CN104849762B - Enter the method for layer point information correction oil reservoir top surface micro-structure using horizontal well - Google Patents
Enter the method for layer point information correction oil reservoir top surface micro-structure using horizontal well Download PDFInfo
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Abstract
The present invention relates to a kind of calculated level well development reservoir formation true dip angle, so as to be corrected technology to oil reservoir top surface micro-structure, delay response characteristic during sand-shale boundary is more particularly to passed through using Natural Gamma-ray Logging Curves, determine delay between the area length, with reference to the drilling well inclination angle explained in well logging and azimuth, derive and calculate the computational methods that more accurate horizontal well enters layer point stratum true dip angle, draw out stratigraphic dip plan, and horizontal well oil reservoir top surface micro-structure is corrected based on this, draw the contour map for being smaller than 2m, instruct oil reservoir reasonable development and Tapping Residual Oil.The present invention overcomes the limitation for carrying out top surface micro-structure correction merely with well point height above sea level and seismic data at present, propose a kind of method of horizontal well development oil reservoir top surface micro-structure correction, horizontal well is made full use of to enter the information of layer point, real stratigraphic dip is obtained, so as to more accurately carry out oil reservoir top surface Micro-structure research.
Description
Technical field
The present invention relates to a kind of calculated level well development reservoir formation true dip angle, and using true dip angle distribution map to reservoir top
The method that face micro-structure is corrected.
Background technology
Micro-structure refers to that in total oil reservoir tectonic setting the construction shown by the fine fluctuations of oil reservoir in itself is special
Sign, its protuberance is low with depression amplitude, and closed area is small, and without certain directionality, and form is irregular, and irregular distribution can follow, such as
Without more detailed research, it is difficult to find local micro-structure.Oil field development practice have shown that, micro-structure form and amplitude size
Directly affect the distribution of the waterflooding extraction and remaining oil of oil reservoir, for oil reservoir can reasonable development and later stage Tapping Residual Oil have
Significance.
Research for oil reservoir micro-structure at present is mainly by compared with dense well pattern drilling data, three dimensional seismic data and substratum
What fine correlation achievement was carried out, specific research method substantially has two kinds：First, based on compared with dense well pattern data, at the same with well logging
Data is combined, and using main layer of sand top surface or bottom surface as standard, structural map is drawn using small spacing isopleth, interpolation isoline method；
Second, it is combined Study In Reservoir micro-structure with well-log information with 3-D seismics or high-resolution three-dimension seismic data.Both the above passes
The research method of system is all had some limitations, and first method is corrected merely with well point height above sea level data, lacks stratum
Inclination angle and tendency control, are difficult to accurate Characterization for the excessive form of micro-structure between well；Second method is limited in that original
The accuracy of beginning seismic data, if seismic data accuracy can not meet the requirement of Micro-structure research, this work is just difficult to out
Exhibition.
The content of the invention
It is an object of the invention to overcome to carry out top surface micro-structure correction merely with well point height above sea level and seismic data at present
A kind of limitation, there is provided accurate, practical and easy to spread top surface micro-structure bearing calibration.
To achieve these goals, the concrete technical scheme that uses of the present invention is：Enter layer point information correction using horizontal well
The method of oil reservoir top surface micro-structure, comprises the following steps：
Step 1：Using Natural Gamma-ray Logging Curves through delay response characteristic during sand-shale boundary and rock stratum face
Relation, based on Natural Gamma-ray Logging Curves data, it is determined that delay response distance, specify the angle between well layer；Step
Two：With reference to the drilling well inclination angle explained in well logging and azimuth, and utilize well point height above sea level data, derive and calculate compared with
Enter layer point stratum true dip angle for accurate horizontal well, the calculation formula that the horizontal well enters layer point stratum true dip angle can be divided into two
Kind situation：
(1), horizontal well along dip direction penetrate when：
(1) apparent formation dip α is calculateda
Apparent dip
Wherein：γ is that horizontal well enters angle layer between locus of points tangent line and stratum, i.e. well layer angle, rad；
Calculation formula is
Wherein：R be natural gamma logging device investigation depth, m；
L responds the half of distance, m for delay；
(2) ask for regarding true tendency angle ω
Depending on true tendency angle ω=βs-βw
Wherein：βsFor dip direction azimuth, rad；
βwTo enter a layer Dian Jing tracks azimuth, rad；
(3) stratum true dip angle α is calculatedt
In formula：
θ is well track inclination angle, rad；
R be natural gamma logging device investigation depth, m；
L responds the half of distance, m for delay；
βsFor dip direction azimuth, rad；
βwTo enter a layer Dian Jing tracks azimuth, rad；
(2), horizontal well against dip direction penetrate when：
(1) apparent formation dip α is calculateda
Apparent dip
(2) depending on true tendency angle acquiring method and horizontal well along dip direction penetrate when computational methods it is identical；
(3) stratum true dip angle is asked for
According to horizontal well along dip direction penetrate when stratum true dip angle acquiring method, worn with reference to horizontal well against dip direction
Fashionable apparent dip calculation formula, the stratum true dip angle calculation formula of this situation can be written as：
Step 3：The drafting and utilization of stratigraphic dip plan
According to stratum true dip angle calculation formula, the virtual value number that horizontal well in oil field enters layer point stratum true dip angle can be counted
According to and average data, when core intersection is relatively thin, most horizontal wells may frequently pass oil reservoir top bottom surface in oil field, this
When, a bite well can read it is multiple enter layer point information, based on this, using Geologic modeling interpolation method, precision can be drawn
Higher stratigraphic dip flat distribution map；Based on the accurately inclination layer plan of drafting, amendment horizontal well enters a layer point
Stratum relief height, while construction by Horizontal Well is corrected, obtains the layer of sand of the 2m spacing available for Instructing manufacture
Top surface micro-structure figure.
The tradition research method merely with well point height above sea level data and seismic data is different from, method of the invention is to utilize certainly
Relation of the gemma ray logging curve through delay response characteristic during sand-shale boundary and rock stratum face, with gamma ray log
Based on profile, it is determined that delay response distance, specifies the angle between well layer；At the same time, with reference to being solved in well logging
The drilling well inclination angle released and azimuth, and well point height above sea level data is utilized, derive and calculate more accurate horizontal well and enter layer
Point stratum true dip angle, and its effective Value Data peace mean data is counted, stratigraphic dip plan is drawn out, and with this
Based on horizontal well oil reservoir top surface micro-structure is corrected, draw and be smaller than 2m contour map, instruct oil reservoir rationally to open
Hair and Tapping Residual Oil.
Brief description of the drawings：
Fig. 1 is the method flow diagram that the present invention enters layer point information correction oil reservoir top surface micro-structure using horizontal well；
Fig. 2 be horizontal well path along dip direction penetrate when situation；
Fig. 3 be horizontal well path against dip direction penetrate when situation；
Fig. 4 is calculates the well layer angle method figure into layer point using the delay response characteristic of gamma ray curve, according to figure
Triangle relation in shape can draw the calculation formula of well layer angle；
Fig. 5 is the computational methods figure at dip direction angle, and XY is dip direction line in figure.
Embodiment
Describe the present invention in detail referring to the drawings enters layer point information correction oil reservoir top surface micro-structure using horizontal well
Method.
Situation one, horizontal well along dip direction penetrate when
1. calculate stratum true dip angle αt
(1) apparent formation dip α is calculateda
First, delay response characteristic during sand-shale boundary is passed through according to gamma ray curve, it is straight on well logging complex chart
Reading delay response distance is connect, its half is designated as L；Then, horizontal well Natural Gamma-ray Logging Curves investigation depth statistics is established
Scheme (or using average probing depths), obtain the investigation depth r of gamma-ray tool；Then, as the triangle relation shown in accompanying drawing 4
Figure, horizontal well is calculated and enters angle γ layer between locus of points tangent line and stratum, i.e. well layer angleFinally,
A layer Dian Jing tracks tiltangleθ is entered according to reading, horizontal well is established and enters layer point apparent dip calculation formula：In rectangle plane ABDE
In (entering the rectangle plane that the well orbit tangent of layer point and horizontal line form by horizontal well), in right angle ∠ EAB, apparent dipAs shown in Figure 2.
(2) asked for depending on true tendency angle ω
As shown in Figure 5, the height value of horizontal well in oil field is first measured, with 3 points of methods for determining face, chooses 3 mouthfuls (or 3 mouthfuls
More than) well enters layer point height above sea level, simply determine an approximate top surface；Then, horizontal plane and the intersecting lens of construction face are made, and
In this line projection to horizontal plane, the tendency azimuthal angle beta on stratum will be calculateds；Finally, according to the well track azimuthal angle beta for entering layer pointw,
It is determined that regarding true tendency angle ω=βs-βw。
(3) stratum true dip angle α is calculatedt
Using right angled triangle ABD, ABC and BCD corner relation, with reference to apparent formation dip αa, stratum can be obtained indirectly
True dip angle (shown in accompanying drawing 2), specific calculating process are as follows：
In Rt Δs ABD：AB=BDtan (αa)
In Rt Δs BCD：BC=BDcos (ω)
It can draw：
In Rt Δs ABC：
(wherein：AB is that horizontal well enters layer point plumb line, and BC is the true line of dip in stratum, and BD is that stratum regards line of dip)
Above-mentioned parameter is substituted into, obtaining general expression is：
In formula：
θ is well track inclination angle, rad；
R be natural gamma logging device investigation depth, m；
L responds the half of distance, m for delay；
βsFor dip direction azimuth, rad；
βwTo enter a layer Dian Jing tracks azimuth, rad；
2. the drafting of stratigraphic dip plan
According to stratum true dip angle calculation formula, the virtual value number that horizontal well in oil field enters layer point stratum true dip angle can be counted
According to and average data.When core intersection is relatively thin, most horizontal wells may frequently pass oil reservoir top bottom surface in oil field, this
When, a bite well can read it is multiple enter layer point information, based on this, using Geologic modeling interpolation method, precision can be drawn
Higher stratigraphic dip flat distribution map.
3. utilize the stratigraphic dip flat distribution map drawn
Based on the accurately inclination layer plan of drafting, amendment horizontal well enters the stratum relief height of layer point, together
When construction by Horizontal Well is corrected, obtain the layer of sand top surface micro-structure figure of the 2m spacing available for Instructing manufacture, can be
Oil reservoir implements waterflooding extraction strategy in next step and searching remaining oil enriched area provides help.
Situation two, horizontal well against dip direction penetrate when
1. calculate stratum true dip angle αt
(1) apparent formation dip α is calculateda
According to horizontal well along dip direction penetrate when stratigraphic dip computational methods, with reference to shown in accompanying drawing 3 and accompanying drawing 4
Angular relationship, the apparent dip when horizontal well penetrates stratum against dip direction can be obtained：
(2) it is identical with the computational methods of situation one to regard true tendency angle acquiring method
(3) stratum true dip angle is asked for
According to circumstances one stratum true dip angle acquiring method, with reference to horizontal well against dip direction penetrate when apparent dip calculate
Formula, the stratum true dip angle calculation formula of situation two can be written as：
The drafting of stratigraphic dip plan and operated using the method for the stratigraphic dip flat distribution map of drafting with situation one
It is identical, repeat no more.
Claims (1)
1. entering the method for layer point information correction oil reservoir top surface micro-structure using horizontal well, comprise the following steps：
Step 1：Utilize pass of the Natural Gamma-ray Logging Curves through delay response characteristic during sand-shale boundary and rock stratum face
System, based on Natural Gamma-ray Logging Curves data, it is determined that delay response distance, specifies the angle between well layer；Step 2：Knot
The drilling well inclination angle and azimuth explained in well logging are closed, and utilizes well point height above sea level data, derives and calculates more smart
True horizontal well enters layer point stratum true dip angle, and the calculation formula that the horizontal well enters layer point stratum true dip angle can be divided into two kinds of feelings
Condition：
(1), horizontal well along dip direction penetrate when：
(1) apparent formation dip α is calculateda
Apparent dip
Wherein：γ is that horizontal well enters angle layer between locus of points tangent line and stratum, i.e. well layer angle, rad；
Calculation formula is
Wherein：R be natural gamma logging device investigation depth, m；
L responds the half of distance, m for delay；
(2) ask for regarding true tendency angle ω
Depending on true tendency angle ω=βs-βw
Wherein：βsFor dip direction azimuth, rad；
βwTo enter a layer Dian Jing tracks azimuth, rad；
(3) stratum true dip angle α is calculatedt
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<mi>&alpha;</mi>
<mi>t</mi>
</msub>
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<mrow>
<mi>tan</mi>
<mo>&lsqb;</mo>
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<mi>&pi;</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mi>&theta;</mi>
<mo>-</mo>
<mi>arctan</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mi>r</mi>
<mi>L</mi>
</mfrac>
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</mrow>
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<mi>c</mi>
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<mo>(</mo>
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<mi>&beta;</mi>
<mi>s</mi>
</msub>
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<mi>&beta;</mi>
<mi>w</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
</mfrac>
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</mrow>
</mrow>
In formula：
θ is well track inclination angle, rad；
R be natural gamma logging device investigation depth, m；
L responds the half of distance, m for delay；
βsFor dip direction azimuth, rad；
βwTo enter a layer Dian Jing tracks azimuth, rad；
(2), horizontal well against dip direction penetrate when：
(1) apparent formation dip α is calculateda
Apparent dip
(2) depending on true tendency angle acquiring method and horizontal well along dip direction penetrate when computational methods it is identical；
(3) stratum true dip angle is asked for
According to horizontal well along dip direction penetrate when stratum true dip angle acquiring method, with reference to horizontal well against dip direction penetrate when
Apparent dip calculation formula, the stratum true dip angle calculation formula of this situation can be written as：
<mrow>
<msub>
<mi>&alpha;</mi>
<mi>t</mi>
</msub>
<mo>=</mo>
<mi>arctan</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mi>tan</mi>
<mo>&lsqb;</mo>
<mi>&theta;</mi>
<mo>+</mo>
<mi>arctan</mi>
<mrow>
<mo>(</mo>
<mfrac>
<mi>r</mi>
<mi>L</mi>
</mfrac>
<mo>)</mo>
</mrow>
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<mfrac>
<mi>&pi;</mi>
<mn>2</mn>
</mfrac>
</mrow>
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<mi>c</mi>
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<mi>s</mi>
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<mo>(</mo>
<msub>
<mi>&beta;</mi>
<mi>s</mi>
</msub>
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<mi>&beta;</mi>
<mi>w</mi>
</msub>
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</mrow>
</mrow>
</mfrac>
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</mrow>
</mrow>
Step 3：The drafting and utilization of stratigraphic dip plan
According to stratum true dip angle calculation formula, can count horizontal well in oil field enter layer point stratum true dip angle effective Value Data and
Average data, when core intersection is relatively thin, most horizontal wells may frequently pass oil reservoir top bottom surface in oil field, now,
A bite well can read it is multiple enter layer point information, based on this, using Geologic modeling interpolation method, it is higher precision can be drawn
Stratigraphic dip flat distribution map；Based on the accurately inclination layer plan of drafting, amendment horizontal well enters the ground of layer point
Layer relief height, while construction by Horizontal Well is corrected, obtain the layer of sand top surface of the 2m spacing available for Instructing manufacture
Micro-structure figure.
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| CN105631753B (en) * | 2015-12-14 | 2020-03-10 | 中国石油天然气集团公司 | Horizontal well oil reservoir profile modeling method based on stratum attitude |
| CN106324689B (en) * | 2016-06-24 | 2018-05-11 | 杭州迅美科技有限公司 | Resistivity anisotropy recognition methods under a kind of horizontal well ground environment |
| CN106154322B (en) * | 2016-08-02 | 2018-08-14 | 中国石油天然气集团公司 | Log curve correction method and apparatus |
| CN109025981A (en) * | 2018-06-22 | 2018-12-18 | 中国石油天然气股份有限公司 | Accumulate correlation of sand bodies method and system in meandering stream side |
| CN109214945B (en) * | 2018-10-11 | 2022-07-05 | 中石化石油工程技术服务有限公司 | Method and system for calculating single well stratum interface burial depth |
| CN112160740B (en) * | 2020-09-08 | 2024-04-19 | 中石化石油工程技术服务有限公司 | Method for determining horizontal well target layer microstructure based on element logging |
| CN113537520B (en) * | 2021-06-29 | 2024-05-28 | 中国石油化工股份有限公司 | Fault position locating method |
| CN115097517B (en) * | 2022-06-24 | 2023-05-09 | 中国矿业大学 | Discrete fracture network characterization and risk prediction method based on microseism space-time distribution |
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| CN103643945B (en) * | 2013-11-26 | 2016-06-22 | 辽河石油勘探局 | Thin layer lithology RESERVOIR RECOGNITION and horizontal well drilling tracking |
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