Both hydrocarbon and geothermal resources may be harvested from intrusive and extrusive igneous rocks.
Case studies from Vietnamese granitic oil reservoirs and Indonesian andesitic hydrothermal reservoirs are used to illustrate how different rock types (lavas, pyroclastics, tuffs and intrusives) may be identified using electrical images and how their petrophysical properties may be evaluated resulting in revising drilling and completion strategies to optimize oil and steam production.
These reservoirs pose challenging problems for conventional log analysis given their low effective primary porosities and complex mineralogies, especially when there has been diagenesis which may enhance (fractures/vugs) or destroy (zeolite authigenic clays) reservoir quality.
Both hydrocarbon and geothermal resources may be harvested from intrusive and extrusive igneous rocks.
Case studies from Vietnamese granitic oil reservoirs and Indonesian andesitic hydrothermal reservoirs are used to illustrate how different rock types (lavas, pyroclastics, tuffs and intrusives) may be identified using electrical images and how their petrophysical properties may be evaluated resulting in revising drilling and completion strategies to optimize oil and steam production.
These reservoirs pose challenging problems for conventional log analysis given their low effective primary porosities and complex mineralogies, especially when there has been diagenesis which may enhance (fractures/vugs) or destroy (zeolite authigenic clays) reservoir quality.