CN114687725A - Identification method for cardiac beach scale - Google Patents
Identification method for cardiac beach scale Download PDFInfo
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- CN114687725A CN114687725A CN202011590411.2A CN202011590411A CN114687725A CN 114687725 A CN114687725 A CN 114687725A CN 202011590411 A CN202011590411 A CN 202011590411A CN 114687725 A CN114687725 A CN 114687725A
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- 230000000747 cardiac effect Effects 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims description 20
- 229930195733 hydrocarbon Natural products 0.000 claims description 14
- 150000002430 hydrocarbons Chemical class 0.000 claims description 14
- 239000004215 Carbon black (E152) Substances 0.000 claims description 13
- 239000011324 bead Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 210000003484 anatomy Anatomy 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a method for identifying the scale of a cardiac beach, and belongs to the technical field of gas field development and research. The method analyzes the trend of the river channel through the logging and logging information of the existing straight well and pilot hole well in the target area, then establishes the corresponding relation between the heart beach and the logging and logging according to the existing logging and logging information, analyzes the part of the horizontal section drill meeting the heart beach, and analyzes the development scale of the heart beach by utilizing the real drilling and logging information of the horizontal section. The method solves the problem that the difficulty in accurately describing the spreading of the cardiac beach is high due to small well pattern density and low geophysical prospecting precision, improves the scale prediction precision of the cardiac beach, and provides guarantee for improving the success rate of adjusting the well position arrangement.
Description
Technical Field
The invention relates to a method for identifying the scale of a cardiac beach, and belongs to the technical field of gas field development and research.
Background
Along with the continuous promotion of the development degree of the gas field, the development degree of the gas field is higher and higher, the geological conditions of the rest undeveloped areas are gradually worsened, particularly in the development of a river-phase compact sandstone gas reservoir, the reservoir has the characteristics of quick longitudinal and transverse change of sand bodies, large difference of physical properties and gas content of the reservoir, strong heterogeneity and the like, the yield of the encryption well is gradually reduced, the encryption adjusting effect is gradually reduced, and the efficient adjustment of the gas field cannot be met. And accurate identification of the size of the cardiac beach is helpful for effective identification of reservoir distribution rules.
The patent application publication No. CN110442906A discloses a quantitative characterization method for cardiac flat surface shape parameters, but the scheme aims at the known cardiac state of the cardiac flat, divides the cardiac flat boundary into 1-n (x, y) coordinate points in the form of coordinate system, and then defines the cardiac flat boundary parameters by the coordinate points.
Disclosure of Invention
The invention aims to provide a method for identifying the scale of a cardiac beach, which aims to solve the problems of high difficulty and low precision of the conventional cardiac beach scale identification.
The present invention provides a method for identifying the size of a cardiac beach to solve the above technical problems, the method comprising the steps of:
1) acquiring logging information and logging information of existing vertical wells and pilot wells in a target area, wherein the logging information comprises lithology, a while-drilling all-hydrocarbon value and a while-drilling gamma value, and the logging data comprises natural gamma logging data and acoustic wave data;
2) determining the extending direction of the river channel sand body in the target area according to the acquired logging and logging information of the existing straight well and pilot hole well in the target area;
3) establishing a corresponding relation between a cardiac beach and logging information according to the logging information of existing straight wells and pilot wells in a target area;
4) and in the determined extending direction of the river channel sand body, determining the size of the cardiac beach according to horizontal well logging information and logging information by establishing the corresponding relation between the cardiac beach and the logging information.
The method analyzes the trend of the river channel through the logging and logging information of the existing straight well and pilot hole well in the target area, then establishes the corresponding relation between the heart beach and the logging and logging according to the existing logging and logging information, analyzes the part of the horizontal section drill meeting the heart beach, and analyzes the development scale of the heart beach by utilizing the real drilling and logging information of the horizontal section. The method solves the problem that the difficulty in accurately describing the spreading of the cardiac beach is high due to small well pattern density and low geophysical prospecting precision, improves the scale prediction precision of the cardiac beach, and provides guarantee for improving the success rate of adjusting the well position arrangement.
Further, the process of determining the extending direction of the river channel sand body in the step 2) is as follows:
analyzing and determining lithology and logging response characteristics of different sedimentary microfacies according to logging information and logging information of existing vertical wells and pilot hole wells in a target area, and determining logging typical curve characteristics corresponding to different lithologies to obtain the plane distribution of the sand body of a target layer;
and determining the extension direction of the river sand body by a bead stringing method according to the characteristic of the well logging typical curve.
Further, the typical curve characteristics of the well log corresponding to different lithologies are as follows: and when the lithology is judged, the sandstone is in a low natural gamma curve form, the natural gamma is less than 100API, the mudstone is in a high natural gamma curve form, and the natural gamma is more than 100 API.
Further, the relationship between the cardiac beach and the logging data and logging data established in step 3) is as follows:
the high-energy heart shoal lithology is pure and coarse in granularity, a logging curve is smooth-microtooth box-shaped low natural gamma, medium and high sound waves, and total hydrocarbon is more than 15%; the low-energy heart beach lithology is sandstone with medium and fine granularity, a natural gamma curve is in a tooth box shape, and total hydrocarbon is 5-15%; the riverway filling lithology is fine siltstone or mudstone, a natural gamma curve is in a high-amplitude tooth-like box shape or a bell shape, and the total hydrocarbon is less than 5 percent.
Further, the process of determining the size of the cardiac beach according to the logging data of the horizontal well and the logging data in the step 4) comprises the following steps:
analyzing the extension length of the single cardiac beach according to the lithology of the horizontal section real drilling, logging total hydrocarbons and a gamma curve while drilling, and analyzing the width of the single cardiac beach according to the data of the real drilling logging and logging of the existing straight well or pilot hole well and the width-thickness ratio and the length-width ratio of the single cardiac beach to obtain the development scale of the single cardiac beach.
Drawings
FIG. 1 is a flow chart of a cardiac beach size identification method of the present invention;
FIG. 2 is a diagram of the identified cardiac beach versus log well in an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a cardiac beach gauge using horizontal segment data description according to an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The method analyzes the trend of the river channel through the logging and logging information of the existing straight well and pilot hole well in the target area, then establishes the corresponding relation between the heart beach and the logging and logging according to the existing logging and logging information, analyzes the part of the horizontal section drill meeting the heart beach, and analyzes the development scale of the heart beach by utilizing the real drilling and logging information of the horizontal section. The implementation flow of the method is shown in fig. 1, and the specific implementation process is as follows.
1. And acquiring logging and logging information of existing vertical wells and pilot wells in the target area.
In this embodiment, the logging data includes lithology, hydrocarbon while drilling value, and gamma while drilling value, and the logging data includes GR (natural gamma) logging data and acoustic data.
2. And determining the extending direction of the river sand body in the target area according to the acquired logging and logging information of the existing vertical well and pilot hole well in the target area.
And analyzing lithology and logging response characteristics of different sedimentary microfacies according to logging and logging information of existing straight wells and pilot wells in a target area, determining typical logging curve characteristics corresponding to different lithologies, obtaining plane distribution of the sand body of the target layer, and analyzing the extension direction of the sand body of the river channel by a bead string method according to the typical curve characteristics. Sandstone is characterized by low gamma, and river channel sand bodies have continuity, wells with low gamma values are connected in series to form a beading method, and the extension direction of the river channel sand bodies can be determined according to the beading method. The logging typical curve characteristics corresponding to different lithologies obtained in the implementation are as follows: and when the lithology is judged, the sandstone is in a low gamma curve form, the gamma is less than 100API, the mudstone is in a high gamma curve form, and the gamma is more than 100 API.
3. And establishing the corresponding relation between the cardiac beach and the well logging and logging according to the well logging and logging information of the existing straight well and pilot hole well in the target area.
The logging and logging corresponding relation obtained in the implementation is as follows:
the high-energy heart shoal has pure lithology and coarse granularity, the logging curve is characterized by low gamma of a smooth-microtooth box shape, medium and high sound waves, full hydrocarbon and the like, and the full hydrocarbon is more than 15 percent; the low-energy heart beach lithology is sandstone with medium and fine granularity, a gamma curve is in a tooth box shape, the total hydrocarbon is low, generally 5-15%, and the height is uneven; the lithology of the riverway filling is fine siltstone or mudstone, the gamma curve is in a high-amplitude tooth-shaped box shape or a bell shape, and the total hydrocarbon display is low, generally less than 5 percent, as shown in figure 2.
4. In the extending direction of the river channel sand body, the extending length of the single cardiac beach is determined according to the horizontal well logging information and the well logging information, and the width of the single cardiac beach is determined according to the width-thickness ratio and the length-width ratio of the single cardiac beach, so that the development scale of the single cardiac beach is obtained.
Along the river channel direction, the beaches have pure lithology, coarse granularity, low gamma and high gas logging value, while the beaches have tail lithology which is generally fine-siltstone, relatively high gamma and low gas logging value. In the embodiment, in the extending direction of the river sand body determined in the step 2, the position of the horizontal section drill meeting the river and the heart beach is judged according to the real drilling and logging lithology of the horizontal well, the single heart beach extending length is analyzed according to the real drilling lithology of the horizontal section, the logging total hydrocarbon and the gamma curve while drilling, then the single heart beach width is analyzed according to the existing vertical well or pilot hole real drilling logging and logging information and the single heart beach width through the length-width ratio of the heart beach, and therefore the single heart beach development scale is obtained.
When the scale of the cardiac beach is described, if a vertical well, a pilot hole well or a horizontal well drill meets the boundary, the boundary of the single-stage river channel sand body is described according to well position data, and if no vertical well or pilot hole well drill meets the boundary, the boundary is described according to the width-thickness ratio of the single-stage river channel sand body.
In the embodiment, on the basis of dense well network anatomy, the length of a single heart beach is 150-.
Claims (5)
1. A method for identifying the size of a cardiac beach is characterized by comprising the following steps:
1) acquiring logging information and logging information of existing vertical wells and pilot wells in a target area, wherein the logging information comprises lithology, a while-drilling all-hydrocarbon value and a while-drilling gamma value, and the logging data comprises natural gamma logging data and acoustic wave data;
2) determining the extending direction of the river channel sand body in the target area according to the acquired logging and logging information of the existing straight well and pilot hole well in the target area;
3) establishing a corresponding relation between a cardiac beach and logging information according to the logging information of existing straight wells and pilot wells in a target area;
4) and in the determined extending direction of the river channel sand body, determining the size of the cardiac beach according to horizontal well logging information and logging information by establishing the corresponding relation between the cardiac beach and the logging information.
2. The method for identifying the size of the cardiac beach of claim 1, wherein the determination of the extending direction of the river course sand in step 2) is as follows:
analyzing and determining lithology and logging response characteristics of different sedimentary microfacies according to logging information and logging information of existing straight wells and pilot wells in a target area, and determining typical logging curve characteristics corresponding to different lithologies to obtain the plane distribution of the sand body of a target layer;
and determining the extension direction of the river sand body by a bead stringing method according to the characteristic of the well logging typical curve.
3. The method of claim 2, wherein the log profile corresponding to different lithologies is characterized by: and when the lithology is judged, the sandstone is in a low natural gamma curve form, the natural gamma is less than 100API, the mudstone is in a high natural gamma curve form, and the natural gamma is more than 100 API.
4. The method for identifying the size of the cardiac beach of claim 1, wherein the corresponding relationship between the cardiac beach and the logging data established in step 3) is as follows:
the high-energy cardiac beach lithology is pure and coarse in granularity, the logging curve is smooth-microtooth box-shaped low natural gamma, medium-high sound waves and total hydrocarbons are more than 15%; the low-energy heart beach lithology is sandstone with medium and fine granularity, a natural gamma curve is in a tooth box shape, and total hydrocarbon is 5-15%; the riverway filling lithology is fine siltstone or mudstone, a natural gamma curve is in a high-amplitude tooth-like box shape or a bell shape, and the total hydrocarbon is less than 5 percent.
5. The method for identifying the size of the cardiac beach according to claim 1, wherein the step 4) of determining the size of the cardiac beach according to the horizontal well logging data and the well logging data comprises the following steps:
analyzing the extension length of the single cardiac beach according to the lithology of the horizontal section real drilling, logging total hydrocarbons and a gamma curve while drilling, and analyzing the width of the single cardiac beach according to the data of the real drilling logging and logging of the existing straight well or pilot hole well and the width-thickness ratio and the length-width ratio of the single cardiac beach to obtain the development scale of the single cardiac beach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011590411.2A CN114687725A (en) | 2020-12-29 | 2020-12-29 | Identification method for cardiac beach scale |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011590411.2A CN114687725A (en) | 2020-12-29 | 2020-12-29 | Identification method for cardiac beach scale |
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| CN114687725A true CN114687725A (en) | 2022-07-01 |
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| CN202011590411.2A Pending CN114687725A (en) | 2020-12-29 | 2020-12-29 | Identification method for cardiac beach scale |
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- 2020-12-29 CN CN202011590411.2A patent/CN114687725A/en active Pending
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