CN104849762A - Method for correcting oil reservoir top surface micro structure by using information of horizontal well stratum penetrating point - Google Patents

Method for correcting oil reservoir top surface micro structure by using information of horizontal well stratum penetrating point Download PDF

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CN104849762A
CN104849762A CN201510267859.3A CN201510267859A CN104849762A CN 104849762 A CN104849762 A CN 104849762A CN 201510267859 A CN201510267859 A CN 201510267859A CN 104849762 A CN104849762 A CN 104849762A
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dip
horizontal well
stratum
well
angle
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CN104849762B (en
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王金凯
卢浩
谢俊
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Shandong University of Science and Technology
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Shandong University of Science and Technology
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Abstract

The invention relates to a technology for calculating a horizontal well oil reservoir development stratum true dip angle so as to correct an oil reservoir top surface micro structure, and particularly relates to a method for correcting the oil reservoir top surface micro structure by using information of a horizontal well stratum penetrating point. The method comprises the steps of determining the length of a delay interval by using delayed response characteristics of a natural gamma-ray logging curve when penetrating through a sand shale boundary, deducing and calculating a more accurate calculation method for a stratum true dip angle of the horizontal well stratum penetrating point by being combined with a well drilling inclination angle and an azimuth angle explained in the logging process, drawing a stratum dip angle plane graph, correcting the horizontal well oil reservoir top surface micro structure by taking the stratum dip angle plane graph as a basis, drawing a contour map with the spacing being less than 2m, and guiding reasonable development of an oil reservoir and potential tapping of residual oil. The method provided by the invention overcomes limitations in carrying out correction on the top surface micro structure by only using well point altitude and seismic data at present, provides a method for correcting horizontal well oil reservoir development top surface micro structure, makes full use of the information of the horizontal well stratum penetrating point, and acquires the true stratum dip angle, thereby studying the oil reservoir top surface micro structure more accurately.

Description

Horizontal well is utilized to enter a layer method for dot information correction oil reservoir end face micro-structure
Technical field
The present invention relates to a kind of calculated level well development reservoir formation main dip, and utilize the method that main dip distribution plan corrects oil reservoir end face micro-structure.
Background technology
Micro-structure refers in total oil reservoir structural setting, the structural attitude shown by fine fluctuations of oil reservoir itself, its protuberance and depression amplitude low, closed area is little, without certain directivity, and form is irregular, and irregular distribution can follow, if do not carried out comparatively detailed research, be difficult to find local micro-structure.Oil-field development practice show, micro-structure form and amplitude size directly affect the waterflooding of oil reservoir and the distribution of remaining oil, for oil reservoir can reasonable development and later stage Tapping Residual Oil significant.
At present for the research of oil reservoir micro-structure mainly by carrying out compared with dense well pattern drilling data, three dimensional seismic data and substratum fine correlation achievement, concrete research method roughly has two kinds: one to be based on comparatively dense well pattern data, combine with well-log information simultaneously, with main layer of sand end face or bottom surface for standard, Small Distance isoline, interpolation isoline method is adopted to draw structural map; Two is to combine with well-log information Study In Reservoir micro-structure with 3-D seismics or high-resolution three-dimension seismic data.Above two kinds of traditional research methods all have some limitations, and first method only utilizes well point height above sea level data to correct, and inclination layer and tendency control scantily, and the excessive form for micro-structure between well is difficult to accurate Characterization; The limitation of second method is the degree of accuracy of original seismic data, if seismic data degree of accuracy cannot meet the requirement of Micro-structure research, this work is just difficult to carry out.
Summary of the invention
The object of the invention is to overcome only utilizes well point height above sea level and seismic data to carry out the limitation of end face micro-structure correction at present, provide a kind of accurately, practical and be easy to the end face micro-structure bearing calibration promoted.
To achieve these goals, the concrete technical scheme that the present invention adopts is: utilize horizontal well to enter a layer method for dot information correction oil reservoir end face micro-structure, comprise the following steps:
Step one: utilize Natural Gamma-ray Logging Curves through the relation delayed response feature during sand-shale boundary and face, rock stratum, based on GR logging curve data, determines to postpone burst length, specifies the angle between well layer; Step 2: in conjunction with the drilling well pitch angle of explaining in well logging and position angle, and utilize well point height above sea level data, deriving and calculating comparatively accurate horizontal well enters layer point stratum main dip, and this computing formula can be divided into two kinds of situations:
1, when horizontal well penetrates along dip direction:
(1) apparent formation dip α is calculated a
Apparent dip α a = π 2 - θ - γ
Wherein: γ is the angle that horizontal well enters layer between locus of points tangent line and stratum, i.e. well layer angle, rad;
Computing formula is r is the investigation depth of natural gamma logging device, m; L is the half of delayed response distance, m;
(2) ask for and look true tendency angle ω
Depending on true tendency angle ω=β sw
Wherein: β sfor dip direction position angle, rad;
β wfor entering layer point well track position angle, rad;
(3) stratum main dip α is calculated t
α t = arctan ( tan [ π 2 - θ - arctan ( r L ) cos ( β s - β w ) )
In formula:
θ is well track pitch angle, rad;
R is the investigation depth of natural gamma logging device, m;
L is the half of delayed response distance, m;
β sfor dip direction position angle, rad;
β wfor entering layer point well track position angle, rad;
2, when horizontal well penetrates against dip direction:
(1) apparent formation dip α is calculated a
Apparent dip α a = θ + γ - π 2
(2) computing method when penetrating along dip direction with horizontal well depending on true tendency angle acquiring method are identical;
(3) stratum main dip is asked for
Stratum main dip acquiring method when penetrating along dip direction according to horizontal well, apparent dip computing formula when Bound moisture horizontal well penetrates against dip direction, the stratum main dip computing formula of this situation can be written as:
α t = arctan ( tan [ θ + arctan ( r L ) - π 2 cos ( β s - β w ) )
Step 3: the drafting of stratigraphic dip planimetric map and utilization
According to stratum main dip computing formula, the data such as effective value, mean value that horizontal well in oil field enters layer point stratum main dip can be added up, when core intersection is relatively thin, in oil field, most horizontal well frequently may pass bottom surface, oil reservoir top, now, a bite well can read multiple enter layer dot information, based on this, utilize Geologic modeling interpolation method, the stratigraphic dip flat distribution map that precision is higher can be drawn; Based on the planimetric map of inclination layer accurately drawn, revise the stratum relief height that horizontal well enters layer point, the other structure of Horizontal Well is corrected simultaneously, obtain the layer of sand end face micro-structure figure of the 2m spacing that can be used for Instructing manufacture.
Be different from the traditional research method only utilizing well point height above sea level data and seismic data, method of the present invention utilizes Natural Gamma-ray Logging Curves through the relation delayed response feature during sand-shale boundary and face, rock stratum, based on GR logging curve data, determine to postpone burst length, specify the angle between well layer; Meanwhile, in conjunction with the drilling well pitch angle of explaining in well logging and position angle, and utilize well point height above sea level data, derive and calculate comparatively accurate horizontal well and enter layer point stratum main dip, and its data such as effective value, mean value are added up, draw out stratigraphic dip planimetric map, and based on this horizontal well oil reservoir end face micro-structure is corrected, draw the contour map that spacing is less than 2m, instruct oil reservoir reasonable development and Tapping Residual Oil.
Accompanying drawing illustrates:
Fig. 1 is that the present invention utilizes horizontal well to enter a layer method flow diagram for dot information correction oil reservoir end face micro-structure;
Fig. 2 is the situation of horizontal well path when penetrating along dip direction;
Fig. 3 is the situation of horizontal well path when penetrating against dip direction;
Fig. 4 is the well layer angle method figure utilizing the delayed response feature calculation of gamma ray curve to enter layer point, can draw the computing formula of well layer angle according to the triangle relation in figure;
Fig. 5 is the computing method figure at dip direction angle, and in figure, XY is dip direction line.
Embodiment
Describe the horizontal well that utilizes of the present invention in detail referring to accompanying drawing and enter a layer method for dot information correction oil reservoir end face micro-structure.
When situation one, horizontal well penetrate along dip direction
1. calculate stratum main dip α t
(1) apparent formation dip α is calculated a
First, according to gamma ray curve through delayed response feature during sand-shale boundary, well logging synthesizing map directly reads delay distance, its half is designated as L; Then, set up horizontal well Natural Gamma-ray Logging Curves investigation depth statistical graph (or using average probing depths), obtain the investigation depth r of gamma-ray tool; Then, by the triangle relation figure shown in accompanying drawing 4, calculate horizontal well and enter angle γ layer between locus of points tangent line and stratum, i.e. well layer angle finally, layer point well track tiltangleθ is entered according to what read, set up horizontal well and enter layer point apparent dip computing formula: in rectangle plane ABDE (being entered the rectangle plane that the well orbit tangent of layer point and horizontal line are formed by horizontal well), in right angle ∠ EAB, apparent dip as shown in Figure 2.
(2) ask for depending on true tendency angle ω
As shown in Figure 5, first measure the height value of horizontal well in oil field, determine the method in face with 3, that chooses 3 mouthfuls of (or more than 3 mouthfuls) wells enters layer point height above sea level, simply determines an approximate end face; Then, make the intersecting lens of surface level and structural surface, and by this line projection on surface level, calculate the tendency azimuthal angle beta on stratum s; Finally, according to the well track azimuthal angle beta entering layer point w, determine to look true tendency angle ω=β sw.
(3) stratum main dip α is calculated t
Utilize the corner relation of right-angle triangle ABD, ABC and BCD, in conjunction with apparent formation dip α a, indirectly can obtain stratum main dip (shown in accompanying drawing 2), concrete computation process is as follows:
In Rt Δ ABD: AB=BDtan (α a)
In Rt Δ BCD: BC=BDcos (ω)
Can draw:
In Rt Δ ABC:
α t = arctan ( AB BD ) = arctan tan ( α a ) cos ( ω )
(wherein: AB is that horizontal well enters layer point pedal line, and BC is the true line of dip in stratum, and BD is that line of dip is looked on stratum)
Substituted into by above-mentioned parameter, obtaining general expression is:
α t = arctan ( tan [ π 2 - θ - arctan ( r L ) cos ( β s - β w ) )
In formula:
θ is well track pitch angle, rad;
R is the investigation depth of natural gamma logging device, m;
L is the half of delayed response distance, m;
β sfor dip direction position angle, rad;
β wfor entering layer point well track position angle, rad;
2. the drafting of stratigraphic dip planimetric map
According to stratum main dip computing formula, the data such as effective value, mean value that horizontal well in oil field enters layer point stratum main dip can be added up.When core intersection is relatively thin, in oil field, most horizontal well frequently may pass bottom surface, oil reservoir top, now, a bite well can read multiple enter layer dot information, based on this, utilize Geologic modeling interpolation method, the stratigraphic dip flat distribution map that precision is higher can be drawn.
3. utilize the stratigraphic dip flat distribution map drawn
Based on the planimetric map of inclination layer accurately drawn, revise the stratum relief height that horizontal well enters layer point, the other structure of Horizontal Well is corrected simultaneously, obtain the layer of sand end face micro-structure figure of the 2m spacing that can be used for Instructing manufacture, next step implements waterflooding strategy and finds remaining oil enriched area to offer help to can be oil reservoir.
When situation two, horizontal well penetrate against dip direction
1. calculate stratum main dip α t
(1) apparent formation dip α is calculated a
Stratigraphic dip computing method when penetrating along dip direction according to horizontal well, by reference to the accompanying drawings 3 and the angular relationship shown in accompanying drawing 4, the apparent dip when horizontal well penetrates stratum against dip direction can be obtained α a = θ + γ - π 2
(2) tendency angle acquiring method is looked true identical with situation one computing method
(3) stratum main dip is asked for
The according to circumstances stratum main dip acquiring method of, apparent dip computing formula when Bound moisture horizontal well penetrates against dip direction, the stratum main dip computing formula of situation two can be written as:
α t = arctan ( tan [ θ + arctan ( r L ) - π 2 cos ( β s - β w ) )
The method of the stratigraphic dip flat distribution map that the drafting of stratigraphic dip planimetric map and utilization are drawn operates identical with situation one, repeats no more.

Claims (1)

1. utilize horizontal well to enter a layer method for dot information correction oil reservoir end face micro-structure, comprise the following steps:
Step one: utilize Natural Gamma-ray Logging Curves through the relation delayed response feature during sand-shale boundary and face, rock stratum, based on GR logging curve data, determines to postpone burst length, specifies the angle between well layer; Step 2: in conjunction with the drilling well pitch angle of explaining in well logging and position angle, and utilize well point height above sea level data, deriving and calculating comparatively accurate horizontal well enters layer point stratum main dip, and this computing formula can be divided into two kinds of situations:
(1) when, horizontal well penetrates along dip direction:
(1) apparent formation dip α is calculated a
Apparent dip
Wherein: γ is the angle that horizontal well enters layer between locus of points tangent line and stratum, i.e. well layer angle, rad;
Computing formula is (r is the investigation depth of natural gamma logging device, m; L is the half of delayed response distance, m; )
(2) ask for and look true tendency angle ω
Depending on true tendency angle ω=β sw
Wherein: β sfor dip direction position angle, rad;
β wfor entering layer point well track position angle, rad;
(3) stratum main dip α is calculated t
In formula:
θ is well track pitch angle, rad;
R is the investigation depth of natural gamma logging device, m;
L is the half of delayed response distance, m;
β sfor dip direction position angle, rad;
β wfor entering layer point well track position angle, rad;
(2) when, horizontal well penetrates against dip direction:
(1) apparent formation dip α is calculated a
Apparent dip
(2) computing method when penetrating along dip direction with horizontal well depending on true tendency angle acquiring method are identical;
(3) stratum main dip is asked for
Stratum main dip acquiring method when penetrating along dip direction according to horizontal well, apparent dip computing formula when Bound moisture horizontal well penetrates against dip direction, the stratum main dip computing formula of this situation can be written as:
Step 3: the drafting of stratigraphic dip planimetric map and utilization
According to stratum main dip computing formula, the data such as effective value, mean value that horizontal well in oil field enters layer point stratum main dip can be added up, when core intersection is relatively thin, in oil field, most horizontal well frequently may pass bottom surface, oil reservoir top, now, a bite well can read multiple enter layer dot information, based on this, utilize Geologic modeling interpolation method, the stratigraphic dip flat distribution map that precision is higher can be drawn; Based on the planimetric map of inclination layer accurately drawn, revise the stratum relief height that horizontal well enters layer point, the other structure of Horizontal Well is corrected simultaneously, obtain the layer of sand end face micro-structure figure of the 2m spacing that can be used for Instructing manufacture.
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CN105631753A (en) * 2015-12-14 2016-06-01 中国石油天然气集团公司 Attitude of stratum-based horizontal well oil reservoir profile modeling method
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
CN106324689A (en) * 2016-06-24 2017-01-11 杭州迅美科技有限公司 Resistivity anisotropy recognition method in horizontal well stratum environment
CN106154322A (en) * 2016-08-02 2016-11-23 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 Method and system for comparing side accumulated sand bodies of meandering stream
CN109214945A (en) * 2018-10-11 2019-01-15 中石化石油工程技术服务有限公司 A kind of calculation method and system of individual well bed boundary buried depth
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CN112160740A (en) * 2020-09-08 2021-01-01 中石化石油工程技术服务有限公司 Horizontal well target layer microstructure determination method based on element logging
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
CN113537520A (en) * 2021-06-29 2021-10-22 中国石油化工股份有限公司 Fault position positioning method
CN113537520B (en) * 2021-06-29 2024-05-28 中国石油化工股份有限公司 Fault position locating method
CN115097517A (en) * 2022-06-24 2022-09-23 中国矿业大学 Discrete fracture network characterization and risk prediction method based on microseismic space-time distribution
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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