Volume Clay Bound Water vs. Volume Clay

volume-clay-bound-water-vs-volume-clay

Composition Of Total Clay Volume
(Must Sum to 1.00)

Smectite (v/v)

Illite (v/v)

Chlorite (v/v)

Kaolinite (v/v)

Total Clay Volume
(Between 0.00 and 1.00)

Total Clay Volume (v/v)

Custom E Value For VCBW Equation
VCBWcustom=VCLAY/E

Custom E value based on composition

VCBW Using Total Clay Volume and Custom E

VCBW based on composition (v/v)

Instructions

This crossplot is used to estimate the volume of clay bound water (VCBW) when other mesurements are not available (NMR, Dielectric, Elemental and XRD). An understanding of caly types within the reservoir is required.

Start by entering relative volumes of smectite, illite, chlorite and kaolinite (these inputs must sum to 1.00). The associated E value is displayed as an output and can be used in the VCBW custom equation, VCBWcustom=VCLAY/E. Next enter total clay volume and read the VCBW output value.

Reference

The theory behind this crossplot is based on Dick Merkel's presntation titled Electrical Properties of Clays. The presentation was put together for SPWLA's Nuggets of Wisdom video series and can be viewed using SPWLA's member portal.

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