ISO 4657:2022

INTERNATIONAL ISO
STANDARD 4657
First edition
Assessment specification of coalbed
methane resources
Spécifications d’évaluation des ressources en méthane de houille
PROOF/ÉPREUVE
Reference number
ISO 4657:2021(E)
© ISO 2021

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ISO 4657:2021(E)
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© ISO 2021
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ISO 4657:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General principles . 2
4.1 Objective. 2
4.2 Basic requirements . 2
5 CBM resource evaluation workflow .2
5.1 General . 2
5.2 Data collection and collation . 2
5.2.1 Geophysical data. 2
5.2.2 Regional geological data . 2
5.2.3 Drilling data . 3
5.2.4 Laboratory test data . 3
5.3 Geological conditions analysis . 3
5.3.1 Determination of exploration degree . 3
5.3.2 Geologic map compiling . 4
5.3.3 Comprehensive analysis . 4
5.4 CBM resource calculation . 4
5.4.1 General . 4
5.4.2 Principles for input parameters value assignment for volumetric method . 4
5.4.3 Volumetric method for CBM resources . 5
5.4.4 E valuation method for CBM reserves . 6
5.5 Resource classification . 7
6 Compilation of resource evaluation reports . 8
6.1 Report requirements. 8
6.2 Report text outline . 8
6.3 Figures . 8
6.4 Tables . 8
Annex A (informative) Example of a CBM resource evaluation report outline .9
Bibliography .10
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ISO 4657:2021(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 263, Coalbed methane (CBM).
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INTERNATIONAL STANDARD ISO 4657:2021(E)
Assessment specification of coalbed methane resources
1 Scope
This document specifies the objectives, tasks, work processes, classification, report preparation and
acceptance of coalbed methane (CBM) resource evaluation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 18871:2015, Method of determining coalbed methane content
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
coalbed methane
CBM
methane-rich gas naturally occurring in coal seams (and surrounding rock) typically comprising of
80 % to 95 % methane with lower proportions of ethane, propane, nitrogen and carbon dioxide
Note 1 to entry: In common international use, this term refers to methane recovered from un-mined coal seams
using surface boreholes.
[SOURCE: ISO 18875:2015, 2.1]
3.2
CBM abundance
amount of hydrocarbons in unit area
[SOURCE: ISO 18875:2015, 2.28, modified — “resource” has been deleted from the term.]
3.3
CBM content
volume of hydrocarbon gas per unit mass of coal, usually expressed in cubic metre of gas per tonne of
coal under standard temperature and pressure (STP) conditions
3 3
Note 1 to entry: The unit is m /t or cm /g. STP conditions are 100 000 Pa and 0 °C (273,15 K).
[SOURCE: ISO 18875:2015, 2.5]
3.4
resource
all quantities of petroleum, recoverable and unrecoverable, that are estimated to exist originally
in naturally occurring accumulations, discovered and undiscovered, plus those quantities already
produced
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ISO 4657:2021(E)
3.5
reserves
those quantities of petroleum anticipated to be commercially recoverable by application of development
projects to known accumulations from a given date forward under defined conditions
4 General principles
4.1 Objective
The objective of the evaluation is to understand the distribution of CBM and the basic geological
characteristics of CBM reservoirs in the evaluation region, locate the CBM exploration targets, evaluate
the total amount, quality and certainty of CBM resources, lay a foundation for submitting a CBM
reserves report, and provide a basis for prospective planning of CBM exploration and development.
4.2 Basic requirements
4.2.1 The evaluation work shall be conducted and submitted independently.
4.2.2 The relevant data collected shall be reliable, representative and consistent. The data quality
shall meet the requirements of various professional specifications.
5 CBM resource evaluation workflow
5.1 General
The workflow of resource evaluation mainly includes data collection and collation, geological condition
analysis, evaluation method selection, input parameters value assignment, resource calculation, and
resource classification and conclusions.
5.2 Data collection and collation
5.2.1 Geophysical data
The interpretation results of gravitational, magnetic, electric and seismic data in the evaluation region
shall be fully used to analyse the characteristics of faults, stratum distribution and coal seam burial
depth, and to predict the control on CBM accumulation by faults, roof and floor conditions and the
variation trend of coalbed thickness.
5.2.2 Regional geological data
Regional geological data includes:
a) regional geographical data (including geographical location, topography, rivers, natural resources,
and major events such as earthquakes);
b) regional geological data and research achievements (including rocks, strata, structures, minerals,
crustal movement and development history);
c) hydrogeological survey data (including general status of groundwater resources; lithology and
distribution of aquifers; genesis, types, recharge and discharge conditions of groundwater;
distribution of water quality and quantity; division of hydrogeological units);
d) relevant information of extraction in the adjacent regions (including CBM resources, exploration
and development, dewatering and production, ground water extraction and gas production);
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ISO 4657:2021(E)
e) coalfield exploration reports and maps (including geological exploration reports compiled at
different exploration stages, final reports and maps);
f) coal mining data (including shaft development and mining design, mining roadway layout, shaft
reserves, production capacity and service life).
5.2.
...