e. along the northern coast of Mahakam Delta.The aim of the survey was to map the gas reservoirs and locate possibledrilling targets several thousand meters depth. Surveys in these areas needs tobe managed properly due to their ecological and social sensitivity. Therefore,the challenge was operate seismic survey in the area by minimizing oreliminating the impact that the operation could have on the environment andcommunities.
Although the seismic survey was implemented according to planned schedule,there were also several complex problems encountered due to environmental andsocial sensitivity of the area. To manage the problems, a series of approachesand management solutions were implemented from the planning stage until theoperational stage which resulted in a successful seismic survey.