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The reservoir interval in the Malong Field, offshore West Malaysia, consists of three main types of sand bodies which are interpreted as a) prograding shoreface, b) shallow marine (inner-shelf), and c) fluvial channel sequences. The prograding shoreface sequence consists of upward coarsening units in which heterolithic sandstone-mudstone are overlain by ripple cross-laminated and parallellaminated sandstone. The inner-shelf sequence is made up of upward-coarsening offshore bar sandstones encased in shelf muds. The shelf sandbodies show evidence for deposition by storms, and are characterized by the association of distal, low-energy heterolithic facies overlain by proximal, amalgamated high-energy sandstone units. The fluvial channel sequence consists mainly of trough cross-bedded sandstone, intercalated with minor floodplain mudstone. The Malong sandstones are buried at depths of not more than 150 m, and are probably in the early stages of diagenesis, as shown by the well-preserved depositional (primary) porosity. The porosity and permeability of the sandstones are related to depositional environments. Poroperm values are highest (ell = 25-36%, K = 100-800mD) in the channel and storm-deposited inner-shelf sandstones. Shoreface sandstones have slightly lower poroperm range (ell = 24-35%, K = lO-lOOmD), but are still considered as high-quality reservoirs. permeability barriers (ell = 10-22%, K<10mD) may be formed oflower shoreface and offshore mudstones. INTRODUCTION The Malong Field is located near the southwestern margin of the Malay Basin, offshore Peninsular Malaysia (Fig. 1). Two exploration wells, 50-17.1 and 5G-17.2, were drilled on the western flanks of the Malong structure, and penetrated a lower Miocene alternating sandstone-shale sequence that rests on pre-Tertiary granitic basement. A sedimentological study was done to interpret the depositional environments, and examine the reservoir characteristics of the sandstones. This paper presents a summary of the results of the study. GEOLOGICAL SETTING The Malong Field is located on the Tenggol Arch, a basement horst block which separates the Malay and Penyu basins (Fig. 1). the basement is believed to be formed mainly of pre-Tertiary igneous and metamorphic rocks. Presented at GSM Petroleum Geology Seminar 1988

Depositional environments, diagenesis, and porosity of reservoir sandstones in the Malong Field, offshore West Malaysia