SY/T 6489-2000 Specification for processing and interpretation of horizontal well logging data
Some standard content:
ICS 73.020
Registration No.: 8164-—2001Www.bzxZ.net
Petroleum and Natural Gas Industry Standard of the People's Republic of ChinaSY/T64892000
Specification for horizontal well log processing and interpretation2000-12-12 Issued
State Administration of Petroleum and Chemical Industry
2001-06-01Implementation
SY/T 6489—2000
Referenced Standards
Collecting Geological Data:
Characteristics and Quality Inspection of Horizontal Well Logging Data4
Processing Flow of Water Well Logging Data
Interpretation of Horizontal Well Logging Data
Interpretation Results
8 Interpretation Report
Appendix A (Appendix of the Standard)
Calculation Formula and Drawing Production of Horizontal Well Logging Track DataT
SY/T 6489—2000
Handling and interpretation of horizontal well logging data is different from interpretation of vertical well logging. It has a complete set of interpretation ideas and processing methods. In order to standardize the processing and interpretation of horizontal well logging data and ensure its quality, this standard is specially formulated. Appendix A of this standard is the appendix of the standard.
This standard is proposed by China National Petroleum Corporation. This standard is approved by the Petroleum Logging Professional Standardization Committee. Drafting Unit of this Standard: Shengli Petroleum Administration Bureau Logging Company. The main drafters of this standard are Meng Xiangshui and Mao Kening. 1 Scope
Petroleum and natural gas industry standard of the People's Republic of China Specification for horizontal well log processing and interpretation
SY/T 6489-2000
Specification for horizontal well log processing and interpretation interpretationThis standard specifies the basic contents, practices and requirements for processing and interpretation of horizontal well logging data. This standard is applicable to the processing and interpretation of horizontal well logging data. The interpretation of logging data of highly deviated wells can be referred to for implementation: 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard: When this standard is published, all versions are valid: All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards: SY7I5132—1997 Quality requirements for logging source data 3 Collection of geological data
3.1 Geological and geophysical data of oil fields
3.1.1 Geological exploration and development results maps, structural non-position maps, geological design bidding documents and geological exploration and development reports, etc.: 3.1.2 Previous logging data, interpretation results, application plates, formulas and standardized parameters adjacent to this well; 3.2 Primary data directly reflecting the situation of oil and gas layers; 3.2.1 Recording data: rock cuttings, gas logging, drilling time and other recording data. 3.2.2 Test the intermediate or adjacent oil and gas well sections and test the oil and gas wells (), test the water conditions: oil production, density and viscosity; production, composition: water production, salinity and water type: 4 Horizontal logging data characteristics and quality inspection 4.1 Horizontal logging data characteristics
For horizontal wells, if the measurement curve of the radial average logging instrument changes very quickly at a formation interface, it means that the angle between the wellbore and the formation is close to 0. If it changes slowly, it means that the angle between the wellbore and the formation is very small: 4.1.1 Dual-sensing curve
When the dual-sensing instrument passes through the formation interface at the bottom of the riser, the deep sensing curve and the medium sensing curve will show a "special angle" shape at the interface, which is due to the geometric factors of the sensing line diagram. Therefore, the angular response on the virtual logging curve is a good indicator of the formation interface.
4.1.2 Natural Gamma Curve
The natural gamma instrument is measured along the bottom of the well, and the following formations contribute greatly to the measured readings: The natural gamma curve is mainly the response value of the formation at the bottom of the well.
4.1.3 Density Curve
In a horizontal well, a mechanical device composed of a director and a rotary joint is used to make the measuring electrode of the density meter close to the bottom of the well, and the density output line is the most common component of the well: Sometimes, the low density value is caused by the electrode facing upward: 4.1.+ Compensated Neutron Curve
In a horizontal well, the instrument usually measures along the bottom of the well, and the line of the compensated neutron is mainly the response of the formation at the bottom of the well. State Administration of Petroleum and Chemical Industry 20-12-【2 Approved 200-06-41 Implementation
4.1.5 Formation dip curve
SY/T6489—2000
When the formation inclinometer passes through the formation interface along the wellbore, the formation dip curve can identify the position of the formation interface, the angle between the formation interface and the well axis, and the occurrence of the formation interface.
4.1.6 Logging curve characteristics in threaded wellbore Threaded wellbore is more common in horizontal wells. Its well diameter changes periodically, and the density, compensated neutron, microsphere focused resistivity, natural gamma, dual induction, eight lateral, high-resolution induction, and digital aggregation measurement values also change periodically. 4.1.7 Logging curve characteristics of cuttings wave
During the horizontal well drilling process, when the drilling fluid flow rate is not large enough, the cuttings will settle down and form some discontinuous small cuttings hills. The minimum value of the well diameter is equal to the item of each cuttings mound: the values of dual induction, eight lateral, natural gamma, compensated neutron, and density measurements also change in a wave-like manner, with different amplitudes and no periodicity.
4.2 Quality inspection of horizontal well logging data
The quality inspection of horizontal well logging data shall comply with the provisions of SY/T5132. 5 Horizontal well logging data processing flow
The processing of horizontal well logging data refers to the conversion of horizontal well logging data into wellbore trajectory information, see Appendix A (standard appendix) and 5.6, 5.7.
5.1 Depth correction. The depth correction of horizontal well logging data shall be carried out by the depth correction curve comparison method. Different measurements have a natural gamma curve. After the natural gamma curve is aligned, other curves move with the natural gamma curve. 5.2 According to the well inclination (spot measurement) and well inclination azimuth data provided by drilling, continuous well inclination and azimuth curves are drawn. 5.3 Calculate the east-west displacement, north-south displacement, vertical depth, horizontal displacement, and closure orientation. 5.4 Calculate the vertical depth correction curve, including the original logging curve and interpretation result curve of the vertical depth. 5.5 Calculate the mud content, effective porosity, oil saturation, and mineral volume content of the processed well section. 5.6 When the well inclination angle is greater than 45, draw the vertical section through the well axis of the horizontal displacement and the vertical section reservoir evaluation map. 5.7 When the well inclination angle is less than 45, draw the vertical section through the well axis of the vertical depth and the vertical section reservoir evaluation map. 5.8 Calculate the spatial relationship curve between the horizontal wellbore and the stratum it passes through. It can intuitively display the boundary of the unconformity surface of the stratum, the boundary and trend of the reservoir, as well as the oil-water interface, etc.
5.9 Draw the projection map of the wellbore trajectory in any two directions of the east-west direction, north-south direction, vertical direction, and horizontal direction. 5.10 Print the result data table.
6 Interpretation of horizontal well logging data
Horizontal well formation model and invasion model refer to the asymmetric anisotropic model of the medium around the wellbore. Horizontal well logging interpretation includes drawing horizontal wellbore trajectory, formation profile consultation and formation evaluation. 6.1 Analysis of horizontal wellbore trajectory
6.1.1 Predict background geological data. Based on seismic data and adjacent logging data, the geological structure, occurrence, lithology, physical properties and oil content of the designed and nearby layers are predicted. 6.1.2 Comparison of actual drilling wellbore trajectory data with predicted background geological data. Based on the predicted background formation data, the wellbore trajectory data is calculated, so that the location of the wellbore in the target layer can be determined for the evaluation of oil, gas and water. 6.1.3 Use the wellbore trajectory data to calibrate the predicted background geological data. When there is an error between the predicted data and the actual drilling data, or even if the actual drilling wellbore trajectory is completely consistent with the designed wellbore trajectory, the expected geological effect cannot be achieved, the predicted background geological data is corrected with the horizontal well logging data to eliminate the prediction error and obtain accurate background geological data. 6.2 Stratigraphic profile consultation
According to the characteristics of the logging data, it is explained whether the wellbore is in the target reservoir, its position in the target layer, whether the target point is hit, and how to drill in the next step. The results are helpful and guiding for horizontal well drilling and other horizontal well construction processes. —2
6.2.1A target consultation
SY/T6489—2000
Input the well inclination, azimuth and conventional logging data measured by the continuous inclinometer into the program to calculate the actual drilling trajectory and vertical depth curve of target A: Then use the vertical depth curve to determine the intersection coordinates (horizontal displacement, vertical depth) of the wellbore and the top interface of the target layer. Combined with the top boundary data of the target layer determined by seismic data, the top boundary data of the target layer of the logging scale and the distance from the well axis to the top and bottom boundaries of the target layer can be obtained. 6.2.2B Target Consultation
After completion logging of the horizontal section of the wellbore (from target A to target B), determine whether the wellbore is in the target layer and the position of each point on the well axis in the target layer; determine the lithology, physical properties and oil content of the formation and its changes along the horizontal section of the wellbore. 6.3 Horizontal Well Formation Evaluation
Analyze the lithology, physical properties and oil content of the target reservoir and their changes along the wellbore; for fractured formations, determine the situation of the wellbore passing through the fracture.
6.3.1 Calculation of Reservoir Parameters
The horizontal well logging data that has been depth-corrected and environmentally-corrected reflects the logging data of the original formation characteristics, and the calculation method of reservoir parameters in vertical wells can be used.
6.3.2 Evaluation of oil, gas and water layers
6.3.2.1 Conventional analysis
a) Comprehensive analysis of well logging, mud logging and adjacent well logging data; b) Determine the lithology and porosity of the formation based on natural gamma and compensated neutron, density and acoustic wave porosity curves; c) Determine the permeability of the reservoir based on the natural potential and the difference between the three resistivities of deep, medium and shallow; d) Determine the oil content of the reservoir based on the absolute and relative values of the three resistivities of deep, medium and shallow; e) Determine the production properties of the reservoir based on the movable water analysis method and divide the oil, gas and water layers; f) For fractured formations, judge the development of reservoir fractures based on logging data such as the difference between deep and shallow detection resistivities and the relative high and low measured values.
6.3.2.2 Comprehensive analysis
Comprehensively analyze the logging data, well trajectory data and predicted background geological data to give a reasonable interpretation conclusion. 7 Interpretation results
7.1 Vertical depth curve.
7.2 Vertical profile through the well axis
7.3 Reservoir evaluation diagram through the vertical plane of the well axis.
7.4 Horizontal projection of well trajectory.
7.5 Data results table.
8 Interpretation report
8.1 Geological background.
8.2 Logging content.
8.3 Target evaluation results.
SY/T 6489—2000
Appendix A
(Appendix to the standard)
Calculation formulas and drawing preparation for horizontal wellbore trajectory dataA1 Calculation formulas for horizontal wellbore trajectory dataA1.1 Calculation of horizontal wellbore trajectory data
A1.1.1 Calculation of vertical depth is shown in formula (A1)Le - I.
(sing, - sinB.)
2, - 21 =
Wherein: Z., 2——the vertical depths of points α and b in the horizontal well section, m; L,, L,-—the measured depths of points α and 6 in the horizontal well section, m. m;8.. -
3, 3—
are the well inclination angles of the horizontal segment at two points, (\): are the well inclination azimuths of the horizontal segment at two points (°) 41.1.2 The calculation of the east-west displacement is shown in formula (A2): (L, - L(cossa - cosbh)(cospaX-X=
( -)( )
Formula ++ XX
are the east and west displacements of the horizontal segment α, two points, m.cos
A1.1.3 The calculation of the north-south displacement is shown in formula (3): Y - Y, - (L- L(ana-_ a)(sing. - sine)(88(3,P.)
Formula: Y.. Y.-
- is the south-to-north displacement of two points in the horizontal well section α, 6 respectively, m.(A)
A1.1.4 The calculation of the north-south displacement, east-west displacement and vertical depth at the "th sampling point" is shown in formula (A4), formula (A5) and formula (A6): ten
In the formula: -
In the formula: z-the east-west displacement at the
th sampling point, m
the north-south displacement at the nth sampling point. m>
-the multiplied vertical depth at the nth sampling point, m: (x
A1.1.5 The calculation of the horizontal displacement at the nth sampling point is shown in formula (A7): S-Vry
In the formula: S-the horizontal displacement at the nth sampling point, mA1.1.6 The calculation of the closed orientation at the nth sampling point is shown in formula (A8): arcig
Wu Zhong: α-the nth The closing position at each sampling point is (\). A1.2 Calculate the cross-axis cross-section curve - (A4)
- (A6)
Draw the required line of the cross-axis vertical cross-section of the 45°~ well section, which is the cross-axis curve, vertical depth curve and drill bit trajectory indexed by horizontal displacement:
A1.2.1 The calculation of the cross-axis is shown in formula (A9): Cross-axis, m;
Where: HSM-
ZD Vertical depth, m
SY/T 6489—2000
HSM = ZD
A1.2.2 The actual highest busbar of the parallel tube is calculated by formula (A10): HSCAR = ZD - A(0.SCAL)
Wherein HSCAR
-the highest busbar of the parallel tube, m:
CAL parallel diameter, m;
The proportional constant of the parallel tube on the vertical section through the parallel axis A1.2.3 The actual lowest busbar of the well tube is calculated by formula (A11): HSCAL = ZD) + A(0.5CAL)
Wherein: HSCAL the lowest busbar of the well tube, m
A1.2.4 The nominal highest busbar of the parallel tube is calculated by formula (A12): HSHSR = ZD - A(0.5BS)
Wherein: HSRSR-
-highest generatrix of nominal well casing, m;
BS--bit size, m.
A1.2.5 Calculation of the lowest generatrix of nominal well casing is shown in the formula: (A13); HSHSL =Z)+A(0.5BS)
Wherein: HSHSL is the lowest generatrix of nominal well casing, m. (A9)
-(A10)
Draw the curve on the vertical section of the well casing through the parallel axis of the 0°～45\ section, which refers to the parallel diameter curve and horizontal displacement curve indexed by vertical depth: In the formula (A13), ZD should be replaced by HCFF (HO)FF refers to horizontal displacement). A1.3 Calculation of the curve on the reservoir evaluation diagram of the vertical section through the well axis A1.3.1 Calculation of the axis of the well column is shown in formula (A14): HSM' = ZD
Where: HSM'-
well column axis, mo
A1.3.2 Calculation of the nominal highest generatrix of the well column is shown in formula (A15): HSLTR = ZD - B(0.5)
Where: HSLIR—
nominal highest generatrix of the well column, m:
B—proportional constant of the well column in the reservoir evaluation diagram of the vertical section through the well column: A1.3.3 Calculation of the nominal lowest generatrix of the well column is shown in formula (A16): HSLTL = ZD + B(0.5)
Where: HSLTL—nominal lowest generatrix of the well column, m: A1.3.4 Calculation of the shale content plot line is shown in formula (A17): HSSH - HSLTT - B(SH)
Wherein, HSSH—
--shale content plot line, %;
--shale content, %.
A1.3.5Calculation of sandstone content plot line is shown in formula (A18): HSSAND = HSSH - B(SAND)
Wherein: HSSAND-
Sandstone content plot line, %;
Sandstone bottom content, %
A1.3.6Calculation of pore volume line containing residual oil is shown in formula (A19): HS+yo - HSSAND -- B(+no)
Wherein: HS#-
--pore volume line containing residual oil, %;
.(A14)
.·(A16)
--residual oil volume content, %.
SY/T 6489--2000
A1.3.7 The calculation of the pore volume line containing movable oil is shown in formula (A20): HSdM = HSPn) - H(Mo)
Wherein: HS Chong - pore volume line containing movable oil, %: - movable oil volume content, %.
A1.3.8 The calculation of the pore volume line containing water is shown in formula (A21): HSPw - HSPMO - B(pw)
Wherein: ISw-…·- pore volume line containing water, %Φw - water-containing porosity, %.
A2 Preparation of wellbore trajectory map of horizontal wells
Two types of data are required for horizontal and vertical well trajectory consultation: background geological data and wellbore trajectory data. A2.1 Standard film tube
simultaneously contains the wellbore trajectory information, the structure and occurrence information of the target layer, and the lithology, physical properties, and oil and gas content of the target layer. A2.1.1 Preparation of standard parallel tube
Select the vertical section through the well axis as the projection surface, project the wellbore trajectory data and the logging scale background geological data onto this projection surface, and draw the standard parallel tube and the vertical section diagram of the formation through the well axis. A2.1.2 Composition of standard parallel tube
The ordinate is the vertical depth, and the abscissa is the horizontal displacement. The structure and occurrence of the target layer are represented by the upper and lower boundaries of the target layer; the wellbore trajectory is represented by the wellbore axis; the lithology, physical properties and mineralization of the target layer and their subtle changes are represented by the reservoir evaluation map with the highest and lowest generatrix of the nominal wellbore (well diameter equal to the drill bit diameter) as the boundary line; the geometric shape of the parallel tube is represented by the highest and lowest generatrix of the actual wellbore. A2.2 Preparation of vertical section diagram through the well axis
The geometric shape of the parallel tube on the vertical section diagram of the formation through the well axis in the standard wellbore is retained, and the highest and lowest generatrix of the actual parallel tube show the change of the diameter.
A2.3 Preparation of vertical section reservoir evaluation map through the lifting axis The part reflecting the optical, physical and oil-bearing properties of the target layer on the vertical section map through the well axis in the standard well chart is retained:
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