CN110045431A - A kind of new marine deposit stratum ancient landform bearing calibration based on gamma data body - Google Patents
A kind of new marine deposit stratum ancient landform bearing calibration based on gamma data body Download PDFInfo
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Abstract
The present invention relates to a kind of new marine deposit stratum ancient landform bearing calibrations based on gamma data body, it is under the jurisdiction of exploration of oil and gas field technical field, this method first calculates the ancient landform data (being denoted as two-dimensional array P) of interval of interest using conventional ancient landform analysis method, the GR data volume in research area is calculated using conventional post-stack inversion method again, and extract the GR data (being denoted as two-dimensional array G) of interval of interest, finally (GR value is bigger for the positive correlation based on GR value in marine depositional environment and ancient landform buried depth, palaeogeomorphic buried depth is deeper), use GR weight coefficient value (the GR value of current sample with put centered on the point rectangle when window in all sampling points GR average value ratio) bearing calibration is corrected ancient landform array P, obtain more accurate ancient landform data, effectively overcome conventional ancient landform analysis side The inaccurate defect of method paleogeographic reconstruction.
Description
Technical field
The present invention relates to exploration of oil and gas field technical fields, more particularly to a kind of new marine facies based on gamma (GR) data volume
Sedimentary formation ancient landform bearing calibration.
Background technique
Ancient landform is one of the principal element for controlling basin fill and mutually developing with being distributed, and it is heavy to control to a certain extent
The type and spread, the formation of sequence and development, the distribution of High-quality Reservoir and oil reservoir of product system, therefore restore ancient landform before depositing
And fine ancient landform research has important directive significance for oil-gas exploration.
Currently, a variety of palaeogeomorphologies have been developed both at home and abroad, such as impression method, residual thickness method, sequence
Layer method, sedimentology method etc. are all widely used in paleogeographic reconstruction job applications.The above palaeogeomorphology has had
Many researchs and application achievements, but equal existing defects, as residual thickness method does not consider landform before depositing and degrades the shadow of difference
It rings, is controlled by material point；Impression method is not easy to determine datum level, and compacted formation correction is difficult；Sequence stratigraphy method is rough, it is qualitative and
It is difficult meticulous depiction；Sedimentology method influence factor is more, rough, qualitative and be not easy meticulous depiction geomorphic unit etc..Therefore it is used only
The above method has been difficult to meet the precision needs of present paleogeographic reconstruction.
For marine deposit subterranean formation zone, the present invention proposes a kind of new bearing calibration, based on GR in marine depositional environment
It is worth and ancient landform value is calculated to conventional method with the positive correlation (GR value is bigger, and palaeogeomorphic buried depth is deeper) of ancient landform buried depth
It is corrected.The theoretical basis of this correction: because the flow direction and the depth of water of paleocurrent all affect the distribution and content of shale, water
Deeper, hydrodynamic force is smaller, and shale is easier to be deposited, and therefore, on the marine deposit stratum more than shale content, topography is lower,
Its ancient landform buried depth is deeper.Therefore, ancient landform is corrected using GR weight coefficient value correcting method, it is more accurate to obtain
Ancient landform data, the defect for effectively overcoming conventional ancient landform analysis method paleogeographic reconstruction inaccurate, for the geology item from now on
Paleogeographic reconstruction work provides important reference under part.
Summary of the invention
The purpose of the present invention is being directed to the paleogeographic reconstruction on marine deposit stratum, based on GR value in marine depositional environment with
The positive correlation of ancient landform buried depth provides a kind of new marine deposit stratum ancient landform bearing calibration based on GR data volume,
Using the defect that the present invention can effectively overcome conventional ancient landform analysis method paleogeographic reconstruction inaccurate, paleogeographic reconstruction is improved
Precision.
Specific steps of the invention include:
(1) the ancient landform data (being denoted as two-dimensional array P) of interval of interest are calculated using conventional ancient landform analysis method.
(2) the GR data volume in research area is calculated using conventional post-stack inversion method, and extracts the GR data of interval of interest
(being denoted as two-dimensional array G).
(3) (GR value is bigger, palaeogeomorphic buried depth for the positive correlation based on GR value in marine depositional environment and ancient landform buried depth
It is deeper), using GR weight coefficient value, (GR of all sampling points is flat in window when the GR value of current sample and the rectangle put centered on the point
The ratio of mean value) bearing calibration is corrected ancient landform array P.
The present invention is a kind of new marine deposit stratum ancient landform bearing calibration based on GR data volume, is had following special
Point, is mainly shown as:
(1) present invention is under the jurisdiction of petroleum exploration field, but inventor introduces " sea from the knowledge in petroleum geology field
The positive correlation (GR value is bigger, and palaeogeomorphic buried depth is deeper) of GR value and ancient landform buried depth in phase depositional environment ", using GR data
Body constrains marine deposit stratum paleogeographic reconstruction, improves computational accuracy and reliability.
(2) document published at present, conventional ancient landform analysis is all without reference to using seismic properties (or parameter)
It is corrected, the present invention uses GR data volume to be corrected ancient landform for the first time, has stronger novelty.
Specific embodiment
A kind of new marine deposit stratum ancient landform correction based on gamma (GR) data volume provided in an embodiment of the present invention
Method is described in detail the present invention below with reference to embodiment.
Specific step is as follows by the present invention:
(1) the ancient landform data that interval of interest is calculated using conventional ancient landform analysis method, by interval of interest ancient landform
Data are denoted as two-dimensional array P, and (line number of array P is to study total survey line number N_Line in area, and the columns of numerical value P is research area
Total road number N_CDP of single survey line), conventional ancient landform analysis method can be used according to the practical geologic setting in research area
Such as the methods of residual thickness method, impression method, sequence stratigraphy method, and obtain the ancient landform thickness plane figure of interval of interest.
(2) the GR data volume in research area is calculated using conventional post-stack inversion method, and extracts the GR data of interval of interest,
The GR data of interval of interest are denoted as two-dimensional array G (size of array G is identical as array P).
(3) (GR value is bigger, palaeogeomorphic buried depth for the positive correlation based on GR value in marine depositional environment and ancient landform buried depth
It is deeper), using GR weight coefficient value, (GR of all sampling points is flat in window when the GR value of current sample and the rectangle put centered on the point
The ratio of mean value) bearing calibration is corrected ancient landform array P, and this step specific implementation step is as follows；
1. enabling the ancient landform array after the correction that two-dimensional array PP is purpose interval, tax initial value is array P:
PP=P
2. according to the geologic setting in research area, window parameter (length of window when NW × NW, NW are) when selecting suitable rectangle:
When the geologic setting variation in research area is smaller, NW value is more than or equal to 7；When research area geologic setting change greatly, NW value
Less than or equal to 5, enable
3. choosing the 1st bar of survey line number for starting to calculate
4. choosing the 1st Taoist monastic name for starting to calculate
5. calculate centered on current point (i_line, j_cdp) when window (NW × NW) in GR average value and ancient landform
Average value, calculation formula are as follows:
6. calculating the GR weight coefficient value A of current point:
7. being corrected using GR weight coefficient value A to the ancient landform value of current point (i_line, j_cdp):
PP (i_line, j_cdp)=P (i_line, j_cdp)+A × (P_ave-P (i_line, j_cdp))
PP (i_line, j_cdp) is the final ancient landform value after current point (i_line, j_cdp) correction in formula.
8. enable i_line constant, j_cdp=j_cdp+1, circulation aforesaid operations 5.~8., until
9. enable i_line=i_line+1, circulation aforesaid operations 4.~9., until
(4) two-dimensional array PP is exported, for ancient landform data after correction.
Illustrate: due to the present invention use rectangle when window be corrected, by when window boundary influenced, the boundary of PP array is deposited
In the non-correcting area of half time window length.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (2)
1. a kind of new marine deposit stratum ancient landform bearing calibration based on gamma (GR) data volume, it is characterized in that including following
Step:
Step 1: the ancient landform data (being denoted as two-dimensional array P) of interval of interest are calculated using conventional ancient landform analysis method；
Step 2: the GR data volume in research area is calculated using conventional post-stack inversion method, and extracts the GR data of interval of interest
(being denoted as two-dimensional array G)；
Step 3: (GR value is bigger, palaeogeomorphic buried depth for the positive correlation based on GR value in marine depositional environment and ancient landform buried depth
It is deeper), using GR weight coefficient value, (GR of all sampling points is flat in window when the GR value of current sample and the rectangle put centered on the point
The ratio of mean value) bearing calibration is corrected ancient landform array P.
2. a kind of new marine deposit stratum ancient landform bearing calibration based on GR data volume as described in claim 1, special
Sign is positive correlation of the step 3 based on GR value in marine depositional environment and ancient landform buried depth, and (GR value is bigger, palaeogeomorphic to bury
It is deeper), use GR weight coefficient value (the GR value of current sample with put centered on the point rectangle when window in all sampling points GR
The ratio of average value) bearing calibration is corrected ancient landform array P, and this step specific implementation step is as follows:
1. enabling the ancient landform array after the correction that two-dimensional array PP is purpose interval, tax initial value is array P:
PP=P
2. selecting window parameter when suitable rectangle (length of window when NW × NW, NW are) according to the geologic setting in research area: when grinding
The geologic setting variation for studying carefully area is smaller, and NW value is more than or equal to 7；When the geologic setting in research area changes greatly, NW value is less than
Equal to 5, enable
3. choosing the 1st bar of survey line number for starting to calculate
4. choosing the 1st Taoist monastic name for starting to calculate
5. calculate centered on current point (i_line, j_cdp) when window (NW × NW) in GR average value and ancient landform it is average
Value, calculation formula are as follows:
6. calculating the GR weight coefficient value A of current point:
7. being corrected using GR weight coefficient value A to the ancient landform value of current point (i_line, j_cdp):
PP (i_line, j_cdp)=P (i_line, j_cdp)+A × (P_ave-P (i_line, j_cdp))
PP (i_line, j_cdp) is the final ancient landform value after current point (i_line, j_cdp) correction in formula；
8. enable i_line constant, j_cdp=j_cdp+1, circulation aforesaid operations 5.~8., until
9. enable i_line=i_line+1, circulation aforesaid operations 4.~9., until
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Cited By (1)
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| CN113640870A (en) * | 2021-07-27 | 2021-11-12 | 中国石油天然气股份有限公司西南油气田分公司勘探开发研究院 | Sedimentary ancient landform restoration method, system and equipment for karst degradation interface |
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Cited By (2)
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| CN113640870A (en) * | 2021-07-27 | 2021-11-12 | 中国石油天然气股份有限公司西南油气田分公司勘探开发研究院 | Sedimentary ancient landform restoration method, system and equipment for karst degradation interface |
| CN113640870B (en) * | 2021-07-27 | 2024-02-23 | 中国石油天然气股份有限公司西南油气田分公司勘探开发研究院 | Method, system and equipment for recovering sedimentary paleo-topography of karst ablation interface |
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