Horizontal well steering method based on multi-disciplinary interactive corroboration

Abstract

The disclosed horizontal well guiding method based on multi-disciplinary interaction verification can effectively ensure the successful implementation of the horizontal well in view of the complex geological features such as the heterogeneity of the detrital rock reservoir and the lateral change of the gas layer. In the horizontal well targeting stage, the important adjustment nodes and the reasonable inclination angles thereof are determined, various vertical positioning methods are applied, the step-by-step accurate control of different node positions is realized, and the accurate targeting of the horizontal well is guided and realized. In the horizontal section implementation stage, the deposition model, the three-dimensional seismic model and the three-dimensional geological model of the horizontal section are used to guide the drilling of the horizontal well, and the macroscopic prediction of the seismic targeting and the fine regulation and control of the geological model are realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of horizontal well development of tight sandstone gas reservoirs, and particularly relates to a horizontal well guiding method based on multidisciplinary interactive verification. BACKGROUND

[0002] The conventional horizontal well geosteering technology is a technology for monitoring and controlling the trajectory of a horizontal well bore on the basis of comprehensive geology research, based on the logging-while-drilling curve, in combination with comprehensive mud logging and gas logging data. The horizontal well drilling process generally causes great difficulty to the field geology and mud logging work, and various factors can reduce the acquisition quality of mud logging data, the lithology and oil and gas layer coincidence rate, and weaken the geosteering effect of the field mud logging on the drilling construction.

[0003] For the horizontal well drilling of tight sandstone gas reservoirs, the reservoirs are generally thin and multi-layered, and the internal structure is complex. Whether the field geosteering method applied to the horizontal well is appropriate is directly related to the success or failure of the horizontal well. At the same time, the traditional geosteering of the tight sandstone gas reservoir has many difficulties, such as the lack of obvious and stable marker layer, the strong heterogeneity of the target layer reservoir, the multiple mudstone interlayers, the untimely and mixed return of the horizontal section cuttings, the difficulty in judging the actually drilled stratum, the easy collapse of the mudstone, the large friction, and the greater difficulty in the implementation of the long horizontal section. However, due to the constraints of the early concepts, the current geosteering technology is relatively single, and the spatial changes of the reservoir are not fully considered, so that the geosteering has multiple solutions and great uncertainty. The horizontal well is drilled in advance, the number of sidetracking is increasing, and the development effect needs to be further improved.

[0004] Due to the restrictions of the surface and reservoir conditions, the difficulty of gas field development is increasing year by year. The current development object of the gas field is mainly the tight sandstone gas reservoir, which generally develops multiple thin layers and has strong reservoir heterogeneity and multiple mudstone interlayers. The accuracy of the field geosteering of the horizontal well directly affects the development effect of the horizontal well. In order to guarantee the drilling effect of the horizontal well and improve the production capacity of the single well, it is necessary to continuously improve the horizontal well guiding technology. The horizontal well guiding is a very purposeful system engineering, which needs the joint research work of geology, seismic, drilling, mud logging, logging and other professions, timely sharing of data, multi-angle tracking analysis, deep fusion of multiple data and thoughts, integration of discipline advantages, clear adjustment direction of the well trajectory, concentrated decision-making, common guidance of the horizontal well drilling, and improvement of the single well reservoir drilling effect. SUMMARY

[0005] The application aims to provide a horizontal well guiding method based on multidisciplinary interactive verification, and solve the problem of low accuracy of the existing field geosteering of the horizontal well.

[0006] The technical scheme adopted by the application is as follows: The horizontal well guiding method based on multidisciplinary interactive verification comprises the following steps:

[0007] Step 1, a plurality of regional marker layers are selected, hierarchical fine stratum correlation is carried out to obtain a stratum correlation diagram, and actual drilled horizons and thicknesses and vertical depths thereof are obtained;

[0008] Step 2, according to the actual drilled horizons and thicknesses and vertical depths thereof obtained in Step 1, different well inclination angles are taken as control nodes, a vertical positioning method is applied to control the vertical positioning result in stages, the predicted target point vertical depth is continuously corrected, and the well inclination angle is adjusted to accurately target;

[0009] Step 3, a sedimentary model of horizontal section guidance is established according to the stratum correlation diagram obtained in Step 1 and the actual targeted point position in Step 2, and the sedimentary model is used to describe the types, thicknesses and extension distances of internal interbeds in the target layer section;

[0010] Step 4, a three-dimensional seismic model is established by taking the stratum correlation diagram obtained in Step 1 and the vertical positioning result in Step 2 as constraint conditions, seismic reflection waves are accurately homed by pre-stack depth migration processing, and reservoir development characteristics of the target layer are predicted by using pre-stack inversion results;

[0011] Step 5, in combination with the stratum correlation diagram obtained in Step 1 and the vertical positioning result in Step 2, and on the basis of the reservoir development characteristics obtained in Step 4, quantitative sand body characterization is carried out to obtain the width-thickness ratio, thickness, length and dip angle of the sand body, a reservoir geological knowledge base is established, and a three-dimensional geological model is constructed;

[0012] Step 6, the horizontal well drilling is guided by using the sedimentary model obtained in Step 3, the three-dimensional seismic model obtained in Step 4 and the three-dimensional geological model obtained in Step 5.

[0013] The application also has the characteristics that,

[0014] The marker layers selected in Step 1 are selected in the strata after the Hercynian tectonic movement, the thicknesses of the Permian strata between the plurality of marker layers are corrected by using the decompaction correction value, the top marker layer is 200 meters away from the target layer, and the bottom marker layer is 30-40 meters away from the target layer.

[0015] The control nodes in Step 2 include well inclination angles of 10°, 30°, 45°, 60°, 70°, 80° and 83°; the accurate targeting is to ensure that the targeted point is located in the gas-bearing sand body of the target layer, and the well inclination angle is adjusted to 89.5° to 90°.

[0016] The vertical positioning method in Step 2 includes stratum thickness comparison, marker layer lithology identification, drilling description and drilling logging analysis.

[0017] The sedimentary model established in Step 3 is established by using the relationship between basin stratum sedimentation construction and sedimentary facies, on the basis of regional geological sedimentary environment analysis, by using the facies sequence change rule to establish a local regional sedimentary model, and by continuously correcting the sedimentary model by using the horizontal well drilling measurement data and logging data.

[0018] The type of the internal interlayer in the target layer section in step 3 is determined according to the color, gamma, thickness and drilling time of the drilled mudstone. When the interlayer is drilled, the gamma curve changes suddenly, showing a box type, the value is greater than 180 API, the drilling time is 20 min / m to 40 min / m, and the color is gray to dark gray. At this time, a large inclination adjustment is taken to track and replace the gas layer. When the mudstone interlayer is drilled, the gamma curve type is gradually changed and shows a sharp shape, the value is less than 150 API, the drilling time is 5 min / m to 10 min / m, and the color is light gray to gray. At this time, fine adjustment or no adjustment is taken to quickly drill through the mudstone interlayer.

[0019] The pre-stack inversion in step 4 is specifically: continuously adding new drilled well data during drilling, establishing a velocity field to realize the conversion from the time domain to the depth domain of three-dimensional seismic, and then establishing a depth domain seismic model of the main target layer section under the control of drilling geology stratification data and interpreted horizon.

[0020] The reservoir development characteristics obtained in step 4 include spatial morphology, structural relief, development scale, physical property and gas content.

[0021] The quantitative sand body characterization in step 5 is specifically: analyzing the sandstone and mudstone fabric characteristics of the horizontal well, performing hierarchical description of composite channel sand bodies-single channel sand bodies-internal accretion bodies, and describing the scale from 15m thick composite sand bodies to 5m thick thin sand bodies, and predicting the channel sand body distribution morphology and development scale.

[0022] In step 6, the sedimentary model obtained in step 3 is used to describe the sand body sedimentary facies, interlayer type, thickness and extension scale for guidance, the three-dimensional seismic model obtained in step 4 is used to predict the structural relief and sand body spatial development position for guidance, and the three-dimensional geological model obtained in step 5 is used to describe the lithological boundary and physical property boundary for guidance, so that the horizontal well drilling meets the following quantitative indexes: 1) the success rate of horizontal well entering the target is 100%, and the vertical depth error is within ±5m of the design; 2) the length of the horizontal section reaches the designed geological purpose; 3) the sandstone drilling rate of the horizontal section is greater than 80%; 4) the gas layer drilling rate of the horizontal section is greater than 60%; 5) there is no sidetracking phenomenon due to the failure of the guidance decision of the horizontal well; 6) the well trajectory parameters of the horizontal section meet the engineering design requirements.

[0023] The beneficial effect of the present application is that the horizontal well guiding method based on multi-disciplinary interactive verification can effectively ensure the successful implementation of the horizontal well in view of the complex geological features such as the heterogeneity of the detrital rock reservoir and the lateral variation of the gas layer. In the horizontal well targeting stage, the important adjustment nodes and the reasonable inclination angles thereof are determined, a plurality of vertical positioning methods are applied, the step-by-step accurate control of different node positions is realized, and the accurate targeting of the horizontal well is guided and realized; in the horizontal section implementation stage, the deposition model, the three-dimensional seismic model and the three-dimensional geological model of the horizontal section are used to guide the drilling of the horizontal well, and the macroscopic prediction of the seismic targeting and the fine regulation and control of the geological model are realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a flowchart of the horizontal well guiding method based on multi-disciplinary interactive verification of the present application;

[0025] Figure 2 is a schematic diagram of three models established in embodiment 1 of the horizontal well guiding method based on multi-disciplinary interactive verification of the present application;

[0026] Figure 3 is a schematic diagram of three models established in embodiment 2 of the horizontal well guiding method based on multi-disciplinary interactive verification of the present application;

[0027] Figure 4 is a schematic diagram of three models established in embodiment 3 of the horizontal well guiding method based on multi-disciplinary interactive verification of the present application;

[0028] Figure 5 is a schematic diagram of three models established in embodiment 4 of the horizontal well guiding method based on multi-disciplinary interactive verification of the present application. DETAILED DESCRIPTION

[0029] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0030] The present application provides a horizontal well guiding method based on multi-disciplinary interactive verification, as shown in Figure 1 The method comprises the following steps:

[0031] 1) The drilling, logging and well logging data of the skeleton control well are used to perform the hierarchical fine stratigraphic division and correlation of the Shiqianfeng and Shihedzhu groups, establish a standard stratigraphic profile, select a plurality of typical marker layers with obvious litho-electric characteristics, the marker layers are preferably selected in the strata after the Hercynian tectonic movement, the thickness of the Permian strata between the plurality of marker layers is corrected by using the decompaction, the top marker layer is preferably about 200 meters away from the target layer, the bottom thick sandstone of the Shiqianfeng bottom section of the Upper Paleozoic is generally selected, the ideal distance of the bottom marker layer from the target layer is 30-40 meters, the bottom coarse sandstone of the He7 or the top mudstone of the He8 is generally selected, and the thickness and vertical depth of different sections are determined.

[0032] 2) According to the same electrical characteristics of overlying marker bed, less than 10m difference in thickness of the same period, and consistent with the vertical depth of the surrounding well points, the important nodes of the inclination adjustment of the target stage well are set; in the implementation process of the deviated well section, four vertical positioning methods of stratum thickness comparison, marker bed lithology identification, mud logging description while drilling, and logging analysis while drilling are applied, according to the comparison results of the marker bed, the target point vertical depth and the wellbore trajectory of the predicted target layer are predicted, seven stage control nodes of 10°, 30°, 45°, 60°, 70°, 80°, and 83° are set from top to bottom, the predicted target point vertical depth is constantly corrected, the reasonable inclination angle is timely adjusted, the target point is ensured to be located in the development position of the gas-bearing sand body of the target layer, and the inclination is adjusted to 89.5° to 90°, so as to realize the accurate target entry.

[0033] 3) The drilling, logging, mud logging, and core description data of the horizontal well surrounding control skeleton well are used to carry out profile comparison analysis and plane fine description, the plane profile is consistent, the sedimentary microfacies type and distribution characteristics of the design target layer of the horizontal well are described, and the sand-shale facies combination characteristics drilled by the horizontal section are described, so as to establish a sedimentary model, identify the sedimentary facies of the sand body, the type, thickness, and extension scale of the interlayer.

[0034] Among them, the establishment of the sedimentary model is to use the relationship between the stratum sedimentation and the sedimentary facies, on the basis of the regional sedimentary environment analysis, use the "facies sequence change rule" to establish the local regional sedimentary model, and constantly correct the sedimentary model by using the while-drilling data of the horizontal well, the drilled sandstone corresponds to the channel or point bar sedimentary microfacies, the mudstone corresponds to the interchannel or flood plain sedimentary microfacies, the less than 2m thin layer of mudstone developed in the sandstone is defined as the interlayer, and the graphic model is established based on the above knowledge, so as to ensure that the lithology and the sedimentary microfacies are consistent at a rate of 100%.

[0035] The identification of the interlayer type is to judge whether it is an interlayer or an internal interlayer according to the color, while-drilling gamma, drilling time, and thickness of the drilled mudstone, when the interlayer is drilled, it is generally a horizontal facies change mudstone or a vertical different period layer system sand body thick layer mudstone (more than 2m), the while-drilling gamma curve will change suddenly, showing a box type, the value is relatively high (generally more than 180 API), the drillability is relatively poor (drilling time is 20min / m to 40min / m), the color is gray to dark gray, at this time, a large inclination adjustment is taken to track the replacement gas layer; when the mudstone interlayer is drilled, the while-drilling gamma curve type is generally gradual and sharp, the value is relatively low (generally less than 150 API), the thickness is less than 2m, and the drillability is relatively good (drilling time is 5min / m to 10min / m), the color is light gray to gray, at this time, fine adjustment or no adjustment is taken to quickly drill through the mudstone interlayer.

[0036] 4) Using three-dimensional seismic data to carry out target processing and interpretation, using micro-logging constrained tomographic static correction technology to provide data basis for fine description of small amplitude structural gas reservoir, using near-surface Q compensation technology to further improve and improve the consistency and resolution of data, using OVT domain anisotropic pre-stack migration technology to further improve the seismic imaging accuracy, focusing on micro-amplitude structure description, thin reservoir prediction, and fully improving the imaging accuracy and resolution of target layer. Using the well logging curve of the completed well, the seismic horizon is constrained, the wave impedance model is established, the forward analysis is carried out, the model forward result, the acoustic synthetic record and the VSP result are used to constrain and improve the resolution of the seismic data of the target layer. Fully consider the development characteristics of the stratum, lithology and structure in the region, establish a high-precision velocity model, and make multiple rounds of velocity correction combined with the latest geological understanding, and then obtain a relatively accurate velocity model, carry out target pre-stack depth migration, and accurately return the seismic reflection wave to improve the accuracy of small amplitude structure imaging, and then use high-precision pre-stack inversion to predict the spatial form, structure fluctuation, development scale, physical property, gas-bearing property and other reservoir development characteristics of the target layer.

[0037] Among them, the high-precision pre-stack inversion is specifically: during the implementation of horizontal well drilling, continuously adding the geological stratification, logging and field data of the newly completed well in the three-dimensional seismic area, under the constraint of well drilling geological stratification data and logging interpretation horizon, a higher precision velocity field is established, the three-dimensional seismic time domain is accurately converted to depth domain, the coincidence rate of the stratification and logging interpretation results of the completed well is ensured to be more than 90%, a reliable depth domain seismic gas reservoir model of the main target layer is established, and then a sandstone probability body model is established, the spatial distribution characteristics of the sandstone of the target layer are predicted by using the model, and the porosity, permeability and gas saturation of the well logging interpretation are further combined to establish a porosity, permeability and gas saturation probability data model.

[0038] 5) Based on the spatial form, structure fluctuation, development scale, physical property and gas-bearing property of the target layer predicted by three-dimensional seismic, carry out reservoir architecture analysis, quantitative sand body characterization under the constraint of horizontal well data, establish reservoir geological knowledge base of the target layer, and construct a relatively fine three-dimensional geological model based on the reservoir geological knowledge base.

[0039] Among them, the quantitative sand body characterization under the constraint of horizontal well data is specifically: in view of the limitations of interwell prediction of traditional river facies sand body quantitative characterization method, a large amount of horizontal well data is used to carry out research on structure fluctuation, reservoir sand body internal structure and different order sand body identification of the target layer, describe the sand and mudstone fabric characteristics of the horizontal well on the profile, carry out hierarchical description of "composite channel sand body (5th architecture unit)-single channel sand body (4th architecture unit)-internal accretion body (3rd architecture unit)", describe the fine thin layer sand body from 15m thick composite sand body to 5m thick thin layer sand body, and fine predict the distribution form and development scale of channel sand body.

[0040] The establishment of the reservoir geological knowledge base specifically includes: based on the quantitative characterization results of the tight sandstone gas reservoirs in different blocks, performing geostatistical analysis, and determining the thickness, width, length, dip angle, and drilling rate parameters of different reservoir configuration units.

[0041] The construction of the fine three-dimensional geological model specifically includes: taking the reservoir geological knowledge base as the constraint condition, fully utilizing the sedimentary facies and sand body thickness hard data to perform deterministic modeling, and combining the inversion sandstone probability body model to organically combine deterministic modeling and random modeling, thereby reducing the multi-solution nature of the prediction; comprehensively establishing a three-dimensional geological data model by grading the sedimentary facies model and the lithofacies model, comprehensively utilizing the three-dimensional seismic sandstone and gas-bearing probability body data model for constraint, achieving a coincidence degree of more than 90% between the geological research understanding, the seismic prediction results, and the well point drilling data, and finally establishing a high-precision three-dimensional geological data model based on the constraint of the seismic, geological, logging, and mud logging data.

[0042] 6) During the implementation of the horizontal section, sedimentary model guidance, three-dimensional seismic guidance, and three-dimensional modeling guidance are respectively carried out, mainly utilizing the sedimentary model to describe the sedimentary facies, interlayer type, thickness, and extension scale of the sand body for guidance, mainly utilizing the three-dimensional seismic model to predict the structural relief and the spatial development position of the sand body for guidance, and mainly utilizing the three-dimensional geological model to describe the lithological boundary and the physical property boundary for fine control. The sedimentary geological model has the advantage of being able to closely combine the fine correlation results of the actual drilling small layers, and real-time correct and track the model according to the drilling and logging data, so as to realize the accurate targeting of the horizontal well, and also to clearly determine the sedimentary facies type of the horizontal section and determine whether the lithology of the horizontal section changes. The three-dimensional seismic data is the continuous reflection acoustic wave data of the real underground geological body, and is the real reflection of the underground formation information, which can distinguish the composite channel limits and judge the relative position of the advantageous sand body. The three-dimensional seismic probability body model can provide macroscopic direction control, has good prediction and guidance for the horizontal section guidance, and can effectively avoid sidetracking. The three-dimensional geological modeling is the comprehensive display of the seismic and geological result data, which can finely depict the structural and sandstone distribution characteristics in the three-dimensional space, comprehensively predict the lithological boundary point and the physical property boundary point of the horizontal section to be drilled, guide the fast drilling of the horizontal section, and is also the key to obtaining good reservoir drilling results. During the targeting of the horizontal well, the geological layer fine division and correlation are mainly strengthened, the three-dimensional seismic is mainly used to implement the targeting point and the target body space, during the drilling of the horizontal section, the three-dimensional seismic is mainly used to predict the advantageous reservoir sand body development position, the geological fine description and analysis of the lithology and gas-bearing property change characteristics of the horizontal section are mainly used, and real-time analysis and adjustment are carried out during the drilling process, which should meet the following quantitative indicators:

[0043] (1) The success rate of the horizontal well once targeting is 100% (the vertical depth of the targeting is within ±5m of the design error);

[0044] (2) The length of the horizontal section reaches the design geological purpose;

[0045] (3) The drilling rate of sandstone in the horizontal section is greater than 80%;

[0046] (4) The drilling rate of gas-bearing layers in the horizontal section is greater than 60%;

[0047] (5) No horizontal wells have ever been selected for sidetracking due to directional decision-making errors;

[0048] (6) The trajectory parameters of the horizontal section of the well meet the engineering design requirements.

[0049] Through the above methods, the horizontal well steering method based on multidisciplinary cross-verification of the present invention has been applied on a large scale in the past two years, with a target success rate of over 98%, a measured horizontal section length of 1440m, a sandstone drilling encounter rate of 86.2%, a gas layer drilling encounter rate of 70%, and 232 wells have obtained high-yield industrial gas flow in the Shangguhe 8 and Shan 1 gas layer sections, reducing sidetracking and ineffective footage, and saving a lot of money.

[0050] Example 1

[0051] like Figure 2 As shown, in the horizontal well guidance process of typical Well 1, the use of the skeleton well for detailed comparison and segmentation of sand bodies describes the internal structure and lithological changes of the sand bodies. Minor adjustments were made to the well inclination of the horizontal section to ensure drilling within the target sand body. Gas logging in the horizontal section was promptly reduced by 0.5 degrees to decrease the well inclination. A 3D seismic model was used to describe the geological structure and the location of dominant sand bodies, allowing for two significant downward adjustments to the horizontal section trajectory, effectively avoiding ineffective drilling footage and sidetracking. A 3D geological model was used to describe lithological boundaries, physical property boundaries, and sweet spot development areas, enabling timely optimization of the horizontal section trajectory design and well inclination settings, achieving efficient and rapid drilling in the horizontal section. The completed horizontal section of this well was 5256m long, with a sandstone encounter rate of 97.6%, a gas layer encounter rate of 71.0%, and an open flow rate of 2.205 million cubic meters per day.

[0052] Example 2

[0053] like Figure 3 As shown, in the horizontal well guidance process of typical Well 2, the use of the skeleton well for detailed comparison and segmentation of sand bodies describes the internal structure and lithological changes of the sand bodies, depicts the distribution of interlayers, and avoids encountering interlayers in the horizontal section, achieving drilling within the target layer in the horizontal section. The 3D seismic model describes that the structural changes are not significant, and the elevation of the dominant sand body development location along the horizontal section direction increases. The horizontal section trajectory is selected with a well inclination of 90.5-91 degrees to effectively avoid drilling through the target layer sand body. The 3D geological model is used to describe the lithological boundaries, physical property boundaries, and sweet spot development areas, and the horizontal section trajectory design and well inclination settings are optimized in a timely manner to ensure smooth drilling in the horizontal section within the sweet spot area. If the physical properties deteriorate when drilling, the well inclination is adjusted to 91 degrees. The completed horizontal section of this well is 3321m long, with a reservoir drilling rate of 100%, a gas layer drilling rate of 93.3%, and an open flow rate of 3.207 million cubic meters per day.

[0054] Example 3

[0055] As shown in Figure 4 Typical well 3, in the process of horizontal well steering, uses skeleton well fine correlation and sand body division to establish a sedimentary model to describe sand body lateral variation. The thickness of the sand body in the starting well is relatively thin, and after entering the target, the hole inclination is adjusted to 90 degrees for smooth drilling to realize horizontal drilling in the target sand body. The three-dimensional seismic model describes a gentle structure, and the horizontal section target sand body is obviously thickening downward. The horizontal section trajectory is selected to drill at a hole inclination of about 89 degrees to realize the horizontal section in the middle of the target sand body. The three-dimensional geological model describes the lithological boundary, physical property boundary and sweet spot development area to segment and refine the horizontal section trajectory design and hole inclination angle to ensure smooth drilling of the horizontal section in the sweet spot area. If the physical property is poor, the hole inclination is adjusted to 89 degrees for implementation. The horizontal section of the well is 4118m long, the reservoir drilling rate is 99.3%, the gas layer drilling rate is 79.7%, and the open flow capacity is 2.622 million cubic meters per day.

[0056] Example 4

[0057] As shown in Figure 5 Typical well 4, in the process of horizontal well steering, uses skeleton well fine correlation and sand body division to establish a sedimentary model to describe different period sand body lateral variation. The top of the target layer does not contain gas, and the middle and lower parts of the target sand body are selected to enter the target to realize horizontal drilling in the target gas-containing sand body. The three-dimensional seismic model describes a gentle structure, and the sand body has good continuity. The horizontal section trajectory is selected to drill at a hole inclination of about 90 degrees to realize fast drilling of the horizontal section. The three-dimensional geological model describes the physical property boundary and sweet spot development area to timely fine-tune the hole inclination angle to ensure smooth drilling of the horizontal section in the sweet spot area. The horizontal section of the well is 3500m long, the sandstone drilling rate is 97.3%, the effective reservoir drilling rate is 88.2%, and the open flow capacity is 2.837 million cubic meters per day.

Claims

1. A method for horizontal well steering based on multi-disciplinary interactive corroboration, characterized in that, The method comprises the following steps: Step 1, selecting multiple regional marker layers, performing hierarchical fine stratum correlation to obtain a stratum correlation diagram, and obtaining actual drilled horizons and thicknesses and vertical depths; Step 2, taking different well inclination angles as control nodes, applying a vertical positioning method to control the vertical positioning result step by step, constantly correcting the vertical depth of a predicted target point, and adjusting the well inclination angle to accurately target; Step 3, establishing a horizontal section guiding sedimentary model, and using the sedimentary model to describe the types, thicknesses and extension distances of internal interbedded layers in a target layer section; Step 4, establishing a three-dimensional seismic model, making seismic reflection waves accurately home by prestack depth migration processing, and using prestack inversion results to predict reservoir development characteristics of the target layer; Step 5, performing quantitative sand body characterization to obtain the width-thickness ratio, thickness, length and dip angle of the sand body, establishing a reservoir geological knowledge base, and guiding the construction of a three-dimensional geological model; Step 6, using the sedimentary model, the three-dimensional seismic model and the three-dimensional geological model to guide horizontal well drilling.

2. The method for horizontal well steering based on multi-disciplinary interactive corroboration of claim 1, wherein, The marker layers selected in the step 1 are selected in strata after the Hercynian tectonic movement, the thicknesses of Permian strata between the multiple marker layers adopt decompaction correction values, the top marker layer is 200 meters away from the target layer, and the bottom marker layer is 30-40 meters away from the target layer.

3. The method for horizontal well steering based on multi-disciplinary interactive corroboration of claim 1, wherein, The control nodes in the step 2 include well inclination angles of 10°, 30°, 45°, 60°, 70°, 80° and 83°; the accurate targeting is to ensure that the target point is located in the internal gas-bearing sand body of the target layer, and the well inclination angle is adjusted to 89.5° to 90°.

4. The method for horizontal well steering based on multi-disciplinary interactive corroboration of claim 1, wherein, The vertical positioning method in the step 2 includes stratum thickness correlation, marker layer lithology identification, drilling logging description and drilling logging analysis.

5. The method for horizontal well steering based on multi-disciplinary interactive corroboration of claim 1, wherein, The sedimentary model established in the step 3 is established by using the relationship between basin stratum sedimentation construction and sedimentary facies, on the basis of regional geological sedimentary environment analysis, using facies sequence change rules to establish a local regional sedimentary model, and constantly correcting the sedimentary model by using horizontal well drilling measurement data and logging data.

6. The method for horizontal well steering based on multi-disciplinary interactive corroboration of claim 1, wherein, The type of internal interbedded layers in the target layer section in the step 3 is determined according to the color, gamma, thickness and drilling time of drilled mudstone to determine whether an interlayer or internal interbedded layer is drilled, when the interlayer is drilled, the drilling gamma curve changes suddenly, is box-shaped, the value is greater than 180 API, the drilling time is 20-40 min / m, and the color is gray-dark gray, at this time, a large inclination adjustment is taken to track and replace the gas layer; when the mudstone interbedded layer is drilled, the drilling gamma curve is gradually changed and is sharp, the value is less than 150 API, the drilling time is 5-10 min / m, and the color is light gray-gray, at this time, fine adjustment or no adjustment is taken to quickly drill through the mudstone interbedded layer.

7. The multi-disciplinary interactive corroboration based horizontal well steering method of claim 1, wherein, The prestack inversion in the step 4 is specifically: constantly adding new drilled well data in the drilling process, under the control of drilling geological stratification data and interpreted horizons, establishing a velocity field to realize the conversion from the three-dimensional seismic time domain to the depth domain, and further establishing a depth domain seismic model of the main target layer section.

8. The multi-disciplinary interactive corroboration based horizontal well steering method of claim 1, wherein, The reservoir development characteristics obtained in the step 4 include spatial form, structural relief, development scale, physical property and gas-bearing property.

9. The multi-disciplinary interactive corroboration based horizontal well steering method of claim 1, wherein, The quantitative sand body characterization in step 5 is specifically: analyzing the sandstone and mudstone fabric features of the horizontal well, performing hierarchical description of the composite channel sand body-single channel sand body-internal accretion body, and describing the scale from the 15m thick layer composite sand body to the 5m thick thin layer sand body, and predicting the channel sand body distribution pattern and development scale.

10. The multi-disciplinary interactive corroboration based horizontal well steering method of claim 1, wherein, In step 6, the sand body sedimentary facies, interlayer type, thickness and extension scale obtained in step 3 are used for guidance, the structure relief and sand body spatial development position predicted by the three-dimensional seismic model obtained in step 4 are used for guidance, and the lithological boundary and physical property boundary described by the three-dimensional geological model obtained in step 5 are used for guidance, so that the horizontal well drilling meets the following quantitative indexes: 1) the one-time target entering success rate of the horizontal well is 100%, and the target entering vertical depth is within ±5m of the design error; 2) the horizontal section length reaches the design geological purpose; 3) the sandstone drilling rate of the horizontal section is greater than 80%; 4) the gas layer drilling rate of the horizontal section is greater than 60%; 5) there is no sidetracking phenomenon due to the guidance decision error of the horizontal well; and 6) the horizontal section well trajectory parameters meet the engineering design requirements. ​

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