SY/T 5579.1-2024 Reservoir description method Part 1 : General provisions English, Anglais, Englisch, Inglés, えいご
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ICS
E
Professional standard of the People's Republic of China
SY/T 5579.1-2024
Replaces SY/T 5579.1-2008
Reservoir description method Part 1: General provisions
油藏描述方法 第1部分：总则
(English Translation)
Issue date: 2024-12-25 Implementation date: 2025-06-25
Issued by National Development and Reform Commission, P.R.C
Contents
Foreword
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Division and Tasks of Reservoir Description Stages
4.1 Division of Reservoir Description Stages
4.2 Tasks of Reservoir Description at Each Stage
5 Basic Data for Reservoir Description and Quality Control
5.1 Basic Data
5.2 Quality Control
6 Main Content of Reservoir Description
6.1 Description of Regional Geological Characteristics
6.2 Stratigraphic Division and Correlation
6.3 Structural Description
6.4 Reservoir Description
6.5 Fluid Description
6.6 Reservoir Characteristics
6.7 Establishment of 3D Geological Model
7 Accuracy Requirements for Each Stage of Reservoir Description
7.1 Reservoir Evaluation Stage
7.2 Initial Development Stage
7.3 Mid-Late Development Stage
8 Result Maps and Electronic Documents
Annex A (Normative) Determination of Original Oil-Gas and Oil-Water Contacts in Reservoirs Controlled Mainly by Structural Factors
A.1 Data Acquisition and Description
A.2 Oil-Gas and Oil-Water Contacts
Annex B (Normative) Methods for Determining Original Formation Pressure and Pressure System of Oil and Gas Reservoirs
B.1 Requirements for Acquired Data to Determine Original Formation Pressure and Pressure System of Oil and Gas Reservoirs
B.2 Determination of Single-Well Original Formation Pressure
B.3 Determination of Reservoir Pressure System
B.4 Determination of Reservoir Original Formation Pressure
B.5 Determination of Reservoir Pressure Coefficient
Annex C (Informative) Relevant Formulas for Calculating Natural Energy in Natural Water Drive Reservoirs
C.1 Formula for Calculating Natural Water Influx in Reservoirs using Steady-State Flow Method
C.2 Formula for Calculating Natural Water Influx in Reservoirs using Unsteady-State Flow Method
Annex D (Informative) Relevant Formulas for Calculating Natural Energy in Elastic Drive Reservoirs
Annex E (Informative) Relevant Formulas for Calculating Natural Energy in Gravity Drive Reservoirs
Annex F (Informative) Relevant Formulas for Calculating Natural Energy in Combination Drive Reservoirs
F.1 Formula for Calculating Drive Indices in Undersaturated Reservoirs
F.2 Formula for Calculating Drive Indices in Saturated Reservoirs
Annex G (Normative) Compilation of Result Maps and Electronic Documents
G.1 Written Report
G.2 Maps
G.3 Tables
G.4 Result Data Volume
G.5 Database
Bibliography
Reservoir Description Method - Part 1: General Principles
1 Scope
This document specifies the phase division and tasks, technical data, main content, and technical requirements applicable to various types of reservoir description.
This document is applicable to the description of clastic rock reservoirs, carbonate rock reservoirs, special lithology reservoirs, and tight sandstone reservoirs. Other reservoir types may refer to this document for use.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 8423.1 Petroleum and natural gas industries terminology – Part 1: Exploration and development
DZ/T 0217 Specification for estimation of oil and natural gas reserves
DZ/T 0252 Specification for estimation of offshore oil and natural gas reserves
SY/T 5615 Specification for petroleum geology mapping and legends
SY/T 6169 Reservoir classification
SY/T 6580 Commonly used quantities and units in petroleum exploration and development
SY/T 7378 Technical specification for establishing 3D quantitative geological model of oil and gas reservoirs
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 8423.1 and the following apply.
3.1
reservoir description
A development geology research process that qualitatively and quantitatively describes reservoir parameters and establishes a three-dimensional geological model reflecting characteristics such as reservoir stratigraphy, structure, reservoir properties, fluids, and temperature-pressure system.
3.2
facies
The sum of characteristics of rocks formed in a specific environment.
Note: Includes sedimentary facies, diagenetic facies, lithofacies, etc.
3.3
reservoir heterogeneity
The property of reservoir characteristics varying with spatial location.
[Source: GB/T 8423.1-2018, 4.1.8]
3.4
comprehensive evaluation of reservoir
Based on the study of reservoir heterogeneity, a classification evaluation of different levels of oil-bearing reservoir units within each oil-bearing series.
3.5
reservoir geological model
Digitization and visual quantitative characterization of the distribution and variation of reservoir geological characteristics in three-dimensional space.
4 Division and Tasks of Reservoir Description Stages
4.1 Division of Reservoir Description Stages
The reservoir description stages are divided into the reservoir evaluation stage, the initial development stage, and the mid-late development stage.
4.2 Tasks of Reservoir Description at Each Stage
4.2.1 Reservoir Evaluation Stage
From the discovery of the oilfield to the implementation of the development plan, using seismic data and data from all exploration wells and appraisal wells (core, logging, testing, production test data, etc.), describe the structural form, reservoir type, and fluid properties, determine the reservoir type, and establish a reservoir geological model. This provides a data foundation for submitting proved reserves and formulating a development plan.
4.2.2 Initial Development Stage
After the implementation of the oilfield development plan, use seismic data, data from all exploration wells, appraisal wells, development wells, core analysis, logging, production testing, trial production, pilot tests, etc., to re-understand the reservoir geology. Revise the reservoir structural form, fault system, reservoir facies type and lithology, physical properties, structural characteristics, fluid properties, and distribution patterns. Clarify the laws of oil and gas enrichment, update the reservoir geological model, and provide a basis for optimizing development technical policies.
4.2.3 Mid-Late Development Stage
After the oilfield enters development adjustment or a high water-cut period, use all static and dynamic data to conduct microstructure research, flow unit division, and small-scale inter-well parameter prediction. Further predict the heterogeneity of genetic units within various inter-well reservoir bodies and their three-dimensional spatial distribution patterns. Provide current-stage understanding and evaluation of geological characteristics such as structure, reservoir, fluid properties, and remaining oil distribution. Update the reservoir geological model and indicate potential directions for enhanced oil recovery.
5 Basic Data for Reservoir Description and Quality Control
5.1 Basic Data
5.1.1 Geological Data
Includes data on regional geology, structural characteristics, stratigraphic characteristics, reservoir formation, etc.
5.1.2 Seismic Data
Includes 2D seismic, 3D seismic, and Vertical Seismic Profiling (VSP) data.
5.1.3 Mud Logging Data
Includes core logging, sidewall coring, drilling time logging, cuttings logging, fluorescence logging, drilling fluid logging, gas logging, and various geochemical logging data.
5.1.4 Well Logging Data
According to the tasks and requirements of the reservoir description stage and targeting the geological characteristics of the specific oilfield, select conventional logging data reflecting lithology, typical characteristics, physical properties, etc., and special logging data such as imaging and nuclear magnetic resonance.
5.1.5 Well Testing, Production Test, Injection Test, and Well Test Data
Well testing data includes productivity, reservoir parameters, and fluid property data. Production test data includes production rates, reservoir parameters, and fluid property data. Injection test data includes injectivity data. Well test data includes productivity, injectivity, reservoir parameters, etc.
.1.6 Production Performance Data
Includes measurement data such as daily oil production, water cut, gas-oil ratio, and wellhead pressure.
5.1.7 Dynamic Monitoring Data
Includes pressure data, injection profile data, production profile data, saturation logging data, etc.
5.2 Quality Control
5.2.1 Quality Control Requirements
Correct and screen data with reference to quality control records during the data acquisition process. When necessary, determine correction and screening principles through comprehensive analysis and comparison of different types of data.
5.2.2 Quality Control of Static Data
Typically includes eliminating outliers, depth correction of sample points, closure checks of seismic data, and standardization and normalization of well log curves.
5.2.3 Quality Control of Dynamic Data
Typically includes eliminating outliers, cross-validation of pressure gradients and fluid densities.
6 Main Content of Reservoir Description
6.1 Description of Regional Geological Characteristics
Investigate or apply exploration research results to describe the regional tectonic background, reservoir formation conditions, etc., forming an understanding of the regional geological overview.
6.2 Stratigraphic Division and Correlation
6.2.1 Regional Stratigraphic Division and Correlation
Based on key wells, carry out regional stratigraphic division to form a complete comprehensive stratigraphic column, and conduct inter-well stratigraphic correlation to establish an isochronous stratigraphic framework.
6.2.2 Fine Stratigraphic Division and Correlation
