CN103630945B - A kind of method identifying volcano rock reservoir fluid - Google Patents
A kind of method identifying volcano rock reservoir fluid Download PDFInfo
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Abstract
The invention provides a kind of technical method identifying volcano rock reservoir fluid, belong to oilfield prospecting developing field.Said method comprising the steps of: (1) utilize rock core, imaging data scale bilateral to crack response characteristic; (2) according to the two lateral crevasse response modes set up in step (1), fracture development section is found out; Then production test conclusion is utilized to find out gas-bearing formation wherein and non-gas-bearing formation; Analyze described gas-bearing formation and non-gas-bearing formation respectively and then obtain the dual laterolog response feature of slit formation gas-bearing formation and the non-gas-bearing formation of slit formation; (3) contrast the dual laterolog response feature of described slit formation gas-bearing formation and the non-gas-bearing formation of slit formation, the distinction of both analyses, set up the differentiation foundation of gas-bearing fracture type reservoir and gas-free crack elimination; (4) bilateral of crack and fluid Research on differences is set up to recognition mode according to step (3); (5) utilize bilateral to carry out fluid identification to principle to non-crack elimination, thus realize the fluid identification of whole reservoir.
Description
Technical field
The invention belongs to petroleum prospecting, development field, relate to the logging technology identifying reservoir fluid, be specifically related to a kind of method identifying volcano rock reservoir fluid.
Background technology
By al-lateral resistivity well logging acquisition two logging traces namely: deep lateral resistivity curve, shallow side direction resistivity curve.Deep lateral resistivity curve investigation depth is dark, can reflect the true resistivity of depths, stratum preferably, i.e. virgin zone resistivity; And shallow side direction resistivity mainly detects the change in resistance of Around A Borehole rock stratum, just reflect the resistivity of invaded zone in permeable strata well section, i.e. mud filtrate resistivity.Due to the investigation depth of depth side direction and the difference of position, to cause in stratum the otherness that no matter all can cause al-lateral resistivity containing fluid or crack.
The difference of al-lateral resistivity curve not only reflects fluid but also reflect FRACTURE CHARACTERISTICS.For a long time, the otherness being difficult to distinguish al-lateral resistivity in crack elimination is reflection characteristic of fluid or FRACTURE CHARACTERISTICS, also have no professional institution and inquired into the difference utilizing the otherness of al-lateral resistivity to distinguish crack and reservoir fluid, therefore utilize the method for the otherness crack identification type properties of fluid in bearing stratum of al-lateral resistivity for a long time ignore by professional person.
Utilize the otherness identification fluid of al-lateral resistivity, its principle is:
When the reservoir oily in agensis crack, because the resistivity on stratum is all the time higher than the resistivity of mud filtrate, so when the invaded zone resistivity that in mud filtrate displacement stratum, oil gas is formed is always lower than the virgin zone resistivity on stratum, now, deeply, will there is difference in shallow side direction resistivity value, namely deep lateral resistivity value is greater than shallow side direction resistivity value, is called the positive variance feature of al-lateral resistivity curve.
When the reservoir in agensis crack is moisture, local water (demineralized water mud is outer) resistivity is all lower than mud filtrate resistivity, so the invaded zone resistivity that mud filtrate eliminating local water is formed in most water-bearing strata is all higher than virgin zone resistivity, now, deep lateral resistivity value is less than shallow side direction resistivity value, is called the negative variance feature of al-lateral resistivity curve.Therefore, the positive and negative otherness of al-lateral resistivity is utilized effectively can to judge the fluid properties of non-fracture reservoir.
Utilize the otherness crack identification of al-lateral resistivity, its principle is: generally, and the al-lateral resistivity value of fracture development section decreases, and it is relevant with the fluid properties in development degree of micro cracks in oil, fracture aperture and crack that it reduces amplitude.In high angle fracture, deep lateral resistivity change is little, and shallow side direction resistivity obviously reduces owing to being subject to the impact in crack, and depth side direction resistivity defines larger positive separation (namely deep lateral resistivity is greater than shallow side direction resistivity); When there is low angle frature in stratum, the resistivity of depth side direction all obviously reduces, and shows as indifference XOR negative variance therebetween, and namely shallow side direction resistivity is more than or equal to deep lateral resistivity.Therefore, the otherness of al-lateral resistivity can reflect Reservoir Fracture character equally.
Low hole is oozed, fine and close complicated volcanic rock reservoir contains fluid place often along with the growth in crack, and the otherness of al-lateral resistivity is the result of fluid and crack combined action, and this is just for utilizing the otherness identification fluid of al-lateral resistivity to bring a difficult problem.On the other hand due to the existence that crack affects al-lateral resistivity, cause explanation personnel in non-fractured reservoir section, fluid has a misgiving to utilize al-lateral resistivity otherness to differentiate.Therefore, in crack elimination, how effectively from al-lateral resistivity curve, gas-bearing formation response characteristic is identified, great to the fluid identification technical meaning of volcanic rock reservoir.
In real process, al-lateral resistivity is the result by multifactor joint effects such as mud resistivity, side-bed resistivity, invaded zone resistivity, zone thickness and invasion depth.When utilizing otherness identification fluid or the characteristic of crack of al-lateral resistivity, first to analyze according to the concrete condition of study area.
Summary of the invention
The object of the invention is to solve domestic owing to being difficult to distinguish the otherness that al-lateral resistivity convection cell and FRACTURE CHARACTERISTICS respond, cause in complex fracture reservoir, be difficult to apply the otherness of al-lateral resistivity curve directly, carry out the difficult problem of fluid differentiation accurately, a kind of method identifying volcano rock reservoir fluid is provided, utilizes the crack response characteristic of rock core, imaging data scale al-lateral resistivity; Find out slit formation gas-bearing formation and the non-gas-bearing formation of slit formation in conjunction with production test result, the bilateral both summing up respectively is to response characteristic; The otherness of two lateral response of contrast slit formation gas-bearing formation and the non-gas-bearing formation of slit formation, namely finds the bilateral of gas-bearing formation to response characteristic; Finally set up the bilateral of crack and fluid Difference to recognition mode, thus realize the effective identification at complicated volcanic rock reservoir Mesosphere.
The present invention is achieved by the following technical solutions:
Identify a method for volcano rock reservoir fluid, said method comprising the steps of:
(1) utilize rock core, imaging data scale bilateral to crack response characteristic: first use drilling core graduation imaging data, sum up the feature of crack in imaging; And then utilize described imaging data scale al-lateral resistivity curve, and analyze the response characteristic of crack on described al-lateral resistivity curve, the two lateral crevasse response modes of final foundation;
(2) according to the two lateral crevasse response modes set up in step (1), fracture development section is found out; Then production test conclusion is utilized to find out gas-bearing formation wherein and non-gas-bearing formation; Analyze described gas-bearing formation and non-gas-bearing formation respectively and then obtain the dual laterolog response feature of slit formation gas-bearing formation and the non-gas-bearing formation of slit formation;
(3) contrast the dual laterolog response feature of described slit formation gas-bearing formation and the non-gas-bearing formation of slit formation, the distinction of both analyses, set up the differentiation foundation of gas-bearing fracture type reservoir and gas-free crack elimination;
(4) bilateral of crack and fluid Research on differences is set up to recognition mode according to step (3);
(5) utilize bilateral to carry out fluid identification to principle to non-crack elimination, thus realize the fluid identification of whole reservoir.
Bilateral in described step (4) refers to recognition mode:
If the positive variance of al-lateral resistivity curve is obvious, and has double track phenomenon, but the numerical value of resistivity reduces, be then identified as low angle frature gas-bearing formation;
If the positive variance of al-lateral resistivity curve is obvious, and has double track phenomenon, be then identified as high angle frature gas-bearing formation;
If al-lateral resistivity curve overlaps substantially, and the accidental convergence difference in local, be then identified as the non-gas-bearing formation of low angle frature;
If the positive variance of al-lateral resistivity curve is obvious, and Bearberry Extract, be then identified as the non-gas-bearing formation of high angle frature.
Described bilateral in described step (5) refers to principle: during reservoir gas-bearing, and al-lateral resistivity curve has positive variance; When reservoir is moisture, al-lateral resistivity curve co-insides or negative variance.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention establishes non-gas-bearing formation fracture reservoir and slit formation gas-bearing formation bilateral first clearly to response modes, and contrast the difference of its bilateral to otherness, solve long-standing problem to log well the identification problem of professional crack and reservoir gas-bearing, this publication published at home did not occur;
(2) the present invention is from the bilateral of the concentrated expression of crack and fluid to otherness, and comparative analysis goes out the bilateral of gas-bearing formation to response message, provides method foundation for solving a complicated crack elimination fluid identification difficult problem.Improve fluid identification precision significantly;
(3) the present invention is workable, and it is directly perceived, clear to identify, saves production cost, and has very high using value;
(4) of the present inventionly have a extensive future, its method step can promote the use of in tight sand and carbonatite very easily.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of identification volcano rock reservoir fluid of the present invention.
Fig. 2 utilizes rock core, imaging scale al-lateral resistivity Curves Recognition low angle frature design sketch in process of the present invention.
Fig. 3 utilizes rock core, imaging scale al-lateral resistivity Curves Recognition high angle frature design sketch in process of the present invention.
Fig. 4 be in process of the present invention low angle frature gas-bearing formation bilateral to response characteristic figure.
Fig. 5 be in process of the present invention high angle frature gas-bearing formation bilateral to response characteristic figure.
Fig. 6 be in process of the present invention the non-gas-bearing formation bilateral of low angle frature to response characteristic figure.
Fig. 7 be in process of the present invention the non-gas-bearing formation bilateral of high angle frature to response characteristic figure.
Embodiment
The comprehensive response results in the otherness of al-lateral resistivity fluid and crack often, utilizes the otherness identification fluid of al-lateral resistivity curve, often accompanies crannied interference, affect fluid identification precision.In order to solve this difficult problem, the al-lateral resistivity otherness of fracture type gas-bearing formation and the non-gas-bearing formation of slit formation is analyzed, the impact of gas-bearing formation on al-lateral resistivity is analyzed from both difference, and finally set up two lateral modes of crack and gas-bearing formation Research on differences, be gas-bearing formation identification supplying method foundation.
Below in conjunction with accompanying drawing, the present invention is described in further detail:
(1) utilize rock core, imaging data scale bilateral to crack response characteristic: first use drilling core graduation imaging data, sum up the feature of crack in imaging; And then utilize imaging data scale al-lateral resistivity curve, analyze the response characteristic of crack on al-lateral resistivity, the two lateral crevasse response modes of final foundation.
Rock core is that subsurface features reflects the most really, because cost of coring is very high, therefore can not can obtain rock core information by every mouthful of well, the coring data of the full well of more impossible acquisition.Scale Image Logging Data can only be gone with limited rock core information, analyze the response characteristic in crack on imaging data.Imaging data neither have by every mouthful of well, finally also removes scale al-lateral resistivity curve with imaging data, analyzes the response characteristic of crack on al-lateral resistivity curve.Al-lateral resistivity well logging, as one of conventional logging suite, has a wide range of applications in volcanic rock reservoir.
As shown in Figure 2, rock core is grown and has low angle crack, on imaging data, display is the mild sinusoidal curve of black.Position imaging showing low angle frature growth is rendered on al-lateral resistivity curve, two curve co-insides.
As Fig. 3, rock core is grown and has high angle fracture, on imaging data, display is the sinusoidal curve that black rises steeply.Render on al-lateral resistivity curve by position imaging showing high angle frature growth, two curves have positive variance, and namely deep lateral resistivity value is greater than shallow side direction resistivity value.
The two lateral crevasse response modes of final foundation, as shown in table 1:
Table 1
(2) according to the two lateral crevasse response modes set up in step 1, find out fracture development section (establish the recognition mode in crack in table 1, namely on imaging data to al-lateral resistivity curve occurs corresponding response characteristic just describes the existence in crack; Crack have high angle frature and low angle frature point, but all there is growth in the crack in the crack or two types of growing which kind of type, all illustrates that this section of reservoir is fracture development section.); Then (can show certain mouthful of well in test result at what depth range, daily gas is how many all places, and daily output water how much side, therefore the stratum of this depth range is that gas-producing zone is very clear to utilize production test conclusion to find out gas-bearing formation wherein and non-gas-bearing formation.); And then analyze the dual laterolog response feature of slit formation gas-bearing formation and the non-gas-bearing formation of slit formation respectively:
According to two lateral crevasse response modes, in conjunction with production test conclusion, find out low angle crack gas-bearing formation.Can find by analyzing, take Fig. 4 as the low angle frature gas-bearing formation of representative, the obvious positive variance of its al-lateral resistivity curve, and resistivity value reduces, and two curves have " double track " phenomenon of nearly average row.Take Fig. 5 as the high angle frature gas-bearing formation of representative, the obvious positive variance of al-lateral resistivity curve, dark side direction and shallow side direction positive variance tool " double track " phenomenon.Take Fig. 6 as the non-gas-bearing formation that the low angle frature of representative is grown, al-lateral resistivity curve overlaps substantially.Take Fig. 7 as the non-gas-bearing formation that the high angle frature of representative is grown, the obvious positive variance of al-lateral resistivity, dark side direction and shallow side direction difference have Convergent Phenomenon;
(3) contrast the bilateral of slit formation gas-bearing formation and the non-gas-bearing formation of slit formation to response characteristic, the otherness between finding out, this species diversity is because cause containing gas in reservoir.The distinction of the two lateral response of both analyses, sets up the differentiation foundation of gas-bearing fracture type reservoir and gas-free crack elimination.
According to the bilateral of the slit formation gas-bearing formation analyzed in step (3) and the non-gas-bearing formation of slit formation to response characteristic, first the non-gas-bearing formation of low angle frature gas-bearing formation and low angle frature is contrasted, find: it is abnormal that low angle frature gas-bearing formation has obvious low-resistance, namely al-lateral resistivity obviously reduces, and there is positive variance, there is " double track " phenomenon; And the depth side direction of growing the non-gas-bearing formation of low angle frature overlaps substantially, the accidental convergence difference in local.Then the non-gas-bearing formation of high angle frature gas-bearing formation and high angle frature is contrasted, find: positive variance appears in the al-lateral resistivity curve of high angle frature gas-bearing formation, has double track phenomenon; And the non-gas-bearing formation al-lateral resistivity curve positive variance of growing high angle frature is obvious, and positive variance has convergence.
(4) according to step (3), set up the bilateral of crack and fluid Research on differences to recognition mode, thus realize in crack elimination, utilize bilateral to otherness effectively identify fluid.
Set up the bilateral of crack and fluid Research on differences to recognition mode according to the comparative analysis result of step (3), wherein convergence distinguishes the key factor of crack and fluid, as shown in table 2.
Table 2
By table 2, the difference as can be seen from low angle frature gas-bearing formation and the non-gas-bearing formation of low angle frature: the reservoir gas-bearing of growing low angle frature makes resistivity value reduce, increases the otherness of depth side direction.Difference as can be seen from high angle frature gas-bearing formation and the non-gas-bearing formation of high angle frature: the reservoir gas-bearing of growing high angle frature, al-lateral resistivity curve, in " double track " phenomenon, changes reservoir because growing the Convergent Phenomenon of high angle frature al-lateral resistivity curve.Whether by these two conclusions, being easy to identify crack elimination is gas-bearing formation.
(5) on the basis of step (4), namely identify Reservoir Fracture and fluid bilateral under the otherness prerequisite of response characteristic, to non-crack elimination, utilize bilateral to principle, that is:, during reservoir gas-bearing, al-lateral resistivity curve has positive variance; When reservoir is moisture, al-lateral resistivity curve co-insides or negative variance.In conjunction with saturation computation auxiliary judgment according to carrying out gas and water reservoir identification, thus realize utilizing bilateral to otherness identification fluid.
Utilize the well logging interpretation application that method of the present invention is carried out certain gas field, it (is exactly mainly identify gas-bearing formation and water layer that well logging interpretation conclusion and test result contrast as shown in table 3 in fluid identification; Gas-bearing formation is the problem of gassiness rank with the difference of difference gas-bearing formation, but is all gas-bearing formation; Air water is the comprehensive response of gas, water with layer, is the transition of gas, water layer, carries out judging from saturation degree and residing construction location).
Table 3
Utilize the inventive method, to the 8 mouthfuls of wells of the gas field main body in study area and W2 well carry out process explain, the explanation results obtained and test result basically identical, as shown in table 3, therefrom can find out the successful utilizing the inventive method to obtain.
Technique scheme is one embodiment of the present invention, for those skilled in the art, on the basis that the invention discloses application process and principle, is easy to implement and application, and can sees effect very soon.
Claims (2)
1. identify a method for volcano rock reservoir fluid, it is characterized in that: said method comprising the steps of:
(1) utilize rock core, imaging data scale bilateral to crack response characteristic: first use drilling core graduation imaging data, sum up the feature of crack in imaging; And then utilize described imaging data scale al-lateral resistivity curve, and analyze the response characteristic of crack on described al-lateral resistivity curve, the two lateral crevasse response modes of final foundation;
(2) according to the two lateral crevasse response modes set up in step (1), fracture development section is found out; Then production test conclusion is utilized to find out gas-bearing formation wherein and non-gas-bearing formation; Analyze described gas-bearing formation and non-gas-bearing formation respectively and then obtain the dual laterolog response feature of slit formation gas-bearing formation and the non-gas-bearing formation of slit formation;
(3) contrast the dual laterolog response feature of described slit formation gas-bearing formation and the non-gas-bearing formation of slit formation, the distinction of both analyses, set up the differentiation foundation of gas-bearing fracture type reservoir and gas-free crack elimination;
(4) bilateral of crack and fluid Research on differences is set up to recognition mode according to step (3);
(5) utilize bilateral to carry out fluid identification to principle to non-crack elimination, thus realize the fluid identification of whole reservoir;
Bilateral in described step (4) refers to recognition mode:
If the positive variance of al-lateral resistivity curve is obvious, and has double track phenomenon, but the numerical value of resistivity reduces, be then identified as low angle frature gas-bearing formation;
If the positive variance of al-lateral resistivity curve is obvious, and has double track phenomenon, be then identified as high angle frature gas-bearing formation;
If al-lateral resistivity curve overlaps substantially, and the accidental convergence difference in local, be then identified as the non-gas-bearing formation of low angle frature;
If the positive variance of al-lateral resistivity curve is obvious, and Bearberry Extract, be then identified as the non-gas-bearing formation of high angle frature.
2. the method for identification volcano rock reservoir fluid according to claim 1, is characterized in that: the described bilateral in described step (5) refers to principle: during reservoir gas-bearing, and al-lateral resistivity curve has positive variance; When reservoir is moisture, al-lateral resistivity curve co-insides or negative variance.
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| CN111880234B (en) * | 2020-06-24 | 2022-09-30 | 西南石油大学 | Fine identification method for tight reservoir fractures based on conventional well logging |
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