Deep Water Gulf of Mexico Lower Tertiary Pressure Study

Introduction

A significant new study, which provides a comprehensive and authoritative picture of formation pressure distribution in the region, based on data from 149 wells.

So, how much does it cost to drill a dry hole in the Wilcox?

Although a number of high-profile discoveries have been made to date in the Wilcox play, e.g. Tiber, Cascade & Jack, costs of $150-$250 million per well have also generated some expensive dry holes, in search of hydrocarbons trapped beneath salt, e.g. Sardinia & Hadrian. Many of these wells have experienced high pressures, some with narrow drilling margins and it is believed that understanding pressures will assist greatly in future exploration and development of this important play.

Benefits
  • Reduced drilling risk with associated savings to time and cost
  • A coupled pressure-geological model to aid calibration of velocity-based pressure prediction in un-drilled areas
  • Potential to increase reserves close to existing facilities plus identify new exploration potential
  • Improved understanding of the regional pressure regime and its part in controlling aspects of the petroleum system, including trap integrity and regional/field-scale fluid flow
  • More accurate placement of appraisal wells
Deliverables
  • Maps and plots illustrating the overpressures across the area in the Deep Miocene and Lower Tertiary Wilcox intervals
  • Chapters exlaining evidence for lateral drainage in sub-salt reservoirs and implications for exploration in the region
  • Multi-Well Pressure – Depth plots for formation pressures
  • Analysis of 28 key wells in which full shale-based pore pressure prediction has been completed, as well as an exploration of the relationship between reservoir pressures and shale pressures
  • Lithostatic and fracture pressure models which can act as predictive algorithms for future well-planning

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