Inside CNH's Geological Atlas

Wed, 01/21/2015 - 09:15

CNH is tasked with ensuring that all participants in Round One have access to high quality data about the blocks and fields put up for tender. In addition to creating the Data Room, CNH also prepared a Geological Atlas. As Round One moves through different phases, this Atlas will be expanded to cover the blocks and fields being tendered at each stage. The shallow waters section covers the most prolific oil provinces in southern Mexico, representing around 80% of Mexico’s cumulative production and estimated prospective resources close to 10.702 billion boe. The document is intended to inform readers about the general and detailed geological characteristics of shallow water areas in the Southeast basins. It will also serve as a reference guide for companies even before they pay to access the Data Room.

The Geological Atlas begins with a section on the regional geological context, which describes the geological evolution of the Southeast basin. It indicates that this basin evolved in a passive margin context during the Middle Jurassic, when the Gulf of Mexico was beginning to open. It includes onshore and offshore shallow water areas where exploration began in 1979. The chapter details the boundaries of the basin and describes the three main basins in the province. For instance, the majority of the plays in the Salina basin consist of deltaic sandstones, coastal bars, and the Miocene and Pliocene turbidites that make combined structural traps, stratigraphic and associated extensional deformation structures, and salt. Hydrocarbons are mainly located in sandstones of the Miocene and Pliocene formations. In Pilar Reforma-Akbla, the hydrocarbons are stored mainly in Upper Cretaceous plays and Upper Jurassic oolitic limestone plays. Finally, hydrocarbon accumulations are trapped in the anticlines mainly produced by structural inversions and stratigraphic traps in the Pliocene formation of the Macuspana basin. This section includes contour lines, certain 2D and 3D seismic images of the blocks, and general information on the fields.

The Stratigraphic Framework includes a description of sediment facies and sequences, and their distribution from Jurassic to Pliocene, enabling parties interested in hydrocarbon exploration to get a detailed idea of the composition they may encounter in these basins. The Geological Atlas further describes the stratigraphic and lithographic characteristics of each underlying layer in the reservoir systems, while graphs provide easy access to information about reservoir flow and deposition systems throughout the different geological time periods.

The Structural Framework chapter describes the processes through which sedimentary sequence is deformed and the types of resulting oil traps. This chapter also deals with the structural characteristics of each province, for which it uses structural maps indicating the depths of each layer belonging to different geological time periods. Finally, the Petroleum Systems chapter describes the processes by which hydrocarbons were generated, their migration due to geological events, and their entrapment. This section uses overviews of precise facies and graphs to illustrate the behavior of hydrocarbons across the Southeastern basins, making it likely to be one of the more valuable sections of the Atlas for potential bidders.