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__NOTOC__
{{OR/17/037}}
This report describes the methodology and results of a ‘quick-look’ deterministic petrophysical study of lithology and reservoir quality for two wells near Liverpool (Figure 1). Geophysical logging curve responses were used to interpret output curves and formation averages using '''Interactive Petrophysics''' software under academic license (IPTM, Version 4.2.2015.61, LR- Senergy).

[[Image:OR17037fig1.jpg|thumb|center|500px| '''Figure 1'''    Location of wells deeper than 1 km in the vicinity of the study area (pink circle). The two wells interpreted in this report are inside the pink circle. ]]

Data available for each well in this study is summarised in Table 1. Data types and sources of data are discussed in more detail in the [[OR/17/037 Method#Data types and sources|Data types and sources]] section. How the data was prepared is outlined in [[OR/17/037 Method#Data preparation |Data preparation]] and the interpretation methods are described in [[OR/17/037 Method#Data types and sources|Data types and sources]] section. How the data was prepared is outlined in [[OR/17/037 Method#Petrophysical interpretation of lithology and porosity |Petrophysical interpretation of lithology and porosity]]. In addition, each well is described in its own appendix, and these include well sketches, and summary log plots of data available and petrophysical results etc, together with any explanations of well-specific details that differ from the general method provided in [[OR/17/037 Method|Method]].

Petrophysical results are provided in [[OR/17/037 Results|Results]]. The following curves have been interpreted for each well for this project based on geophysical log responses: Volume of clay ''(V<sub>CL</sub>)''; ''Identification of intervals of specific non-reservoir lithologies, in this case coals ''(V<sub>COAL</sub>)''; ''Porosity ''(PHIE & PHIT)''. For the Westphalian A and deeper strata in Ince Marshes 1, Total Organic Carbon (TOC) content has also been calculated. These are curves are provided separate to this report, both digitally as *.LAS files and as PDF log summary plots at 1:500 scale. More details can be found in [[OR/17/037 Results#Interpreted curves |Interpreted curves]].

From these curves and the wellbore stratigraphy ([[OR/17/037 Appendix 3 - Stratigraphic interpretations |Appendix 3 - Stratigraphic interpretations]]), reservoir properties were output by formation: Gross thickness; Net, Net to Gross and Average porosity and porosity range (across the net intervals) ([[OR/17/037 Results#Summary of reservoir petrophysical results |Summary of reservoir petrophysical results]], Table 6). The derivation of these outputs are described in [[OR/17/037 Results#Calculation of thicknesses, average values and ranges |Calculation of thicknesses, average values and ranges]].

[[OR/17/037 Results#Summary of parameters and quality of the output interpreted curves |Summary of parameters and quality of the output interpreted curves]] documents parameters used and gives a summary of the output data quality ([[OR/17/037 Results#Summary of parameters and quality of the output interpreted curves |Table 9]]). This, together with knowledge of the methods used to derive the outputs explained elsewhere in the report, should enable the reader to get an idea of the confidence that should be placed in the output results.

The reservoir quality and potential permeability is discussed in [[OR/17/037 Discussion|Discussion]]. The potential of the shale intervals as unconventional reservoir or source rock is discussed in [[OR/17/037 Results#Total Organic Carbon (TOC) calculation results |Total Organic Carbon (TOC) calculation results]].

<center>
{| class="wikitable"
|+ Table 1    Summary of data available for the wells studied
|- style="vertical-align:top;"
| rowspan="2" | '''Well'''
| rowspan="2" | '''Wireline logging services'''
| rowspan="2" | '''Input curves'''
| rowspan="2" | '''Total logged interval (m)'''
| rowspan="2" | '''Total length of core cut (m)'''
| rowspan="2" | '''Sidewall cores recovered'''
| colspan="3" | '''# of samples for each analysis'''
| rowspan="2" | '''TVD survey & max. deviation (°)'''
| '''Further details…'''
|- style="vertical-align:top;"
| '''XRD'''
| '''TOC'''
| '''XRF'''
| '''…in Tables 2, 3, 4 and 7 and…'''
|- style="vertical-align:top;"
| Kemira 1 (SJ47NE/101)
| GR, density, neutron, sonic over most, resistivity middle section only.
| 9
| 1405.7
| 0
| 0
| 0
| 0
| 0
| N, 6
| Appendix 1
|- style="vertical-align:top;"
| Ince Marshes 1 (SJ47NE/100)
| Standard quad-combo, DSI, FMI, ECS
| 45+
| 1085.7
| 198.7
| 98
| 47
| 82
| 8
| Y, 9
| Appendix 2
|}
</center>
[[Category: OR/17/037 Petrophysical interpretation of selected wells near Liverpool for the UK Geoenergy Observatories project | 03]]

OR/17/037 Introduction - Revision history

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Ajhil at 09:50, 13 July 2017