## 2 Materials and Methods
### Brief Description of the Reservoirs
\begin{table}
\begin{tabular}{c c} \hline \hline
**Geological and Technological Parameters** & **Abbr., Units** \\ \hline Average general thickness & H\({}_{\text{o}}\), m \\ Average oil-saturated thickness & h\({}_{\text{oil}}\), m \\ Porosity & \(\phi\), \% \\ Average initial oil saturation & K\({}_{\text{oil}}\), unit fractions \\ Permeability GPFP & k\({}_{\text{SPP}}\), \(\upmu^{2}\) \\ Net-to-gross sand ratio & NTG, unit fractions \\ Compartmentalization & K\({}_{\text{comp}}\), units \\ Average oil dynamic viscosity in the formation & \(\upmu\), mPa\(\cdot\)s \\ conditions & \(\upphi\), g/cm\({}^{3}\) \\ Oil density in the formation conditions & B\({}_{\text{o}}\), bbls/stb \\ Formation volume factor & B\({}_{\text{o}}\), bbls/stb \\ Paraffin content & PC, \% \\ Average gas-oil ratio & GOR, m\({}^{3}\)/m\({}^{3}\) \\ Bottom hole zone (BHZ) hydroconductivity & \(\epsilon_{\text{b}\text{h}\text{z}}\), \(\upmu^{2}\)\(\cdot\)cm/(mPa-s) \\ Farfield hydroconductivity & \(\epsilon_{\text{farfield}}\), \(\upmu^{2}\)\(\cdot\)cm/(mPa-s) \\ Bottom hole zone (BHZ) permeability coefficient & k\({}_{\text{b}\text{h}\text{z}}\), \(\upmu^{2}\)\(\cdot\)m\({}^{2}\) \\ Farfield permeability factor & k\({}_{\text{farfield}}\), \(\upmu^{2}\) \\ Piezoconductivity & \(\chi\), \(\upmu^{2}\)\(\cdot\)s \\ Reservoir pressure & P\({}_{\text{res}}\), MPa \\ Bottom-hole pressure & P\({}_{\text{bb}}\), MPa \\ Bubble pressure & P\({}_{\text{b}}\), MPa \\ Well skin factor & S \\ Total reservoir thickness GWSIR & H\({}_{\text{total}}\), m \\ Average thickness of an oil-saturated interlayer GWSIR & n\({}_{\text{av}}\), m \\ Net pay thickness GWSIR & H\({}_{\text{pay}}\), m \\ Oil-saturated reservoir thickness GWSIR & h\({}_{\text{sat}}\), m \\ Oil saturation factor GWSIR & K\({}_{\text{sat}}\), unit fractions \\ Porosity GWSIR & \(\phi_{\text{GWSIR}}\), \% \\ Permeability GWSIR & K\({}_{\text{GWSIR}}\), \(\upmu^{2}\) \\ Oil production rate before the operation & qoil, barrels/day \\ Liquid production rate before the operation & qliq, m\({}^{3}\)/day \\ Compartmentalization for oil layers & K\({}_{\text{comp(oil)}}\), units \\ \hline \hline \multicolumn{2}{c}{Efficiency Parameters} \\ \hline Maximum oil production rate after RJD & barrels/day \\ Effect duration & days \\ Average daily oil production rate increment & barrels/day \\ Incremental oil production total & barrels \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Investigated parameters. Table 2 demonstrates the results of \(t\)-test calculations for all wells. The values with a \(p\)-value under 0.05 (with the likelihood of differences in the compared data of over 95%) are highlighted in bold. It means that the studied parameter has a statistically relevant (not random) effect on the differences between the index values in the selected data sets. The values with a \(p\)-value ranging from 0.05 to 0.10 (also has some effect) are highlighted in italics. N1 and N2 mark the data selections for the first and the second group, respectively. R is the correlation coefficient between geological parameters and efficiency parameters. R was not high, but many parameters were significant at the \(p\)-level \(<\) 0.05, and for evaluating the influence of geological parameters on the efficiency parameters, in this case, we proposed the calculation of \(t\)-test between groups with different efficiencies. All the wells and the respective parameters were divided into two approximately even data sets selected by one of the efficiency indexes. Statistically irrelevant results were not included. The \(t\)-test values were also calculated separately for different sites. During the research into the influence that these parameters have on the efficiency indexes, the following conclusions were made using the Student's \(t\)-test [22; 25; 26]:  
1. For the Fm site, the main influence on the efficiency is from the conductivity and permeability of the reservoir farfield, piezoconductivity, oil saturation, and oil-saturation thickness.