The East Java Basin, one of the oldest hydrocarbon-producing basins in Indonesia, has long been known as overpressured basin. This study aims to predict pore pressure and to analyze the causes of overpressure in study area. Northeast section of the East Java Basin (Figure 1 & 2). The understanding of this circumstances is expected to reduce and avoid issues related to overpressure presence in future exploration and exploitation wells. Data from 4 wells drilled in the study area showed varied pore pressure profiles. The pore pressure magnitude in this field can partly be estimated by using sonic data with Eaton Method, assisted by direct and indirect pressure measurement data as well as other well data. Mechanisms of overpressure generation is analyzed from geochemical analysis of source rock, well temperature, Dutta-Katahara cross-plot and burial history. The overpressure generation mechanism in the study area is interpreted to be caused by combination of factors and the top of overpressure turned out to be dissimilar with previously encounter in East Java Basin area.
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