Pampo, Linguado, and Badejo Fields: Their Discoveries,Appraisals, and Early Production Systems
Authors: Tigre C.A. , Schaller Hannfried A. , Del Lucchese Cesar , Possato Sergio A. 
Published: October 2008

The three oil fields Pampo, Linguado and Badejo are located in the southwesternmost known producing areas of the offshore Bazilian Campos Basin. They were discovered as a result of reflection seismic survey and produce from fractured lower Cretaceous (Neocomian) basalts, coquinas of the Aptian Lagoa Feia Formation, carbonates of the Albian Macae Formation and from Eocene sandstones of the Carapebus Member of the Campos Formation.

This work describes the prospects, their results, the main reservoirs, correlations, continuity and diagenetic problems. Two early production system are in operation engaged in gathering a better knowledge of the fields for the planning of a definitive production system.

INTRODUCTION

The oil fields Pampo, Linguado and Badejo cover a NW-SE trending surface, 17 kilometers long and 3 kilometers wide, comprising roughly 51 square quilometers.

They are located 115 kilometer SE of Campos city, in water depths of 85m (Badejo) to 120m (Pampo). (Fig. 1).

The present knowledge of the fields was achieved through the results of 41 wells, 27 of which were producers, and a 3D seismic survey.

The original in place volumes amount to 142 million cubic meters (894 million bbl-st) of oil 6 and 8,941 × 106 cubic meters (312, 965. 415 × 106 cubic feet) of gas.

Two early production systems are collecting the production from 8 wells with an average daily oil production of 5,070 cubic meters (31,890 bbl/d). A third production system is being installed. Accumulated production through December 1982, was 1,550.8 M cubic meters (9,754.3 Mbbl).

The main significance of the present work is the possibility of learning the behaviour of non-conventional reservoirs, as fractured basalt and non-marine coquinas underlying conventional reservoirs of marine carbonates and turbiditic sandstones, through early production systems.

STRATIGRAPHY

The stratigraphic colymn of the area (Fig. 2), as in the Campos Basin1, comprises Mezozoic and Cenozoic rocks. The lowest known section is made up of tholeitic, vesicular locally breccoidal, fractured basalts comprising several lava flows of Neocomian age.

The sedimentary section consists of a superposition of four lithostratigraphic units.

The Lagoa Feia Formation is composed of alluvial fans, fluviodeltaic and lacustrine sandstones, coquinas and shales overlain by evaporites of Aptian age. Its thickness in the area varies from 90 to 600 meters.

The Macae Formation of Albian-Cenomanian age, is made up of oncolitic limestones with minor intercalations of calcilutites, marls, sandstones and shales. According to its depositional history, this formation is subdivided into a lower and an upper unit. The lower Macae represents the Albian shallow carbonate platform system, with 2 oncolitic calcarenities forming offshore shoals (Fig. 3), whereas the upper Macae corresponds to the Cenomanian basinal to slope hemipelagic calcilutites. The thickness of this units in the area varies from 560 to 970 meters.

The Campos Formation consists of prodelta and deep water shales (Ubatuba) as well as local sandstones turbidites (Carapebus). Activity of Terciary canyons are remarkably shown by evidence of cut and fill throughout the sequence.