Integrated Geostatistical Reservoir Characterization of Turbidite Sandstone Deposits in Chicontepec Basin, Gulf of Mexico

摘要

This paper presents a pixel-based hierarchical geostatisticalmodeling of submarine fan turbidite sandstone deposits inTajin and Agua Fria fields of Chicontepec basin in the Gulf ofMexico. Methods are discussed for identifying and dividingthe stack of heterogeneous siliciclastic sediments in thesefields, using sequence stratigraphy, petrophysical well logcharacteristics, geological facies model and 3D seismic data.An integrated multidisciplinary geostatistical reservoircharacterization is conducted in two main steps. First, a largescalereservoir framework of multiple sequence andsubsequence surfaces is constructed based on the integrationof data sources of geologic well markers, petrophysics, andseismic horizons. Second, high-resolution 3D distributions ofreservoir properties are generated, accounting for inherentinter-relationship among reservoir property data and the threemain data scales of log, sub-sequence layer andsequence interval.At onset, shale volume content in Tajin field and totalporosity in Agua Fria field are modeled. Block kriging, trendmodel, and conditional thickness-weighted Bayesian schemeare presented for the integration of data types and data scales.Facies distributions in Tajin are modeled by indicator krigingconditioned to Vsh content, and hence to seismic. Porositydistributions are by sGsim collocated with Vsh for each faciesgroup, and water saturation distributions are collocated withporosity. Permeability distributions are function of porosity,water saturation, facies and sub-sequences. In Agua Fria,effective porosity and facies are by p-field related methods.Patterns of sand continuity and pay sand connectivity arederived and uncertainty in their prediction is evaluated.