Abstract

The early-middle Miocene aged Pagasa Formation is located offshore in the Southwestern Palawan Basin in the Philippines. 10 exploration wells have been drilled and over 3,000 km of 2D seismic has been acquired. The Pagasa Formation is a mudstone dominated regional seal with sandstone stringers. The project objectives are to examine the seismic facies and lithological characteristics of the high amplitude anomalous patterns associated with the Pagasa Formation and determine whether these anomalies are associated with hydrocarbon-bearing zones. AVO forward modeling results for the study area cannot distinguish gas from water at the high amplitude intervals. Well correlation of the AVO modelling for the studied anomalous sections showed and AVO class trend that are similar to water wet soft sand and water wet hard sand. The study revealed two types of acoustic impedance contrast associated with the high amplitude anomalies: high impedance associated with unconsolidated, moderately compacted silty/shaly sands, calcareous shales.

Keywords: Nido Limestone • Signal-1 • P296-1X • Aboabo-A1X • Pencscosa-1 • Sarap-1

Presented at: 2013 South East Asia Petroleum Exploration Society (SEAPEX) Conference, Singapore, 2013