CN109356577A - Tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio - Google Patents
Tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio Download PDFInfo
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- CN109356577A CN109356577A CN201811429785.9A CN201811429785A CN109356577A CN 109356577 A CN109356577 A CN 109356577A CN 201811429785 A CN201811429785 A CN 201811429785A CN 109356577 A CN109356577 A CN 109356577A
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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
Abstract
A kind of tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio, comprising the following steps: determine work area area coverage, and the measurement of individual well reserves abundance is carried out to wells whole in work area；According to individual well reserves abundance Distribution value feature, multiple reserves abundance sections are divided, statistics is in the drilling hole number in different abundance sections；The Drilling ratio for measuring different abundance sections gas well carries out product with the block gross area, obtains the gas-bearing area in each abundance section；Reserves abundance is averaged according to gas well in each abundance section and gas-bearing area product obtains reserves, and accumulation summation obtaining work area gross reserves.The present invention provides accurately reserves measuring methods, to provide foundation for gas field Efficient Development.
Description
Technical field
The present invention relates to Unconventional gas development reserves measuring methods to throw for the tight gas reservoir of large area gassiness
Enter after developing, under the conditions of having certain well pattern, using Drilling ratio as coefficient, determines that different reserves abundances distinguish cloth areas, in conjunction with
Single well point reserves abundance and plane subregion carry out the tight gas reservoir reserves measurement of large area distribution, more particularly, to one kind
Tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio.
Background technique
Reserves measurement is an element task of gas reservoir development, and volumetric method is the basic skills of gas pool reserve measurement, is obtained
It is widely applied, but can for different types of gas reservoir, there is bigger differences for the determination thinking of key parameter in formula, adopt
Take targetedly method it is larger to the reliability effect of result.For normal gas pools, generally there is specific gas-water interface, gas-bearing formation
Development is stablized, the gas reservoir gas-bearing area and gas pay thickness parameter of available determination, measures natural gas using conventional volumetric method
Reserves can reach higher reliability.And normal gas pools are different from for tight gas reservoir, formation condition and development characteristics, belong to
One seed type of unconventional gas reservoir, usual gas accumulations distribution area is larger, and gas bearing boundary is indefinite, and gas-bearing formation changes greatly, heterogeneity
By force, volumetric method measured reserves is directly utilized, key parameter gas-bearing area and the bad measurement of gas pay thickness, reserves result are not quasi- enough
Really.
Tight gas reservoir is all paid much attention to both at home and abroad as a kind of important natural gas resource, becomes gas production rising
Mainstay.China's tight gas is resourceful, and the Soviet Union's Sulige gas field for having been carried out scale development is the typical generation of such gas reservoir
Table, and effectively Ordos Basin, the Sichuan Basin and the exploration and development of Song-liao basin tight gas is pushed further to go deep into.Tight gas is opened
The measurement of hair reserves is gas reservoir development ability, Development Strategy is formulated and the important evidence of development plan design, simultaneously because fine and close
Gas well yield is low, production rate-maintenance capability is poor, and gas field stable yields is taken between relying primarily on well, needs continuous drilling new well, employs new storage
Amount be just able to maintain gas field long term stable production, therefore, for tight gas, reserves measure it is even more important, it usually needs blockette, into
The reserves measurement of the more rounds of row, provides safeguard resource for gas field stable yields.By gas reservoir types, distribution of gas reservoir, drilling hole number and parameter
The uncertainty of the multifactor impacts such as measurement, reserves measurement is larger, and especially for tight gas reservoir, gas reservoir boundary is indefinite, gas
Layer variation is big, needs a kind of reliability of new method raising reserves measurement.
Therefore, in order to solve many insufficient and defects of the above-mentioned prior art, it is necessary to study a kind of bore based on gas-bearing formation and meet
The tight gas reservoir reserves measuring method of rate.
Summary of the invention
The present invention is completed in view of at least one above problem, it should be noted that reserves abundance refers to gas reservoir unit
Area (A=1km2) reserves, hundred million sides of unit/km2。
Specifically, according to an aspect of the present invention, a kind of tight gas reservoir reserves measurement side based on gas-bearing formation Drilling ratio is provided
Method, it is characterised in that the following steps are included:
It determines work area area coverage, and the measurement of individual well reserves abundance is carried out to wells whole in work area；
According to individual well reserves abundance Distribution value feature, multiple reserves abundance sections are divided, statistics is in different abundance sections
Drilling hole number；
The Drilling ratio for measuring different abundance sections gas well carries out product with the block gross area, obtains each abundance section
Gas-bearing area；
Reserves abundance is averaged according to gas well in each abundance section and gas-bearing area product obtains reserves, and accumulation summation obtaining work
Area's gross reserves.
According to a further aspect of the invention, a kind of tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio is provided,
Be characterized in that the following steps are included:
All gas well interval of interest reserves abundance F are measured using volumetric method, determine gas well reserves abundance demarcation interval；
Each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodn, the sum of each section gas-bearing area is equal to work area
Total gas-bearing area A, i.e. A1+A2+A3+A4+ ... An=A；
Determine in each abundance section that gas well is averaged reserves abundance Fn, FnThe sum of gas well abundance/gas well number in=certain abundance section
Amount；
It is averaged reserves abundance F according to gas well in each abundance sectionnWith gas-bearing area AnProduct obtains reserves, and accumulation summation is true
Determine gross reserves G, G=F1×A1+F2×A2+F3×A3+……Fn×An。
According to a further aspect of the invention, each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodnSpecifically:
Determine work area range S, gas well is evenly distributed in work area；
Determine total well number N in work area；
Determine that the quantity a for meeting the well of gas-bearing formation is bored in each abundance section；
Determine that each abundance section gas-bearing formation Drilling ratio is a/N；
Measure the gas-bearing area A=S based on gas-bearing formation Drilling ratio × (a/N).
Compared with prior art, the beneficial effects of the present invention are:
The present invention is indefinite for boundary, gas-bearing formation changes tight gas reservoir greatly, proposes accurately reserves and/or gassiness face
Product method for measuring.
Detailed description of the invention
Fig. 1 is certain work area range and finishing drilling well location map of a kind of preferred embodiment according to the present invention.
Fig. 2 is a kind of certain work area gas-bearing formation Profile Correlation figure of preferred embodiment according to the present invention.
Fig. 3 is that a kind of individual well reserves abundance subregion of preferred embodiment according to the present invention and brill meet well number figure.
Fig. 4 is that a kind of effective reserves lower limit of preferred embodiment according to the present invention crosses figure.
Fig. 5 is a kind of reserves measurement table of certain block based on Drilling ratio of preferred embodiment according to the present invention.
Specific embodiment
With reference to the accompanying drawing, preferred forms of the invention, specific implementation here are described by preferred embodiment
Mode is to explain the present invention in detail, should not be construed as limiting the invention, and is not departing from spirit and reality of the invention
In the case where matter range, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Embodiment 1
Referring to attached drawing 1-5, it is preferable that a kind of tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio is provided,
Be characterized in that the following steps are included:
It determines work area area coverage, and the measurement of individual well reserves abundance is carried out to wells whole in work area；
According to individual well reserves abundance Distribution value feature, multiple reserves abundance sections are divided, statistics is in different abundance sections
Drilling hole number；
The Drilling ratio for measuring different abundance sections gas well carries out product with the block gross area, obtains each abundance section
Gas-bearing area；
Reserves abundance is averaged according to gas well in each abundance section and gas-bearing area product obtains reserves, and accumulation summation obtaining work
Area's gross reserves.
Preferably, a kind of tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio is provided, it is characterised in that including
Following steps:
All gas well interval of interest reserves abundance F are measured using volumetric method, determine gas well reserves abundance demarcation interval；
Each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodn, the sum of each section gas-bearing area is equal to work area
Total gas-bearing area A, i.e. A1+A2+A3+A4+ ... An=A；
Determine in each abundance section that gas well is averaged reserves abundance Fn, FnThe sum of gas well abundance/gas well number in=certain abundance section
Amount；
It is averaged reserves abundance F according to gas well in each abundance sectionnWith gas-bearing area AnProduct obtains reserves, and accumulation summation is true
Determine gross reserves G, G=F1×A1+F2×A2+F3×A3+……Fn×An。
Preferably, each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodnSpecifically:
Determine work area range S, gas well is evenly distributed in work area；
Determine total well number N in work area；
Determine that the quantity a for meeting the well of gas-bearing formation is bored in each abundance section；
Determine that each abundance section gas-bearing formation Drilling ratio is a/N；
Measure the gas-bearing area A=S based on gas-bearing formation Drilling ratio × (a/N).
Preferably, it puts into and develops for tight gas, after implementing Part Development well, carry out reserves measurement.
Preferably, in reserves abundance F formula, by taking Sulige gas field, Ordos Basin 36-11 block as an example, payzone is box
8 sections, 1 section of mountain, 3 gas pay sections such as 2 sections of mountain, by measurement, in this area, Psc is ground standard pressure, MPa, value
0.101MPa；Tsc is ground standard temperature, degree Kelvin k, value 293.15K；Pi is gas reservoir original formation pressure, Mpa, value
29Mpa；T is average gas-bearing formation temperature K, value 380k；Zi is original gas deviation factor, zero dimension, value 0.96.Preferably,
Other parameters are obtained by well logging, different because of each well.
Preferably, tight gas reservoir of the invention has the characteristics that " well Unit one, Area of a well are limited ".It is developing
Stage is more than 0.5 mouthful/km when well pattern density2When, gas-bearing area measurement is carried out using gas-bearing formation Drilling ratio method.
Embodiment 2
Referring to Fig. 1-5, it is preferable that by taking certain tight gas reservoir development block as an example (Fig. 1), carry out reserves measurement.According to geology
Data shows that the block has longitudinal gas-bearing formation multilayer development, the distribution characteristics (Fig. 2) of overlapping in flakes, overlaps gas-bearing area
492.8km2, exploration phase submission verifies oil in place 787.85 × 108m3, block is averaged reserves abundance 1.6108m3/km2.It throws
Since entering exploitation, 260 mouthfuls of drilled well number, 0.53 mouthful of well/km of well spacing density2。
Preferably, the tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio that the present invention provides a kind of, feature exist
In the following steps are included:
In step (1), individual well reserves abundance in work area is measured, intension is that gas-bearing area is that (i.e. A is unit area
1km2) when corresponding oil in place, unit 108m3/km2, specific formula is as follows:
Formula Mesosphere thickness, the practical logging of gas saturation, porosity parameter from each well are as a result, other parameters pair
It is general, therefore measurement result of the value from entire gas field for an area.
Parameter meaning in formula, F- reserves abundance, 108m3/km2；H- gas-bearing net pay, m；The effective saturation degree of Φ-gas-bearing formation,
Decimal；The original gas saturation of Sg-, decimal；Tsc- ground standard temperature, k；Pi- gas reservoir original formation pressure, Mpa；Psc-
Face normal pressure, Mpa；T- is averaged gas-bearing formation temperature, K；Zi- original gas deviation factor.
Measurement result shows that work area whole well reserves abundance is distributed in 0.14 × 108m3/km2To 4.11 × 108m3/km2,
It is mainly distributed on 0.8 × 108m3/km2To 2.0 × 108m3/km2, such as 8 reserves abundances can be divided into according to 0.4 interval
Section (Fig. 3).
Specifically, determining work area area 492.8km in step (2)2, add up 260 mouthfuls of drilling well, explain knot according to individual well
Fruit and the lower limits of effective reservoir are analyzed, and are had industrial gas well Production development data in combined area, are determined that single layer effective thickness is greater than
2m, layer reserves abundance is closed greater than 0.4 × 108m3/km2For the lower limit of effective reserves, bore meet the region well be it is effective, can be with
For the well (Fig. 4) of calculated reserves.According to this standard, effective Jing255Kou in area.By effective reserves lower bound analysis, quickly
The wellblock for not having industrial gas deliverability is weeded out, reserves scale is calculated for further subregion and lays the foundation.
Specifically, in step (3), according to reserves abundance interval division as a result, determining each abundance section distribution respectively
Drilling hole number, determine therefrom that the Drilling ratio in each reserves abundance section, i.e., the well number of each section distribution and the ratio of total well number
Value, as coefficient, is further multiplied with the work area gross area, obtains the gas-bearing area An (Fig. 5) in each reserves abundance section.
Specifically, to the well for being distributed in each reserves abundance section, being measured using each well reserves abundance in step (4)
As a result, carry out probability analysis respectively, excluding outlier determines being averaged for gas well in each reserves abundance section on this basis
Reserves abundance Fn(Fig. 5).
Specifically, in step (5), respectively by the average reserves abundance of gas well in each reserves abundance section with it is corresponding
Gas-bearing area carries out product, can be obtained the reserves scale in each reserves abundance section, each section reserves scale from 2.84 ×
108m3To 84.72 × 108m3, wherein abundance section is less than 0.4 × 108m3/km2The reserves gas well yield in section is low, and work is not achieved
The standard of industry air-flow well, therefore this part is invalid reserves, remaining each section reserves summation obtains the effective reserves scale of the block
It is 736.19 × 108m3(referring to Fig. 5, reserves measurement result of certain block based on Drilling ratio).
In conclusion the beneficial effects of the present invention are:
The present invention is indefinite for boundary, gas-bearing formation changes tight gas reservoir greatly, proposes accurately reserves and/or gassiness face
Product method for measuring, to provide foundation for gas field Efficient Development.
The present invention is not limited to above-mentioned specific embodiments.It is understood that not departing from spirit and substance of the present invention model
In the case where enclosing, various changes and modifications can be made, these should all be included within protection scope of the present invention.
Claims (1)
1. a kind of tight gas reservoir reserves measuring method based on gas-bearing formation Drilling ratio, it is characterised in that the following steps are included:
All gas well interval of interest reserves abundance F are measured using volumetric method, determine gas well reserves abundance demarcation interval,
Each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodn, the sum of each section gas-bearing area is equal to work area and always contains
Gas area A, i.e. A1+A2+A3+A4+ ... An=A；
Determine in each abundance section that gas well is averaged reserves abundance Fn, FnThe sum of gas well abundance/gas well quantity in=certain abundance section；
And
It is averaged reserves abundance F according to gas well in each abundance sectionnWith gas-bearing area AnProduct obtains reserves, and accumulation summation determines total
Reserves G, G=F1×A1+F2×A2+F3×A3+……Fn×An；
Wherein, each abundance section gas-bearing area A is measured using gas-bearing formation Drilling ratio methodnIt specifically includes:
Determine work area range S, gas well is evenly distributed in work area；
Determine total well number N in work area；
Determine that the quantity a for meeting the well of gas-bearing formation is bored in each abundance section；
Determine that each abundance section gas-bearing formation Drilling ratio is a/N；
Measure the gas-bearing area A=S based on gas-bearing formation Drilling ratio × (a/N).
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| CN109343145A (en) * | 2018-11-28 | 2019-02-15 | 程立华 | Method is determined based on the Recover of Tight Sandstone Gas Reservoir enrichment region of amendment reserves abundance |
| CN112031757A (en) * | 2020-09-08 | 2020-12-04 | 中国石油天然气股份有限公司 | Method for evaluating encryption potential of tight gas reservoir well pattern |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109343145A (en) * | 2018-11-28 | 2019-02-15 | 程立华 | Method is determined based on the Recover of Tight Sandstone Gas Reservoir enrichment region of amendment reserves abundance |
| CN109343145B (en) * | 2018-11-28 | 2020-04-14 | 程立华 | Low-permeability tight sandstone gas reservoir enrichment area determination method based on corrected reserve abundance |
| CN112031757A (en) * | 2020-09-08 | 2020-12-04 | 中国石油天然气股份有限公司 | Method for evaluating encryption potential of tight gas reservoir well pattern |
| CN112031757B (en) * | 2020-09-08 | 2023-07-25 | 中国石油天然气股份有限公司 | Method for evaluating encryption potential of tight gas reservoir well pattern |
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