Introduction

The Tinggi field is the fifth field put on production by Esso Production Malaysia Inc (EPMI), off the East Coast of Peninsula Malaysia. It is the first proposed for development on the basis of only one exploration well. Currently it produces from four different sandstone units namely the J-6, J-17, J-18/20 and K-20/30. The Tinggi field is located approximately 260 kilometres east of Kuala Trengganu Figure 1 in 73 metres of water. Of the twenty-seven wells presently planned for the field, twenty-five have been drilled to date and of these, only one well was sidetracked to an alternate location due to hole problems.

STRUCTURE

The Tinggi structure is a relatively small east-west trending anticline cut by a north-south trending fault on its east end. The structure is asymmetrical with a steeper dipping south flank as compared to the north flank. The vertical relief is approximately 100 metres. At the J-15/20 oil-water contact, it is 4.5 kilometres long and 1.5 Kilometres wide. (Figure 2)

EXPLORATION HISTORY

The existence of the Tinggi anticline was first seen as a lead in the 1974 seismic survey carried out by Esso Production Malaysia Inc. As a result, delineation lines were shot in 1978 and the Tinggi anticline was confirmed. This, in turn, led to the drilling of the Tinggi 1 exploration well which was spudded in July 1980. The well was drilled on the northeast side of the field, slightly downdip from the crest in order to test group J seismic anomalies at that structural position. The group K sequence was a secondary target.

Tinggi 1 discovered four group J reservoirs, Figure 3, the J-15, J-16, J-17 and J-18/20 sands ones, two group K reservoirs; the K-10 and K-20/30 sand- stones, and one group L reservoir, the L-10 sandstone. The J-15, J-16 and L-10 were gas-bearing in the well while the other four reservoirs encountered oil. Pressure data indicated that the four group J reservoirs are in a common fluid system, and that reservoir separation exists between the K-10 and K-20/30 sandstones.

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