CN105388530A - Streamline method based oil-gas migration simulation method - Google Patents
Streamline method based oil-gas migration simulation method Download PDFInfo
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- CN105388530A CN105388530A CN201510878267.5A CN201510878267A CN105388530A CN 105388530 A CN105388530 A CN 105388530A CN 201510878267 A CN201510878267 A CN 201510878267A CN 105388530 A CN105388530 A CN 105388530A
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Abstract
The invention discloses a streamline method based oil-gas migration simulation method. According to the method, a geological structural map used as the basis is divided into many regular rectangular grids, certain point in a grid, with distribution of hydrocarbon source rocks, in the structural map serves as an initial position, and a random number, rather than the center or a node, of the grid is given to determine the initial position; an upward inclination normal direction of the initial position is determined, the oil-gas migration locus is stated being tracked, and oil-gas migrates from low to high; and in the migration process, the upward inclination normal direction of the position is determined at any time, and the whole tracking process is completed by carrying the oil-gas from the hydrocarbon source rock distribution area in a lower position to the trap area in the higher position. According to the invention, the effective simulation method is used, the simulation result is high in accuracy and accords with the practicality, traps with oil gas can be accurately found, and the efficiency of oil-gas exploration is greatly improved.
Description
Technical field
The present invention relates to a kind of oil-gas migration analogy method, specifically, relate to a kind of streamline method oil-gas migration analogy method, belong to oil-gas exploration technical field.
Background technology
Oil-gas migration simulation is the important ring of oil-gas exploration, to instructing oil-gas exploration, there is important directive significance, it can according to existing exploration results, pass through numerical simulation, the direction inferring oil-gas migration intuitively and the position that may assemble, thus reach the object of quick oil prospecting, minimizing exploration risk, reduction prospecting prime cost are had great importance.Transported simulation is the oil gas that hydrocarbon source rock under base area generates, and according to the quantity of the oil gas of discharging, from hydrocarbon source rock through carrier bed, arrives the simulation process of trap.Trap is the place that oil gas finally stores in underground.Underground trap is a lot, but oil and gas bearing trap is few, and it is not easily found, and oil-gas exploration process is exactly find the process of oil and gas bearing trap.
The spatial dimension of general distribution of source rock is known, and is in the depressed area in basin, and position is low, the degree of depth is large, can be obtained by exploration; Trap is in position higher or more shallow in basin, belongs to the upwelling area in basin, and also find by exploration, but in numerous trap, which contains oil gas is unknown, digs a well in several trap, but without the situation of oil and gas discovery often continuously.Roughly, land is several necessarily to 100,000,000 to cost per well drilled, and sea is 1-5 hundred million, when beating a bite well and without oil gas, then explores failure.Can therefore, by the characteristics of motion of oil gas itself, study which trap contain the possibility of oil gas comparatively greatly by method for numerical simulation, which can not oil-containing, has important directive significance by oil-gas exploration.Oil gas has certain distance from hydrocarbon source rock to trap, and is subject to the impact of many factors, by effective Mathematical Modelling Method, just can find the trap of oily exactly, the efficiency of oil-gas exploration will be improved widely, the trap of oily can be found fast and accurately, reduce prospecting prime cost.
Therefore effective method will produce huge economic benefit.
Summary of the invention
The technical issues that need to address of the present invention are just to provide a kind of streamline method oil-gas migration analogy method, it is by effective Mathematical Modelling Method, and the correctness of analog result is high, realistic, trap can be found more exactly, greatly increase the efficiency of oil-gas exploration.
The technical scheme that the present invention solve the technical problem is:
Based on one deck geologic structure diagram, structural map is divided into a lot of regular oblong grid, in the grid that structural map has a distribution of source rock, certain point is as starting point S, as initial position, initial position S's is given, neither net center of a lattice, neither the node of certain grid, but given random number determines initial position in grid; Each some needs 2 random numbers, determine X-direction and the Y-direction position in grid respectively with this; Oil-gas migration track is followed the trail of afterwards with the updip normal direction of initial position on structural map, oil gas is migrated from low to high, in the process of migration, judge the updip normal direction of oil gas point position at any time, carry the entrapment areas that the oil gas distribution of source rock district lower from position is higher to position.
Follow the trail of oil gas not only side direction walking migration in oil-gas migration track process, upwards lie prostrate the migration of carrier bed seepage simultaneously, need to judge to throw oneself on the ground the lithology of layer, according to the sand factor of layer of throwing oneself on the ground on being, sand factor is the number percent of the total thickness of sandstone thickness and this stratum in certain cover stratum, the degree of upwards seepage is determined according to sand factor, if on the many sand of layer mud of throwing oneself on the ground few, sand factor <20%, then completely closed, oil gas upwards cannot be migrated and be thrown oneself on the ground in layer on it, and oil gas can only lateral migration; If on to throw oneself on the ground a layer sand factor >80%, be namely sandstone substantially, hole is comparatively large, then oil gas directly can leak into and throw oneself on the ground in layer; On throw oneself on the ground layer sand factor between 21%-79% time, then have part hydrocarbon seepage on to throw oneself on the ground layer, remaining part oil gas is then along stratum updip direction lateral migration.
Have tomography place in growth, determine the direction of oil-gas migration according to the opening feature parameter of tomography, tomography between active stage, full open, oil gas along tomography continue upwards migrate; In the quiescent period, then tomography is completely closed, i.e. opening degree <10%, then can migrate to updip direction along stratum side direction.
The present invention is by effective Mathematical Modelling Method, and the correctness of analog result is high, realistic, can find trap more exactly, greatly increases the efficiency of oil-gas exploration.
Accompanying drawing explanation
Fig. 1 be the present invention on structural map, oil-gas migration track to be migrated schematic diagram from low to high along updip direction.
Fig. 2 be the present invention on structural map, oil-gas migration track along tomography migration distribute schematic diagram.
Fig. 3 is Tarim Basin In Xinjiang southwest Cambrian system top circle's paleostructural map and Main Petroleum Migration Pathways planimetric map.
Fig. 4 is North Tarim Basin, Xinjiang Arkekule protruding Cambrian system sea oil migration in western mid-term strength plane figure.
Fig. 5 is the tracking mode schematic diagram of oil gas lateral migration.
Embodiment
The inventive method is based on one deck geologic structure diagram, ordinary construction figure can be divided into a lot of grid, structural map is followed the trail of from distribution of source rock region, some points are set at certain Rectangular grid of this region, as starting point, updip direction (normal direction) to structure is followed the trail of from low to high by a fixed step size, i.e. oil-gas migration, as shown in Fig. 1 or Fig. 5, in Fig. 1, 1 is structure contour, 2 is displacement passage, 3 is irreducible oil, 4 is tendency, 5 for catching oil, 6 is phase transformation, in the process of migration, need the updip direction (i.e. normal) of judging point position at any time, carry oil gas from hydrocarbon source rock to trap.Its core is the given of starting point, neither with unit center of a lattice, neither certain node, but given random number determines initial position in cell, and oil-gas migration track followed the trail of afterwards is by natural beauty, and realistic.As t1 in Fig. 5 for follow the trail of from starting point S the first step the point that obtains, it and starting point S are in same grid; A given step-length continues to follow the trail of again, and arrive the point that t2 follows the trail of for second step, still in same grid, this normal of 3 is different; Continue the point tracking the 3rd step, obtain t3, at this moment this point then spans a grid; Continue tracking and can arrive t4, t4 and t3 is in same grid, the rest may be inferred, multiple like this point just forms continuous and smooth lines, the track of oil-gas migration is represented with it, these lines meet the minimum potential energy principal that oil-gas migration is followed, and can intactly can more reasonably follow the trail of out from hydrocarbon source region to trap by oil-gas migration track accordingly.
In tracing process, oil gas not only can side direction concordant walking (migration), a layer seepage of also may upwards throwing oneself on the ground, and the sand cut of the layer that needs to throw oneself on the ground on judging (certain overlaps the number percent of the total thickness of sandstone thickness and this stratum in stratum), determines the degree of upwards seepage.If on layer sand factor of throwing oneself on the ground be <20%, be namely mud stone substantially, mud stone has certain sealing role to oil gas, then completely closed, oil gas can not be gone up to migration, can only side direction migrate along stratum updip direction; If sand cut >80%, be equivalent to the many mud of sand few, sandstone has more macroporous rock, do not have sealing role to oil gas, then oil gas directly can leak into the stratum of volt containing sandstone; Time between 21%-79%, then can part hydrocarbon seepage on to throw oneself on the ground layer, remaining part oil gas along stratum lateral migration, in table 1.
Table 1 oil is gentle upwards lies prostrate rock stratum seepage ratio
| Sand cut | The migration ratio of oil | The migration ratio of gas |
| 10-20% | 0.0 | 0.1 |
| 21-30% | 0.1 | 0.2 |
| 31-40% | 0.3 | 0.4 |
| 41-50% | 0.4 | 0.5 |
| 51-60% | 0.5 | 0.7 |
| 61-80% | 0.8 | 1.0 |
| 81-100% | 1.0 | 1.0 |
There is tomography place in growth, migration quantity can be determined according to the openability parameter of tomography.During faulting, tomography is full open, i.e. opening degree >90%, oil gas substantially 100% suitable tomography upwards migrate to the layer position having tomography; Tomography is in the quiescent period, then completely closed, and namely opening degree is <10%, then oil gas can side direction upwards be migrated along dip direction; If be in semi-open state, between 10-90%, then distribute by a certain percentage, as shown in Figure 2.
Within 2005, by the method, the simulation of oil-gas migration streamline method is carried out to the Bachu uplift of Southwest Tarim, predict that beautiful Bei1Jing is the main channel of oil-gas migration, after beaten a bite barreler in 2009 at Yu Bei1Jing Chu, confirm the correctness of analog result above, thus open the new page of Bachu uplift oil-gas exploration.As shown in Figure 3.
Within 2007, carried out the simulation of oil-gas migration streamline method to North Tarim Basin, Xinjiang Arkekule projection, simulation employs this method, and as can be seen from Cambrian strata sea oil migration in western mid-term strength plane figure Fig. 4, western part, study area has good gathering.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (3)
1. a streamline method oil-gas migration analogy method, it is characterized in that: described method is based on one deck geologic structure diagram, structural map is divided into a lot of regular oblong grid, in the grid cell that structural map has a distribution of source rock, certain point is as starting point S, as initial position, initial position S's is given, neither net center of a lattice, neither node on certain grid, but given random number determines initial position in grid; Each some needs 2 random numbers, determine X-direction and the Y-direction relative position in grid respectively with this; Follow the trail of oil-gas migration track with the updip normal direction of initial position on structural map by a fixed step size afterwards, oil gas is migrated from low to high; In migration process, judge the updip normal direction of oil gas point position at any time, carry the entrapment areas that the oil gas distribution of source rock district lower from position is higher to position.
2. streamline method oil-gas migration analogy method as claimed in claim 1, it is characterized in that: follow the trail of oil gas not only side direction concordant walking migration in oil-gas migration track process, layer seepage of simultaneously upwards throwing oneself on the ground is migrated, need to judge to throw oneself on the ground the lithology of layer, according to the sand factor of layer of throwing oneself on the ground on being, sand factor is the number percent of the total thickness of sandstone thickness and this stratum in certain cover stratum, according to sandy ground than the degree determining upwards seepage, if on the many sand of layer mud of throwing oneself on the ground few, sand factor <20%, then completely closed, oil gas upwards cannot be migrated and be thrown oneself on the ground in layer on it, oil gas can only side direction concordant be migrated, if on to throw oneself on the ground a layer sand factor >80%, be namely sandstone substantially, hole is comparatively large, then oil gas all can leak into and throw oneself on the ground in layer, if on throw oneself on the ground layer sand factor between 21%-79% time, then have part hydrocarbon seepage on to throw oneself on the ground layer, remaining part oil gas is then along stratum updip direction lateral migration.
3. streamline method oil-gas migration analogy method as claimed in claim 2, is characterized in that there is tomography place in growth, determines the direction of oil-gas migration according to the opening feature parameter of tomography, tomography between active stage, full open, oil gas continues upwards to migrate along tomography; In the quiescent period, then tomography is completely closed, i.e. opening degree <10%, then can migrate to updip direction along stratum side direction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109283578A (en) * | 2018-01-22 | 2019-01-29 | 中国石油天然气股份有限公司 | Method and device for determining the position of a hydrocarbon supply window of a submerged hill |
| CN114185083A (en) * | 2021-12-07 | 2022-03-15 | 成都理工大学 | Quantitative evaluation method for fault sealing in clastic rock stratum |
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| CN103945395A (en) * | 2014-02-27 | 2014-07-23 | 北京理工大学 | Particle-swarm-based rapid optimization deployment method for wireless network sensors |
| CN104881586A (en) * | 2015-06-12 | 2015-09-02 | 王涛 | Numerical simulation method and device for oil-gas migration in tight reservoir |
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| RU2112924C1 (en) * | 1997-03-25 | 1998-06-10 | Шеля Айзикович Губерман | Method of prediction of large fields of oil and gas |
| CN101915088A (en) * | 2010-06-25 | 2010-12-15 | 中国石油天然气股份有限公司 | Oil-gas migration path generation method and device |
| CN103945395A (en) * | 2014-02-27 | 2014-07-23 | 北京理工大学 | Particle-swarm-based rapid optimization deployment method for wireless network sensors |
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Cited By (3)
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| CN109283578A (en) * | 2018-01-22 | 2019-01-29 | 中国石油天然气股份有限公司 | Method and device for determining the position of a hydrocarbon supply window of a submerged hill |
| CN109283578B (en) * | 2018-01-22 | 2020-07-10 | 中国石油天然气股份有限公司 | Method and device for determining the position of a hydrocarbon supply window of a submerged hill |
| CN114185083A (en) * | 2021-12-07 | 2022-03-15 | 成都理工大学 | Quantitative evaluation method for fault sealing in clastic rock stratum |
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