CN117518231A - Well depth design method for slope zone seismic exploration well - Google Patents
Well depth design method for slope zone seismic exploration well Download PDFInfo
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Abstract
The invention relates to a well depth design of a slope zone seismic exploration well, in particular to a well depth design method of a slope zone seismic exploration well. A well depth design method of a slope zone seismic exploration well comprises the following steps: step one, determining wellhead coordinates P of micro-logging 0 The bottom hole coordinates F of the micro-well, the exposed position coordinates A, B of the bedrock layer at the bottom of the alluvial zone on the two lateral sides of the alluvial zone, and the planned drilling point P of the earthquake exploration well; the bottom hole coordinate F of the micro-logging is P 0 Horizontal projection at the bedrock layer top interface; step two, establishing a geometrical model comprising inclined rock layers determined by inclined lines FA and FB and AB; and thirdly, determining the well depth h=PP 'of the earthquake exploration well with the slope area by taking the projection point of the planned drilling point P of the earthquake exploration well on the inclined rock surface as P'. The invention can solve the problem of larger uncertainty in the well depth design precision of the seismic exploration well with the slope zone in the prior art。
Description
Technical Field
The invention relates to a well depth design of a slope zone seismic exploration well, in particular to a well depth design method of a slope zone seismic exploration well.
Background
The slope zone is a geologic body formed by carrying and accumulating weathered detritus substances of the rock under the action of rainwater or snow water and gravity, the upper part of the slope zone is detritus, the ground surface is loose, the porosity is high, the compressibility is strong, and the stratum speed is generally 800-1000 m/s; the bottom of the permafrost zone is a bedrock layer with a hard texture and a typical formation velocity of 3000 to 4000m/s, the velocity of the bedrock being primarily dependent on lithology. Such as the formation shown in fig. 1, the alluvial zone is located above the downhill limestone and is formed by the accumulation of the upper mudstone and the weathered detritus of the sandstone. The gradient belt is generally positioned at a gentle slope or a slope toe, the range is generally not large, and the gradient belt has the characteristics of thicker middle and thinner edge, larger change of the gradient belt thickness Cheng Ji along the gradient direction and slow change of the gradient belt thickness Gao Chengji along the transverse direction perpendicular to the gradient direction.
In the exploration of well gun explosive source excited seismic waves, the depth of a seismic exploration well (namely a well gun excited well) is a very critical parameter, and the well depth is positioned below a high-speed layer, so that better seismic data quality can be obtained. For example, in the formation configuration shown in fig. 1, the preferred stimulation well depth is capable of reaching the formation. However, due to the thickness variation of the alluvial, the depth required for the seismic exploration wells at different positions is different, so that the quality of the seismic data is difficult to ensure due to the too shallow depth, and the seismic exploration cost is increased due to the too deep depth.
In the prior well depth design, a surface layer investigation method such as micro-logging, small refraction and the like is adopted to calculate the interface depth between a low-speed layer and a high-speed layer, and obtaining a high-speed layer top interface through spatial three-dimensional interpolation, and finally calculating the depth from the well head surface position of the designed well gun to the underground high-speed layer top interface to obtain the design degree of the excitation design well depth. The number of micro-well-logging corresponds to the number of spatial three-dimensional interpolation sampling points, the number and the positions of the micro-well-logging are influenced by factors such as cost, construction conditions and the like, more micro-well-logging cannot be set, a sparse zone exists, and the result obtained by the well depth design method is influenced by the density of the spatial three-dimensional interpolation sampling points (micro-well-logging) and the transverse change of the lithology of the surface layer of the work zone, so that the well depth design precision is restricted, and the well depth design precision is lower when the transverse change exists between the sparse zone of the spatial three-dimensional interpolation sampling points and the lithology of the surface layer of the work zone.
The Chinese patent with the publication number of CN106569282B discloses a design method for the depth of an excitation well for seismic acquisition, a shallow earth surface velocity model is obtained through micro-logging and seismic data inversion under the constraint of small refraction, and the depth of the excitation well is determined by combining experiments to obtain an optimal excitation velocity range. The method increases the existing seismic velocity information in the earlier stage, overcomes the inaccuracy of three-dimensional interpolation in the conventional well depth design, and increases the precision of the well depth design. However, there is still a great uncertainty in the well depth design accuracy of the seismic exploration well for work areas without early seismic data or areas with large lateral changes in the lithology of the surface of the work area, particularly for the slope zone.
Disclosure of Invention
The invention aims to provide a well depth design method of a slope zone seismic exploration well, which solves the problem of large uncertainty in the well depth design precision of the slope zone seismic exploration well in the prior art.
The invention relates to a well depth design method of a slope zone earthquake exploration well, which adopts the following technical scheme:
a well depth design method of a slope zone seismic exploration well comprises the following steps:
step one, determining wellhead coordinates P of micro-logging 0 (E 0 ，N 0 ，Z 0 ) Bottom hole coordinates of micro-logs F (E 0 ，N 0 ，Zh 0 ) Exposed position coordinates A (E) of bedrock layer at bottom of the alluvial zone on both lateral sides of the alluvial zone A ，N A ，Z A )、B(E B ，N B ，Z B ) And planned drilling points P (E, N, Z) for the seismic exploration well; the bottom hole coordinate F of the micro-logging is P 0 Horizontal projection at the bedrock layer top interface;
step two, a geometric model is established, wherein the geometric model comprises an inclined rock layer surface determined by an inclined line FA, an inclined line FB and an inclined line AB;
and thirdly, determining the well depth h=pp 'of the seismic exploration well with the projection point of the planned drilling point P (E, N, Z) of the seismic exploration well on the inclined rock surface as P' (E, N, zh).
The technical scheme has the beneficial effects that due to the fact that the exposed position information of the bedrock layer on the two lateral sides of the alluvial zone is introduced, the inclined rock layer determined according to the exposed position information and the geometric model established by the bottom hole coordinates of the micro-well in the micro-well logging interpretation result can more truly reflect the rock layer surface condition of the bedrock layer, and further, the well depth h=pp 'of the alluvial zone seismic exploration well can be determined according to the projection point P' of the planned drilling point P (E, N, Z) on the inclined rock layer; compared with the well depth design method in the prior art, the well depth design precision can be improved by means of the exposed position information of the base stratum on the two lateral sides of the permafrost zone for a work area or an area with large lateral change of the lithology of the surface layer of the work area without early seismic data, and the problem of large uncertainty on the well depth design precision of the permafrost zone seismic exploration well in the prior art is solved.
As a further defined technical solution: the plane formed by the X, Y axes in the coordinate system is parallel to AB and the tilt line FA defined by point F is perpendicular to AB.
The technical scheme further defined above has the beneficial effects that the model is convenient to build and match with a corresponding coordinate system, so that the data processing is convenient.
As a further defined technical solution: the geometric model in the second step comprises an inclined line BE parallel to the inclined line FA and equal in length to the inclined line FA, and an inclined rock level is formed by ABEF; step three, determining a normal vector N (U, V, W) of the inclined rock face ABEF according to the geometric model; and also includes the step of determining the point of failure according to the point of failure F (E 0 ，N 0 ，Zh 0 ) Normal vector equation U (E-E 0 )+V(N－N 0 )+W(Zh－Zh 0 ) The value of 0 is calculated as Zh, and determining the well depth h=pp' =z-Zh of the slope zone seismic exploration well.
The technical proposal further defined has the beneficial effects that the normal vector N (U, V, W) and the passing point F (E 0 ，N 0 ，Zh 0 ) The Zh can be conveniently calculated by the normal vector equation of (2), and the dependence on a computer is reduced or avoided.
As a further defined technical solution: the normal vector N (U, V, W) of the inclined rock level is calculated according to the true inclination angle alpha of the inclined rock level and the included angle omega of the inclination FD and the X axis of the inclined rock level ABEF: u=sin (α) cos (ω), v=sin (α) sin (ω), w=cos (α).
The technical scheme further defined above has the beneficial effects that the true dip angle alpha and the included angle omega are convenient to acquire, positive and negative values are convenient to determine according to quadrants corresponding to the FD, and the normal vector N (U, V, W) is convenient to calculate.
As a further defined technical solution: the true inclination angle alpha is calculated by the included angle theta between the horizontal plane projection CD of the vision inclination angle beta and AB corresponding to the observation direction line FB and the horizontal plane projection of the observation direction line FB according to tan (alpha) =tan (beta)/sin (theta).
The technical scheme further defined above has the advantage that the true dip angle alpha can be calculated relatively easily.
As a further defined technical solution: the included angle theta is calculated by a trigonometric function according to a geometric model.
As a further defined technical solution: the included angle θ is calculated from the included angle ω and the azimuth angle η of the observation direction line corresponding to the projection FC of the inclined line FB on the horizontal plane passing through the point F according to sin (θ) =cos (ω - η).
The technical scheme further defined above has the advantage that the included angle theta can be calculated relatively easily.
As a further defined technical solution: the angle ω is the azimuth angle of the inclination FD corresponding to the inclined line FAAccording to->And (5) calculating to obtain the product.
The technical proposal further defined has the beneficial effects thatCan be directly obtained, and is convenient for obtaining the included angle omega.
As a further defined technical solution: and (3) increasing the explosive column length on the basis of PP', so as to obtain the final seismic exploration well depth in the field seismic exploration.
The technical scheme has the beneficial effects that the actual depth construction depth of the seismic exploration well can be directly obtained, and the field operation is convenient.
As a further defined technical solution: the directions of the X axis and the Y axis of the three-dimensional Cartesian coordinate system corresponding to each coordinate point are consistent with the corresponding actual geographic direction of the earth.
The technical scheme further defined above has the beneficial effects that additional coordinate transformation is not needed, and the establishment of a geometric model is facilitated.
Drawings
FIG. 1 is a schematic diagram of a well depth design method for a seismic survey well with a slope zone corresponding to example 1 of the present invention, and a schematic diagram of a formation structure in the prior art;
FIG. 2 is a schematic diagram depicting formation outcrop for a alluvial zone;
FIG. 3 is a schematic diagram of a geometric model corresponding to example 1 of a well depth design method for a slope zone seismic exploration well in accordance with the present invention;
FIG. 4 is a flow chart of embodiment 1 of a method of well depth design for a permafrost seismic exploration well in accordance with the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It should be noted that in the present embodiment, relational terms such as "first" and "second" and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" or the like, as may occur, does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the depicted element.
In the description of the present invention, the terms "mounted," "connected," "coupled," and "connected," as may be used broadly, and may be connected, for example, fixedly, detachably, or integrally, unless otherwise specifically defined and limited; can be mechanically or electrically connected; either directly, indirectly through intermediaries, or in communication with the interior of the two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "provided" as may occur, for example, as an object of "provided" may be a part of a body, may be separately arranged from the body, and may be connected to the body, and may be detachably connected or may be non-detachably connected. The specific meaning of the above terms in the present invention can be understood by those skilled in the art in specific cases.
The present invention is described in further detail below with reference to examples.
Example 1 of a well depth design method for a alluvial seismic exploration well in the present invention:
the slope zone corresponding to the well depth design method of the slope zone earthquake prospecting well is shown in figure 1, and is formed by stacking purple mudstone and debris after sandstone weathering, wherein the slope zone is positioned above limestone under a slope. Outcrop data for the limestone formation includes the outcrop locations A, B, AB, which form the strike line for the surface outcrop formation. As common knowledge: the trend line is formed by the intersection line of the stratum level and any imaginary horizontal plane, and the trend, namely the extending direction of the two ends of the trend line, represents the horizontal extending direction of the stratum in the space, and the trend of the stratum has two directions which are 180 degrees different from each other. A straight line on the rock face, which is perpendicular to the trend line and is led downwards along the inclined plane, is called an inclined line, and represents the maximum gradient of the rock stratum; the direction indicated by the projection of the tilt line onto the horizontal plane is called the inclination of the rock formation, also called true inclination, which is only one, and the inclination indicates in which direction the rock formation is tilted. Other straight lines which are obliquely intersected with the trend line of the rock stratum and led downwards along the inclined plane are called as inclined lines; the direction in which its projection on the horizontal plane points, called the viewing direction. Either in orientation or in visual orientation, is directional, i.e., has only one direction. The inclined line on the rock level and the included angle projected on the horizontal plane are called the inclined angle, also called the true inclined angle; the magnitude of the dip angle indicates the degree of dip of the formation. Vision deviceThe angle between the inclined line and its projection on the horizontal plane is called the viewing inclination angle. Many inclined lines can be led out from any point on the plane, and many visual inclination angles exist. The true dip angle is the included angle between the inclined plane and the horizontal reference plane measured on the transverse plane of the vertical inclined plane trend; the apparent tilt angle is smaller than the true tilt angle of the point, i.e. the true tilt angle is always larger than the apparent tilt angle. The three elements of the formation dip, trend, and dip of the limestone in fig. 1 are all measured by a geological compass, as shown in fig. 2. In addition, P in FIG. 1 0 Representing wellhead coordinates of a microlog, P representing planned drilling points of a seismic exploration well, P 0 The specific position determining method of P is the prior art and can be determined according to factors such as grid division conditions, stratum conditions and the like.
In order to determine the well depth of a seismic exploration well, the invention provides a well depth design method of a slope zone seismic exploration well, which is shown in fig. 4 and specifically comprises the following steps:
1. reading micro-logging interpretation result data, rock stratum exposure position coordinates and rock stratum attitude data
In order to facilitate the representation and calculation of the model, a three-dimensional Cartesian coordinate system is firstly established, a plane formed by X, Y axes of the three-dimensional Cartesian coordinate system is a horizontal plane, an X axis corresponds to the forward eastern direction of the actual geographic direction of the earth, a Y axis corresponds to the north direction of the actual geographic direction of the earth, and the direction of a Z axis is vertically upwards and parallel to the depth direction of the micro-logging.
The micro-log interpretation result data comprises coordinates P of the wellhead position of the micro-log 0 (E 0 ，N 0 ，Z 0 )＝P 0 (500000, 3900000, 100), wherein E 0 For the eastern coordinate, N 0 North coordinate, Z 0 For the ground coordinates equal to 100m, P 0 The thickness of the slope zone h0 = 25 meters, namely the bottom of the micro-logging vertical well is positioned at P 0 25 meters below the ground surface, and drilling the bottom of the micro-well to the limestone stratum, namely the earthquake propagation high-speed stratum corresponding to the outcrop points A and B of the stratum. The exposed position coordinates of the bedrock layer at the bottom of the alluvial belt at the two lateral sides of the alluvial belt are respectively A (E A ，N A ，Z A )、B(E B ，N B ，Z B ) The formation production data includes a strike line AB of the earth's outcrop formation determined by the coordinates of points a and B. In order to enable the AB to form a trend line of the ground surface outcrop stratum, under the condition that the A, B coordinate connecting line is not parallel to the horizontal plane, the coordinates of the point A and/or the point B can be subjected to elevation compensation, and the trend line AB parallel to the horizontal plane is obtained.
In addition, the bottom hole coordinates F (E 0 ，N 0 ，Zh 0 ) =f (500000, 3900000, 75), F is P 0 Horizontal projection at the bedrock layer top interface; determining coordinates P (E, N, Z) of a planned drilling point near a micro-logging wellhead, wherein the coordinates are shot coordinates of a seismic exploration and observation system; and determining a projection point P' (E, N, zh) of a planned drilling point P (E, N, Z) of the seismic exploration well on a top interface of the bedrock layer, namely, the bottom hole coordinates of the seismic exploration well. In this embodiment, the starting scale of the Z axis is 75, which corresponds to the point F, and similarly, the starting scales of the X axis and the Y axis also correspond to the point F.
2. Establishing a geometric model
As shown in fig. 3, the geometric model includes: a tilt line FA perpendicular to the strike line AB of the earth's outcrop formation, a tilt line BE parallel to and equal in length to the tilt line FA, a tilt rock level ABEF determined by E, F and the strike line AB of the earth's outcrop formation, a projected surface DCEF of the tilt rock level ABEF in a vertical direction on a horizontal plane passing through F, and plumb lines AD, BC. A. B, C, D forms a plumb plane ABCD that passes through the strike line AB of the open-end formation. In addition, FB forms an observation direction line, and plane BEC and plane FAD form over-tilt lines E, respectively B A vertical plane passing through the inclined line FA.
In the field data acquisition, the rock layer surface shown in fig. 2 is represented by the inclined rock layer surface ABEF shown in fig. 3, and straight lines AB and EF in the line segment and angle attribute shown in fig. 2 are the trend lines of the rock layer shown in fig. 2, FA and E B The rays DF and CE are inclined lines FA and E, respectively B The projections on the horizontal plane, DF and CE, are expressed as formation tendencies.
In FIG. 3, point M is the intersection of trend CE and the X-axisIn the horizontal plane MFK, plane BEC and plane FAD are cross sections perpendicular to the line AB, and plane BFC is any cross section oblique to the line AB, Δe B C and Δfbc are right triangles with a common side BC.
The azimuth angle is an angle of the initial line in the north direction, which is deviated clockwise, and is input into the bedrock stratum inclined line FAI.e. 30 ° north-east, the azimuth angle of the inclined line FA differs from the azimuth angle of the formation strike line AB by 90 °. Input micro-logging wellhead coordinate P 0 (E 0 ，N 0 ，Z 0 ) And microlog bottom hole point F (E 0 ，N 0 ，Zh 0 )，F(E 0 ，N 0 ，Zh 0 ) Is P 0 Projection of the point at the formation top interface location. Inputting the exposed position coordinates B (E B ，N B ，Z B )＝B(500100，3900075，90)。
3. Calculating azimuth angle eta and apparent inclination angle beta corresponding to observation direction line FB
As shown in fig. 3: the observation direction line FB is a connecting line of the micro-logging underground bedrock point F and the rock layer exposed position B, the included angle eta= and the angle MFC of the horizontal projection FC of the observation direction line FB and the X axis (forward eastern direction), and the view inclination angle corresponding to the observation direction line FB is the included angle beta= and the angle BFC of the horizontal projection FC of the observation direction line FB and the observation direction line.
3.1 calculating the azimuth angle eta corresponding to the observation direction line FB
Alfa＝(E B －E 0 )/sqrt[(E B －E 0 )*(E B －E 0 )+(N B －N 0 )*(N B －N 0 )]
＝(500100－500000)/sqrt[(500100－500000)*(500100－500000)+(3900075－3900000)*(3900075－3900000)]
＝100/125＝0.8
In the formula, alfa is a trigonometric function value, and if the horizontal projection FC of the observation direction line FB is in one quadrant or two quadrants, N B －N 0 >=0, η=arccosalfa; if FC is in three quadrantsOr four quadrants, η=180+arccosalfa.
1000075-1000000>0 in this example, η=arccoss (0.8) =36.87°.
3.2 calculating the viewing angle beta corresponding to the observation direction line FB
As shown in fig. 3, the viewing angle β= b < BFC corresponding to the viewing direction line FB.
BC＝Z B －Zh 0 ＝90－75＝15，
FC＝sqrt[(E B －E 0 )*(E B －E 0 )+(N B －N 0 )*(N B －N 0 )]
＝sqrt(100*100+75*75)
＝125
tan (β) =bc/fc=15/125=0.12, and an arctangent is taken to obtain a viewing angle β.
4. Calculating an included angle theta between a trend line AB of the ground surface outcrop stratum and a horizontal plane projection FC of an observation direction line FB
As shown in fig. 3:
the included angle between the stratum trend line AB and the horizontal projection FC of the observation direction line FB is theta= < DCF-
Sin(θ)＝cos(ω－η)＝cos(60－36.87)＝0.92。
In the middle ofOmega is the angle between the horizontal projection FD of the formation inclined line FA and the forward direction, eta is the azimuth angle corresponding to the observation direction line FB, +.>Is the azimuth angle of the bedrock stratum inclined line.
5. Calculating true dip angle alpha of rock stratum
As shown in fig. 3: the true dip angle of the rock stratum is alpha= < BEC >, and is obtained by tan (beta) = sin (theta) < tan (alpha)
tan (α) =tan (β)/sin (θ) =0.12/0.92=0.13, and an arctangent is taken to be α=7.43 degrees.
6. Calculating the design well depth of the slope zone by adopting normal vector equation of inclined rock face
6.1 calculating the normal vector N (A, B, C) of the inclined rock face
A＝sin(α)cos(ω)＝sin(7.43)cos(60)＝0.064；
B＝sin(α)sin(ω)＝sin(7.43)sin(60)＝0.111；
C＝cos(α)＝cos(7.43)＝0.991；
Wherein A, B, C is a normal vector parameter.
Due to omega andalternatively, in other embodiments, it is also possible to pass +.>The normal vector N (a, B, C) of the inclined rock face is calculated.
6.2 calculating the designed well depth h of the slope zone area by using normal vector equation of the inclined rock face
Pass point F (E) 0 ，N 0 ，Zh 0 ) The normal vector equation for =f (500000, 3900000, 75) is:
A(E－E 0 )+B(N－N 0 )+C(Zh－Zh 0 )＝0，
i.e. 0.064 (E-500000) +0.111 (N-3900000) +0.991 (Zh-75) =0;
inputting planned design well gun position coordinates P (E, N, Z) =p (500075, 3900050, 95) to obtain Zh values:
0.064(500075－500000)+0.111(3900050－3900000)+0.991(Zh－75)＝0
Zh＝64.55；
i.e. P '(500075, 3900050, 64.55), where P' is the projection of P onto the inclined rock level.
The well depth h=pp' =z-zh=10.45 meters at the planned well shot position P.
In the embodiment, the shallowest well depth of the slope zone is calculated, and the explosive column length is increased in field seismic exploration, so that the final field construction drilling depth is obtained.
Example 2 of a well depth design method for a alluvial seismic exploration well in the present invention:
this embodiment differs from embodiment 1 in that: in example 1, zh of the projected points P' (E, N, zh) of the planned drilling points P (E, N, Z) of the seismic exploration well on the base layer is calculated from the normal vector N (U, V, W) of the inclined formation face ABEF. In this embodiment, the Zh of P' (E, N, zh) is directly obtained by the computer according to the geometric model in the coordinate system.
Example 3 of a well depth design method for a alluvial seismic exploration well in the present invention:
this embodiment differs from embodiment 1 in that: in embodiment 1, the true dip angle α and the included angle ω of the base layer, the included angle θ between the horizontal plane projection CD of the trend line AB of the ground surface outcrop layer and the horizontal plane projection of the observation direction line FB, and the observation direction line azimuth angle η corresponding to the projection FC of the inclined line FB on the horizontal plane passing through the point F are all calculated according to trigonometric functions. In this embodiment, the angle may be directly measured by a computer according to a geometric model in a coordinate system.
In the above embodiment, the X-axis of the three-dimensional cartesian coordinate system corresponds to the forward direction of the actual geographic direction of the earth, and the Y-axis corresponds to the north direction of the actual geographic direction of the earth. In other embodiments, the X-axis and the Y-axis of the three-dimensional cartesian coordinate system may also correspond to other directions, for example, such that the X-axis is parallel to the direction line AB, and the actual geographic coordinates corresponding to the earth may be obtained through coordinate transformation.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A well depth design method of a slope zone seismic exploration well is characterized by comprising the following steps:
step one, determining wellhead coordinates P of micro-logging 0 (E 0 ，N 0 ，Z 0 ) Bottom hole coordinates of micro-logs F (E 0 ，N 0 ，Zh 0 ) Exposed position coordinates A (E) of bedrock layer at bottom of the alluvial zone on both lateral sides of the alluvial zone A ，N A ，Z A )、B(E B ，N B ，Z B ) And planned drilling points P (E, N, Z) for the seismic exploration well; the bottom hole coordinate F of the micro-logging is P 0 Horizontal projection at the bedrock layer top interface;
step two, a geometric model is established, wherein the geometric model comprises an inclined rock layer surface determined by an inclined line FA, an inclined line FB and an inclined line AB;
and thirdly, determining the well depth h=pp 'of the seismic exploration well with the projection point of the planned drilling point P (E, N, Z) of the seismic exploration well on the inclined rock surface as P' (E, N, zh).
2. The method of designing the well depth of a slope strip seismic exploration well according to claim 1, wherein a plane formed by X, Y axes in a coordinate system is parallel to AB and a tilt line FA defined by a point F is perpendicular to AB.
3. The method of designing the well depth of a alluvial seismic exploration well according to claim 2, wherein the geometric model in step two includes a tilt line BE parallel to and equal in length to the tilt line FA, the tilt rock level being formed by ABEF; step three, determining a normal vector N (U, V, W) of the inclined rock face ABEF according to the geometric model; and also includes the step of determining the point of failure according to the point of failure F (E 0 ，N 0 ，Zh 0 ) Normal vector equation U (E-E 0 )+V(N－N 0 )+W(Zh－Zh 0 ) The value of 0 is calculated as Zh, and determining the well depth h=pp' =z-Zh of the slope zone seismic exploration well.
4. A method of designing the well depth of a slope zone seismic exploration well according to claim 3, characterized in that the normal vector N (U, V, W) of the inclined rock level is calculated from the true dip α of the inclined rock level, the inclination FD of the inclined rock level ABEF and the angle ω of the X axis: u=sin (α) cos (ω), v=sin (α) sin (ω), w=cos (α).
5. The method according to claim 4, wherein the true dip angle α is calculated from the apparent dip angle β corresponding to the observation direction line FB, the angle θ between the horizontal plane projection CD of the AB and the horizontal plane projection of the observation direction line FB, and is calculated from tan (α) =tan (β)/sin (θ).
6. The method of claim 5, wherein the included angle θ is calculated from trigonometric functions based on a geometric model.
7. The method of designing a well depth of a seismic prospecting well for a slope area according to claim 6, wherein the angle θ is calculated from the angle ω and the azimuth angle η of the observation direction line corresponding to the projection FC of the inclination line FB on the horizontal plane passing through the point F according to sin (θ) =cos (ω - η).
8. The method for designing the well depth of a slope zone seismic exploration well according to any one of claims 4 to 7, wherein the included angle ω is the azimuth angle of the inclination FD corresponding to the inclined line FAAccording to->And (5) calculating to obtain the product.
9. The method of designing the well depth of a slope strip seismic exploration well according to any of claims 1 to 7, wherein the explosive column length is increased on the basis of PP' to obtain the final seismic exploration well depth in the field seismic exploration.
10. The method of designing the well depth of a permafrost seismic survey well according to any one of claims 1 to 7, wherein the directions of the X-axis and the Y-axis of the three-dimensional cartesian coordinate system corresponding to each coordinate point coincide with the respective actual geographic directions of the earth.
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