CN113721298B - Reservoir prediction description method for underwater diversion river channel at deposition end - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008021 deposition Effects 0.000 title claims abstract description 19
- 238000003892 spreading Methods 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 238000000151 deposition Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 claims abstract description 11
- 208000035126 Facies Diseases 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims abstract description 8
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 239000002356 single layer Substances 0.000 claims description 52
- 239000013049 sediment Substances 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 20
- 239000004576 sand Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
- G01V1/50—Analysing data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/61—Analysis by combining or comparing a seismic data set with other data
- G01V2210/616—Data from specific type of measurement
- G01V2210/6169—Data from specific type of measurement using well-logging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/60—Analysis
- G01V2210/62—Physical property of subsurface
- G01V2210/624—Reservoir parameters
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Abstract
The invention provides a reservoir prediction description method of a deposition end underwater diversion river course, which is characterized in that through logging phase characteristics and production characteristics, known river courses in different areas are obtained in each small layer longitudinally drilled by logging relative to a single well, and a spreading chart of the known river course is obtained; the other areas outside the known river channel are unknown river channels; predicting the spreading diagram of the unknown river channels on other small layers by copying the known river channels to the unknown river channels corresponding to other small layers by using the inheritance principle of the sedimentary facies; by using the principle of the difference of the sedimentary facies, the material source supply in each sedimentary period is changed, and the width and the length of an unknown river channel are corrected by combining the well region well drilling situation; and correcting all unknown riverways to obtain the exhibition patterns of all riverways of all small layers, and carrying out plane and longitudinal riverway comparison correction on abnormal well points to obtain the three-dimensional exhibition condition of the whole riverway space.
Description
Technical Field
The invention belongs to the field of reservoir spread description of a deposition end, and particularly relates to a reservoir prediction description method of an underwater diversion river channel of the deposition end.
Background
At present, the reservoir prediction description technology mainly utilizes information provided by seismic data to carry out three major categories of seismic inversion methods, seismic attribute analysis technologies, AVO technologies and the like. But reservoir thicknesses typically need to be over 10 meters to be identifiable and traceable. For the prediction of a thin sand layer, the single-layer thickness is generally far lower than the resolution capability of earthquake resolution, and the sediment characteristics and the like of the reservoir cannot be well described by utilizing the earthquake-related reservoir description technology, so that the reservoir with a thinner sand body and a smaller area is difficult to describe, and no better method exists at present.
Disclosure of Invention
The invention aims to solve the technical problems that: a reservoir prediction description method for a deposition end underwater diversion river channel is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a reservoir prediction description method of a sediment end underwater diversion river course comprises the following steps:
s1, determining a known river course:
the method comprises the steps of respectively obtaining known riverways in different areas in each single layer of a longitudinal drilling well of a logging relative to a single well through the logging phase characteristics and the production characteristics of a deposition end underwater diversion riverway to obtain a spreading chart of the known riverways; the other areas outside the known river channel are unknown river channels;
s2, predicting unknown river channels:
by applying the principle of inheritance of a sedimentary facies, a single-layer river channel has inheritance in the longitudinal direction of a single layer where a known river channel is located, and the spreading diagram of the unknown river channel in other single layers is predicted by copying the known river channel to the unknown river channel corresponding to other single layers;
s3, correcting an unknown river channel:
by using the principle of the difference of the sedimentary facies, the material source supply in each sedimentary period is changed, and the width and the length of an unknown river channel are corrected by combining the well region well drilling situation and the spreading diagram of the unknown river channel obtained in the step S2;
s4, summarizing river spreading:
and correcting all unknown riverways to obtain a spreading diagram of each riverway of each monolayer, and carrying out plane and longitudinal riverway comparison and correction on abnormal well points to obtain the three-dimensional spreading condition of the whole riverway space.
According to the method, the step S1 comprises the following steps: and carrying out deposition microphase classification according to each single layer of the longitudinal drilling of the logging relative to the single well, and determining the deposition microphase classification of each single layer of the single well.
According to the above method, the step S1 further includes: and combining the production dynamic conditions, and selecting the most developed area in each monolayer as a known river channel.
According to the method, the step S3 comprises the following steps: the actual drilling and encountering conditions of the single layer where the unknown river is located are marked by combining the actual drilling and encountering conditions, the material source supply conditions and the logging display conditions, so that the river spreading of the single layer where the unknown river is located is corrected, and then the left and right correction of the river is performed according to logging phase characteristics.
According to the above method, the step S3 further includes: and judging the single-layer material source supply according to the actual drilling condition of the single layer where the unknown river channel is, and correcting the extension length of the river channel by combining the actual logging display condition.
The other monolayers are adjacent monolayers in the above-described manner.
The beneficial effects of the invention are as follows: the method provides a clear prediction method for the reservoir of the underwater diversion river course with thinner sand bodies and smaller area, reduces the depicting difficulty, provides a new finding thought for hidden trap at the deposition end of the river course, and has important guiding significance for developing reasonable policies for the next development of the oil reservoir of the type.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the invention.
FIG. 2 is a diagram of a known river course layout for individual layers of LX field 1 oil groups.
FIG. 3 is a flow chart of a copy prediction channel.
Fig. 4 is a plot of individual layer sandstone thickness drilling of LX field 1 oil group.
FIG. 5 is a view showing the oil and gas exposure of each single-layer drill of LX oilfield 1 oil group.
FIG. 6 is a prediction graph of the spread of each single-layer river channel of LX oilfield 1 oil group.
Detailed Description
The invention will be further described with reference to specific examples and figures.
The invention provides a reservoir prediction description method of a deposition end underwater diversion river, as shown in fig. 1, comprising the following steps:
s1, determining a known river course:
the method comprises the steps of respectively obtaining known riverways in different areas in each single layer of a longitudinal drilling well of a logging relative to a single well through depositing the logging phase characteristics and the production characteristics of the underwater diversion riverways at the tail end, and obtaining a spreading chart of the known riverways; the other areas other than the known river are unknown river. The method comprises the following steps: according to the method, sediment microphase division is carried out on each single layer when a logging relative to a single well longitudinally drills, sediment microphase classification of each single layer of the single well is defined, and the most developed area in each single layer is selected as a known river channel in combination with production dynamic conditions.
The waterline shunts the river sand body, the center of the river is a box type or a bell type, and according to the characteristics, the center area of the river and the edge area of the river are judged; the production situation shows that the initial single well and the accumulated production of the central well of the river channel are higher, the side edges of the central well of the river channel are inferior, and the production well at the side edge of the river channel is worst. And (5) summarizing and inducing the characteristics of the sediment end river channel sand to draw a known river channel.
In this example, 1 oil group of LX oil field is selected, the oil group is divided into 5 monolayers, and known river channels are respectively depicted in each monolayer. 6 river channels are numbered sequentially from north to south, wherein the river channel No. 1 is most developed when meeting the reservoir layer in the layer III, and therefore the plane layout of the river channel No. 1 which is most developed in the layer III deposition period is determined. Finding out the layers in other areas in the same way, confirming that the layers are developed and the reservoir spread of the known river channel, and ensuring that the No. 2 river channel is developed in the No. III layer and the No. IV layer; the river channel No. 3 develops in the layer III and IV; the river channel No. 4 develops in layers I, II and IV; the river channel No. 5 is developed in the layer IV; the No. 6 river channel is developed in the layers I, II, III and V, as shown in the figure 2.
S2, predicting unknown river channels:
by applying the principle of inheritance of sedimentary facies, the reservoir river channels have inheritance in the longitudinal direction of the single layer where the known river channel is located, and the distribution diagram of the unknown river channels in other single layers is predicted by copying the known river channel to the unknown river channels corresponding to other single layers. To improve accuracy, the other monolayers are typically adjacent monolayers.
The deposition study shows that the region belongs to a very stable river-lake basin deposition system, the end of the material source supply has small change, and river channel sand in different deposition periods has inheritance. For example, as shown in fig. 3, the planar spreading area of the river channel No. 1 in the layer iii is copied to the adjacent layers No. ii and iv, so as to obtain the predicted river channel planar spreading pattern of the river channel No. 1 in the layers ii and iv, and other river channels are obtained in the same way.
S3, correcting an unknown river channel:
by using the principle of the difference of the sedimentary facies, the material source supply in each sedimentary period is changed, and the width and the length of the unknown river channel are corrected by combining the well region well drilling situation and the spreading diagram of the unknown river channel obtained in the step S2. The method comprises the following steps: marking the actual drilling conditions of the single layer where the unknown river is located by combining the actual drilling conditions, the material source supply conditions and the logging display conditions, so that the river spreading of the single layer where the unknown river is located is corrected, and then the left and right correction of the river is performed according to logging phase characteristics; and judging the single-layer material source supply according to the actual drilling condition of the single layer where the unknown river channel is, and correcting the extension length of the river channel by combining the actual logging display condition.
According to the principle of difference of the deposition phases: the development degree of the river channel of different single-layer sand bodies is different, and the spreading area is different. And correcting the river channel migration position and the extension length by combining the actual drilling condition, the material source supply condition, the logging display condition and the like. Firstly, confirming the river channel migration position and the distribution area. The actual drilling conditions of the single layer of the predicted river course plane distribution are marked, so that the river course distribution is corrected at the single layer, and the river course left and right correction is performed according to the river course logging phase characteristics, as shown in fig. 4. And judging the single-layer material source supply according to the single-layer drilling condition, and correcting the river channel extension length according to the actual logging display condition, as shown in fig. 5.
In this embodiment, the reservoir drilling conditions of the drilled wells on each monolayer are combined to identify the reservoir drilling conditions which are approximately located at the center, the side edges of the center or the boundary of the channel, and the like, and then the logging display conditions are collected to perform distribution of the whole of the plurality of channels on a plane, the left-right migration rule of the channels and the extension distance of the channels.
S4, summarizing river spreading:
and correcting all unknown riverways to obtain a spreading diagram of each riverway of each monolayer, and carrying out plane and longitudinal riverway comparison and correction on abnormal well points to obtain the three-dimensional spreading condition of the whole riverway space.
After the riverway positions of different areas are duplicated and corrected through the known riverway of each monolayer, the monolayer is formed into a reservoir plane distribution condition by a plurality of unconnected riverway sand, so that a new trap is formed in an unknown area, as shown in fig. 6.
This embodimentThrough experiments in LX oil fields, better results are obtained, 2, 3, 5 and 6 additional storage potential layers of the new lower 3 oil groups are implemented in total, and the newly increased oil-containing area is expected to be 4.5km 2 Newly-increased predicted reserves 49.8X10 4 t. Wherein, the newly-placed No. 2 monolayer of 3 and L1-8-5 drill into 5m oil layer, the highest daily oil production at the initial stage of production is 12t, and the newly-increased oil-containing area is expected to be 0.26 km 2 Newly increased reserve 20.34×10 4 t. New 3 No. 5 single layer, L1-9-3 drill meeting oil layer 4.5m, highest daily oil production 9.5t in initial stage of production, and expected newly increased oil containing area 0.1 km 2 New reserve 7.4X10 4 t。
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (7)
1. A reservoir prediction description method of a sediment end underwater diversion river is characterized by comprising the following steps of: the method comprises the following steps:
s1, determining a known river course:
the method comprises the steps of respectively obtaining known riverways in different areas in each single layer of a longitudinal drilling well of a logging relative to a single well through the logging phase characteristics and the production characteristics of a deposition end underwater diversion riverway to obtain a spreading chart of the known riverways; the other areas outside the known river channel are unknown river channels;
s2, predicting unknown river channels:
by applying the principle of inheritance of a sedimentary facies, a single-layer river channel has inheritance in the longitudinal direction of a single layer where a known river channel is located, and the spreading diagram of the unknown river channel in other single layers is predicted by copying the known river channel to the unknown river channel corresponding to other single layers; the other monolayers are adjacent monolayers;
s3, correcting an unknown river channel:
by using the principle of the difference of the sedimentary facies, the material source supply in each sedimentary period is changed, and the width and the length of an unknown river channel are corrected by combining the well region well drilling situation and the spreading diagram of the unknown river channel obtained in the step S2;
s4, summarizing river spreading:
and correcting all unknown riverways to obtain a spreading diagram of each riverway of each monolayer, and carrying out plane and longitudinal riverway comparison and correction on abnormal well points to obtain the three-dimensional spreading condition of the whole riverway space.
2. The method according to claim 1, characterized in that: the S1 comprises the following steps:
and carrying out deposition microphase classification according to each single layer of the longitudinal drilling of the logging relative to the single well, and determining the deposition microphase classification of each single layer of the single well.
3. The method according to claim 2, characterized in that: the S1 further comprises: and combining the production dynamic conditions, and acquiring the most developed area in each monolayer as a known river channel.
4. The method according to claim 1, characterized in that: the S3 comprises the following steps: the actual drilling and encountering conditions of the single layer where the unknown river is located are marked by combining the actual drilling and encountering conditions, the material source supply conditions and the logging display conditions, so that the river spreading of the single layer where the unknown river is located is corrected, and then the left and right correction of the river is performed according to logging phase characteristics.
5. The method according to claim 4, wherein: the step S3 further comprises the following steps: and judging the single-layer material source supply according to the actual drilling condition of the single layer where the unknown river channel is, and correcting the extension length of the river channel by combining the actual logging display condition.
6. The method according to claim 1, characterized in that: when the logging phase is characterized by a box shape or a bell shape, the corresponding known river channel is obtained to be a central area or a side area of the river channel.
7. The method according to claim 1, characterized in that: in the step S1, the initial stage of a single well of a central well of a river channel and the accumulated production are higher, the side edges of the central side of the river channel are inferior, and the production well at the side of the river channel is worst according to the current production situation.
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