CN110469327A - A kind of approximant three-dimensional evaluation method of carbonate reservoir well logging of five steps - Google Patents
A kind of approximant three-dimensional evaluation method of carbonate reservoir well logging of five steps Download PDFInfo
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- CN110469327A CN110469327A CN201910711929.8A CN201910711929A CN110469327A CN 110469327 A CN110469327 A CN 110469327A CN 201910711929 A CN201910711929 A CN 201910711929A CN 110469327 A CN110469327 A CN 110469327A
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- payzone
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The invention discloses a kind of approximant three-dimensional evaluation methods of carbonate reservoir well logging of five steps, remove shale layer, carbonaceous layer in conjunction with three porosity curve, resistivity and electric imaging logging curve using GR spectrometry logging curve；The stratum of the rather low resistance under high background is found as destination layer；Determining destination layer is divided into payzone and non-payzone, then removes payzone；Graded quantitative evaluation is carried out to payzone；Acoustic logging data is far detected using orientation and determines that crack, hole spread are analyzed, and the result of step S4 is modified and is adjusted on this basis, comprehensive three-dimensional evaluation.The present invention can effectively solve previous logger investigation depth shallowly and formation heterogeneity bring explains uncertainty, and production cost is effectively reduced, improves carbonate exploration development efficiency.
Description
Technical field
The invention belongs to technical field of geophysical exploration, and in particular to a kind of approximant carbonate reservoir well logging of five steps
Three-dimensional evaluation method.
Background technique
Carbonate reservoir is due to its porosity is low, heterogeneity is strong, reservoir cross directional variations are very fast etc., so that utilizing
The conclusion that Conventional Logs, imaging series well-log information obtain is often quite different with formation testing result.This paper presents with normal
Based on advising well-log information, two-dimentional qualitative recognition and quantitative assessment are carried out using data such as bilaterally curve, Electrical imaging, XMAC,
Advantage of the remote Detection Techniques in orientation in terms of orientation recognition, detection is given full play to, fracture cave reservoir within the scope of borehole wall 40m is analyzed
Spatial situation forms the comprehensive three-dimensional logging evaluation technology of the approximant carbonate reservoir of a set of five perfect steps.The skill
Art achieves preferable effect in practical applications, provides scientific basis for later period formation testing and reservoir reconstruction.
Summary of the invention
It is approached in view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing five steps of one kind
The three-dimensional evaluation method of formula carbonate reservoir well logging, solves carbonate reservoir heterogeneity and existing logging instrument investigation depth is shallow
Caused by well log interpretation conclusion and formation testing the problem of not being inconsistent.
The invention adopts the following technical scheme:
A kind of approximant three-dimensional evaluation method of carbonate reservoir well logging of five steps, comprising the following steps:
S1, removed using GR spectrometry logging curve in conjunction with three porosity curve, resistivity and electric imaging logging curve
Shale layer, carbonaceous layer；
S2, the stratum of rather low resistance under high background is found as destination layer；
S3, the step S2 destination layer determined is divided into payzone and non-payzone, then removes payzone；
S4, graded quantitative evaluation is carried out to the payzone of step S3；
S5, acoustic logging data is far detected using orientation determine that crack, hole spread are analyzed, on this basis to step S4
Result be modified and adjust, comprehensive three-dimensional evaluation.
Specifically, using the potassium thorium curve in GR spectrum curve, removing the non-reservoir of shale, carbonaceous in step S1.
Specifically, using Conventional Logs, longitudinally comparison and 360 ° of directions in the orientation radial 0~3m are comprehensive in step S2
Response characteristic carries out two analyses, finds destination layer.
Specifically, according to log numerical values recited, morphological feature and imaging data feature, payzone is determined in step S3
Property be divided into pore type, hole type, slit formation, hole seam it is compound.
Specifically, total porosity is intersected with the fracture porosity of imaging calculating, Areal porosity respectively, is established in step S4
Reservoir grading interpretation chart is quantitatively divided into payzone I, II, III reservoir.
Further, the geologic bodies such as crack, hole using FMI imaging data in the orientation radial 0~0.5cm carry out three
The three-dimensional evaluation of dimension, and seven parameters are stitched to the hole that logging evaluation obtains using rock core imaging data and carry out quantitatively calibrating, utilize mark
Crack, hole parameter after fixed carry out graded quantitative evaluation near wellbore formation payzone.
Specifically, far detecting acoustic logging data using orientation in step S5 and determining away from the crack in 3~40m of the borehole wall, hole exhibition
Cloth is analyzed.
Compared with prior art, the present invention at least has the advantages that
The approximant three-dimensional evaluation method of carbonate reservoir well logging of five steps of one kind of the invention, makes well log interpretation evaluation by original
0-3m within the scope of 360 ° within the scope of comprehensive response evaluation expand to that 0-40m, comprehensive comprehensive solid is commented within the scope of 360 °
Valence expands explanation range, improves the Explanation Accuracy of heterogeneous reservoir, greatly improves meeting for well log interpretation and formation testing
Rate.
Further, step S1 removes non-reservoir diminution target zone, while avoiding missing high uranium reservoir.
Further, the compacted zone of great-great-grandfather is removed in step S2 setting, further reduces destination layer.
Further, step S3 utilizes total porosity curve destination layer further division payzone and non-payzone, further
Destination layer, that is, payzone is reduced, then payzone is further divided into pore type, hole type, slit formation, hole according to various well-log informations
Compound four class is stitched in hole, is prepared for Quantitative Evaluation of Reservoirs.
Further, step S4 utilizes two that total porosity is intersected with the fracture porosity of imaging calculating, Areal porosity respectively
Four class reservoirs of the qualitative division of step 3 are risen to quantitative assessment by a crossplot, are quantitatively divided into I, II, III reservoir.
Further, on the basis of step S4, the ground such as I, II, III Reservoir Fracture, hole are analyzed within the scope of 0~0.5m
The orientation of development of plastid reaches preliminary 3 D stereo evaluation.
Further, far detected with orientation acoustic logging data determine away from 3~40m of the borehole wall crack, hollow spaces spread into
Row stereoscopic analysis, determines the azimuth-range of its development, really realizes 3 D stereo overall merit within the scope of radial 0~40m.
In conclusion the present invention can effectively solve, previous logger investigation depth is shallow and formation heterogeneity bring solution
Uncertainty is released, production cost is effectively reduced, improves carbonate exploration development efficiency.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is porosity cross plot, wherein (a) is porosity and the fracture porosity cross plot that imaging calculates, and (b) is
Areal porosity and total porosity cross plot；
Fig. 3 is Ordovician, tarim Basin carbonate reservoir integrated interpretation result map.
Specific embodiment
Three-dimensional evaluation method, including following step referring to Fig. 1, the approximant carbonate reservoir of the present invention five steps of one kind is logged well
It is rapid:
S1, remove shale layer, carbonaceous layer；
Remove mud in conjunction with logs such as three porosity curve, resistivity and Electrical imagings using GR spectrometry logging curve
Matter layer, carbonaceous layer.
Shale layer is mainly shown as high natural radioactivity, and especially with a height of main feature of thorium potassium content, resistivity is lower, sound
The wave time difference is higher, and neutron porosity significantly increases, photoelectric absorption cross-section index low value, and bulk density slightly reduces, acoustic-electric imaging
On show as dead color, can be appreciated that apparent stratiform or current bedding sometimes.Carbonaceous layer natural gamma is not high, and neutron porosity is high
Value, bulk density is smaller, and interval transit time is higher, more similar to the response characteristic of reservoir, except that resistivity is higher.This
Two kinds of layers are all non-reservoir, it is necessary to identify and get rid of first.
S2, destination layer is found；
On the basis of step S1, find the rather low resistance under high background (boundary value of resistivity is different because of area)
Stratum, the target zone as found, but the influence of pyrite is excluded by the curves such as density and photoelectric absorption interface index.
It is comprehensive that 360 ° of directions in (borehole axis direction) and radial (vertical borehole axis) orientation 2m are longitudinally compared using Conventional Logs
It closes response characteristic and carries out two analyses, find destination layer.
S3, removing payzone；
It is main according to total porosity curve in destination layer, reference imaging well-log information destination layer be divided into payzone and
Non- payzone.According to various log numerical values reciteds, morphological feature and imaging data feature, hole is divided into payzone is qualitative
Type, hole type, slit formation, hole stitch compound four class.
Pore type:
Reservoir reservoir space is based on intergranular pore, intracrystalline pore and dissolution pore, solution cavity, crack agensis, on Electrical imaging image
It is not easily distinguishable.Nuclear magnetic resonance log feature are as follows: T2 spectrum is in unimodal, and spectral peak is distributed between 80~400ms, and amplitude is small.This be by
Small in such reservoir porosity, based on Surface Relaxation, effecive porosity is only 2.5%~4.0%.Resistivity is in 1000 Ω
M or more, this kind of reservoir storage and collection performance is poor, and production capacity is low.
Hole type:
The reservoir space of reservoir based on solution cavity, less develop by crack.Bilaterally in " U " font under high background value, electricity
In dark-coloured (black) spot of bulk or band on image bright background.On nuclear magnetic resonance log image, T2 spectrum in unimodal,
Spectral peak is distributed between 80~700ms, and based on volume relaxation, effecive porosity is 3.0%~7.5%.Due to the hole of hole
Diameter is larger, and the storage and collection performance of this reservoir is good, and the continuous production time is long.
Slit formation:
Reservoir reservoir space based on crack or microcrack, less develop by solution cavity, dissolution pore.It is bilaterally in needle pattern low value,
The dark-coloured sine curve of dense distribution is shown as on Electrical imaging image, Unimodal Distribution is presented in nuclear magnetic resonance log T2, and peak value is located at T2
The porosity in the left side of cutoff value, such reservoir is generally lower, and apparent positive variance is presented in dual laterolog curve, and calculating is split
Slot apertures porosity is greater than 0.001%；Due to good penetrability, resistivity is relatively low, mostly less than 500 Ω m.This kind of reservoir permeability is good,
But reservoir space is small, and the continuous production time is generally shorter.
Hole seam is compound:
Reservoir space is made of dissolution pore, solution cavity and crack.Double direction findings are distributed in " U " font and needle pattern, Electrical imaging image
It is shown as dark spots (dissolution pore), patch (solution cavity) and the irregular dead color of sinusoidal of non-uniform Distribution under bright background
Striped (crack).Bimodal or three peaks are presented in the T2 spectrum of nuclear magnetic resonance log, and the distribution of spectral peak is 20~1000ms.Such storage
The resistivity value of layer is very low, often less than 100 Ω m.Total porosity is 4%~8%, and fracture porosity is greater than 0.0002%.This
Kind reservoir belongs to hole, hole, the compound reservoir of seam, the existing place for preserving oil gas, and the channel for having oil gas to flow, and is extraordinary
Reservoir.
S4, graded quantitative evaluation；
In payzone, total porosity is intersected with the fracture porosity of imaging calculating, Areal porosity respectively, establishes reservoir grading
Interpretation chart is quantitatively divided into payzone I, II, III reservoir.
On the basis of conventional logging two-dimension analysis, crack, hole of the FMI imaging data in the radial orientation 0.5cm are utilized
The geologic bodies such as hole carry out 3 D stereo evaluation.And seven parameters are stitched to the hole that logging evaluation obtains using rock core imaging data and are carried out
Quantitatively calibrating carries out graded quantitative evaluation near wellbore formation payzone using calibrated crack, hole parameter.
The characteristics of carbonate rock is that heterogeneity is strong, and hole, hole do not have production capacity without connectivity in some reservoirs.Cause
And according to formation testing interval data and production capacity standard, the pass of the fracture porosity, Areal porosity that are calculated using total porosity and imaging
System, is divided into three classes the validity of carbonate reservoir.Total porosity in Fig. 2 is intersected with the fracture porosity that imaging calculates
Figure is mainly applicable in same layer hole hole seam all with respect to the reservoir of development；Areal porosity and total porosity cross plot are mainly applicable in hole
The reservoir of opposite development.Four class reservoirs of qualitative division can be quantitatively divided into I, II, III reservoir according to Fig. 2, in order to more straight
It sees available corresponding quantitative interpretation standard according to fig. 2 and is shown in Table 1.
S5, comprehensive three-dimensional evaluation.
The classification of reservoir near the borehole wall has quantitatively been obtained by step S1~S4, is only within the scope of 360 ° of near wellbore formation well week
The concentrated expression of reservoir cannot reflect circumferential reservoir situation of change.Again since carbonate formation Sedimentary Age is remote, undergo more
Secondary tectonic movement by strong weathering, is degraded and eluviation, and formation heterogeneity is strong, and reservoir cross directional variations are very fast.
Therefore, one, the two class reservoirs obtained, or even a kind of reservoir also can not necessarily obtain high yield commercial hydrocarbon flow, must
Sound wave reflection wave imaging well-log information need be far detected in conjunction with orientation and carry out space multistory imaging within the scope of borehole wall 40m, determine
Crack and the orientation and range of hole development, adjust and correct to step S1~S4 conclusion obtained.It finally determines comprehensive
Close three-dimensional evaluation achievement.
It far detects acoustic logging data determination using orientation to be analyzed away from the crack within the scope of borehole wall 40m, hole spread, with this
Not known so as to avoid being explained because of formation heterogeneity bring according to the result of step S4 is modified and is adjusted
Property.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to Fig. 3, being Ordovician, tarim Basin carbonate reservoir integrated interpretation result map, first is GR in figure
And well curve, second are depth track, and third road is to explain reservoir levels road, and the 4th is to explain Reservoir type road, the 5th
Road is to explain oil gas conclusion road, and the 6th is well logging, and the 7th is al-lateral resistivity road, and the 8th is sound wave curve,
9th calculates porosity for well logging, and the tenth far detect No. 7 orientation downgoing reflection waves of sound wave for orientation, the 10th one be No. 3
Orientation uplink back wave.The fracture porosity plotted point that 107, No. 108 floor total porositys and imaging calculate in figure is respectively fallen in
Interpretation chart (Fig. 2) one kind hole hole seam type and two pores hole seam type areas, and No. 109 floor hole from imaging is relatively developed, total hole
Porosity and Areal porosity plotted point fall in two class hole type area of interpretation chart (Fig. 2).
Therefore, No. 107 floor are construed to a kind of hole and stitch compound reservoir, and it is compound that No. 108 floor are construed to two class holes seam
Reservoir, No. 109 floor are construed to two class hole type reservoirs.Corresponding No. 7 orientation down going waves of interval have the spot of some dead colors, this is small
Hole reflectance signature, but be not to develop very much.No. 3 orientation upgoing waves are other than hole reflects, an also apparent axis in the same direction,
It is typical fracture surface reflection, from lower right corner reflected energy rose figure as can be seen that the crack is in 10 ° of directions of south by east
On, which is 70 °, it is close east-west, it is remote away from borehole wall 3-25m.To the interval formation testing, day oil-producing more than 40 after acid fracturing
Side, gas 10,000 are multi-party.Oil test data has also sufficiently proved the correctness that orientation far detects back wave interpretation of logging data.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (7)
- The three-dimensional evaluation method 1. a kind of approximant carbonate reservoir of five steps is logged well, which comprises the following steps:S1, remove shale in conjunction with three porosity curve, resistivity and electric imaging logging curve using GR spectrometry logging curve Layer, carbonaceous layer；S2, the stratum of rather low resistance under high background is found as destination layer；S3, the step S2 destination layer determined is divided into payzone and non-payzone, then removes payzone；S4, graded quantitative evaluation is carried out to the payzone of step S3；S5, acoustic logging data is far detected using orientation determine that crack, hole spread are analyzed, on this basis to the knot of step S4 Fruit is modified and adjusts, comprehensive three-dimensional evaluation.
- The three-dimensional evaluation method 2. the approximant carbonate reservoir of five steps according to claim 1 is logged well, which is characterized in that step In rapid S1, using the potassium thorium curve in GR spectrum curve, remove the non-reservoir of shale, carbonaceous.
- The three-dimensional evaluation method 3. the approximant carbonate reservoir of five steps according to claim 1 is logged well, which is characterized in that step In rapid S2, using Conventional Logs, longitudinally comparison and the comprehensive response characteristic in 360 ° of directions in the orientation radial 0~3m carry out two Destination layer is found in analysis.
- The three-dimensional evaluation method 4. the approximant carbonate reservoir of five steps according to claim 1 is logged well, which is characterized in that step In rapid S3, according to log numerical values recited, morphological feature and imaging data feature, pore type, hole are divided into payzone is qualitative Hole type, slit formation, hole seam are compound.
- The three-dimensional evaluation method 5. the approximant carbonate reservoir of five steps according to claim 1 is logged well, which is characterized in that step In rapid S4, total porosity is intersected with the fracture porosity of imaging calculating, Areal porosity respectively, establishes reservoir grading interpretation chart, Payzone is quantitatively divided into I, II, III reservoir.
- The three-dimensional evaluation method 6. the approximant carbonate reservoir of five steps according to claim 5 is logged well, which is characterized in that benefit 3 D stereo evaluation is carried out with geologic bodies such as crack, hole of the FMI imaging data in the orientation radial 0~0.5cm, and utilizes rock Heart imaging data stitches seven parameters to the hole that logging evaluation obtains and carries out quantitatively calibrating, utilizes calibrated crack, hole parameter Graded quantitative evaluation is carried out near wellbore formation payzone.
- The three-dimensional evaluation method 7. the approximant carbonate reservoir of five steps according to claim 1 is logged well, which is characterized in that step In rapid S5, acoustic logging data determination is far detected using orientation and is analyzed away from the crack in 3~40m of the borehole wall, hole spread.
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| CN113689453A (en) * | 2021-08-24 | 2021-11-23 | 中石化石油工程技术服务有限公司 | Method, device and equipment for automatically identifying well logging image cracks and storage medium |
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