CN114114461A - Submarine fan sand-rich risk evaluation method and device based on continental margin classification - Google Patents
Submarine fan sand-rich risk evaluation method and device based on continental margin classification Download PDFInfo
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Abstract
The invention provides a submarine fan sand-rich risk evaluation method and device based on land edge classification, which comprises the following steps: judging whether the climate forming background period of the target submarine fan is an ice house climate period or a greenhouse climate period according to the geological age of the target submarine fan; identifying land frame slope break points of which the stratum seismic reflection in the target seabed sector is changed from continuous reflection steepness to chaotic reflection and the slope is changed from flat to steep, and connecting lines of the series land frame slope break points between an initial land frame slope break point and a last land frame slope break point corresponding to the development period of the target seabed sector to obtain a fan-shaped land frame slope break migration track of the target seabed; and (4) carrying out sand-rich risk evaluation on the submarine fan by combining the climate background period and the slope-fold migration trajectory of the land frame. The method can realize the rapid evaluation of the sand-rich risk level of the submarine fan through the slope-fold migration trajectory of the land frame and the formation of the climate background period under the condition of only seismic data, is not limited by an application scene, and enables the sand-rich risk evaluation of the submarine fan to be more accurate.
Description
Technical Field
The invention belongs to the technical field of seismic exploration and development, and particularly relates to a submarine fan sand-richness risk evaluation method and device based on land edge classification.
Background
Deep-sea water channel reservoirs have continuously gained important exploration findings in recent years and are an important reservoir type for marine oil and gas exploration. Compared with the onshore river-delta sand body, the deep sea water channel reservoir is more complex in the aspects of stacking patterns, cutting and stacking relations, distribution patterns, heterogeneity and the like formed by deposition, and the characterization and evaluation of the sand body are very challenging. How to realize the fine characterization and the rapid evaluation of the deep-sea water channel reservoir is the core key of the efficient exploration and development of the water channel reservoir. The currently common water channel reservoir characterization and evaluation methods mainly comprise two main categories, including a classification method water channel reservoir evaluation method and a well-constrained water channel reservoir characterization technology. The core connotation of the classification method for evaluating the water channel reservoir is that the deep-sea water channels are divided into different types according to 'geometric parameters, erosion capacity, limiting conditions, development period times, external forms and internal structures' of the deep-sea water channels, the sand-rich property of the deep-sea water channels is further evaluated, and the deep-sea water channels are divided into straight water channels, low-curvature water channels and high-curvature water channels according to the curvatures; the sand content of the straight water channel is high, the sand content of the low-camber water channel is medium, and the sand content of the high-camber water channel is low, so that the evaluation method is difficult to realize effective characterization of the phase zone in the deep-sea water channel, and the accuracy of the obtained evaluation result is low.
The core connotation of the well-constrained water channel reservoir delineation technology is to fully excavate water channel filling rock elastic information contained in drilling data, and further establish a corresponding relation between water channel filling rock physical information and seismic attributes through the elastic parameters to acquire lithology and reservoir information of the deep-sea water channel. However, the well-constrained water channel reservoir characterization technology seriously depends on well logging data as a constraint condition to invert seismic data to obtain high-resolution water channel sedimentary wave impedance information, is difficult to apply to the conditions of no well or few wells, and has a limited application range.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides a submarine fan sand-rich risk evaluation method and device based on continental rise classification, and aims to solve the technical problems of limited application scenarios and low evaluation accuracy of a deep-sea water channel reservoir evaluation method in the prior art.
In order to achieve the above object, the present invention provides a method for evaluating sand-richness risk of a submarine fan based on continental margin classification, the method comprising:
step S1, acquiring the geological age of a target submarine fan according to seismic data, and judging whether the climate forming background period of the target submarine fan is an ice-house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
step S2, identifying land frame slope break points of which the stratum seismic reflection changes from continuous reflection steepness to chaotic reflection and the slope changes from flat to steep, and sending the target seabed sector into a series of land frame slope break point connecting lines between an initial land frame slope break point and a last land frame slope break point corresponding to a development period to obtain a fan-shaped land frame slope break migration track of the target seabed;
and step S3, carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
In an embodiment of the present invention, the method for evaluating sand-richness risk of a submarine fan based on continental margin classification further includes:
step S3 includes:
step S31, judging the fan-shaped sediment supply condition of the target seabed and the land frame accommodating space condition according to the land frame slope fold migration track;
and step S32, carrying out seabed fan sand-richness risk evaluation by combining the climate background period, the sediment supply condition and the land frame tolerable space condition.
In the embodiment of the present invention, step S31 includes:
step S311, establishing a coordinate system of the slope fold migration track of the land frame by taking the initial land frame slope fold point as the coordinate origin, wherein the X axis represents that the land frame slope fold moves along the horizontal direction, the product entering the basin is positive, the product retreating towards the land is negative, the Y axis represents that the land frame slope fold moves along the vertical direction, the product adding upwards is positive, and the product adding downwards is negative;
step S312, judging the track type of the land frame slope fold migration track;
step S313, if the land frame slope fold migration track is an ascending track, calculating a land frame slope fold accumulation speed according to the following formula:
dy is the vertical projection of the slope fold point of the initial land frame and the slope fold of the final land frame on the Y axisThe actual distance between the shadows is the land frame slope fold accumulation distance, and T is the geological age of the land frame slope fold migration track; raThe land frame slope folding and accumulating speed is obtained;
and step S314, judging the sediment supply condition of the target seabed sector according to the slope accumulation speed of the land frame.
In the embodiment of the present invention, step S31 includes:
step S315, if the land frame slope fold migration track is a descending track, calculating the land frame slope fold accumulation speed according to the following formula:
dx is the actual distance between the horizontal projection of the initial land frame slope break point and the final land frame slope break point on the X axis, RpThe folding and stacking speed of the land frame slope is adopted;
and step S316, judging the supply condition of the fan-shaped sediment of the target seabed according to the folding speed of the land frame slope.
In the embodiment of the present invention, the determination of the sediment supply condition of the target seafloor sector in step S314 is set as follows: ra>150m/My, the target subsea fan being a high Qs supplied for high velocity sediments;
Ra<150m/My, low Qs supplied by the target subsea fan for low speed sediment;
the determination of the sediment supply condition of the target seafloor sector in step S316 is set as follows: rp>10km/My, high Qs supplied by the target subsea fan for high speed sediment;
when R isp<10km/My, the target subsea fan supplies low Qs for low speed sediment.
In this embodiment of the present invention, step S31 further includes:
step S317, calculating the angle of the slope fold migration track of the land frame according to the following formula:
wherein, TseThe angle of the slope fold migration track of the land frame;
and step S318, judging the land frame accommodating space condition according to the angle of the land frame slope fold migration track.
In the embodiment of the present invention, the determination in step S318 is set as:
-2°<Tse<1 degree, the target submarine fan is a descending type land frame accommodating space with a height delta a;
1°<Tse<4 degrees, wherein the target submarine fan is a middle delta a of the slow-rising type land frame accommodating space;
4°<Tse<130 deg., the target subsea fan is a low delta a of fast-rise shelf-compatible space.
In the embodiment of the present invention, the evaluation of the sand-richness risk of the subsea fan in step S32 is set as follows:
the target seabed fan is high in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is high Qs and medium delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is low in Qs and high in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is low in Qs and medium in delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is low in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is high Qs and medium delta a, and is in a greenhouse climate period, so that the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in a greenhouse climate period, so that the sand-rich risk is low;
the target seabed fan is low in Qs and medium in delta a and is in a greenhouse climate period, so that the sand-rich risk is high;
the target subsea fan is low Qs, medium δ a and in the warm-room climate period, then the risk of sand-richness is low.
In this embodiment of the present invention, step S1 specifically includes:
step S11, identifying seismic reflection wave groups similar to the seismic reflection amplitude, frequency and continuity of the target submarine fan on the seismic data;
and step S12, tracking and comparing the target submarine fan to the existing drilling area of the adjacent region according to the similarity comparison principle, and determining the geological age of the target submarine fan according to the age information corresponding to the drilled well.
The invention also provides a submarine fan sand-rich risk evaluation device based on land edge classification, which comprises:
the image processing module is used for acquiring the geological age of the target submarine fan according to seismic data and judging whether the climate forming background period of the target submarine fan is an ice house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
the identification module is used for identifying land frame slope break points of which the stratum seismic reflection changes from continuous reflection steepness to chaotic reflection and the slope changes from flat to steep, and forming a series of land frame slope break point connecting lines between an initial land frame slope break point and a last land frame slope break point corresponding to the development period of the target seabed sector to obtain a fan-shaped land frame slope break migration track of the target seabed;
and the evaluation module is used for carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
Through the technical scheme, the submarine fan sand-rich risk evaluation method based on the land edge classification has the following beneficial effects:
the target submarine fan is divided into two categories, namely an ice-house climate period and a greenhouse climate period, under different climatic background conditions, land frame slope folding points of a stratum in the target submarine fan are further accurately identified, a plurality of land frame slope folding points are sequentially connected to form a fan-shaped land frame slope folding migration track of the target submarine, the target submarine fan and a land edge where the target submarine fan is located can be subjected to cause classification according to the fan-shaped land frame slope folding migration track of the target submarine, and then high-risk, medium-risk and low-risk evaluation is carried out on sand-rich risks of different types of submarine fans through a land edge cause type-submarine fan sand-rich risk level comparison chart. The method can realize rapid evaluation of the sand-rich risk level of the submarine fan through the slope-fold migration track of the land frame and the formation of the climate background period under the condition of only seismic data, does not need logging data as constraint conditions, is suitable for the working condition conditions of no well or few wells, is not limited by application scenes, and can accurately identify the slope-fold migration track of the land frame through image processing, so that the sand-rich risk evaluation of the submarine fan is more accurate.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
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The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a diagram illustrating the operational steps of a method for evaluating sand-richness risk of a subsea fan based on continental classification according to an embodiment of the present invention;
FIG. 2 is a diagram of the operational steps of a subsea fan sandiness risk assessment method based on continental rise classification according to another embodiment of the present invention;
FIG. 3 is a method of calculating the land frame slope fold accumulation speed, the land frame slope fold accumulation speed and the angle of the land frame slope fold migration trajectory;
FIG. 4 is a schematic representation of three shelf-compatible spatial conditions;
FIG. 5 is a schematic diagram of a case of rapidly evaluating sand-rich risk level of a fan at the northwest continental margin of the south China sea since the new generation in the evening.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The method for evaluating the sand-richness risk of the submarine fan based on the continental margin classification according to the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, there is provided a subsea fan sand-richness risk evaluation method based on a continental margin classification, and in a first embodiment of the subsea fan sand-richness risk evaluation method based on a continental margin classification, the method includes:
step S1, acquiring the geological age of a target submarine fan according to seismic data, and judging whether the climate forming background period of the target submarine fan is an ice-house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
step S2, identifying land frame slope break points of which the stratum seismic reflection changes from continuous reflection steepness to chaotic reflection and the slope changes from flat to steep, and sending the target seabed sector into a series of land frame slope break point connecting lines between an initial land frame slope break point and a last land frame slope break point corresponding to a development period to obtain a fan-shaped land frame slope break migration track of the target seabed;
and step S3, carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
It is understood that the amplitude, the oscillation frequency and the continuity of the seismic reflection in the embodiment can be obtained by processing the seismic data, specifically, by the color continuity and the color change of the seismic data. The geological age and the ice house climate period or the greenhouse climate period are in corresponding relation, the judgment of the ice house climate period or the greenhouse climate period is set as that the ice house climate period is the ice house climate period in the late cambrian period, the late clay pot period, the stone charcoal period, the pilferage period, the triassic period, the gradual generation period, the recent system and the quaternary period; the morning-midcambrian, aotao, shijiu, morning-midmarburg, Jurassic, Chalkbrook, ancient and primrose are warm climatic periods.
In the embodiment, the target submarine fans are divided into two categories, namely an ice-house climate period and a greenhouse climate period, under different climatic background forming conditions, land frame slope folding points of stratums in the target submarine fan are further accurately identified, a plurality of land frame slope folding points are sequentially connected to form a fan-shaped land frame slope folding migration track of the target submarine, the target submarine fans and land edges where the target submarine fans are located can be subjected to cause classification according to the fan-shaped land frame slope folding migration track of the target submarine, and then high-risk, medium-risk and low-risk evaluation is performed on sand-rich risks of different types of submarine fans through land edge cause type-submarine fan sand-rich risk level comparison charts. According to the method and the device, under the condition of only seismic data, the sand-rich risk grade of the submarine fan can be quickly evaluated through the land frame slope fold migration track and the climate forming background period, logging data are not needed to be used as constraint conditions, the method and the device are suitable for the no-well/few-well working condition conditions and are not limited by application scenes, the land frame slope fold migration track can be accurately identified through image processing, and the sand-rich risk evaluation of the submarine fan is more accurate.
As shown in fig. 2, further, according to the first embodiment of the subsea fan sand-richness risk evaluation method based on the continental margin classification provided by the present invention, a second embodiment of the subsea fan sand-richness risk evaluation method based on the continental margin classification is proposed, in the embodiment of the present invention, step S3 includes:
step S31, judging the fan-shaped sediment supply condition of the target seabed and the land frame accommodating space condition according to the land frame slope fold migration track;
and step S32, carrying out seabed fan sand-richness risk evaluation by combining the climate background period, the sediment supply condition and the land frame tolerable space condition.
In the embodiment, the target submarine fan-shaped sediment supply condition and the land frame capacity space condition are obtained according to the land frame slope fracture migration track, and the cause analysis of the target submarine fan is performed according to the target submarine fan-shaped sediment supply condition, the land frame capacity space condition and the climate background period, so that the accurate evaluation of the sand-rich risk of the submarine fan is completed.
According to the second embodiment of the submarine fan sand-richness risk assessment method based on the land edge classification provided by the invention, a third embodiment of the submarine fan sand-richness risk assessment method based on the land edge classification is provided, and in the embodiment of the invention, the step S31 comprises the following steps:
as shown in fig. 3, in step S311, a coordinate system of the migration trajectory of the land frame slope fold is established with the initial land frame slope fold point as the origin of coordinates, the X axis represents that the land frame slope fold moves along the horizontal direction, wherein the product entering the basin is positive, the product receding towards the land is negative, the Y axis represents that the land frame slope fold moves along the vertical direction, wherein the product adding upwards is positive, and the product adding downwards is negative;
step S312, judging the track type of the land frame slope fold migration track;
step S313, if the land frame slope fold migration track is an ascending track, calculating a land frame slope fold accumulation speed according to the following formula:
dy is the actual distance between the vertical projections of the initial land frame slope fold point and the final land frame slope fold on the Y axis and the land frame slope fold product distance, and T is the geological age of the migration track of the land frame slope fold; raThe land frame slope folding and accumulating speed is obtained;
and step S314, judging the sediment supply condition of the target seabed sector according to the slope accumulation speed of the land frame.
In the embodiment, after the climate background forming period is judged and obtained, the rising type land frame slope fold migration track and the formula are combined to carry out quantitative calculation on the land frame slope fold accumulation speed through different track types, so that accurate risk evaluation can be obtained in a targeted manner, and the accuracy of the risk evaluation can be improved.
According to the third embodiment of the submarine fan sand-richness risk assessment method based on the land edge classification provided by the invention, the fourth embodiment of the submarine fan sand-richness risk assessment method based on the land edge classification is provided, and in the embodiment of the invention, the step S31 comprises the following steps:
step S315, if the land frame slope fold migration track is a descending track, calculating the land frame slope fold accumulation speed according to the following formula:
dx is the horizontal projection of the initial stage slope break point and the final stage slope break point on the X axisActual distance between them, folding into the distance of land frame slope, RpThe folding and stacking speed of the land frame slope is adopted;
and step S316, judging the supply condition of the fan-shaped sediment of the target seabed according to the folding speed of the land frame slope.
In the embodiment, the land-frame slope folding and accumulating speed quantitative calculation is carried out on the descending land-frame slope folding and migrating trajectory according to the formula, so that corresponding data can be rapidly and quantitatively obtained, the accuracy of judging the supply condition of the target submarine sector sediment is ensured, and an accurate data judgment basis is provided for the submarine sector sand-rich risk evaluation.
In the embodiment of the present invention, the determination of the sediment supply condition of the target seafloor sector in step S314 is set as follows: ra>150m/My, the target subsea fan being a high Qs supplied for high velocity sediments;
Ra<150m/My, low Qs supplied by the target subsea fan for low speed sediment;
the determination of the sediment supply condition of the target seafloor sector in step S316 is set as follows: rp>10km/My, high Qs supplied by the target subsea fan for high speed sediment;
when R isp<10km/My, the target subsea fan supplies low Qs for low speed sediment. In the embodiment, corresponding judgment settings are set according to different track migration types, and the high-speed sediment supply conditions of the target submarine fan can be quickly acquired through the judgment settings only once.
In this embodiment of the present invention, step S31 further includes:
step S317, calculating the angle of the slope fold migration track of the land frame according to the following formula:
wherein, TseThe angle of the slope fold migration track of the land frame;
and step S318, judging the land frame accommodating space condition according to the angle of the land frame slope fold migration track.
In this embodiment, the land frame slope fold migration trajectory may be divided into a low-angle descending type, a low-angle ascending type, and a high-angle ascending type according to the angle of the land frame slope fold migration trajectory, and the trajectory type may be accurately determined based on the calculation of the accurate angle, so as to facilitate the determination of the subsequent land frame capacity space.
As shown in fig. 4, for three types of shelf-compatible space conditions, in the embodiment of the present invention, the determination in step S318 is set as:
-2°<Tse<1 degree, the target submarine fan is a descending type land frame accommodating space with a height delta a;
1°<Tse<4 degrees, wherein the target submarine fan is a middle delta a of the slow-rising type land frame accommodating space;
4°<Tse<130 deg., the target subsea fan is a low delta a of fast-rise shelf-compatible space.
In the embodiment, the land frame capacity space condition of the submarine fan is divided into three levels, and the sand-rich risk of the submarine fan can be accurately evaluated by matching with the two-level sediment supply condition.
In one embodiment, the subsea fan sandiness risk assessment in step S32 is set to:
the target seabed fan is high in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is high Qs and medium delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is low in Qs and high in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is low in Qs and medium in delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is low in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is high Qs and medium delta a, and is in a greenhouse climate period, so that the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in a greenhouse climate period, so that the sand-rich risk is low;
the target seabed fan is low in Qs and medium in delta a and is in a greenhouse climate period, so that the sand-rich risk is high;
the target subsea fan is low Qs, medium δ a and in the warm-room climate period, then the risk of sand-richness is low.
In the embodiment, the formed climate background period, the two-stage sediment supply condition and the three-stage shelf capacity space are combined specifically to cooperatively judge the sand-rich risk of the target submarine fan, and the smaller the sand-rich risk grade is, the higher the sand-rich possibility of the target submarine fan is represented, and the higher the oil-gas exploration value is; on the contrary, the larger the sand-rich risk grade is, the smaller the possibility of representing sand-rich of the target seabed fan is, and the smaller the oil and gas exploration value is.
In one embodiment, the evaluation of the level of risk of sand-richness of the bottom fan for the development of the north-west continental margin of the south sea since the new occurrence in the evening is performed in three stages, as shown in fig. 5. Firstly, acquiring an ice house climate period corresponding to the new late, and then judging the supply conditions of sediments at the northwest continental margin of the south sea based on the movement speed of the slope-fold migration trajectory of the land frame, wherein the geological ages corresponding to the bottom interfaces of the northwest continental margin of the south sea, the northwest continental margin of the south sea of the Shanxi Xinshi and the northwest continental margin of the south sea of the quarternary are respectively 10.5Ma, 5.5Ma and 1.9Ma (known); thus, they correspond to geological ages of "10.5 Ma-5.5Ma ═ 5.0My, 5.5 Ma-1.9 Ma ═ 3.6My, and 1.9Ma-0 ═ 1.9 My", respectively. Establishing a coordinate system of the bent migration track of the landframe by taking initial bent points of the landframe corresponding to the northwest continents of the late, the shangxian and the quarternary south sea as coordinate origin (0,0), and measuring to obtain: the folded distances of the land frame slopes are 40.92km, 39.01km and 11.47km respectively; the folding and stacking distances of the land frame slopes are-371 m, 578m and 968m respectively.
On the basis, the formula is used for calculating and obtaining, wherein the land edge of the northwest of the late New, New and the south China sea of the fourth era: the folding and stacking speeds of the land frame slope are-74.3 m/My, 160.5m/My and 509.4m/My respectively; the folding speed of the land frame slope is 8.18km/My, 10.84km/My and 6.03km/My respectively. Determining and setting by using sediment supply conditions (Qs), wherein late-middle-aged, new-aged and quaternary south-sea northwest continents are low Qs, high Qs and high Qs continents respectively, determining the spatial condition of the continental rise and northwest continental rise based on the movement type of the continental rise slope-fold migration trajectory, and calculating and acquiring by using a formula on the basis of the sum acquired by calculating: the track angles of the slope fold migration tracks of the northwest continental shelf of the late-school new-age, the shangxian and the quarternary south-sea are-0.52 degrees, 0.81 degrees and 4.82 degrees respectively.
On the basis, the land frame capacity space conditions (delta a) are used for judging and setting, so that the ' late-middle-new-age, late-new-age and quaternary north-south-sea continents ' are respectively low delta a, low delta a and high delta a continents ', and the ' late-middle-new-age, late-middle-new-age and quaternary south-sea north-north continent margin ' can be respectively divided into ' low Qs-low delta a-ice chamber continent, high Qs-low delta a-ice chamber continent and high Qs-high delta a-ice chamber continent ' according to ' climate background conditions (ice chamber and greenhouse), sediment supply conditions (high Qs and low Qs) and land frame capacity space conditions (high delta a, middle delta a and low delta a) ' under the premise that the three south-north-south-sea continent margin cause conditions are obtained. The results show that: the sand-rich risk level of the submarine fan corresponding to the northwest continental margin of the south sea of the late middle and the new Shang is 'low risk'; and the sand-rich risk grade of the submarine fan developing from the northwest continental margin of the south China sea of the quaternary is 'high risk'. In this embodiment of the present invention, step S1 specifically includes:
step S11, identifying seismic reflection wave groups similar to the seismic reflection amplitude, frequency and continuity of the target submarine fan on the seismic data;
and step S12, tracking and comparing the target submarine fan to the existing drilling area of the adjacent region according to the similarity comparison principle, and determining the geological age of the target submarine fan according to the age information corresponding to the drilled well.
In the embodiment, the geological age of the target submarine fan can be obtained through the similarity comparison principle and the seismic data, so that the data can be obtained simply and conveniently, a well drilling mode is not needed for obtaining, and the convenience of the evaluation method is improved.
The invention also provides a submarine fan sand-rich risk evaluation device based on land edge classification, which comprises:
the image processing module is used for acquiring the geological age of the target submarine fan according to seismic data and judging whether the target submarine fan is formed in an ice house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
the identification module is used for identifying land frame slope folding points of which the stratum seismic reflection is changed from continuous reflection steepness into disordered reflection and the slope is changed from flat to steep, and sending the target seabed sector into a series of land frame slope folding connecting lines between initial and final land frame slope folds corresponding to the development period so as to obtain a land frame slope folding migration track of the target seabed sector;
and the evaluation module is used for carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A submarine fan sand-rich risk assessment method based on land edge classification is characterized by comprising the following steps:
step S1, acquiring the geological age of a target submarine fan according to seismic data, and judging whether the climate forming background period of the target submarine fan is an ice-house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
step S2, identifying land frame slope break points of which the stratum seismic reflection changes from continuous reflection steepness to chaotic reflection and the slope changes from flat to steep, and sending the target seabed sector into a series of land frame slope break point connecting lines between an initial land frame slope break point and a last land frame slope break point corresponding to a development period to obtain a fan-shaped land frame slope break migration track of the target seabed;
and step S3, carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
2. The method for evaluating the sand-richness risk of the submarine fan according to claim 1, wherein step S3 includes:
step S31, judging the fan-shaped sediment supply condition of the target seabed and the land frame accommodating space condition according to the land frame slope fold migration track;
and step S32, carrying out seabed fan sand-richness risk evaluation by combining the climate background period, the sediment supply condition and the land frame tolerable space condition.
3. The method for evaluating the sand-richness risk of the submarine fan according to claim 2, wherein step S31 includes:
step S311, establishing a coordinate system of the slope fold migration track of the land frame by taking the initial land frame slope fold point as the coordinate origin, wherein the X axis represents that the land frame slope fold moves along the horizontal direction, the product entering the basin is positive, the product retreating towards the land is negative, the Y axis represents that the land frame slope fold moves along the vertical direction, the product adding upwards is positive, and the product adding downwards is negative;
step S312, judging the track type of the land frame slope fold migration track;
step S313, if the land frame slope fold migration track is an ascending track, calculating a land frame slope fold accumulation speed according to the following formula:
dy is the actual distance between the vertical projections of the initial land frame slope fold point and the final land frame slope fold on the Y axis and the land frame slope fold product distance, and T is the geological age of the migration track of the land frame slope fold; raThe land frame slope folding and accumulating speed is obtained;
and step S314, judging the sediment supply condition of the target seabed sector according to the slope accumulation speed of the land frame.
4. The method for evaluating the sand-richness risk of the submarine fan according to claim 3, wherein step S31 includes:
step S315, if the land frame slope fold migration track is a descending track, calculating the land frame slope fold accumulation speed according to the following formula:
dx is the actual distance between the horizontal projection of the initial land frame slope break point and the final land frame slope break point on the X axis, RpThe folding and stacking speed of the land frame slope is adopted;
and step S316, judging the supply condition of the fan-shaped sediment of the target seabed according to the folding speed of the land frame slope.
5. The method for evaluating the sand-richness risk of the submarine fan according to the continental margin classification as claimed in claim 4, wherein the determination of the sediment supply condition of the target submarine fan in step S314 is set as follows: ra>150m/My, the target subsea fan being a high Qs supplied for high velocity sediments;
Ra<150m/My, low Qs supplied by the target subsea fan for low speed sediment;
the determination of the sediment supply condition of the target seafloor sector in step S316 is set as follows: rp>10km/My, high Qs supplied by the target subsea fan for high speed sediment;
when R isp<10km/My, the target subsea fan supplies low Qs for low speed sediment.
6. The method for evaluating the sand-richness risk of the submarine fan according to claim 5, wherein step S31 further comprises:
step S317, calculating the angle of the slope fold migration track of the land frame according to the following formula:
wherein, TseThe angle of the slope fold migration track of the land frame;
and step S318, judging the land frame accommodating space condition according to the angle of the land frame slope fold migration track.
7. The method for evaluating the sand-richness risk of the submarine fan according to claim 6, wherein the judgment in step S318 is set as:
-2°<Tse<1 degree, the target submarine fan is a descending type land frame accommodating space with a height delta a;
1°<Tse<4 degrees, wherein the target submarine fan is a middle delta a of the slow-rising type land frame accommodating space;
4°<Tse<130 deg., the target subsea fan is a low delta a of fast-rise shelf-compatible space.
8. The method for evaluating the sand-richness risk of the submarine fan according to the continental margin classification as claimed in claim 7, wherein the sand-richness risk evaluation of the submarine fan in step S32 is set as follows:
the target seabed fan is high in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is high Qs and medium delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is low in Qs and high in delta a and is in an ice chamber climate period, so that the risk of sand enrichment is high;
the target seabed fan is low in Qs and medium in delta a and is in an ice chamber climate period, and the risk of medium sand richness exists;
the target seabed fan is low in Qs and delta a and is in an ice chamber climate period, so that the risk of sand enrichment is low;
the target seabed fan is high Qs and medium delta a, and is in a greenhouse climate period, so that the risk of medium sand richness exists;
the target seabed fan is high in Qs and low in delta a and is in a greenhouse climate period, so that the sand-rich risk is low;
the target seabed fan is low in Qs and medium in delta a and is in a greenhouse climate period, so that the sand-rich risk is high;
the target subsea fan is low Qs, medium δ a and in the warm-room climate period, then the risk of sand-richness is low.
9. The method for evaluating the sand-richness risk of the submarine fan according to any one of claims 1 to 8, wherein step S1 specifically comprises:
step S11, identifying seismic reflection wave groups similar to the seismic reflection amplitude, frequency and continuity of the target submarine fan on the seismic data;
and step S12, tracking and comparing the target submarine fan to the existing drilling area of the adjacent region according to the similarity comparison principle, and determining the geological age of the target submarine fan according to the age information corresponding to the drilled well.
10. A submarine fan sand-rich risk assessment device based on continental rise classification, characterized in that the device comprises:
the image processing module is used for acquiring the geological age of the target submarine fan according to seismic data and judging whether the target submarine fan is formed in an ice house climate period or a greenhouse climate period according to the geological age of the target submarine fan;
the identification module is used for identifying land frame slope folding points of which the stratum seismic reflection is changed from continuous reflection steepness into disordered reflection and the slope is changed from flat to steep, and sending the target seabed sector into a series of land frame slope folding connecting lines between initial and final land frame slope folds corresponding to the development period so as to obtain a land frame slope folding migration track of the target seabed sector;
and the evaluation module is used for carrying out seabed fan sand-rich risk evaluation by combining the climate background period and the land frame slope fracture migration trajectory.
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