--> Clastic Reservoir Quality: A Multi-Disciplinary Approach Based on of Field-Sampling, Satellite Mapping, Geodynamic and Provenance Analysis

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Clastic Reservoir Quality: A Multi-Disciplinary Approach Based on of Field-Sampling, Satellite Mapping, Geodynamic and Provenance Analysis

Abstract

Abstract

Plate tectonic analysis, detailed satellite structural mapping, DEM-based drainage morphotectonic, provenance and exhumation techniques were developed into an integrated workflow to predict the quality and distribution of clastic reservoirs. The source to sink study and reservoir predictions are based on three fundamental pillars: 1) Outcrop sampling of proven sandstone reservoir intervals focused on the application of provenance and exhumation techniques. Provenance studies are based on a combination of Automated Mineralogy Analysis (AMA) data and semi-quantitative classic petrographic analysis. Samples are analysed with a scanning electron microscope at a 10μm resolution allowing the rapid acquisition of the relative abundance of main constituents and the heavy mineral assemblage. Quantitative estimates of feldspar and garnet species formed the basis of provenance parental analysis. Classic petrographic analysis built on the AMA results allows increased resolution of the provenance signal through diagenetic considerations and lithic analysis. AMA results allow the identification of the samples best suited for exhumation analysis using detrital Zircon and Apatite; 2) Review of the geodynamic model of the study area. Tectonics is one of the most important factors controlling landscape and drainage evolution. The age, kinematics and amount of displacement of the main tectonic lineaments is understood through a combination of detailed structural mapping of satellite data, gravity analysis, exhumation data and literature review. This information is then integrated into a global plate model; 3) Integration of satellite-derived lithostratigraphic and structural mapping with quantitative drainage geomorphology develops an understanding of the Tertiary evolution of the drainage systems.

The provenance and exhumation results are integrated with large environmental data sets, which are then rotated back in time using the revised geodynamic model to define the palaeogeography and drainage evolution of the area. Estimates of clastic supply and reservoir quality can then be made. This methodology has been tested and has provided important reservoir information in geologically complex areas; examples will be presented for SE Asia, Colombia, Venezuela and the Gulf of Mexico.