Geologia regional e análise sismoestratigráfica de possíveis rochas - reservatório na área das Cordilheiras Mexicanas, na Bacia do Golfo do México

Abstract

This work promotes a regional interpretation of possible siliciclastic reservoir rocks for an area of approximately 105,000 km², from the use of 7,330 km of 2D seismic data within the Mexican Ridges area, and the analysis of 20 wells. This region is characterized by a folding belt created through contractional tectonics originated from sedimentary overload on Eocene overpressured shales, causing several detachment faults. Currently, only 9 wells have been drilled in the region, which characterizes Mexican Ridges as a little explored sub-basin. After the interpretation of 10 seismic horizons (Sea Bottom, Upper Miocene, Middle Miocene, Lower Miocene, Oligocene, Eocene, Paleocene, Cretaceous, Jurassic and Basement), isopach maps have been generated, which could give an indication of siliciclastic sediments. The deposition maps that best point in this direction were those of the Upper Miocene, Middle Miocene and Lower Miocene. Based on these data, I interpret characteristic facies classified by their amplitude, continuity, internal architecture, external form and lower limit surface. These facies have been classified as (1) Mass transport, (2) Hemipelagic sedimentation, (3) Turbidite channel, (4) Turbidite fan, (5) Volcanic and (6) Contourite. I have made a partial Wheeler diagram to the Lower Miocene and also I have made an analogy between the ages described by the well reports, the ages of interpretation and the age of Haq's eustatic curve (1988) in order to define if these turbidites were deposited in a regressive system. The mapping of these possible turbiditic fans allows the preparation of depositional maps for the Upper Miocene, Middle Miocene and Lower Miocene.