Horizontal well guiding method based on multidisciplinary interactive verification

Abstract

According to the horizontal well guiding method based on multidisciplinary interaction verification, successful implementation of the horizontal well can be effectively ensured according to complex geological characteristics such as heterogeneity of clastic rock reservoirs and transverse changes of gas layers. In the target entering stage of the horizontal well, important adjusting nodes and reasonable well inclination angles are determined, multiple vertical positioning methods are applied, step-by-step accurate control over different node positions is achieved, and accurate target entering of the horizontal well is guided and achieved. In a horizontal section implementation stage, horizontal well drilling is guided by using a horizontal section guided sedimentary model, a three-dimensional earthquake model and a three-dimensional geologic model, so that earthquake targeted macroscopic prediction and fine regulation and control of the geologic model are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of horizontal well development of tight sandstone gas reservoirs, and in particular relates to a horizontal well steering method based on multidisciplinary interactive verification. Background Art

[0002] Conventional horizontal well geosteering technology is a technology that monitors and controls the borehole trajectory of horizontal wells based on comprehensive geological research, logging while drilling curves, and combined with comprehensive logging and gas logging data. Horizontal well drilling technology generally causes great difficulties for on-site geological logging work. Various factors will reduce the acquisition quality of logging data, lithology and oil and gas layer compliance, and weaken the geological guidance effect of on-site logging on drilling construction.

[0003] For horizontal well drilling in tight sandstone gas reservoirs, the reservoirs are generally thin and multi-layered, with complex internal structures. Whether the horizontal well field geosteering method is applied appropriately is directly related to the ultimate success of the horizontal well. At the same time, there are many difficulties in the traditional geosteering of tight sandstone gas reservoirs, including the lack of obvious and stable marker layers, strong heterogeneity of the target layer reservoir, many mudstone interlayers, untimely and mixed rock cuttings in the horizontal section, and difficulty in judging the actual drilling formation; mudstone is easy to collapse and has high friction resistance, especially in long horizontal sections. However, due to the constraints of early concepts, the current geosteering technology is relatively simple and does not fully consider the spatial changes of the reservoir, making the geosteering multi-solution and highly uncertain. The number of horizontal wells completed in advance and side drilling is increasing, and the development effect needs to be further improved.

[0004] Due to the limitations of ground and reservoir conditions, the difficulty of gas field development increases year by year. Today's gas field development targets are mainly tight sandstone gas reservoirs, whose reservoirs generally have many thin layers, strong reservoir heterogeneity, and many mudstone interlayers. The accuracy of horizontal well field geological guidance directly affects the development effect of horizontal wells. In order to ensure the drilling effect of horizontal wells and improve the production capacity of single wells, it is necessary to continuously improve the level of horizontal well guidance technology. Horizontal well guidance is a highly purposeful system engineering, which requires multiple disciplines such as geology, seismology, drilling, logging, and well logging to jointly carry out research work, share data in a timely manner, track and analyze from multiple angles, integrate multiple data and cross-thinking deep integration, integrate disciplinary advantages, clarify the direction of well trajectory adjustment, make centralized decisions, and jointly guide horizontal well drilling to improve the drilling effect of single well reservoirs. Summary of the invention

[0005] The purpose of the present invention is to provide a horizontal well steering method based on multidisciplinary interactive verification, which solves the problem of low accuracy of existing horizontal well field geological steering.

[0006] The technical solution adopted by the present invention is: a horizontal well steering method based on multidisciplinary interactive verification, comprising the following steps:

[0007] Step 1: Select multiple regional marker layers, perform graded and fine stratigraphic comparison to obtain a stratigraphic comparison map, and obtain the actual drilled layer, thickness, and vertical depth;

[0008] Step 2: Based on the actual drilled layer and its thickness and vertical depth obtained in step 1, different well inclination angles are used as control nodes, and the vertical positioning method is applied to control step by step with the vertical positioning results, and the predicted target vertical depth is continuously corrected, and the well inclination angle is adjusted for accurate target entry;

[0009] Step 3: Establish a sedimentation model for horizontal segment guidance based on the stratigraphic comparison map obtained in step 1 and the actual target point position in step 2, and use the sedimentation model to describe the type, thickness and extension distance of the interlayer inside the target layer;

[0010] Step 4: Establish a three-dimensional seismic model based on the stratigraphic comparison map obtained in step 1 and the vertical positioning result in step 2 as constraint conditions, accurately return the seismic reflection wave through prestack depth migration processing, and predict the reservoir development characteristics of the target layer using the prestack inversion result;

[0011] Step 5: Combine the stratigraphic comparison map obtained in step 1 and the vertical positioning result in step 2, and based on the reservoir development characteristics obtained in step 4, perform quantitative sand body characterization to obtain the width-to-thickness ratio, thickness, length and inclination of the sand body, establish a reservoir geological knowledge base, and guide the construction of a three-dimensional geological model;

[0012] Step 6: Use the sedimentation model obtained in step 3, the three-dimensional seismic model obtained in step 4, and the three-dimensional geological model obtained in step 5 to guide the horizontal well drilling.

[0013] The present invention is also characterized in that:

[0014] The marker layer selected in step 1 is located in the stratum after the Hercynian tectonic movement occurred. The thickness of the Permian strata between multiple marker layers adopts the de-compaction correction value. The top marker layer is 200 meters away from the target layer, and the bottom marker layer is 30 to 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°; precise targeting ensures that the target point is located inside 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 formation thickness comparison, marker layer lithology identification, while drilling logging description and while drilling logging analysis.

[0017] The sedimentary model established in step 3 is based on the relationship between the basin stratigraphic sedimentary structure and the sedimentary facies. On the basis of the regional geological sedimentary environment analysis, the local regional sedimentary model is established using the phase sequence transition law. At the same time, the sedimentary model is continuously revised using the horizontal well drilling measurement data and logging data.

[0018] The description of the internal interlayer type of the target layer in step 3 is based on the color, gamma, thickness and drilling time of the mudstone encountered to determine whether the interlayer or internal interlayer is encountered. When the interlayer is encountered, the gamma curve while drilling changes suddenly and becomes box-shaped, with a value greater than 180API, a drilling time of 20min / m to 40min / m, and a gray to dark gray color. At this time, a larger well inclination adjustment is adopted to track the substitute gas layer; when the mudstone interlayer is encountered, the gamma curve while drilling becomes gradual and spike-shaped, with a value less than 150API, a drilling time of 5min / m to 10min / m, and a light gray to gray color. At this time, fine-tuning or no adjustment is adopted to quickly drill through the mudstone interlayer.

[0019] The pre-stack inversion in step 4 is as follows: during the drilling process, new drilling data is continuously added, and under the control of drilling geological stratification data and interpreted layers, a velocity field is established to realize the conversion of three-dimensional seismic time domain to depth domain, and then a depth domain seismic model of the main target layer is established.

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

[0021] The quantitative sand body characterization in step 5 is as follows: analyzing the sand-shale fabric characteristics of horizontal wells, and performing a graded description of composite channel sand bodies, single channel sand bodies, and internal accretion bodies, with the description scale ranging from 15m thick composite sand bodies to 5m thick thin sand bodies, and predicting the distribution morphology of channel sand bodies and their development scale.

[0022] In step 6, the sedimentary model obtained in step 3 is used to describe the sedimentary phase, interlayer type, thickness and extension scale of the sand body for guidance, the three-dimensional seismic model obtained in step 4 is used to predict the structural undulation and the spatial development position of the sand body for guidance, and the three-dimensional geological model obtained in step 5 is used to describe the lithological boundary and physical boundary for guidance, so that the horizontal well drilling meets the following quantitative indicators: 1) the horizontal well has a 100% one-time target success rate, and the target vertical depth is within ±5m of the design error; 2) the horizontal section length meets 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) the horizontal well has no side drilling phenomenon due to wrong guidance decision; 6) the horizontal section wellbore trajectory parameters meet the engineering design requirements.

[0023] The beneficial effects of the present invention are as follows: the horizontal well guidance method based on multidisciplinary interactive verification can effectively ensure the successful implementation of horizontal wells in view of complex geological features such as heterogeneity of clastic reservoirs and lateral changes in gas layers. In the horizontal well targeting stage, important adjustment nodes and their reasonable well inclination angles are determined, and a variety of vertical positioning methods are applied to achieve step-by-step precise control of different node positions, guide and achieve precise targeting of horizontal wells; in the horizontal section implementation stage, the sedimentary model, three-dimensional seismic model and three-dimensional geological model guided by the horizontal section are used to guide the drilling of horizontal wells, achieving seismic targeted macroscopic prediction and fine control of geological models. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the process of the horizontal well steering method based on multidisciplinary interactive verification of the present invention;

[0025] Figure 2 Schematic diagrams of three models established in Example 1 of the horizontal well steering method based on multidisciplinary interactive verification of the present invention;

[0026] Figure 3 Schematic diagrams of three models established in Example 2 of the horizontal well steering method based on multidisciplinary interactive verification of the present invention;

[0027] Figure 4 Schematic diagrams of three models established in Example 3 of the horizontal well steering method based on multidisciplinary interactive verification of the present invention;

[0028] Figure 5 Schematic diagrams of three models established in Example 4 of the horizontal well steering method based on multidisciplinary interactive verification of the present invention. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The present invention provides a horizontal well steering method based on multidisciplinary interactive verification, such as Figure 1 As shown, the following steps are included:

[0031] 1) Using the drilling, logging and mud recording data of the skeleton control well, the Shiqianfeng and Shihezi formations are divided and compared, a standard stratigraphic section is established, and several typical marker layers with obvious rock electrical characteristics are selected. The marker layers are preferably selected in the strata after the Hercynian tectonic movement. The thickness of the Permian strata between the multiple marker layers is corrected by the de-compaction value. The top marker layer is preferably about 200 meters away from the target layer. The thick sandstone of the Qian5 section at the bottom of Shiqianfeng is generally selected for the Upper Paleozoic. The ideal distance between the bottom marker layer and the target layer is 30 to 40 meters. Generally, the coarse sandstone at the bottom of Box 7 or the mudstone at the top of Box 8 is selected to clarify the stratigraphic thickness and vertical depth of different layers.

[0032] 2) According to the principle that the overlying marker layer has the same lithological and electrical characteristics, the thickness difference of the contemporary strata is less than 10m, and the structural trend is consistent with the vertical depth of the surrounding well points, the important nodes for well inclination adjustment in the target entry stage are set; in the implementation of the inclined well section, four vertical positioning methods are applied, namely, formation thickness comparison, marker layer lithology identification, while drilling logging description, and while drilling logging analysis. According to the results of marker layer comparison, according to the predicted vertical depth of the target layer target point and the well trajectory, seven stage control nodes of well inclination of 10°, 30°, 45°, 60°, 70°, 80°, and 83° are set from top to bottom, and the predicted vertical depth of the target point is continuously corrected, and the reasonable well inclination angle is adjusted in time to ensure that the target entry point is located at the development position of the gas-bearing sand body in the target layer. At the same time, the well inclination is adjusted to 89.5° to 90° to achieve accurate target entry.

[0033] 3) Using the drilling, logging, mud recording and core description data of the control skeleton wells around the horizontal well, the profile comparison analysis and plane detailed characterization are carried out. The plane profile is consistent, and the sedimentary microfacies type and distribution characteristics of the horizontal well design target layer, as well as the sandstone and mudstone phase combination characteristics encountered in the horizontal section are described. A sedimentary model is established to identify the sand body sedimentary phase, interlayer type, thickness and extension scale.

[0034] Among them, the sedimentary model is established by utilizing the relationship between stratigraphic sedimentary structures and sedimentary facies. On the basis of regional sedimentary environment analysis, the "phase sequence transition law" is used to establish a local regional sedimentary model. At the same time, the sedimentary model is continuously revised using the drilling data of horizontal wells. The sandstone encountered in drilling corresponds to the river channel or heart bar sedimentary microfacies, the mudstone corresponds to the inter-channel or floodplain sedimentary microfacies, and the thin layer of mudstone less than 2 meters developed inside the sandstone is defined as an interlayer. Based on the above understanding, a graphical model is established to ensure that the lithology and sedimentary microfacies are 100% consistent.

[0035] The identification of interlayer type is based on the color of the mudstone encountered, gamma while drilling, drilling time, thickness to determine whether it is an interlayer or internal interlayer. When an interlayer is encountered, it is generally a lateral phase change mudstone or a thick mudstone (greater than 2m) between sand bodies of different periods and sub-strata in the vertical direction. The gamma while drilling curve will undergo a sudden change, showing a box shape, with a high value (generally greater than 180API), relatively poor drillability (20min / m to 40min / m when drilling), and gray to dark gray in color. At this time, a larger well inclination adjustment is adopted to track the substitute gas layer; when a mudstone interlayer is encountered, the gamma while drilling curve is generally gradual and spike-shaped, with a low value (generally less than 150API), a thickness of less than 2m, an unstable distribution, relatively good drillability (5min / m to 10min / m when drilling), and light gray to gray in color. At this time, fine-tuning or no adjustment is adopted to quickly drill through the mudstone interlayer.

[0036] 4) Targeted processing and interpretation work is carried out using 3D seismic data. Micro-logging constrained tomographic static correction technology is used to provide a data basis for the fine characterization of small-amplitude structural gas reservoirs. Near-surface Q compensation technology is used to further improve and improve data consistency and resolution. OVT domain anisotropic pre-stack migration technology is used to further improve seismic imaging accuracy. Focusing on micro-amplitude structural characterization and thin reservoir prediction, the imaging accuracy and resolution of the target layer are fully improved. The well logging curves of the completed wells are used to constrain seismic horizons, establish wave impedance models, and carry out forward analysis. The seismic data resolution of the target layer is improved by using model forward modeling results, acoustic wave synthesis records and VSP results constraints. Fully consider the formation, lithology, and structural development characteristics of the region, establish a high-precision velocity model, and combine the latest geological knowledge to carry out multiple rounds of velocity correction to obtain a relatively accurate velocity model. Target pre-stack depth migration is carried out to accurately return the seismic reflection wave to improve the accuracy of small-amplitude structural imaging. High-precision pre-stack inversion is then used to predict the spatial morphology, structural undulation, development scale, physical properties, gas content and other reservoir development characteristics of the target layer.

[0037] Specifically, high-precision prestack inversion is as follows: during the implementation of horizontal well drilling, the geological stratification, logging and mud logging data of newly completed wells in the three-dimensional seismic area are continuously added. Under the constraints of drilling geological stratification data and logging interpretation layers, a higher-precision velocity field is established to achieve accurate conversion of three-dimensional seismic time domain to depth domain, ensuring that the overall conformity rate of stratification and logging interpretation results of completed wells reaches more than 90%, and 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 model is used to predict the spatial distribution characteristics of sandstone in the target layer, and the porosity, permeability and gas saturation of the completed well logging interpretation are combined to further establish a porosity, permeability and gas saturation probability data model.

[0038] 5) Based on the spatial morphology, structural undulation, development scale, physical properties, and gas content of the target layer predicted by 3D seismic, reservoir configuration analysis is carried out, quantitative sand body characterization is performed under the constraints of horizontal well data, a reservoir geological knowledge base for the target layer is established, and a more detailed 3D geological model is constructed based on the reservoir geological knowledge base.

[0039] Specifically, the quantitative sand body characterization under the constraints of horizontal well data is as follows: in view of the limitations of inter-well prediction of traditional fluvial facies sand body quantitative characterization methods, a large amount of horizontal well data is used to carry out research on the structural undulation of the target layer, the internal structure of the reservoir sand body, and the identification of sand bodies of different orders. The sandstone and mudstone fabric characteristics of the horizontal wells on the profile are described, and a hierarchical description of "composite channel sand body (5-level architectural unit)-single channel sand body (4-level architectural unit)-internal accretionary body (3-level architectural unit)" is carried out. The description scale ranges from 15m thick composite sand body to 5m thick thin sand body, and the distribution morphology of channel sand body and its development scale are accurately predicted.

[0040] The establishment of reservoir geological knowledge base is as follows: based on the quantitative characterization results of tight sandstone gas reservoirs in different blocks, geostatistical analysis is carried out to determine the thickness, width, length, inclination, and drilling rate parameters of different reservoir configuration units.

[0041] The specific steps of constructing a fine three-dimensional geological model are as follows: using the reservoir geological knowledge base as a constraint, making full use of the hard data of sedimentary phases and sand body thickness for deterministic modeling, and combining the inverted sandstone probability body model to organically combine deterministic modeling with stochastic modeling to reduce the multi-solution nature of the prediction; comprehensively establishing a three-dimensional geological data model by integrating the sedimentary phase model and lithofacies model, and comprehensively utilizing the three-dimensional seismic sandstone and gas-bearing probability body data model for constraints, so as to achieve a consistency of more than 90% between geological research understanding, earthquake prediction results, and well point drilling data, and finally establishing a high-precision three-dimensional geological data model based on the constraints of seismic, geological, logging, and mud logging data.

[0042] 6) During the implementation of the horizontal section, sedimentary model guidance, 3D seismic guidance, and 3D modeling guidance were carried out respectively. The sedimentary model was mainly used to describe the sedimentary phase of the sand body, the type of interlayer, thickness and extension scale for guidance. The 3D seismic model was mainly used to predict the structural undulation and the spatial development position of the sand body for guidance. The 3D geological model was mainly used to describe the lithological boundary and physical boundary for fine control. The advantage of the sedimentary geological model is that it can be closely combined with the fine comparison results of the actual drilling small layers, and the tracking model can be corrected in real time according to the drilling data. It can achieve accurate targeting of horizontal wells, clarify the sedimentary phase type encountered in the horizontal section, and determine whether the lithology of the horizontal section has undergone phase change; three-dimensional seismic data is the continuous reflection sound wave data of the real underground geological body, which is a true reflection of the underground stratum information. It can distinguish the boundaries of composite river channels and judge the relative spatial position of the dominant sand body. The three-dimensional seismic probability body model can provide macro-directional control, and has good prediction and guidance for the horizontal section guidance, which can effectively avoid side drilling; three-dimensional geological modeling is a comprehensive display of seismic geological results data, which can finely depict the structural and sandstone distribution characteristics in three-dimensional space, comprehensively predict the lithology boundary points and physical boundary points of the reservoir to be drilled in the horizontal section, and guide the optimal and fast drilling of the horizontal section. It is also the key to obtaining good reservoir drilling effects. During the horizontal well targeting process, the focus is on strengthening the fine division and comparison of geological layers, and the three-dimensional seismic is mainly used to determine the target point and target space. During the horizontal section drilling, the three-dimensional seismic is used to macroscopically predict the location of favorable reservoir sand bodies, and the geological fine description and analysis of the lithology and gas content changes in the horizontal section are carried out. Real-time analysis and adjustment during the drilling process should meet the following quantitative indicators:

[0043] (1) The first-time target penetration success rate of horizontal wells is 100% (the vertical depth of the target is within ±5m of the design error);

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

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

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

[0047] (5) There is no sidetracking in horizontal wells due to steering decision errors;

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

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

[0050] Example 1

[0051] like Figure 2 As shown in the figure, in the process of horizontal well steering, the skeleton well was used to finely compare and divide the sand body, describe the internal structure and lithology changes of the sand body, and make a small adjustment to the horizontal section inclination to achieve the drilling of the horizontal section inside the target layer sand body. The horizontal section gas logging was reduced in time by 0.5 degrees to reduce the inclination; the three-dimensional seismic model was used to describe the structure and the development position of the dominant sand body, and the horizontal section trajectory was adjusted downward twice to effectively avoid invalid footage and well filling and sidetracking; the three-dimensional geological model was used to describe the lithology boundary, physical boundary and sweet spot development area, and the horizontal section trajectory design and inclination setting were timely optimized to achieve the horizontal section. The horizontal section length of the well was 5256m, the sandstone drilling rate was 97.6%, the gas layer drilling rate was 71.0%, and the open flow rate was 2.205 million cubic meters / day.

[0052] Example 2

[0053] like Figure 3 As shown in the figure, in the process of horizontal well guidance, the skeleton well was used to finely compare and divide the sand body, describe the internal structure and lithology changes of the sand body, depict the distribution of interlayers, avoid the horizontal section from encountering interlayers, and realize the horizontal section drilling in the target layer; the three-dimensional seismic model describes that the structural changes are not large, and the altitude of the dominant sand body development position along the horizontal section direction becomes higher. The horizontal section trajectory chooses a well inclination of 90.5-91 degrees to drill, effectively avoiding penetrating the target layer sand body; the three-dimensional geological model is used to describe the lithology boundary, physical boundary and sweet spot development area, and the horizontal section trajectory design and well inclination setting are timely optimized to ensure the smooth drilling of the horizontal section inside the sweet spot area. If the physical property deteriorates, the well inclination is adjusted to 91 degrees. The horizontal section of the well is 3321m long, the reservoir drilling rate is 100%, the gas layer drilling rate is 93.3%, and the open flow rate is 3.207 million cubic meters / day.

[0054] Example 3

[0055] like Figure 4 As shown in the figure, in the process of horizontal well steering, the skeleton well was used to finely compare and divide the sand body, and a sedimentary model was established to describe the lateral changes of the sand body. The sand body thickness of the starting well was relatively thin. After entering the target, the well inclination was adjusted to 90 degrees for smooth drilling, so that the horizontal section was drilled in the target layer sand body; the three-dimensional seismic model described the structure to be gentle, and the target layer sand body in the horizontal section of the rock obviously thickened downward. The horizontal section trajectory was selected to be drilled at a well inclination of about 89 degrees, so that the horizontal section was located in the middle of the target layer sand body; the three-dimensional geological model was used to describe the lithology boundary, physical boundary and sweet spot development area, and the horizontal section trajectory design and well inclination angle were refined in sections to ensure smooth drilling of the horizontal section inside the sweet spot area. If the physical property deteriorated, the well inclination was adjusted to 89 degrees for implementation. The horizontal section of the well is 4118m long, with a reservoir drilling rate of 99.3%, a gas layer drilling rate of 79.7%, and an open flow rate of 2.622 million cubic meters per day.

[0056] Example 4

[0057] like Figure 5 As shown in the figure, in the process of horizontal well steering, the skeleton well is used to finely compare and divide the sand body, and a sedimentary model is established to describe the lateral changes of sand bodies in different periods. The top of the target layer does not contain gas, and the middle and lower parts of the target layer sand body are selected for targeting, so that the horizontal section can be drilled in the gas-bearing sand body of the target layer; the three-dimensional seismic model describes the flat structure and good continuity of the sand body. The horizontal section trajectory selects a well inclination of about 90 degrees to achieve fast drilling of the horizontal section; the three-dimensional geological model is used to describe the physical boundary and the sweet spot development area, and the well inclination angle is fine-tuned in time to ensure the smooth drilling of the horizontal section inside the sweet spot area. The horizontal section of the well is 3500m long, with a sandstone drilling rate of 97.3%, an effective reservoir drilling rate of 88.2%, and an open flow rate of 2.837 million cubic meters per day.

Claims

1. A horizontal well steering method based on multidisciplinary interactive verification, characterized in that: The following steps are involved: Step 1: Select multiple regional marker layers, perform graded and fine stratigraphic comparison to obtain stratigraphic comparison maps, and obtain the actual drilled layers and their thickness and vertical depth; Step 2: Use different well inclination angles as control nodes, apply vertical positioning methods to control step by step with vertical positioning results, continuously correct the predicted target vertical depth, and adjust the well inclination angle for precise target entry; Step 3: Establish a sedimentary model for horizontal section guidance, and use the sedimentary model to describe the type, thickness and extension distance of the internal interlayers of the target layer; Step 4: Establish a three-dimensional seismic model, use pre-stack depth migration processing to accurately return the seismic reflection waves, and use pre-stack inversion results to predict the reservoir development characteristics of the target layer; Step 5: Perform quantitative sand body characterization to obtain the width-to-thickness ratio, thickness, length and inclination of the sand body, establish a reservoir geological knowledge base, and guide the construction of a three-dimensional geological model; Step 6: Use sedimentary models, three-dimensional seismic models and three-dimensional geological models to guide horizontal well drilling.

2. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The marker layer selected in step 1 is selected in the stratum after the Hercynian tectonic movement occurred. The thickness of the Permian strata between multiple marker layers adopts a de-compaction correction value. The top marker layer is 200 meters away from the target layer, and the bottom marker layer is 30 to 40 meters away from the target layer.

3. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The control nodes in step 2 include well inclination angles of 10°, 30°, 45°, 60°, 70°, 80°, and 83°; precise targeting ensures that the target point is located inside the gas-bearing sand body of the target layer, and the well inclination angle is adjusted to 89.5° to 90°.

4. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The vertical positioning method in step 2 includes formation thickness comparison, marker layer lithology identification, while-drilling logging description and while-drilling logging analysis.

5. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The sedimentation model established in step 3 is based on the relationship between the basin stratigraphic sedimentary structure and the sedimentary lithofacies. On the basis of regional geological sedimentary environment analysis, the local regional sedimentation model is established using the phase sequence transition law, and the sedimentation model is continuously corrected using the horizontal well drilling measurement data and logging data.

6. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The description of the internal interlayer type of the target layer in step 3 is based on the color, gamma, thickness and drilling time of the mudstone encountered to determine whether the interlayer or internal interlayer is encountered. When the interlayer is encountered, the gamma curve while drilling suddenly changes to a box shape, with a value greater than 180API, a drilling time of 20min / m to 40min / m, and a gray to dark gray color. At this time, a larger well inclination adjustment is adopted to track the substitute gas layer; when the mudstone interlayer is encountered, the gamma curve while drilling is gradual and spike-shaped, with a value less than 150API, a drilling time of 5min / m to 10min / m, and a light gray to gray color. At this time, fine-tuning or no adjustment is adopted to quickly drill through the mudstone interlayer.

7. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The pre-stack inversion in step 4 is specifically as follows: during the drilling process, new drilling data is continuously added, and under the control of the drilling geological stratification data and the interpretation layer, a velocity field is established to realize the conversion of the three-dimensional seismic time domain to the depth domain, and then a depth domain seismic model of the main target layer is established.

8. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The reservoir development characteristics obtained in step 4 include spatial morphology, structural undulations, development scale, physical properties and gas content.

9. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: The quantitative sand body characterization in step 5 is specifically as follows: analyzing the sand-shale fabric characteristics of horizontal wells, performing a hierarchical description of composite channel sand bodies, single channel sand bodies, and internal accretion bodies, with the description scale ranging from 15m thick composite sand bodies to 5m thick thin sand bodies, and predicting the distribution morphology of channel sand bodies and their development scale.

10. The horizontal well steering method based on multidisciplinary interactive verification according to claim 1, characterized in that: In the step 6, the sedimentary model obtained in step 3 is used to describe the sedimentary phase, interlayer type, thickness and extension scale of the sand body for guidance, the three-dimensional seismic model obtained in step 4 is used to predict the structural undulation and the spatial development position of the sand body for guidance, and the three-dimensional geological model obtained in step 5 is used to describe the lithological boundary and physical boundary for guidance, so that the horizontal well drilling meets the following quantitative indicators: 1) the horizontal well has a 100% one-time target success rate, and the vertical depth of the target is within ±5m of the design error; 2) the length of the horizontal section meets the designed geological purpose; 3) the sandstone encounter rate of the horizontal section is greater than 80%; 4) the gas layer encounter rate of the horizontal section is greater than 60%; 5) There is no sidetracking in the horizontal wells due to steering decision errors; 6) The wellbore trajectory parameters of the horizontal section meet the engineering design requirements.

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