CN105158803A - Method for selecting advantaged reservoir stratum - Google Patents
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Abstract
The embodiment of the invention discloses a method for selecting an advantaged reservoir stratum. The method comprises the following steps: obtaining a sound wave time difference curve, a depth lateral resistivity curve and a shallow lateral resistivity curve of a sample well in a work area; according to the sound wave time difference curve, the depth lateral resistivity curve and the shallow lateral resistivity curve, generating a physical property curve; according to the physical property curve, determining a physical property parameter value domain; obtaining earthquake data of the work area, and carrying out geological statistical inversion on the earthquake data to obtain a physical property parameter data body; and according to the physical property parameter value domain and the physical property parameter data body, selecting the advantaged reservoir stratum. According to the embodiment of the invention, the method for selecting the advantaged reservoir stratum can improve the accuracy of selecting the advantaged reservoir stratum in reservoir stratums.
Description
Technical field
The application relates to oil exploration technology field, particularly a kind of method choosing advantage reservoir.
Background technology
The physical parameter of reservoir generally comprises the parameters such as porosity and permeability.When the physical parameter of reservoir is higher, general this reservoir of title is advantage reservoir.The production capacity storing the quantity of oil gas and oil gas in advantage reservoir is usually all higher.Therefore, in the process of oil-gas exploration and exploitation, usually need to choose to choose advantage reservoir from the reservoir in work area.
In prior art, the method choosing advantage reservoir is usually as follows:
Obtain the interval transit time curve of a certain drilling well in the seismic data in work area and this work area; By described interval transit time curve, wave impedance inversion is carried out to described seismic data, to generate the wave impedance inversion data volume in work area; Predicted by the physical parameter of described Wave Impedance Data Volume to reservoir, and therefrom choose advantage reservoir.
Realizing in the application's process, inventor finds that in prior art, at least there are the following problems:
Interval transit time curve generally can only reflect the factor of porosity parameter of reservoir, can not reflect the physical parameter of reservoir all sidedly, such as Permeability Parameters etc.Be limited to the resolution of seismic data volume, the precision of prediction of interval transit time curve to reservoir is lower simultaneously.Therefore the accuracy rate chosen of above-mentioned method advantage reservoir of the prior art is not high, and advantage reservoir that can not be good to physical property in reservoir is well predicted.
Summary of the invention
The object of the embodiment of the present application is to provide a kind of method choosing advantage reservoir, to improve the accuracy rate that in reservoir, advantage reservoir is chosen.
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of method choosing advantage reservoir to be achieved in that
Choose a method for advantage reservoir, comprising:
Obtain the interval transit time curve of sample well in work area, deep lateral resistivity curve and shallow side direction resistivity curve;
Based on described interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, pass through formula
product linearity curve, wherein, Ac is the interval transit time value of interval transit time curve, Rlld is the deep lateral resistivity value of deep lateral resistivity curve, Rlls is the shallow side direction resistivity value of shallow side direction resistivity curve, the maximal value that max (Ac) is interval transit time in interval transit time curve, the minimum value that min (Ac) is interval transit time in interval transit time curve, n is the profile amplitude index of interval transit time curve;
According to described physical property curve, determine physical parameter codomain;
Obtain the geological data in described work area, geostatistical inversion is carried out to described geological data, obtain physical parameter data volume;
Advantage reservoir is chosen according to described physical parameter codomain and described physical parameter data volume.
The technical scheme provided from above the embodiment of the present application, the embodiment of the present application chooses the method for advantage reservoir, physical property curve is reconstructed based on interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, then based on physical property curve and the geostatistical inversion of reconstruct, the reservoir in work area is chosen.Compared with prior art, because described physical property curve can reflect the physical parameters such as the porosity and permeability of reservoir all sidedly, therefore the method for advantage of the choosing reservoir of the embodiment of the present application, can improve the accuracy rate that in reservoir, advantage reservoir is chosen, advantage reservoir that can be good to physical property in reservoir is well predicted.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram that the embodiment of the present application chooses advantage reservoir method;
Fig. 2 is the embodiment of the present application physical property tracing analysis figure;
Fig. 3 is the figure that crosses of the embodiment of the present application physical property curve and deep lateral resistivity curve;
Fig. 4 is the planar distribution figure that the application implements reservoir;
Fig. 5 is the Profile Correlation figure that the application implements physical property curve geostatistical inversion and conventional wave impedance inversion.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
A kind of method choosing advantage reservoir that the embodiment of the present application provides, as shown in Figure 1, comprising:
S101: obtain the interval transit time curve of sample well in work area, deep lateral resistivity curve and shallow side direction resistivity curve.
Described work area is generally the position of carrying out seismic prospecting.The quantity of described sample well can be 1, also can be multiple.
In a manner well described sample well is carried out to the acquisition process of log data, thus obtain log data.Such as can carry out acoustic logging, resistivity logging etc. to sample well.Then analyzing and processing is carried out to described log data, the interval transit time curve of described sample well, deep lateral resistivity curve and shallow side direction resistivity curve can be obtained.Wherein, what interval transit time curve generally reflected is the degree of depth of sample well and the corresponding relation of interval transit time value, what deep lateral resistivity curve generally reflected is the degree of depth of sample well and the corresponding relation of deep lateral resistivity value, and what shallow side direction resistivity curve generally reflected is the degree of depth of sample well and the corresponding relation of shallow side direction resistivity value.
S102: based on described interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, pass through formula
Product linearity curve.
In step S102, Ac is the interval transit time value of interval transit time curve, Rlld is the deep lateral resistivity value of deep lateral resistivity curve, Rlls is the shallow side direction resistivity value of shallow side direction resistivity curve, the maximal value that max (Ac) is interval transit time in interval transit time curve, the minimum value that min (Ac) is interval transit time in interval transit time curve, n is the profile amplitude index of interval transit time curve.
Usually, interval transit time curve may be used for the factor of porosity parameter reflecting reservoir, and deep lateral resistivity curve and shallow side direction resistivity curve may be used for the permeability parameter reflecting reservoir.Therefore, according to the physical property curve that interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve generate, factor of porosity parameter and the permeability parameter of reservoir can be reflected simultaneously.
Particularly, can by following mode product linearity curve:
First maximal value and the minimum value of interval transit time in the profile amplitude index of interval transit time curve and described interval transit time curve is obtained.Wherein, described profile amplitude index can be determined flexibly according to the actual conditions of reservoir in work area, its value size mainly by the impact of the factors such as lithology, zone thickness and fluid properties in work area, generally between 0-5.For the reservoir of coarse size, good penetrability, profile amplitude index can value larger, such as 4.For the reservoir that fine size, perviousness are bad, profile amplitude index can value less, such as 2.Usually, for the sample well in same work area, the size of profile amplitude index is identical.
Then obtain the degree of depth of sample well, determine the data point of this sample well according to the described degree of depth.Such as, when the degree of depth of sample well is 1000m, can be that data point is determined at interval with 1m, thus generate 1000 data points.For each data point, the interval transit time value of this data point is obtained according to interval transit time curve, according to the deep lateral resistivity value of this data point of deep lateral resistivity curve acquisition, obtain the shallow side direction resistivity value of this data point according to shallow side direction resistivity curve, then pass through formula
calculate the physical parameter value of this data point, wherein, Ac is the interval transit time value of data point, Rlld is the deep lateral resistivity value of data point, Rlls is the shallow side direction resistivity value of data point, the maximal value that max (Ac) is interval transit time curve, the minimum value that min (Ac) is interval transit time curve, n is the breadth index of interval transit time curve.The first half of this formula can reflect the factor of porosity parameter of reservoir, and latter half can reflect the Permeability Parameters of reservoir.Physical parameter can be regarded as the product of factor of porosity parameter and Permeability Parameters.Therefore, when factor of porosity and permeability are all high level, reservoir properties is the most superior.
Finally according to the physical parameter value of each data point of sample well, product linearity curve.Such as, according to the physical parameter value of each data point of sample well, can the method product linearity curve of use curve matching.
As shown in Figure 2, be the physical property tracing analysis figure in a certain depth range of sample well.Wherein, the ordinate in left side is the depth range of sample well, and middle curve is respectively the interval transit time curve of sample well and the difference curve of Rlld and Rlls, and right side is the physical property curve of the difference curve generation according to interval transit time curve and Rlld and Rlls.In Fig. 2, lithology is the rock property of sample well at different depth, and the part between two dotted lines represents the region that physical parameter value is higher.
S103: according to the physical property curve of described sample well, determine physical parameter codomain.
Particularly, physical property curve can reflect the physical parameter of reservoir.Deep lateral resistivity curve can reflect the permeability parameter of reservoir.Permeability parameter is general relevant with the oil-gas possibility of reservoir.Therefore, cross analysis can be carried out to the physical property curve of sample well and deep lateral resistivity curve, thus obtain the codomain of physical parameter.
Further, carrying out in the process of cross analysis to the physical property curve of sample well and deep lateral resistivity curve, physical parameter value and all higher reservoir of deep lateral resistivity value can be chosen as target reservoir, using the physical parameter span of target reservoir as physical parameter codomain.Such as, carrying out in the process of cross analysis to the physical property curve of sample well and deep lateral resistivity curve, physical parameter value is being greater than first threshold and deep lateral resistivity value is greater than the reservoir of Second Threshold as target reservoir.The size of described first threshold comprehensively can be determined according to the physical parameter value of each reservoir in sample well physical property curve, and the size of described Second Threshold comprehensively can be determined according to the deep lateral resistivity value of each reservoir in sample well deep lateral resistivity curve.
In some embodiments, carrying out in the process of cross analysis to the physical property curve of sample well and deep lateral resistivity curve, target reservoir can be chosen in conjunction with the actual oily situation of sample well, to increase the accuracy of the physical parameter codomain determined.
In some embodiments, the quantity of sample well can be multiple.So, cross analysis can be carried out to the physical property curve of each sample well and deep lateral resistivity curve, to choose the target reservoir of each sample well.Finally the physical parameter span of the target reservoir of each sample well is comprehensively analyzed, to determine physical parameter codomain.Such as, can using the common factor of the target reservoir physical parameter span of each sample well as physical parameter codomain.
As shown in Figure 3, be the figure that crosses of physical property curve and deep lateral resistivity curve.In Fig. 3, horizontal ordinate is the deep lateral resistivity value obtained according to deep lateral resistivity curve, and ordinate is the physical parameter value obtained according to physical property curve, and colour code is oil saturation.
S104: the geological data obtaining work area, carries out geostatistical inversion to described geological data, obtains physical parameter data volume.
The geological data in work area can be obtained by field acquisition.Using described geological data as trend obligatory point, geostatistical inversion is carried out to described physical parameter curve, obtain the physical parameter data volume of work area reservoir.
Particularly, following method can be used to carry out geostatistical inversion:
1) obtained the geological data in work area by field acquisition, obtain road collection data (such as CRP gather data) after treatment.
2) set up random walk and choose 1 seismic trace randomly, the conditional probability density function of this seismic trace is estimated.
3) according to Sampling, from this conditional probability distribution function, randomly draw 1 value, computational reflect coefficient, and carry out convolution, to generate synthetic seismogram with wavelet.
4) synthetic seismogram and actual seismic road are contrasted.If comparatively close to actual seismic road, then accept this synthetic seismogram, calculate and stop, and turn to next seismic trace.If differ more, then do not accept this synthetic seismogram, repeat step 3) and 4).
5) until chosen all seismic traces, thus physical parameter data volume is obtained.
S105, chooses advantage reservoir according to described physical parameter codomain and described physical parameter data volume.
Particularly, can using reservoir corresponding on physical parameter data volume for physical parameter codomain in work area as advantage reservoir.
Further, the region corresponding to described physical parameter codomain can be chosen on physical parameter data volume, then the explanation of layer position is carried out to described physical parameter data volume, using the reservoir corresponding to this region as advantage reservoir.
In some embodiments, after choosing advantage reservoir, the sample point of the advantage reservoir chosen can be extracted, be generated the planimetric map of advantage reservoir by described sample point, and then according to the Distribution Pattern of this planimetric map determination advantage reservoir.
Fig. 4 is the planar distribution figure of advantage reservoir, and wherein, the darker region of color is the region that physical parameter value is higher.
As shown in Figure 5, for certain work area application physical property curve carries out the comparison diagram that geostatistical inversion and the method for the conventional wave impedance of application carry out the sectional view that geostatistical inversion obtains.The top of Fig. 5 is the sectional view that application physical property curve carries out geostatistical inversion and obtains, and bottom is the sectional view that the method applying conventional wave impedance is carried out geostatistical inversion and obtained.Containing a large amount of resinous shale and mud stone in the reservoir in this work area, resinous shale and mud stone all have low-impedance feature.Therefore as can be seen from Figure 5, mud stone and oil shale formation can not be distinguished by conventional wave impedance inversion, and apply physical property curve and carry out inverting, resinous shale advantage reservoir can be identified preferably, thus can predict preferably the Distribution Characteristics of resinous shale advantage reservoir.
The method of advantage of the choosing reservoir of the embodiment of the present application, physical property curve is reconstructed based on interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, then based on physical property curve and the geostatistical inversion of reconstruct, the reservoir in work area is chosen.Compared with prior art, because described physical property curve can reflect the physical parameters such as the porosity and permeability of reservoir all sidedly, therefore the method for advantage of the choosing reservoir of the embodiment of the present application, can improve the accuracy rate that in reservoir, advantage reservoir is chosen, advantage reservoir that can be good to physical property in reservoir is well predicted.
Although depict the application by embodiment, those of ordinary skill in the art know, the application has many distortion and change and do not depart from the spirit of the application, and the claim appended by wishing comprises these distortion and change and do not depart from the spirit of the application.
Claims (8)
1. choose a method for advantage reservoir, it is characterized in that, comprising:
Obtain the interval transit time curve of sample well in work area, deep lateral resistivity curve and shallow side direction resistivity curve;
Based on described interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, pass through formula
product linearity curve, wherein, Ac is the interval transit time value of interval transit time curve, Rlld is the deep lateral resistivity value of deep lateral resistivity curve, Rlls is the shallow side direction resistivity value of shallow side direction resistivity curve, the maximal value that max (Ac) is interval transit time in interval transit time curve, the minimum value that min (Ac) is interval transit time in interval transit time curve, n is the profile amplitude index of interval transit time curve;
According to described physical property curve, determine physical parameter codomain;
Obtain the geological data in described work area, geostatistical inversion is carried out to described geological data, obtain physical parameter data volume;
Advantage reservoir is chosen according to described physical parameter codomain and described physical parameter data volume.
2. the method for claim 1, is characterized in that, described based on described interval transit time curve, deep lateral resistivity curve and shallow side direction resistivity curve, passes through formula
product linearity curve, specifically comprises:
Obtain maximal value and the minimum value of interval transit time in the profile amplitude index of described interval transit time curve and described interval transit time curve;
Obtain the degree of depth of sample well, according to described degree of depth determination data point;
For each data point, the interval transit time value of this data point is obtained according to interval transit time curve, according to the deep lateral resistivity value of this data point of deep lateral resistivity curve acquisition, the shallow side direction resistivity value of this data point is obtained according to shallow side direction resistivity curve, based on maximal value and the minimum value of described interval transit time value, deep lateral resistivity value, shallow side direction resistivity value, profile amplitude index and interval transit time, pass through formula
calculate the physical parameter value of this data point;
According to the physical parameter value of described data point, by the method product linearity curve of curve.
3. the method for claim 1, is characterized in that, described according to described physical property curve, determines physical parameter codomain, specifically comprises:
Cross analysis is carried out to described physical property curve and deep lateral resistivity curve, determines physical parameter codomain.
4. method as claimed in claim 3, it is characterized in that, carrying out in the process of cross analysis to described physical property curve and deep lateral resistivity curve, physical parameter value is greater than first threshold and deep lateral resistivity value is greater than the reservoir of Second Threshold as target reservoir, using the physical parameter span of target reservoir as physical parameter codomain.
5. the method for claim 1, is characterized in that, describedly chooses advantage reservoir according to described physical parameter codomain and described physical parameter data volume, specifically comprises:
Using reservoir corresponding on described physical parameter data volume for described physical parameter codomain as advantage reservoir.
6. method as claimed in claim 5, is characterized in that, the described reservoir that described physical parameter codomain is corresponding on described physical parameter data volume, as advantage reservoir, specifically comprises:
Choose the region that described physical parameter codomain is corresponding on described physical parameter data volume;
The explanation of layer position is carried out, using reservoir corresponding for this region as advantage reservoir to described physical parameter data volume.
7. the method for claim 1, is characterized in that, the interval transit time curve of sample well, deep lateral resistivity curve and shallow side direction resistivity curve in described acquisition work area, specifically comprise:
Acoustic logging is carried out to the sample well in work area, obtains the interval transit time data of described sample well, and generate the interval transit time curve of described sample well based on described sonic data;
Deep lateral resistivity well logging is carried out to described sample well, obtains the deep lateral resistivity data of described sample well, and based on the deep lateral resistivity curve of sample well described in described deep lateral resistivity data genaration;
Shallow side direction resistivity logging is carried out to described sample well, obtains the shallow side direction resistivity data of described sample well, and generate the shallow side direction resistivity curve of described sample well based on described shallow side direction resistivity data.
8. the method for claim 1, is characterized in that, after choosing advantage reservoir, described method also comprises:
From the advantage reservoir chosen, choose sample point, generated the planar distribution figure of this advantage reservoir by described sample point.
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