Well Log Interpretation

Brief

Well Log Interpretation is a summary of a well log. Used in Mature Water Flood Analysis for calculating HCPV for Blocks and Patterns.

Summary Equations

$h_{gross} = \Sigma h_{gross}$

$h = \Sigma h$ where Saturation=Oil

$\phi = \frac{\Sigma (h*\phi)}{\Sigma h}$ where Saturation=Oil

$S_o = \frac{\Sigma (h*\phi*S_o)}{\Sigma (h*\phi)}$ where Saturation=Oil

where

$h_{gross}$ = Gross thickness, m2

$h$ = Net pay, oil saturated thickness, m

$\phi$ = Porosity, fraction or %

$S_o$ = Oil saturation, fraction or %

Example

Calculate the summary of the well log interpretation above for the Б2(С1) reservoir.

$h_{gross} = 1+1.5+1+0.9+0.6+1.2+1.7+5.2+5.8+0.7+0.7+1.3+0.8+1+0.6+1+1.5+0.9+0.7+1.1+2.2+1.1+2.6 = 35.1 m$

$h = 1.2 + 5.2 + 5.8 + 1 + 1.5 = 14.7 m$

$\phi = \frac{1.2*13.4 + 5.2*19 + 5.8*12 + 1*17.2 + 1.5*16.6}{1.2 + 5.2 + 5.8 + 1 + 1.5} = 226.58 / 14.7 = 15.4%$

$S_o = \frac{1.2*13.4*0 + 5.2*19*97.1 + 5.8*12*94.8 + 1*17.2*0 + 1.5*16.6*0}{0 + 5.2*19 + 5.8*12 + 0 + 0} = 19161.6 / 168.4 = 96.1%$

Parameters

• Reservoir
• Zone
• Top MD
• Bottom MD
• h_gross - gross thickness
• h - net thickness
• Saturation
• RT - resistivity
• Porosity
• Sw
• So
• Sg
• k_absolute
• k_oil_effective
• kh_oil
• k_gas_effective
• kh_gas
• Version
• Date Interpreted

Upload

Well Log Interpretations are uploaded to the E&P Portal here.

See Also

• Well
• Perforations
• Well Log Interpretation
• HCPV