CN105652341B - A kind of quick quantification palaeogeomorphology for considering paleostructure influence - Google Patents
A kind of quick quantification palaeogeomorphology for considering paleostructure influence Download PDFInfo
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- CN105652341B CN105652341B CN201511014406.6A CN201511014406A CN105652341B CN 105652341 B CN105652341 B CN 105652341B CN 201511014406 A CN201511014406 A CN 201511014406A CN 105652341 B CN105652341 B CN 105652341B
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Abstract
The invention provides a kind of quick quantification palaeogeomorphology for considering paleostructure influence, comprise the following steps：1）Reference plane is chosen；2）Formation thickness is calculated；3）Chosen with reference to well point；4）Reference level surface is determined；5）Calculate work area Nei Ge well points ancient landform height value；6）Paleogeographic reconstruction and industry mapping.The present invention handles complicated Geological Prediction question simplification, and do not lose its accuracy, reduce a large amount of element tasks of conventional method, saved manpower take, while having very strong transplantability, suitable for the paleogeographic reconstruction of all kinds of oil-gas reservoirs of China and the world, promotional value is very big.
Description
Technical field
The invention belongs to exploration of oil and gas field and development technique field, and in particular to a kind of the quick of consideration paleostructure influence is determined
Quantify palaeogeomorphology.
Background technology
For carbonate rock or clastic reservoir rock that ancient landform is controlled, the accurate ancient landform pair that recovers determines oily model
Enclose significant.The disclosed all kinds of palaeogeomorphologies delivered substantially have following several both at home and abroad at present：Such as the earth
Physical, paleogeology method, stratigraphic sequence method, residual thickness method, impression method, basin analysis are peeled back to method, computer simulation method.
Geophysical method advantage is vivid, true to nature, directly perceived, but is limited substantially by technical conditions, and data processing work amount is big,
Do not represent really original ancient landform, but the ancient landform remained now.Paleogeology method is a kind of ancient ground of qualitative analysis
Looks restoration methods, it is impossible to realize that quantification is characterized.The accurate analysis cycle structure type of SEQUENCE STRATIGRAPHIC restoring method requirement, belongs to qualitative point
Analysis, difficulty is big, uncertain high.Residual thickness is owned by France in sxemiquantitative restoring method, simple to operation, but does not consider later structural
Influence to deposition, error is larger.Impression method considers the influence of later structural, is a kind of semidefinite quantization method, to " stamp "
Stratum also needs to carry out decompaction correction.Basin analysis is peeled back to method and considers the relative settlement of basin's verge area and degrade, workload
Greatly, and the calculating of denudation, decompaction correction equal error are larger.Computer simulation method requires that data are more, and workload is big, it is artificial because
It is plain high, it is impossible to carry out formation compaction correction, be applicable the foundation of ancient landform pattern.
In summary, it is actually a complex process for paleogeographic reconstruction process, to technological means requirement
High, workload is big, although different researchers carry out paleogeographic reconstruction from distinct methods, but can only indirectly close to original ancient landform,
Restoration methods are in the qualitative developing stage to sxemiquantitative, it is difficult to which quantification predicts more real ancient landform form, to oil-gas reservoir
Exploration and development is only capable of accomplishing the guidance in geologic concept model, lacks three-dimensional " true " property, especially detailed description is held
It is not in place.Seen on surface, although certain methods have accomplished the quantitative description of paleogeographic reconstruction, but its essence is utilize other boundaries
Formation thickness between face, speculates that palaeogeomorphic height rises and falls using " image theory ", otherwise paleostructure can not be embodied to ancient landform
Influence, or can not intuitively embody ancient landform form.Some scholars, which attempt to combine using multi-method, solves above-mentioned problem, but past
Had reached an impasse toward several method localized region ancient landform explanation difference is faced, it has to carried out qualitatively using compromise algorithm
Processing, and which in turn reduces the quantitative evaluation precision of paleogeographic reconstruction.Comprehensive analysis current technology method is generally in half
Between the qualitative quantization to semidefinite, being reproduced from true ancient landform still has a segment distance.
In addition, certain methods need to be by means of instruments such as Seismic Reservoir Prediction, computer simulations, and not only cost is high, work
Work amount is big, time-consuming many, can not still solve to consider that paleostructure influence realizes quantification again during paleogeographic reconstruction simultaneously
The problem of evaluation.
The content of the invention
It is an object of the invention to provide a kind of accurate simple, quick and quantification palaeogeomorphology, realize
Paleogeographic reconstruction industrializes quick mapping, and technical support is provided for oilfield prospecting developing.
Therefore, the invention provides a kind of quick quantification palaeogeomorphology for considering paleostructure influence, including with
Lower step：
Step 1）Reference plane is chosen：According to ancient landform overlying and underlying strata Deposit contact relation, with sedimentary principle,
The overlying reference plane and underlying strata reference plane of the nearest ancient landform plane of unconformity of chosen distance are analyzed as ancient landform respectively
Reference plane；
Step 2）Formation thickness is calculated：Respectively calculate work area in drilled well ancient landform plane of unconformity to overlying reference plane,
The formation thickness for the reference plane that underlies, and decompaction correction is carried out to formation thickness；
Step 3）Chosen with reference to well point：To the ancient landform plane of unconformity of drilled well in work area to overlying reference plane, underlie base
The formation thickness in quasi- face is ranked up contrast, and it is all the well of maximum gauge in work area as referring to well to select the two formation thicknesses
Point, if in the absence of above-mentioned well point, selection above-mentioned two formation thickness sum is the well point of maximum in work area as referring to well point；
Step 4）Reference level surface is determined：It regard the reference plane bottom surface horizontal plane that underlies of above-mentioned reference well point as reference levels
Face；
Step 5）Calculate work area Nei Ge well points ancient landform height value；
Step 6）Paleogeographic reconstruction and industry mapping：Elevation map is worked out using the ancient landform height value of work area Nei Ge well points,
Obtain paleogeographic reconstruction figure.
The step 2）Middle ancient landform plane of unconformity to overlying reference plane, the reference plane that underlies formation thickness no more than 80m
When, then formation thickness is without decompaction correction.
The step 5）Middle work area Nei Ge well points ancient landform height value is calculated：With reference to well point ancient landform plane of unconformity under
The formation thickness for lying prostrate reference plane is the ancient landform height value of the well；
The ancient landform height value of other each well points is the ancient landform plane of unconformity of reference well point to overlying reference plane and underlied
The formation thickness sum of reference plane subtracts the formation thickness for calculating the ancient landform plane of unconformity of well point to overlying reference plane.
The beneficial effects of the invention are as follows：The present invention merely with drilled well drilling well, well-log information, based on ancient landform overlying and under
Portion's sedimentation contact relation, is analyzed by geologic concept model, establishes a kind of simple, quick, quantification ancient landform extensive
Compound method, complicated Geological Prediction question simplification is handled, and does not lose its accuracy, reduces a large amount of bases of conventional method
Plinth work, saved manpower take, while having very strong transplantability, it is adaptable to the ancient landform of all kinds of oil-gas reservoirs of China and the world
Recover, promotional value is very big.
The present invention has been successfully applied to gas field Lower Paleozoic strata carbonate karst paleogeographic reconstruction work of pacifying the border region, based on the party
Method has refined geomorphic units at different levels, divided karst Favorable Areas, and powerful support gas field development maps out the work.
It is described in further details below in conjunction with accompanying drawing.
Brief description of the drawings
Fig. 1 is paleogeographic reconstruction flow chart of steps of the present invention；
Fig. 2 is that ancient landform relative elevation value of the present invention calculates schematic diagram.
Embodiment
Embodiment 1：
Present embodiments provide a kind of quick quantification paleogeographic reconstruction side of consideration paleostructure influence as shown in Figure 1
Method, comprises the following steps：
Step 1）Reference plane is chosen：According to ancient landform overlying and underlying strata Deposit contact relation, with sedimentary principle,
The overlying reference plane and underlying strata reference plane of the nearest ancient landform plane of unconformity of chosen distance are analyzed as ancient landform respectively
Reference plane；
Step 2）Formation thickness is calculated：Respectively calculate work area in drilled well ancient landform plane of unconformity to overlying reference plane,
The formation thickness for the reference plane that underlies, and decompaction correction is carried out to formation thickness；
Step 3）Chosen with reference to well point：To the ancient landform plane of unconformity of drilled well in work area to overlying reference plane, underlie base
The formation thickness in quasi- face is ranked up contrast, and it is all the well of maximum gauge in work area as referring to well to select the two formation thicknesses
Point, if in the absence of above-mentioned well point, selection above-mentioned two formation thickness sum is the well point of maximum in work area as referring to well point；
Step 4）Reference level surface is determined：It regard the reference plane bottom surface horizontal plane that underlies of above-mentioned reference well point as reference levels
Face；
Step 5）Calculate work area Nei Ge well points ancient landform height value；
Step 6）Paleogeographic reconstruction and industry mapping：Elevation map is worked out using the ancient landform height value of work area Nei Ge well points,
Obtain paleogeographic reconstruction figure.
Embodiment 2：
On the basis of embodiment 1, step 2）Middle ancient landform plane of unconformity is to the stratum of overlying reference plane, the reference plane that underlies
When thickness is not more than 80m, then formation thickness is without decompaction correction.
Step 5）Middle work area Nei Ge well points ancient landform height value is calculated：With reference to well point ancient landform plane of unconformity to the base that underlies
The formation thickness in quasi- face is the ancient landform height value of the well；
The ancient landform height value of other each well points is the ancient landform plane of unconformity of reference well point to overlying reference plane and underlied
The formation thickness sum of reference plane subtracts the formation thickness for calculating the ancient landform plane of unconformity of well point to overlying reference plane.
As shown in Fig. 2 ancient landform relative elevation value is calculated：
Using the bottom surface horizontal plane of P well underlying strata reference planes as work area reference level surface, P well ancient landforms height value is HP
（Its value is equal to the benchmark face thickness that underlies with P well ancient landform planes of unconformity）, then any A wells ancient landform relative elevation value in work area
For HA：
HA=HOA+hA=HOA+（（HCP+HOP）-（HCA+HOA））=HCP+HOP-HCA
HA：A well ancient landform relative elevation values；
hA：A well ancient landform elevation offsets；
HOA：A well ancient landform planes of unconformity are to the benchmark face thickness that underlies；
HCA：A well ancient landform planes of unconformity are to overlying reference plane thickness；
HOP：P well ancient landform planes of unconformity are to the benchmark face thickness that underlies；
HCP：P well ancient landform planes of unconformity are to overlying reference plane thickness.
Embodiment 3：
The present embodiment is by taking certain large-scale carbonate rock gas reservoir as an example, the km of gas-bearing area 1009762, drilled well in area
1185 mouthfuls, conventional method is only capable of Semi-qualitative to the rough form of recovery Palaeokarst Landform of sxemiquantitative, and workload is huge, time-consuming
Many, common engineering, which is an apprentice of project verification to completion, needs more than 1 year time；Quantitative evaluation ancient landform form can be realized using this method,
Accuracy is higher, and workload is small, and common engineering Shi Yueyu just can complete work, and later maintenance work is simple, and inheritance is strong.
2014, in the gas field, the application present invention recovered whole district's ancient karst landform shape and refinement geomorphic unit, with reference to day
Right gas enrichment discipline, preferably 10 pieces of gas field periphery Favorable Areas, gas-bearing area 1400km2.Current 67 mouthfuls of drilled well, effective reservoir is bored
Encountering rate reaches more than 90%, complete 42 mouthfuls of well testing, and industrial gas well reaches 88%, average open-flow capacity 27.8 × 104m3。
The present invention can choose any mouthful of well in work area as referring to well point, and the reference plane that underlied in actual applications
Bottom surface calculates the ancient landform height value in the whole district as reference level surface.Results of calculation only influences the ancient landform of each well point
Height value size, but the overall general layout of ancient landform is not influenceed.
Method or specific implementation process that the present embodiment is not described in detail belong to the common knowledge of the industry, here not one by one
Narration.
It is exemplified as above be only to the present invention for example, do not constitute the limitation to protection scope of the present invention, it is all
It is to be belonged to the same or analogous design of the present invention within protection scope of the present invention.
Claims (2)
1. a kind of quick quantification palaeogeomorphology for considering paleostructure influence, it is characterised in that comprise the following steps：
Step 1）Reference plane is chosen：According to ancient landform overlying and underlying strata Deposit contact relation, with sedimentary principle, difference
The benchmark that the overlying reference plane and underlying strata reference plane of the nearest ancient landform plane of unconformity of chosen distance are analyzed as ancient landform
Face；
Step 2）Formation thickness is calculated：Respectively calculate work area in drilled well ancient landform plane of unconformity to overlying reference plane, underlie
The formation thickness of stratigraphic datum, and decompaction correction is carried out to formation thickness；
Step 3）Chosen with reference to well point：To the ancient landform plane of unconformity of drilled well in work area to overlying reference plane, underlying strata base
The formation thickness in quasi- face is ranked up contrast, and it is all the well point of maximum gauge in work area as reference to select the two formation thicknesses
Well point, if in the absence of above-mentioned well point, selection above-mentioned two formation thickness sum is the well point of maximum in work area as referring to well
Point；
Step 4）Reference level surface is determined：It regard the underlying strata reference plane bottom surface horizontal plane of the reference well point as reference levels
Face；
Step 5）Calculate work area Nei Ge well points ancient landform height value：With reference to well point ancient landform plane of unconformity to underlying strata benchmark
The formation thickness in face is the ancient landform height value of the well；
The ancient landform height value of other each well points is the ancient landform plane of unconformity with reference to well point to overlying reference plane and underlying strata
The formation thickness sum of reference plane subtracts the formation thickness for calculating the ancient landform plane of unconformity of well point to overlying reference plane；
Step 6）Paleogeographic reconstruction and industry mapping：Elevation map is worked out using the ancient landform height value of work area Nei Ge well points, is obtained
Paleogeographic reconstruction figure.
2. a kind of quick quantification palaeogeomorphology for considering paleostructure influence according to claim 1, its feature
It is：Step 2）When middle ancient landform plane of unconformity to the formation thickness of overlying reference plane, underlying strata reference plane is not more than 80m,
Then formation thickness is without decompaction correction.
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| CN108734779B (en) * | 2017-04-17 | 2021-07-30 | 中国石油化工股份有限公司 | Ancient landform restoration method |
| CN107065009B (en) * | 2017-04-18 | 2018-12-11 | 中国石油大学(华东) | A kind of buried hill oil gas field underground geological map preparation method based on seismic data |
| CN107167853A (en) * | 2017-06-01 | 2017-09-15 | 陕西延长石油(集团)有限责任公司研究院 | A kind of fine method for recovering Palaeokarst Landform |
| CN109143361B (en) * | 2018-10-10 | 2019-12-24 | 西南石油大学 | Method for compiling carbonate rock stratum paleogeology map based on sequence stratigraphy |
| CN111077588B (en) * | 2019-12-30 | 2022-06-03 | 中国石油天然气股份有限公司 | Method for evaluating quality of karst carbonate reservoir by using residual stratum thickness |
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