CN111827969A - Shale gas reserve calculation method and device and readable storage medium - Google Patents
Shale gas reserve calculation method and device and readable storage medium Download PDFInfo
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- 238000004364 calculation method Methods 0.000 title claims abstract description 48
- 239000011148 porous material Substances 0.000 claims abstract description 68
- 239000006104 solid solution Substances 0.000 claims abstract description 30
- 238000001179 sorption measurement Methods 0.000 claims abstract description 13
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000002474 experimental method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002734 clay mineral Substances 0.000 claims description 4
- 238000012565 NMR experiment Methods 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 abstract description 4
- 238000001225 nuclear magnetic resonance method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 95
- 230000008569 process Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The invention discloses a shale gas reserve calculation method, which comprises the following steps: obtaining a T2 spectrum obtained by performing a nuclear magnetic resonance experiment on a shale sample obtained after sampling a shale reservoir; according to the obtained T2 spectrum, obtaining the pore radius distribution of the shale sample, and obtaining the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume; obtaining solid solution gas volume of the shale reservoir according to the area, effective thickness and density of the shale reservoir and the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume; and obtaining the shale gas reserves of the shale reservoir according to the adsorption gas quantity, the free gas quantity and the solid solution gas quantity of the shale reservoir. The invention has the beneficial effects that: the solid solution gas occurrence volume of the shale reservoir is obtained through a nuclear magnetic resonance method, the solid solution gas quantity of the shale reservoir is further obtained, and the solid solution gas quantity is added into the shale gas reserves of the shale reservoir on the basis of the conventional static reserve calculation method, so that the accuracy of shale gas reserve calculation is greatly improved.
Description
Technical Field
The invention relates to the technical field of shale gas exploration and development, in particular to a shale gas reserve calculation method, shale gas reserve calculation equipment and a readable storage medium.
Background
The previous researches suggest that gas in the shale reservoir exists on solid surfaces such as organic matters of the reservoir and the like, pores and inside fluid in the reservoir in three forms of adsorption state, free state and dissolved state. The specific reservoir space is an organic pore, an inorganic mineral inter-granular pore, an erosion pore, an inter-granular pore and the like identified based on argon ion polishing and field emission scanning electron microscope.
However, through argon ion polishing, field emission scanning electron microscopy and field emission transmission electron microscopy, it is found that a large number of intermolecular and intercrystalline pores exist inside solid particles of shale, which can allow methane molecules to exist and flow therein, and this gas existing in the internal space of the solid mineral particles is called solid dissolved gas, i.e. gas molecules and solid molecules exist in a mutual soluble manner, and the existing mechanical mechanism is different from that of adsorption state, free state and dissolved state gas. Transmission electron microscope observation proves that only clay minerals in the shale reservoir have solid solution gas occurrence space, the pore radius of the space is 0.4-4nm, and the key point for calculating the solid solution gas content is to obtain the volume of the space.
The existing shale gas reserves calculation method based on the static reserves calculation method only considers the gas in an adsorption state and a free state, but does not consider the content of solid dissolved gas, so that the shale gas reserves calculation result is often lower.
Disclosure of Invention
In view of the above, it is necessary to provide a shale gas reserves calculation method that takes into account the content of the solid solution gas and thus improves the accuracy of shale gas reserves calculation.
In a first aspect, the invention provides a shale gas reserves calculation method, which comprises the following steps:
obtaining the area, effective thickness, density, porosity, adsorbed gas amount and free gas amount of a shale reservoir;
obtaining a T2 spectrum obtained after performing a nuclear magnetic resonance experiment on a shale sample obtained after sampling the shale reservoir;
obtaining the pore radius distribution of the shale sample according to the obtained T2 spectrum, and obtaining the proportion of the pore space volume with the pore radius of a first pore diameter to the total pore volume, wherein the first pore diameter is the pore radius of the clay mineral in the shale sample;
obtaining solid solution gas volume of the shale reservoir according to the area, effective thickness and density of the shale reservoir and the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume;
and obtaining the shale gas reserves of the shale reservoir according to the adsorption gas quantity, the free gas quantity and the solid solution gas quantity of the shale reservoir.
In a second aspect, the present invention further provides a shale gas reserves calculating apparatus, including a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the processor executes the computer readable program to realize the steps of the shale gas reserves calculation method provided by the invention.
In a third aspect, the present invention also provides a computer readable storage medium storing one or more programs, which are executable by one or more processors to implement the steps in the shale gas reserves calculation method provided by the present invention.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: the solid solution gas occurrence volume of the shale reservoir is obtained through a nuclear magnetic resonance method, the solid solution gas quantity of the shale reservoir is further obtained, and the solid solution gas quantity of the shale reservoir is added into the shale gas reserves of the shale reservoir on the basis of the conventional static reserve calculation method, so that the shale gas reserve calculation accuracy is greatly improved.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a shale gas reserves calculation method provided by the present invention;
FIG. 2 is a schematic flow chart of a method for performing an NMR experiment on a shale sample in step S2 of FIG. 1;
FIG. 3 is a graph (a) of the T2 spectrum obtained after NMR analysis of a shale sample and a pore radius distribution (b) of the shale sample obtained by transformation;
fig. 4 is a schematic operating environment diagram of a shale gas reserves calculation method according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a shale gas reserve calculation method, which comprises the following steps (shown in figure 1):
and S1, acquiring the area, effective thickness, density, porosity, adsorbed gas amount and free gas amount of the shale reservoir. The area and the effective thickness of the shale reservoir can be obtained through seismic data and logging data, and the density and the porosity of the shale reservoir can be obtained through the logging data.
The adsorption capacity of the shale reservoir can be measured by an isothermal adsorption method, and the adsorption capacity of the shale reservoir can be measured by referring to the geological mineral industry standard DZ/T0254-2014 (shale gas resource/reserve calculation and evaluation technical specification, https:// www.docin.com/p-873176556. html. The calculation formula of the adsorption gas quantity of the shale reservoir is as follows:
Gx＝0.01AghρyCx/Zi
wherein ,GxAdsorbed gas volume for shale reservoirs, 108m3；AgArea of shale reservoir, km2(ii) a h is the effective thickness of the shale reservoir, m; rhoyDensity of shale reservoir, g/cm3；CxAdsorption of gas content, m, for shale reservoirs3/t；ZiThe deviation coefficient of the original gas in the shale reservoir.
The free gas volume of the shale reservoir can be determined by referring to the geological mineral industry standard DZ/T0254-2014 (shale gas resource/reserve calculation and evaluation technical specification, https:// www.docin.com/p-873176556. html. The free gas volume of the shale reservoir is calculated according to the formula:
wherein ,GyFree gas volume for shale reservoirs, 108m3；AgArea of shale reservoir, km2(ii) a h is the effective thickness of the shale reservoir, m;
porosity of shale reservoir,%; sgiGas saturation of shale reservoir,%; b isgiThe original shale gas volume coefficient of the shale reservoir.
And S2, obtaining a T2 spectrum obtained by performing a nuclear magnetic resonance experiment on the shale sample obtained after the shale reservoir is sampled. The T2 spectrum (T2 spectrum) is the time constant describing the process of recovery of the transverse component of nuclear magnetization and is therefore called the transverse relaxation time. The transverse relaxation process is caused by the exchange of energy inside the nuclear spin system, so called spin-spin relaxation time, and due to the complexity of the rock pore structure and the diversity of pore fluids and their occurrence states, the relaxation process will be the result of multiple component contributions with different relaxation times. Can be expressed by a multi-exponential function: when the formation is saturated with water and the echo spacing is relatively small, the T2 spectrum corresponds well to the distribution of rock pore sizes. In this embodiment, the shale reservoir sampling may be performed by drilling coring, sidewall coring, and the like to obtain a shale sample of a target interval, and the longitudinal sampling density is 5 to 10 meters per sample, referring to fig. 2, the method for performing the nuclear magnetic resonance experiment on the shale sample includes the following steps:
s21, degassing the shale sample at a preset temperature to remove moisture and volatile substances in the shale sample, in this embodiment, the preset temperature is 110 ℃, and the shale sample is subjected to a vacuum pumping treatment at 110 ℃ for 12 hours to remove moisture and volatile substances in the shale sample.
And S22, adding water into the shale sample after degassing treatment so as to completely saturate the shale sample with water.
And S23, performing the nuclear magnetic resonance test on the shale sample which is completely saturated with water through the nuclear magnetic resonance instrument.
S3, obtaining the pore radius distribution of the shale sample according to the obtained T2 spectrum, and obtaining the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume
(please refer to fig. 3), wherein the first pore diameter is the pore radius of the clay mineral in the shale sample, the first pore diameter is 0.4-4nm, and the solid solution gas occurrence volume is the reservoir volume and
the product of (a), i.e., the occurrence volume of the solid solution gas:
wherein ,Vc＝0.01Agh，VgThe occurrence volume of dissolved gas, VcIs the volume of the reservoir(s),
the ratio of the pore space volume with the pore radius of 0.4-4nm in the shale sample to the total pore volume is AgIs the area of the shale reservoir and h is the effective thickness of the shale reservoir.
And S4, obtaining the solid solution gas volume of the shale reservoir according to the area, the effective thickness and the density of the shale reservoir and the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume. The calculation formula of the solid solution gas volume of the shale reservoir is as follows:
wherein ,GgAmount of solid solution gas for shale reservoir, 108m3；AgArea of shale reservoir, km2(ii) a h is the effective thickness of the shale reservoir, m;
the proportion of the volume of the pore space with the pore radius of 0.4-4nm in the shale sample to the total pore volume is percent; sgiGas saturation of shale reservoir,%; b isgiThe original shale gas volume coefficient of the shale reservoir. Gas saturation S of shale reservoirgiThe original shale gas volume coefficient B of the shale reservoir can be obtained through logging informationgiCan be calculated by the following formula:
wherein ,ZiThe deviation coefficient of the original gas in the shale reservoir is shown, T is the temperature of the shale reservoir, and p is the pressure of the shale reservoir.
And S5, obtaining the shale gas reserves of the shale reservoir according to the adsorption gas quantity, the free gas quantity and the solid solution gas quantity of the shale reservoir. The calculation formula of the shale gas reserves of the shale reservoir is as follows:
Gz＝Gx+Gy+Gg
wherein ,GzShale gas reserves, G, for shale reservoirsxAdsorbed gas volume for shale reservoir, GyFree gas volume, G, for shale reservoirsgThe solid solution gas volume of the shale reservoir.
It should be understood that although the steps in the flowcharts of fig. 1 and 2 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
As shown in fig. 4, based on the shale gas reserves calculating method, the invention also provides a shale gas reserves calculating device, which may be a mobile terminal, a desktop computer, a notebook, a palm computer, a server and other calculating devices. The shale gas reserves calculating apparatus includes a processor 10, a memory 20, and a display 30. Fig. 4 shows only some of the components of the shale gas reserves calculation apparatus, but it is to be understood that not all of the shown components are required and that more or fewer components may alternatively be implemented.
The memory 20 may be an internal storage unit of the shale gas reserves calculating device in some embodiments, such as a hard disk or a memory of the shale gas reserves calculating device. The memory 20 may also be an external storage device of the shale gas reserves calculating device in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a flash Card (FlashCard), and the like equipped on the shale gas reserves calculating device. Further, the memory 20 may also include both an internal storage unit of the shale gas reserves calculation apparatus and an external storage apparatus. The memory 20 is used for storing application software installed in the shale gas reserves calculation and various types of data, such as program codes of the installation shale gas reserves calculation. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a shale gas reserves calculation program 40, and the shale gas reserves calculation program 40 can be executed by the processor 10, so as to implement the shale gas reserves calculation method according to the embodiments of the present application.
The processor 10 may be, in some embodiments, a Central Processing Unit (CPU), a microprocessor or other data Processing chip, and is configured to execute program codes stored in the memory 20 or process data, such as executing the shale gas reserves calculation method.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used to display information calculated from the shale gas reserves and to display a visual user interface. The components 10-30 of the shale gas reserves calculation apparatus communicate with each other over a system bus.
In an embodiment, when the processor 10 executes the shale gas reserves calculation program 40 in the memory 20, the steps in the shale gas reserves calculation method according to the above embodiment are implemented, and since the shale gas reserves calculation method has been described in detail above, no further description is given here.
In conclusion, the solid solution gas occurrence volume of the shale reservoir and the solid solution gas quantity of the shale reservoir are obtained through the nuclear magnetic resonance method, and the solid solution gas quantity of the shale reservoir is added into the shale gas reserve of the shale reservoir on the basis of the conventional static reserve calculation method, so that the accuracy of shale gas reserve calculation is greatly improved.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A shale gas reserves calculation method is characterized by comprising the following steps:
obtaining the area, effective thickness, density, porosity, adsorbed gas amount and free gas amount of a shale reservoir;
obtaining a T2 spectrum obtained after performing a nuclear magnetic resonance experiment on a shale sample obtained after sampling the shale reservoir;
obtaining the pore radius distribution of the shale sample according to the obtained T2 spectrum, and obtaining the proportion of the pore space volume with the pore radius of a first pore diameter to the total pore volume, wherein the first pore diameter is the pore radius of the clay mineral in the shale sample;
obtaining solid solution gas volume of the shale reservoir according to the area, effective thickness and density of the shale reservoir and the proportion of the pore space volume with the pore radius of the first pore diameter to the total pore volume;
and obtaining the shale gas reserves of the shale reservoir according to the adsorption gas quantity, the free gas quantity and the solid solution gas quantity of the shale reservoir.
2. The shale gas reserves calculation method of claim 1, wherein the first pore size is between 0.4 nm and 4 nm.
3. The shale gas reserves calculation method of claim 1, wherein in the step of obtaining a T2 spectrum obtained after performing a nmr experiment on the shale samples obtained after sampling the shale reservoir, the method of performing the nmr experiment on the shale samples comprises the steps of:
degassing the shale sample at a preset temperature to remove moisture and volatile substances in the shale sample;
adding water to the degassed shale sample to fully saturate the shale sample with water;
the shale samples of fully saturated water were subjected to nmr testing by nmr.
4. The shale gas reserves calculation method of claim 3, wherein the predetermined temperature is 110 ℃.
5. The shale gas reserve calculation method of claim 2, wherein in the step of obtaining the solid solution gas volume of the shale reservoir according to the area, the effective thickness, the density and the proportion of the volume of the pore space with the pore radius of the first pore diameter to the total pore volume, the solid solution gas volume of the shale reservoir is calculated according to the following formula:
wherein ,GgIs the solid solution gas volume of the shale reservoir, AgIs the area of the shale reservoir, h is the effective thickness of the shale reservoir,
the ratio of the volume of the pore space with the pore radius of 0.4-4nm in the shale sample to the total pore volume, SgiGas saturation for shale reservoirs, BgiThe original shale gas volume coefficient of the shale reservoir.
6. The shale gas reserve calculation method of claim 1, wherein in the step of obtaining the area, the effective thickness, the density, the porosity, the amount of adsorbed gas and the amount of free gas of the shale reservoir, the calculation formula of the amount of adsorbed gas of the shale reservoir is:
Gx＝0.01AghρyCx/Zi
wherein ,GxAdsorbed gas volume for shale reservoirs, AgIs the area of the shale reservoir, h is the effective thickness of the shale reservoir, ρyIs the density of shale reservoir, CxAdsorption of gas content, Z, for shale reservoirsiThe deviation coefficient of the original gas in the shale reservoir.
7. The shale gas reserve calculation method of claim 1, wherein in the step of obtaining the area, the effective thickness, the density, the porosity, the adsorbed gas amount and the free gas amount of the shale reservoir, the free gas amount of the shale reservoir is calculated according to the following formula:
wherein ,GyFree gas volume of shale reservoir, AgIs the area of the shale reservoir, h is the effective thickness of the shale reservoir,
for shale storagePorosity of the layer, SgiGas saturation for shale reservoirs, BgiThe original shale gas volume coefficient of the shale reservoir.
8. The shale gas reserve calculation method of claim 1, wherein in the step of obtaining the shale gas reserve of the shale reservoir according to the adsorbed gas amount, the free gas amount and the solid solution gas amount of the shale reservoir, the calculation formula of the shale gas reserve of the shale reservoir is as follows:
Gz＝Gx+Gy+Gg
wherein ,GzShale gas reserves, G, for shale reservoirsxAdsorbed gas volume for shale reservoir, GyFree gas volume, G, for shale reservoirsgThe solid solution gas volume of the shale reservoir.
9. A shale gas reserves calculating apparatus comprising a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps in the shale gas reserves calculation method of any of claims 1-8.
10. A computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to perform the steps of the shale gas reserves calculation method of any one of claims 1-8.
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