CN107448197B - Method for quantitatively identifying spatial development of channeling channel of marine sandstone reservoir - Google Patents
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Abstract
A method for quantitatively identifying the development of the channeling channel space of a marine sandstone reservoir comprises the steps of sequentially finishing quantitative identification of the development of the channeling channel space of the marine sandstone reservoir from three steps among a water injection well, a production well and an injection and production well according to reservoir description data, dynamic production data and test monitoring data.
Description
Technical Field
The invention belongs to the technical field of oil reservoir engineering, and particularly relates to a method for quantitatively identifying the development of a channeling channel space of a marine sandstone oil reservoir.
Background
The identification method of the channeling channel starts earlier in foreign research, but is more directed at a water-drive primary high-permeability channel developed by a crack and a high-permeability layer formed by a carbonate reservoir due to a diagenesis effect, the research development in China is quicker and more mature, but main research objects are basically carried out on a secondary high-permeability channel of an east continental facies water-drive sandstone reservoir, the space channeling characteristic caused by a complex seepage barrier of the marine facies sandstone reservoir is not considered, and a channeling channel identification system and method suitable for the marine facies sandstone reservoir are established. In addition, for a massive thick-layer sandstone reservoir of a sea phase, the subsequent optimization of the profile control water plugging interval cannot be met by identifying a small-level.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for quantitatively identifying the development of the channeling channel space of the marine sandstone reservoir, aiming at the difficulty of identifying the spatial channeling caused by the complex seepage barrier of the marine sandstone reservoir, the method is used for sequentially completing the quantitatively identifying the development of the channeling channel space of the marine sandstone reservoir from three steps among a water injection well, a production well and an injection and production well by using reservoir description and reservoir engineering means based on reservoir description data, dynamic production data and test monitoring data.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for quantitatively identifying the development of a cross-flow channel space of a marine sandstone reservoir comprises the following steps:
1) determination of development horizon and depth of channeling channel of water injection well
Identification of development position and depth of a water injection well channeling channel is combined with static geological physical property analysis and dynamic development characteristic analysis, and specifically used data or indexes comprise small-layer permeability, formation coefficient, lithofacies description data, water absorption profile data, small-layer layered split production data, and water absorption index and water injection indication curves;
2) determination of production well cross-flow channel development horizon and depth
Identification of development position and depth of a cross flow channel of a production well is combined with static geological physical property analysis and dynamic development characteristic analysis, and specifically used data or indexes comprise small-layer permeability, formation coefficient, lithofacies description data, small-layer layering splitting data, production fluid index, water content curve, historical measure data, flooding layer interpretation data and a comprehensive interpretation map;
3) identification of development horizon depth and type of cross-flow channel between injection wells and production wells
Because one production well may be affected by a plurality of water injection wells, the same water injection well corresponds to a plurality of production wells, the two steps thus define the possible developed horizons and depths of the water injection well and the corresponding production well cross-flow channels, cannot ensure that a cross flow channel can be developed between the two wells, and needs to combine the tracer information between the wells and the water drive front information to determine the communication degree between the two wells, in addition, because the inter-well seepage barrier development of the marine sandstone reservoir is discontinuous, interlayer channeling can be caused, whether a cross-layer development channeling channel exists between different layers or not is determined according to inter-well seepage barrier description data, two major types and three minor types of inter-well channeling channel development types are adopted, namely a channeling channel bedding development type and a channeling channel cross-layer development type respectively, wherein the latter is divided into upward development type of the basic layer of the channeling channel and downward development type of the basic layer of the channeling channel.
The identification of the development horizon and the development depth of the water injection well cross flow channel comprises the following steps:
1) comparison of physical Properties between layers
Drawing a permeability and formation coefficient longitudinal distribution graph according to the depth level of the small layer, and analyzing the longitudinal physical property heterogeneous degree to integrally know whether the target well has a geological foundation of a development cross flow channel and a possibly developed layer, wherein the cross flow channel is easier to develop if the longitudinal permeability or the formation coefficient has large change or a well with local small layer permeability or higher formation coefficient exists;
2) longitudinal sedimentary facies contrast
Drawing a longitudinal sedimentary facies distribution map according to the depth level of the inner part of the small layer, and further determining the specific depth of the channeling channel which is possibly developed in the inner part of the small layer according to the facies types of different depths in the inner part of the small layer, wherein the better the facies property is, the easier the channeling channel is to develop;
3) comparison of relative water absorption profiles of water injection well
In order to meet the requirement of identification precision, firstly, a relative water absorption profile of the water injection well needs to be reprocessed and drawn at a depth level of one meter inside a small layer, and meanwhile, the depth of a main water absorption layer of the water injection well inside the small layer and the depth of a channeling channel which is easy to develop of the water injection well are comprehensively determined by combining the permeability of the water injection well section or the depth of a layer with a larger number of strata, the depth of a layer where the optimal rock facies inside the small layer is located, historical water absorption layer sections and the heterogeneity change of the water absorption profile;
4) dynamic analysis of water injection well production
Firstly, drawing a water injection well layered water injection curve graph and an accumulated histogram, further demonstrating the small layer of the channeling channel easy to develop from the change of the water absorption of the small layer and the magnitude of the accumulated water injection, then determining whether the well dynamically shows the characteristics of the channeling channel easy to develop according to a water absorption index curve and a water injection indication curve, if the water absorption index later period is increased and the water injection indication curve shows that the water absorption capacity of the later period is enhanced, then proving that the channeling channel is possible to develop by the well, and if the channeling channel is possible to develop by the well is dynamically displayed, determining the horizon where the channeling channel is possible to develop from the angle of the water injection well as the horizon depth determined in the step 3).
The identification of the development horizon and the development depth of the production well cross-flow channel comprises the following steps:
1) comparison of physical Properties between layers
Drawing a permeability and formation coefficient longitudinal distribution graph according to the depth level of the small layer, and analyzing the longitudinal physical property heterogeneous degree to integrally know whether the target well has a geological foundation of a development cross flow channel and a possibly developed layer, wherein the cross flow channel is easier to develop if the longitudinal permeability or the formation coefficient has large change or a well with local small layer permeability or higher formation coefficient exists;
2) longitudinal sedimentary facies contrast
Drawing a longitudinal sedimentary facies distribution map according to the depth level of the inner part of the small layer, and further determining the specific depth of the channeling channel which is possibly developed in the inner part of the small layer according to the facies types of different depths in the inner part of the small layer, wherein the better the facies property is, the easier the channeling channel is to develop;
3) production well production dynamics analysis
Firstly, drawing a production well layered liquid production curve graph and an accumulated histogram, further demonstrating the small layer of the channeling channel easy to develop from the change of the small layer liquid production and the magnitude of the accumulated liquid production, then determining whether the well shows the characteristics of the channeling channel easy to develop or not in the dynamic state according to a liquid production index curve and a historical water content curve, and if the late stage of a liquid production index rises and the water content rises suddenly, proving that the well can develop the channeling channel, and when analyzing the sudden rise of the water content, combining historical measure data including hole filling plugging and acidification data, and removing the sudden change of the water content caused by a water flooded layer according to longitudinal water flooded layer explanation data, and finally obtaining the specific horizon and depth of the channeling channel possible to develop of the production well according to the analysis;
4) production well channeling channel development depth determination
The development depth of the cross-flow channel identified in the three steps is not fine enough, so that the specific depth of the cross-flow channel possibly developed by the production well is finally determined according to the perforation section data and the permeability peak value data in the map by combining the production well comprehensive interpretation map data.
The invention has the beneficial effects that:
the method provided by the invention can be used for judging the connectivity of the channeling channel in the sequence and across layers under different seepage barriers, and the accuracy of development depth identification is improved to 1-2m in the small layer.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a diagram of a marine sandstone reservoir formation well pattern and I1 and I2 well group profiles in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the drawings and examples, but the present invention is not limited to the following examples.
The Tarim marine sandstone reservoir DH has a cross-flow channel formed in long-term waterflood development, and has 14 small layers, 01, 02, 11, 12, 13, 21, 22, 31, 32, 4, 51, 52, 53 and 6 respectively, which are developed from top to bottom. The method provided by the invention is used for explaining how to identify the development area and the perforation depth of the cross-flow channel by taking I1 and I2 typical well groups as examples. The I1 injection and production well group comprises 4 production wells P1, P2, P3 and P4 (since the wells are horizontal wells and the production level is only one layer, cross-flow channel identification analysis is not performed), and the I2 injection and production well group comprises 4 production wells P5, P6, P7 and P8, and the specific well position distribution is shown in FIG. 2.
Example 1
According to the method disclosed by the invention, a permeability and formation coefficient longitudinal distribution diagram, a sedimentary facies longitudinal distribution diagram, a water injection well relative water absorption profile, a water injection well stratified water injection quantity curve diagram and an accumulative histogram are respectively drawn at a small depth level, so that 5799.65-5800.65m of a water injection well I1 well in a 21 layer, 5825.39-5827.37m of a 32 layer and a 5835.29-5836.28m development cross flow channel of a 4 layer can be obtained.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution graph, a sedimentary facies longitudinal distribution graph, a production well layered liquid production curve graph and a cumulative histogram are respectively drawn at a small layer depth level, and a production well comprehensive interpretation graph is obtained, so that the specific depth of a possible development cross flow channel of a production well P1 is 5783.00-5787.25m of 32 layers and 5798.15-5799.95m of 4 layers.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution diagram, a sedimentary facies longitudinal distribution diagram, a production well layered liquid production curve diagram, a cumulative histogram and a production well comprehensive interpretation diagram are respectively drawn at a small layer depth level, and 5801.32-5803.32m of 32 layers of possible development cross flow channels of a production well P2 can be obtained.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution graph, a sedimentary facies longitudinal distribution graph, a production well layered liquid production curve graph and a cumulative histogram are respectively drawn at a small layer depth level, and a production well comprehensive interpretation graph is obtained, so that the specific depth of a production well P3 possible development cross flow channel is 5749.10-5751.95m of 21 layers and 5761.65-5764.30m of 22 layers.
According to the method of the invention, the water injection well I1 develops cross-flow channels at 21, 32 and 4 layers, the production well P1 develops cross-flow channels at 32 and 4 layers, and according to the description information of the inter-well seepage barrier, the bottom of the 22 layers and the bottom of the 32 layers between the wells completely shield the seepage barrier, so that the cross-flow channel between the two wells can only develop in an antenatal manner, namely the 32 layers of the water injection well and the 32 layers of the production well, the 4 layers of the water injection well and the 4 layers of the production well.
According to the method of the invention, the development cross-flow channels of the water injection wells I1 at 21, 31 and 4 layers can be obtained, the development cross-flow channel of the production wells P2 at 32 layers can be obtained, according to the description information of the inter-well seepage barriers, the bottom of the 22 layers and the top of the 4 layers of the inter-well completely shield the seepage barriers, and therefore, the cross-flow channels between the two wells can only be of an antenatal development type, namely 32 layers of the water injection wells and 32 layers of the production wells.
According to the method of the invention, the water injection well I1 develops cross-flow channels at 21, 31 and 4 layers, the production well P3 develops cross-flow channels at 21 and 22 layers, and the cross-flow channels at the bottom of 21 layers and the top of 31 layers between the wells completely shield the cross-flow barriers according to the description information of the cross-flow barriers between the wells, so that the cross-flow channels between the two wells are of an bedding development type and a cross-layer development type (the layer is downward), namely the 21 layers of the water injection well and the 21 layers of the production well, the 21 layers of the water injection well and the 22 layers of the production well.
According to the invention content method, the depth and type of the development horizon of the channeling channel of the injection and production well group I1 are shown in the table 1, the well group develops 5 groups of channeling channels in total, the development types are respectively the channeling channel bedding development type and the channeling channel cross-layer development type (the layer is downward), and the horizon depth identification precision reaches 1-2 m.
Example 2
As described in the invention content method, a permeability and formation coefficient longitudinal distribution graph, a sedimentary facies longitudinal distribution graph, a water injection well relative water absorption profile, a water injection well layered water injection rate graph and an accumulated histogram are respectively drawn in a small-layer depth level, and a 5856-5857m development cross flow channel of a water injection well I2 well in 31 layers can be obtained.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution diagram, a sedimentary facies longitudinal distribution diagram, a production well layered liquid production curve diagram and a cumulative histogram are respectively drawn at a small layer depth level, and a production well comprehensive interpretation diagram can obtain the specific depth of a production well P5 possible development cross flow channel, namely 5776.07-5780.31m of 21 layers, 5786.42-5792.39m of 22 layers and 5803.72-5808.19m of 32 layers.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution diagram, a sedimentary facies longitudinal distribution diagram, a production well layered liquid production curve diagram, a cumulative histogram and a production well comprehensive interpretation diagram are respectively drawn at a small layer depth level, and 5812.10-5814.60m of 32 layers of possible development cross flow channels of a production well P6 can be obtained.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution graph, a sedimentary facies longitudinal distribution graph, a production well layered liquid production curve graph, a cumulative histogram and a production well comprehensive interpretation graph are respectively drawn at a small layer depth level, and 5798.48-5802.12m and 5805.51-5810.28m of 21 layers of possible development cross-flow channels of a production well P7 can be obtained.
As described in the invention content method, a permeability and formation coefficient longitudinal distribution graph, a sedimentary facies longitudinal distribution graph, a production well layered liquid production curve graph, a cumulative histogram and a production well comprehensive interpretation graph are respectively drawn at a small layer depth level, and 5756.32-5761.48m and 5762.72-5766.08m of 21 layers of possible development cross-flow channels of a production well P8 can be obtained.
According to the method of the invention, a 31-layer development channeling channel of a water injection well I2 and 21, 22 and 32-layer development channeling channels of a production well P5 can be obtained, according to the description information of the inter-well seepage barrier, a complete shielding type interlayer is developed at the top of a 31-layer inter-well, and a partial shielding type interlayer is developed at the bottom of a 31-layer inter-well, so that the 31-layer inter-well cannot develop the channeling channel upwards, and the channeling channel between two wells can only be a cross-layer (downward) development type, namely 31 layers of the water injection well and 32 layers of the production well.
According to the method of the invention, a water injection well I2 developing channeling channel in 31 small layers can be obtained, a production well P6 developing channeling channel in 32 small layers can be obtained, and according to the description information of the inter-well seepage barrier, a partial shielding type interlayer is developed at the bottom of 31 layers between wells, so that 31 layers can develop channeling channels downwards, and the channeling channels between two wells can only be of a cross-layer (downward layer) development type, namely 31 small layers of the water injection well and 32 small layers of the production well.
According to the method of the invention, a water injection well I2 developing channeling channel in 31 layers can be obtained, a production well P7 developing channeling channel in 21 layers can be obtained, and according to the description information of the inter-well seepage barrier, a totally shielding type interlayer is developed at the top of 31 layers between wells, so that 31 layers cannot develop channeling channels upwards, and the channeling channels cannot be developed between two wells.
According to the method of the invention, a water injection well I2 developing channeling channel in 31 layers can be obtained, a production well P8 developing channeling channel in 21 layers can be obtained, and according to the description information of the inter-well seepage barrier, a totally shielding type interlayer is developed at the top of 31 layers between wells, so that 31 layers cannot develop channeling channels upwards, and the channeling channels cannot be developed between two wells.
According to the invention content method, the development horizon depth and type of the channeling channel of the injection-production well group I2 are shown in the table 2, the well group develops 2 groups of channeling channels in total, the development types are all cross-layer development types (the current layer is downward) of the channeling channels, and the horizon depth identification precision reaches 1-2 m.
Claims (1)
1. A method for quantitatively identifying the development of a cross-flow channel space of a marine sandstone reservoir is characterized by comprising the following steps of:
step 1, determining development horizon and depth of channeling channel of water injection well
Identification of development position and depth of a water injection well channeling channel is combined with static geological physical property analysis and dynamic development characteristic analysis, and specifically used data or indexes comprise small-layer permeability, formation coefficient, lithofacies description data, water absorption profile data, small-layer layered split production data, and water absorption index and water injection indication curves;
the identification of the development horizon and the development depth of the water injection well cross flow channel comprises the following steps:
1) comparison of physical Properties between layers
Drawing a permeability and formation coefficient longitudinal distribution graph according to the depth level of the small layer, and analyzing the longitudinal physical property heterogeneous degree to integrally know whether the target well has a geological foundation of a development cross flow channel and a possibly developed layer, wherein the cross flow channel is easier to develop if the longitudinal permeability or the formation coefficient has large change or a well with local small layer permeability or higher formation coefficient exists;
2) comparing longitudinal sedimentary facies differences;
drawing a longitudinal sedimentary facies distribution map according to the depth level of the inner part of the small layer, and further determining the specific depth of the channeling channel which is possibly developed in the inner part of the small layer according to the facies types of different depths in the inner part of the small layer, wherein the better the facies property is, the easier the channeling channel is to develop;
3) comparing relative water absorption profiles of the water injection wells;
in order to meet the requirement of identification precision, firstly, a relative water absorption profile of the water injection well needs to be reprocessed and drawn at a depth level of one meter inside a small layer, and meanwhile, the depth of a main water absorption layer of the water injection well inside the small layer and the depth of a channeling channel which is easy to develop of the water injection well are comprehensively determined by combining the permeability of the water injection well section or the depth of a layer with a larger number of strata, the depth of a layer where the optimal rock facies inside the small layer is located, historical water absorption layer sections and the heterogeneity change of the water absorption profile;
4) dynamic production analysis of the water injection well;
firstly, drawing a water injection well layered water injection curve graph and an accumulated histogram, further demonstrating the small layer of the channeling channel easy to develop from the change of the water absorption of the small layer and the magnitude of the accumulated water injection, then determining whether the well dynamically shows the characteristics of the channeling channel according to a water absorption index curve and a water injection indication curve, if the later rise of the water absorption index and the water injection indication curve show that the water absorption capacity of the later period is enhanced, proving that the channeling channel is possible to develop by the well, and if the channeling channel is possible to develop by the well is dynamically displayed, determining the possible developing horizon of the channeling channel from the angle of the water injection well as the horizon depth determined in the step 3);
step 2, determining development horizon and depth of production well cross flow channel
Identification of development position and depth of a cross flow channel of a production well is combined with static geological physical property analysis and dynamic development characteristic analysis, and specifically used data or indexes comprise small-layer permeability, formation coefficient, lithofacies description data, small-layer layering splitting data, production fluid index, water content curve, historical measure data, flooding layer interpretation data and a comprehensive interpretation map;
the identification of the development horizon and the development depth of the production well cross-flow channel comprises the following steps:
1) comparison of physical property differences between layers:
drawing a permeability and formation coefficient longitudinal distribution graph according to the depth level of the small layer, and analyzing the longitudinal physical property heterogeneous degree to integrally know whether the target well has a geological foundation of a development cross flow channel and a possibly developed layer, wherein the cross flow channel is easier to develop if the longitudinal permeability or the formation coefficient has large change or a well with local small layer permeability or higher formation coefficient exists;
2) longitudinal sedimentary facies difference comparison:
drawing a longitudinal sedimentary facies distribution map according to the depth level of the inner part of the small layer, and further determining the specific depth of the channeling channel which is possibly developed in the inner part of the small layer according to the facies types of different depths in the inner part of the small layer, wherein the better the facies property is, the easier the channeling channel is to develop;
3) production dynamic analysis of the production well:
firstly, drawing a production well layered liquid production curve graph and an accumulated histogram, further demonstrating the small layer of the channeling channel easy to develop from the change of the small layer liquid production and the magnitude of the accumulated liquid production, then determining whether the well shows the characteristics of the channeling channel easy to develop or not in the dynamic state according to a liquid production index curve and a historical water content curve, and if the late stage of a liquid production index rises and the water content rises suddenly, proving that the well can develop the channeling channel, and when analyzing the sudden rise of the water content, combining historical measure data including hole filling plugging and acidification data, and removing the sudden change of the water content caused by a water flooded layer according to longitudinal water flooded layer explanation data, and finally obtaining the specific horizon and depth of the channeling channel possible to develop of the production well according to the analysis;
4) determining the development depth of a production well channeling channel:
the development depth of the cross flow channel identified in the three steps is not fine enough, so that the development depth of the cross flow channel is finally determined according to the perforation section data and the permeability peak value data in the map by combining the production well comprehensive interpretation map data;
step 3, identifying the depth and type of the development horizon of the cross flow channel between injection wells and production wells
Because one production well may be affected by a plurality of water injection wells, the same water injection well corresponds to a plurality of production wells, the two steps thus define the possible developed horizons and depths of the water injection well and the corresponding production well cross-flow channels, cannot ensure that a cross flow channel can be developed between the two wells, and needs to combine the tracer information between the wells and the water drive front information to determine the communication degree between the two wells, in addition, because the inter-well seepage barrier development of the marine sandstone reservoir is discontinuous, interlayer channeling can be caused, whether a cross-layer development channeling channel exists between different layers or not is determined according to inter-well seepage barrier description data, two major types and three minor types of inter-well channeling channel development types are adopted, namely a channeling channel bedding development type and a channeling channel cross-layer development type respectively, wherein the latter is divided into upward development type of the basic layer of the channeling channel and downward development type of the basic layer of the channeling channel.
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