Manufacturing and using method of second-class oil layer polymer flooding block development parameter optimization chart

Abstract

The invention discloses a method for manufacturing a second-class oil reservoir polymer flooding block development parameter optimization chart, and relates to the technical field of tertiary oil recovery of sandstone oilfield development. The problems that the development effect is greatly influenced by factors such as the second-type oil layer river channel sand river channel width, the well pattern and well spacing and the sand body communication proportion, and the development adjustment and optimization difficulty is large are solved. Comprising the following steps: S1, statistically analyzing an actual polymer-flooding second-class block river channel width coverage range, and establishing a geologic theoretical model of different river channel widths; s2, deploying polymer flooding injection and production well patterns with different well spacing according to the actual second-class polymer flooding development well pattern type of the oil field; s3, counting and calculating the sand body communication proportion of different geologic models and development well pattern combinations; and S4, drawing a statistical chart taking the river channel width as a horizontal coordinate, the sand body communication proportion as a vertical coordinate and the coordinate values corresponding to the same well spacing as a connecting line. The plate manufactured by the method can quickly provide a guidance basis for second-class oil reservoir polymer flooding development scheme compilation, injection-production system adjustment and measure adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of tertiary oil recovery in sandstone oilfields, and in particular to a method for making and using a method chart for optimizing development parameters of a second-class oil layer polymer flooding block. Background Art

[0002] Class II reservoirs primarily refer to sandstone reservoirs between primary and secondary reservoirs. These reservoirs are numerous and possess significant reserves, but their permeability is lower than that of primary reservoirs, their thickness is thinner, their channel sands are narrower, and their continuity is poorer. These reservoirs represent the current reservoirs providing continued production capacity in mature continental oilfields in China. Polymer flooding development and polymer flooding well patterns refer to polymer flooding development and polymer flooding well patterns.

[0003] Currently, polymer flooding has been industrialized and applied in some oil fields. Class I reservoirs have all transitioned to subsequent water flooding, and the primary target for polymer flooding is Class II reservoirs. Compared to Class I reservoirs, Class II reservoirs have smaller channel sands and greater lateral and vertical heterogeneity. Factors such as channel width, well pattern spacing, and sandbody connectivity significantly influence development outcomes, making development adjustments and optimization more challenging. Summary of the Invention

[0004] The present invention addresses the problem in the prior art that factors such as the width of the channel sand channel, well pattern spacing, and sandbody connectivity ratio significantly impact development results and make development adjustment and optimization difficult. The present invention provides a method for producing a development parameter optimization chart for polymer flooding blocks in Class II oil layers. The chart can quickly provide guidance for formulating polymer flooding development plans, adjusting injection and production systems, and adjusting measures for Class II oil layers, thereby improving the polymer flooding recovery rate of Class II oil layers. The present invention also provides a method for using the development parameter optimization chart for polymer flooding blocks in Class II oil layers.

[0005] The present invention solves the problem by the following technical solution: The method for preparing the optimization chart for development parameters of the second type oil layer polymer flooding block comprises the following steps:

[0006] S1. Based on the actual coverage of the width of the river channel sand body in the second type of polymer flooding blocks in the oil field, a geological theoretical model of different river channel sand body widths is established;

[0007] S2. Deploy polymer flooding injection-production well patterns with different polymer flooding injection-production well spacings based on the actual well pattern type and polymer flooding injection-production well spacings in the Class II polymer flooding blocks of the oilfield;

[0008] S3. Statistical calculation of the sand body connectivity ratio of the geological theoretical model and the development of the polymer flooding injection and production well pattern combination;

[0009] S4. Based on the three parameters of the river channel width, polymer flooding injection and production well spacing, and the corresponding sand body connectivity ratio of the above different models, a statistical chart is drawn with the river channel width as the horizontal axis, the sand body connectivity ratio as the vertical axis, and the corresponding coordinate values ​​of the same well spacing as connecting lines.

[0010] Preferably, the method for preparing the geological theoretical model of different river channel sand body widths in step 1 comprises the following steps:

[0011] Use modeling software to create bedding planes and sedimentary facies models;

[0012] Select the representative values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field;

[0013] Use the facies modification tool to modify the width of the channel facies in the sedimentary facies model so that the width of the channel sand in the sedimentary facies model meets the established requirements; that is, the width of the channel sand in the sedimentary facies model is a representative value within the coverage range of the width of the channel sand body in the actual Class II polymer flooding block of the selected oil field;

[0014] Select the remaining values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field, repeat the above steps, and generate theoretical models with different channel widths;

[0015] and / or,

[0016] The modeling software is petrel software or GPTModel reservoir geological modeling software.

[0017] Preferably, the step S3 of statistically calculating the sand body connectivity ratio of the second type oil layer in the target block for polymer flooding development includes:

[0018] The connectivity ratios of the two types of sand bodies, river channel-river channel and river channel-river channel, at the well points in the target block are calculated; the sum of the two connectivity ratios of sand bodies at the same well point should be 100%.

[0019] According to the method for preparing a development parameter optimization chart for a Class II oil layer polymer flooding block, a method chart for optimizing development parameters for a Class II oil layer polymer flooding block is prepared; the use scope of the chart covers polymer flooding development conditions with a river channel sand body width of 100m-700m and a polymer flooding well pattern spacing of 100m-200m.

[0020] The present invention also provides a method for using a parameter optimization chart for polymer flooding block development in a second type of oil layer. After the chart is formed, the reasonable range of the third parameter is determined based on two existing parameters of the three parameters of the actual block.

[0021] Preferably, the injection-production well spacing is optimized using the prepared chart.

[0022] Preferably, the method for optimizing the injection-production well spacing using the prepared chart is as follows: optimizing the injection-production well spacing using the chart, after determining the channel scale of the block development reservoir and the expected channel (inter-channel) sand body connectivity ratio, reading the corresponding injection-production well spacing range from the chart;

[0023] Optimize and adjust the block well network spacing based on the read injection and production well spacing range.

[0024] Preferably, the prepared map is used to optimize the development layer.

[0025] Preferably, the method for optimizing the development horizon using the prepared plate is:

[0026] After determining the well pattern spacing of the block and the expected channel (inter-channel) sand body connectivity ratio, the corresponding channel width is read from the chart;

[0027] The development layer is selected based on the river width at different layers in the block.

[0028] Preferably, the prepared plate is used to determine the connectivity ratio of the sand bodies.

[0029] Preferably, the method for determining the connectivity ratio of sand bodies using the prepared plate is:

[0030] After determining the well pattern and spacing of the block and the scale of the river channel in the development layer, the corresponding river channel (inter-river) sand body connectivity ratio can be read from the chart;

[0031] The read sand body connectivity ratio provides a reference for the next adjustment.

[0032] Compared with the above background technology, the present invention has the following beneficial effects:

[0033] This chart can quickly and accurately calculate parameters such as the optimal injection-production well spacing, optimal injection-polymer sandbody size, and sandbody connectivity ratio for Class II reservoir polymer flooding development. It can effectively guide the development of well pattern adjustment plans, injection-polymer flooding plans, and comprehensive adjustment plans for Class II blocks. The implementation of these plans can effectively improve the recovery rate of the blocks.

[0034] This invention relates to a method for optimizing development parameters in polymer flooding blocks for Class II reservoirs. The method describes a correlation between well spacing, channel width, and channel (inter-channel) sandbody connectivity in these blocks. By integrating these three parameters into a parameter optimization method, it can quickly provide guidance for developing polymer flooding plans, adjusting injection and production systems, and adjusting measures for Class II reservoirs, thereby improving polymer flooding recovery rates for Class II reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the second type of oil layer polymer flooding block development parameter optimization chart produced and used in Example 1 of the present invention;

[0036] Figure 2 This is the second type of oil layer polymer flooding block development parameter optimization chart produced and used in Example 2 of the present invention;

[0037] Figure 3 This is the second type of oil layer polymer flooding block development parameter optimization chart produced and used in Example 3 of the present invention;

[0038] Figure 4 It is a flow chart for preparing the development parameter optimization chart for the second type of oil layer polymer flooding block according to the present invention. DETAILED DESCRIPTION

[0039] To further clarify the objectives, technical solutions, and advantages of the present invention, the following provides a clear and complete description of the technical solutions of the present invention in conjunction with the following embodiments. However, the described embodiments are only partial embodiments of the present invention, not all embodiments. All other embodiments obtained based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] like Figure 4 As shown, a method for preparing a development parameter optimization chart for a Class II oil layer polymer flooding block includes the following steps:

[0041] S1. Based on the actual coverage of the width of the river channel sand body in the second type of polymer flooding blocks in the oil field, a geological theoretical model of different river channel sand body widths is established;

[0042] The method for preparing the geological theoretical model of different river channel sand body widths comprises the following steps:

[0043] Use modeling software to create bedding planes and sedimentary facies models;

[0044] Select the representative values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field;

[0045] Use the facies modification tool to modify the width of the channel facies in the sedimentary facies model so that the width of the channel sand in the sedimentary facies model meets the established requirements; that is, the width of the channel sand in the sedimentary facies model is a representative value within the coverage range of the width of the channel sand body in the actual Class II polymer flooding block of the selected oil field;

[0046] Select the remaining values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field, repeat the above steps, and generate theoretical models with different channel widths;

[0047] The modeling software is petrel software or GPTModel reservoir geological modeling software.

[0048] S2. Deploy polymer flooding injection-production well patterns with different polymer flooding injection-production well spacings based on the actual well pattern type and polymer flooding injection-production well spacings in the Class II polymer flooding blocks of the oilfield;

[0049] S3. Statistical calculation of the sand body connectivity ratio of the geological theoretical model and the development of the polymer flooding injection and production well pattern combination;

[0050] The connectivity ratios of the two types of sand bodies, river channel-river channel and river channel-river channel, at the well points in the target block are calculated; the sum of the two connectivity ratios of sand bodies at the same well point should be 100%.

[0051] S4. Based on the three parameters of the river channel width, polymer flooding injection and production well spacing, and the corresponding sand body connectivity ratio of the above different models, a statistical chart is drawn with the river channel width as the horizontal axis, the sand body connectivity ratio as the vertical axis, and the corresponding coordinate values ​​of the same well spacing as connecting lines.

[0052] According to the method for preparing a development parameter optimization chart for a Class II oil layer polymer flooding block, a method chart for optimizing development parameters for a Class II oil layer polymer flooding block is prepared; the use scope of the chart covers polymer flooding development conditions with a river channel sand body width of 100m-700m and a polymer flooding well pattern spacing of 100m-200m.

[0053] A method for using the development parameter optimization chart for a Class II oil layer polymer flooding block:

[0054] After the chart is formed, the reasonable range of the third parameter is determined based on two of the three parameters of the actual block. The specific steps include:

[0055] 1. Use the chart to optimize the injection and production well spacing

[0056] Optimizing Injection-Production Spacing Using a Chart: Once the channel size and expected channel (inter-channel) sandbody connectivity ratio for the reservoir development block are determined, the corresponding injection-production well spacing range is read from the chart. Based on this read-in injection-production well spacing range, the block's well pattern is optimized and adjusted.

[0057] 2. Use the map to select the optimal development layer

[0058] After determining the well pattern and spacing for the block and the expected connectivity ratio of the channel (or inter-channel) sand bodies, the corresponding channel width is read from the chart. Optimization of development horizons is then carried out based on the channel widths at different levels in the block.

[0059] 3. Use the chart to determine the connectivity ratio of the sand body

[0060] Once the well pattern and spacing for the block and the size of the river channel in the development horizon are determined, the corresponding river channel (inter-river) sandbody connectivity ratio can be read from the chart. This read sandbody connectivity ratio provides a reference for subsequent adjustments.

[0061] Example 1

[0062] This embodiment uses a chart to optimize the injection-production well spacing.

[0063] like Figure 1 As shown, the conditions for using the plate are: in this embodiment, the river channel width of the target block is 180m-200m, and the scheme expects the river channel sand body connectivity ratio to be 35%-45%. Currently, it is necessary to design the injection and production well spacing of this type II oil layer polymer flooding block.

[0064] Plate preparation method:

[0065] The method for optimizing the development parameters of the second type of oil layer polymer flooding block includes the following steps:

[0066] S1. Based on the actual coverage of the river channel sand bodies in the second-class polymer flooding blocks of the oil field, theoretical geological models of seven types of river channels with widths of 100m-700m were established.

[0067] S2. Based on the well pattern type and well spacing of the actual Class II polymer flooding development in the oil field, three types of five-point injection-production well patterns with lengths of 125m, 150m, and 175m were deployed on the basis of the theoretical geological model of seven types of river channels.

[0068] S3. Statistically analyze the internal and external connectivity ratios of the 21 theoretical models consisting of the above 7 types of river channels and 3 types of well networks, and obtain 21 river-to-river connectivity ratio values ​​and 21 river-to-river connectivity ratio values.

[0069] S4. Based on the three parameters of river channel width, sand body connectivity ratio, and polymer flooding injection-production well spacing obtained above, a statistical chart is drawn with river channel width as the horizontal coordinate, sand body connectivity ratio as the vertical coordinate, and corresponding coordinate values ​​of the same well spacing as connecting lines.

[0070] See the plate produced Figure 1 The solid lines in the figure represent channel-to-channel sandbody connectivity, and the dashed lines represent channel-to-interchannel sandbody connectivity. In the legend, HH indicates channel-to-channel sandbody connectivity, HJ indicates channel-to-interchannel sandbody connectivity, and 125, 150, and 175 represent typical injection-production well spacings in polymer flooding well patterns. Channel widths in Class II reservoirs are generally less than 600 m, and well spacing significantly influences the proportion of sandbody connectivity within the channel. 70% of channel widths are between 180 and 400 m, and a 150 m well spacing ensures a 30-48% connectivity ratio for sandbody connectivity within the channel.

[0071] like Figure 1 As shown, the use of the plate includes:

[0072] (1) From the horizontal axis of the plate, take the range of 180m-200m and the vertical axis take the range of 35%-45% to form a rectangle.

[0073] (2) The injection and production well range read from the rectangular coverage is between the 125m well spacing line and the 150m well spacing line. The injection and production well spacing line corresponding to the center of the rectangle is interpolated to 140m through the 125m well spacing line and the 150m well spacing line.

[0074] (3) Therefore, in order to achieve the target channel-channel sand body connectivity ratio when implementing polymer flooding in this type II oil layer area, the reasonable injection-production well spacing range is 125m-150m, among which the optimal injection-production well spacing is 140m.

[0075] Through this embodiment, the optimal injection-production well spacing of the target block is calculated, which effectively guides the optimization of the injection-production well spacing in the well pattern adjustment plan of the second type of block. Through the implementation of the above well pattern adjustment plan, the recovery rate of the second type of block is effectively improved.

[0076] Example 2

[0077] This embodiment uses the map to optimize the development layer.

[0078] like Figure 2 As shown, the conditions for using the plate are: in this embodiment, the injection-production well spacing expected in the plan for the target block is 150m-180m, and the connectivity ratio of the river channel sand body expected in the plan is 40%-50%. Currently, it is necessary to optimize the development layer for this block.

[0079] Plate preparation method:

[0080] The method for optimizing the development parameters of the second type of oil layer polymer flooding block includes the following steps:

[0081] S1. Based on the actual coverage of the river channel sand bodies in the second-class polymer flooding blocks of the oil field, theoretical geological models of seven types of river channels with widths of 100m-700m were established.

[0082] S2. Based on the well pattern type and well spacing of the actual Class II polymer flooding development in the oil field, three types of five-point injection-production well patterns with lengths of 125m, 150m, and 175m were deployed on the basis of the theoretical geological model of seven types of river channels.

[0083] S3. Statistically analyze the internal and external connectivity ratios of the 21 theoretical models consisting of the above 7 types of river channels and 3 types of well networks, and obtain 21 river-to-river connectivity ratio values ​​and 21 river-to-river connectivity ratio values.

[0084] S4. Based on the three parameters of river channel width, sand body connectivity ratio, and polymer flooding injection and production well spacing obtained above, a statistical chart is drawn with river channel width as the horizontal coordinate, sand body connectivity ratio as the vertical coordinate, and the corresponding coordinate values ​​of the same well spacing as connecting lines. See the chart for the prepared chart. Figure 2 .

[0085] like Figure 2 As shown, the use of the plate includes:

[0086] (1) Take the range of 40%-50% from the vertical coordinate in the plate and the well spacing line as 150m-180m to form a rectangle.

[0087] (2) The width of the river channel read from the rectangular coverage range is between 280m and 300m. The width of the river channel corresponding to the center of the rectangle is read as 290m according to the horizontal coordinate.

[0088] (3) Therefore, in order to simultaneously meet the requirements of well spacing and channel-to-channel sandbody connectivity ratio, the reasonable width of the channel sand should be in the range of 280m-300m, with the optimal channel width being 290m.

[0089] (4) Based on the width range of the sand channel, select the second type of polymer flooding layer in the target area.

[0090] Through this embodiment, the optimal channel size of the target block injection layer is calculated, which effectively guides the optimization of the layer in the injection scheme of the second type of block. Through the implementation of the above injection scheme, the recovery rate of the second type of block is effectively improved.

[0091] Example 3

[0092] This embodiment uses a chart to determine the connectivity ratio of the sand bodies.

[0093] like Figure 3 As shown, the conditions for using the chart are: in this embodiment, the river channel width of the target block is 200m-220m, and the injection-production well spacing is 150m-175m. Currently, it is necessary to determine the sand body connectivity ratio of this block in order to optimize the measures at the bottom.

[0094] Plate preparation method:

[0095] The method for optimizing the development parameters of the second type of oil layer polymer flooding block includes the following steps:

[0096] S1. Based on the actual coverage of the river channel sand bodies in the second-class polymer flooding blocks of the oil field, theoretical geological models of seven types of river channels with widths of 100m-700m were established.

[0097] S2. Based on the actual well pattern type and well spacing of the second-class polymer flooding development in the oil field, three types of five-point injection-production well patterns with lengths of 125m, 150m, and 175m were deployed on the basis of the theoretical geological model of seven types of river channels.

[0098] S3. Statistically analyze the internal and external connectivity ratios of the 21 theoretical models consisting of the above 7 types of river channels and 3 types of well networks, and obtain 21 river-to-river connectivity ratio values ​​and 21 river-to-river connectivity ratio values.

[0099] S4. Based on the three parameters of river channel width, sand body connectivity ratio, and polymer flooding injection and production well spacing obtained above, a statistical chart is drawn with river channel width as the horizontal coordinate, sand body connectivity ratio as the vertical coordinate, and the corresponding coordinate values ​​of the same well spacing as connecting lines. See the chart for the prepared chart. Figure 3 .

[0100] like Figure 3 As shown, the use of the plate includes:

[0101] (1) Take the range of 200m-220m from the horizontal coordinate in the plate and the well spacing line value of 150m-175m to form a rectangle.

[0102] (2) The channel-to-channel sandbody connectivity ratio read from the rectangular coverage ranges between 36% and 46%. The sandbody connectivity ratio corresponding to the center of the rectangle is 41% as read from the vertical coordinate.

[0103] (3) Therefore, under the conditions of channel sand body width of 200m-220m and well spacing of 150m-175m, the channel-channel sand body connectivity ratio ranges from 36% to 46%, with a median of 41%.

[0104] (4) Based on the channel-channel sand body connectivity ratio read from the map, the next step adjustment is optimized in the target area.

[0105] Through this example, the sand body connectivity ratio interval of the target block was calculated, providing a basis and guidance for the preparation of a comprehensive adjustment plan for the Class II blocks in the area. Through the implementation of the above comprehensive adjustment plan, the recovery rate of the Class II blocks was effectively improved.

[0106] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the implementation methods of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the present invention.

Claims

1. A method for preparing a development parameter optimization chart for a Class II oil layer polymer flooding block, characterized by: The following steps are involved: S1. Based on the actual coverage of the width of the river channel sand body in the second type of polymer flooding blocks in the oil field, a geological theoretical model of different river channel sand body widths is established; S2. Based on the well pattern type and injection-production well spacing of the actual Class II polymer flooding blocks in the oilfield, deploy polymer flooding injection-production well patterns with different injection-production well spacings based on the above geological theoretical model; S3. Statistical calculation of the sand body connectivity ratio of the geological theoretical model and the development of the polymer flooding injection and production well pattern combination; S4. Based on the three parameters of the river channel width, polymer flooding injection and production well spacing, and the corresponding sand body connectivity ratio of the above different models, a statistical chart is drawn with the river channel width as the horizontal axis, the sand body connectivity ratio as the vertical axis, and the corresponding coordinate values ​​of the same well spacing as connecting lines.

2. The method for preparing a plate for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 1, characterized in that: The method for preparing the geological theoretical model of different river channel sand body widths in step 1 comprises the following steps: Use modeling software to create bedding planes and sedimentary facies models; Select the representative values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field; Use the facies modification tool to modify the width of the channel facies in the sedimentary facies model so that the width of the channel sand in the sedimentary facies model meets the established requirements; that is, the width of the channel sand in the sedimentary facies model is a representative value within the coverage range of the width of the channel sand body in the actual Class II polymer flooding block of the selected oil field; Select the remaining values ​​within the coverage range of the width of the channel sand body in the actual second-class polymer flooding block of the oil field, repeat the above steps, and generate theoretical models with different channel widths; and / or, The modeling software is petrel software or GPTModel reservoir geological modeling software.

3. The method for preparing a plate for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 1, characterized in that: The step S3 statistically calculates the sand body connectivity ratio of the second type oil layer in the target block for polymer flooding development, specifically including: The connectivity ratios of the two types of sand bodies, river channel-river channel and river channel-river channel, at the well points in the target block are calculated; the sum of the two connectivity ratios of sand bodies at the same well point should be 100%.

4. The method for preparing a plate for optimizing development parameters of a polymer flooding block in a Class II oil layer according to any one of claims 1 to 3, comprising preparing a plate for optimizing development parameters of a polymer flooding block in a Class II oil layer; and / or, The scope of use of the plate covers the polymer flooding development conditions with a river channel sand body width of 100m-700m and a polymer flooding well pattern spacing of 100m-200m.

5. The method for using the method chart for optimizing the development parameters of the second type oil layer polymer flooding block according to claim 4 is characterized by: Based on the prepared chart, the reasonable range of the third parameter is determined according to two existing parameters of the three parameters of the actual block, namely, the river channel width, the sand body connectivity ratio, and the polymer flooding injection-production well spacing.

6. The method for using the method chart for optimizing the development parameters of the second type oil layer polymer flooding block according to claim 5 is characterized by: Use the prepared chart to optimize the injection-production well spacing; The specific method for optimizing the injection-production well spacing using the prepared chart is: Use the chart to optimize the injection-production well spacing. Once the channel scale of the block's reservoir development and the expected connectivity ratio between the channel and inter-channel sand bodies are determined, the corresponding injection-production well spacing range can be read from the chart. Optimize and adjust the block well network spacing based on the read injection and production well spacing range.

7. The method for using the method chart for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 4 is characterized in that: Use the prepared plates to optimize the development layers.

8. The method for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 7, characterized in that: The method for optimizing development horizons using the prepared plates is as follows: After determining the well pattern spacing of the block and the expected connectivity ratio between the channel and the inter-channel sand bodies, the corresponding channel width is read from the chart; The development layer is selected based on the river width at different layers in the block.

9. The method for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 4, characterized in that: The prepared plate is used to determine the connectivity ratio of the sand body.

10. The method for optimizing development parameters of a Class II oil layer polymer flooding block according to claim 9, characterized in that: The method for judging the connectivity ratio of sand bodies using the prepared plate is as follows: After determining the well pattern and spacing of the block and the scale of the river channel in the development layer, the corresponding connectivity ratio of the river channel and inter-channel sand bodies can be read from the chart; The read sand body connectivity ratio provides a reference for the next adjustment.

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