The hydrocarbon reservoir of lower triasic of Hassi Berkine (TAGI‐HBNS) belongs to the oil province of Algerian Sahara. The principal petrophysical parameters were measured by logging on intervals of 0.15 m. of whole. It was explored by 61 wells drilled by Sonatrach/Anadarko. Tests performed at the well, prior to field production of HBNS, have observed pressure responses between wells over distances of 10km. This fact demonstrates good lateral continuity of the reservoir layer and stationarity of petrophysical parameters. This stationarity allows the geostatistical modeling of petrophysical parameters and estimation of hydrocarbon resources using ordinary kriging. A Principal Component Analysis (PCA) was performed on mean values of petrophysical parameters in the layer. The results of PCA have identified the principal associations. Sometimes the zones of favorable facies can be saturated with water. For the reasons cited above, the ordinary kriging is used for modeling and estimate of hydrocarbon volume per unit area. This volume is expressed by the regionalised variable ‐ product “PHIE.SH.H”, where H is the thickness of layer. This approch has made possible to eliminate the zones which are saturated in water, the estimation of hydrocarbon resources in blocks of one km2 surface, calculate and mapping their variances.


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