BM Platform, B Field, Offshore Northwest Java: A Case History of Multi-Disciplinary Integration Including 3D Seismic, Reservoir Simulation and Horizontal Drilling
Authors: Cooke D. , Aziz A. , Baldauff J. , Diswarin N. , Guillory R. , Haryanto A. , Klein J. , Listiani E. , Mallary C. , Morrow J. , Muryanto T. , Oentarsih K. , Pathak P. , Paskvan F. , Pramudita B. , Widaningsih L. 
Published: December 2007

D. Cooke SPE, Arco Indonesia, A. Aziz SPE, Arco Indonesia, J. Baldauff SPE, Arco Exploration and Prod. Tech., N. Diswarin, Arco Indonesia, R. Guillory SPE, Arco Indonesia, A. Haryanto, Arco Indonesia, J. Klein SPE, Arco Exploration and Prod. Tech., E. Listiani, Arco Indonesia, C. Mallary SPE, Arco Indonesia, J. Morrow SPE, Arco Indonesia, T. Muryanto, Arco Indonesia, K. Oentarsih, Arco Indonesia, P. Pathak SPE, Arco Exploration and Prod. Tech., F. Paskvan SPE, Arco Indonesia, B. Pramudita SPE, Arco Indonesia, L. Widaningsih, Arco Indonesia

Abstract
This case history describes how a multi-disciplinary team used a 3D survey and reservoir simulation to review and revise the development plans for the BM platform, located in the B Field, Offshore Northwest Java, Indonesia. The case history starts with the collection of necessary petrophysical, geologic and production data. These data are input to a reservoir simulation which shows there should be no problems with the new platform. However, this initial simulation has known problems with contradicting input structure maps and fluid contacts. Hopefully, these problems can be addressed with a new 3D seismic survey - if the seismic data can be acquired, processed, interpreted and input to the simulation before drilling starts at the BM platform. The seismic acquisition could not be done with the traditional towed seismic streamer cables - instead stationary ocean bottom cables with dual geophone-hydrophone sensors were used. Processing of the seismic data was done in a way that allowed interpretation of the critical area even before acquisition of the entire survey was finished. The new 3D structure maps changed the MDT's opinion of what reservoir and what areas contained the bulk of the oil reserves. Unfortunately, the new maps were not available until after the jacket was set but before the wells drilled. The MDT updated the simulation with the new 3D data, which led to changes in development well bottom hole locations and an ambitious horizontal well.

Introduction
B Field is an offshore oil field operated by Arco Indonesia located in the Java Sea about 100 km Northeast of Jakarta, Indonesia. This is a 200 MMBO field with 12 different sandstone reservoirs between -2800 ft, and -3800 ft. The field is currently producing from 13 different platforms at a rate of about 18,000 BOPD. This case history concerns the BM platform, the most recent platform set at B Field.
In 1994 a multi-disciplinary team (MDT), similar to that described in Ref. 1 was formed to review development opportunities at B Field. The MDT team has full time members from the disciplines of development geology, development geophysics, reservoir, drilling, operations and production engineering. The charge of this MDT is to increase the rate and reserves at B Field through new drilling, but not to get involved with the day-to-day production operations. When the team started work, one of the first areas they focused on was the upcoming BM platform. The planning and approval process for BM platform had already been completed before the MDT was formed, but BM received additional attention because the team feared that it might suffer from the same problem as the older BJ platform (located in the same fault block as BM - see Figure 1.) At BJ platform, the initial delineation well was drilled in 1987 and found oil and no water. By 1990 when the BJ development wells were drilled, the oil reservoir had been swept by water because of a strong water drive combined with production from other platforms located updip. The exploratory well that delineated the BM platform area was drilled in 1989 (this is the B-17 well, later to be renamed the BM-1 well). Since the BM development wells were to be drilled in 1995, there was more than enough time for the same water encroachment problems that plagued BJ to affect BM.
A new 3D seismic survey and a reservoir simulation were used to study if water could have moved through the BM platform area. As the rest of this paper will show, the reservoir simulation found that water encroachment is not a severe problem at BM, but other geologic structure problems and platform location problems were uncovered. These problems - and their subsequent solutions - would not have been anticipated without the MDT's review of the BM platform, and the platform might have been an economic failure.
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