CN111827969B - Shale gas reserves calculating method, equipment and readable storage medium - Google Patents
Shale gas reserves calculating method, equipment and readable storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011148 porous material Substances 0.000 claims abstract description 58
- 238000004364 calculation method Methods 0.000 claims abstract description 33
- 239000006104 solid solution Substances 0.000 claims abstract description 33
- 238000001179 sorption measurement Methods 0.000 claims abstract description 15
- 238000005481 NMR spectroscopy Methods 0.000 claims abstract description 13
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 238000002474 experimental method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000002734 clay mineral Substances 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 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 98
- 238000012545 processing Methods 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 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
- 238000005498 polishing Methods 0.000 description 2
- 230000008569 process Effects 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
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 230000006870 function Effects 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
- 239000005416 organic matter Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 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 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention discloses a shale gas reserves calculating method, which comprises the following steps: acquiring a T2 spectrum obtained after performing nuclear magnetic resonance experiments on shale samples obtained after shale reservoir sampling; according to the obtained T2 spectrum, obtaining 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 the solid solution gas quantity of the shale reservoir according to the area, the effective thickness, the density and the pore radius of the shale reservoir, wherein the ratio of the pore space volume of the first pore diameter to the total pore volume; and obtaining 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 beneficial effects of the invention are as follows: the solid solution gas storage volume of the shale reservoir is obtained through the nuclear magnetic resonance method, and then the solid solution gas volume of the shale reservoir is obtained, and the solid solution gas volume is added into the shale gas reservoir of the shale reservoir on the basis of the existing static reservoir calculation method, so that the accuracy of shale gas reservoir 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 reserves calculating method, shale gas reserves calculating equipment and a readable storage medium.
Background
Previous studies have considered that the gas in shale reservoirs exists in three forms of adsorbed, free and dissolved states on the solid surfaces of the reservoir organic matter, pores and inside the fluids in the reservoir. The specific reservoir space is based on the organic holes, inorganic mineral inter-particle holes, etching holes, inter-crystal holes and the like identified by the argon ion polishing and field emission scanning electron microscope.
However, the argon ion polishing, field emission scanning electron microscopy and field emission transmission electron microscopy technology discovers that a large number of intermolecular and inter-crystalline voids exist in the solid particles of shale, so that methane molecules can be allowed to flow and flow in the voids, and the gas existing in the internal space of the solid mineral particles is called solid solution gas, namely, the gas molecules and the solid molecules exist in a mutual dissolving mode, and the occurrence mechanics mechanism of the gas molecules is different from that of the gas in an adsorption state, a free state and a dissolved state. Transmission electron microscope observation proves that only clay minerals in the shale reservoir have solid solution gas occurrence spaces, the pore radius of the space is 0.4-4nm, and the key point of calculating the solid solution gas content is to obtain the volume of the space.
The existing shale gas reserves calculating method based on the static reserves calculating method only considers the adsorbed state and the free state gas, but does not consider the content of solid solution gas, so that shale gas reserves calculating results are often lower.
Disclosure of Invention
In view of this, it is necessary to provide a shale gas reserves calculation method that takes into account the content of solid solution gas, thereby improving the accuracy of shale gas reserves calculation.
In a first aspect, the invention provides a shale gas reserves calculation method, comprising the following steps:
acquiring the area, effective thickness, density, porosity, adsorption gas quantity and free gas quantity of a shale reservoir;
obtaining a T2 spectrum obtained after performing nuclear magnetic resonance experiments on shale samples obtained after sampling the shale reservoir;
according to the obtained T2 spectrum, obtaining pore radius distribution of a shale sample, 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 clay minerals in the shale sample;
obtaining the solid solution gas quantity of the shale reservoir according to the area, the effective thickness, the density and the pore radius of the shale reservoir, wherein the ratio of the pore space volume of the first pore diameter to the total pore volume;
and obtaining 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 invention also provides shale gas reserves computing equipment, which comprises a processor and a memory; the memory has stored thereon a computer readable program executable by the processor; the steps in the shale gas reserves calculating method provided by the invention are realized when the processor executes the computer readable program.
In a third aspect, the present invention also provides a computer readable storage medium storing one or more programs executable by one or more processors to implement 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 the nuclear magnetic resonance method, and then the solid solution gas amount of the shale reservoir is obtained, and the solid solution gas amount of the shale reservoir is added into the shale gas reservoir of the shale reservoir on the basis of the existing static reservoir calculation method, so that the accuracy of the shale gas reservoir calculation is greatly improved.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a shale gas reserves calculation method provided by the invention;
FIG. 2 is a schematic flow chart of the method of performing nuclear magnetic resonance experiments on shale samples in step S2 of FIG. 1;
FIG. 3 is a graph of the pore radius distribution of the T2 spectrum (a) obtained after nuclear magnetic resonance experiments of shale samples and transformed shale samples (b);
FIG. 4 is a schematic view of the operating environment of a preferred embodiment of the shale gas reserves calculation method program of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a shale gas reserves calculating method, which comprises the following steps (see figure 1):
s1, acquiring the area, effective thickness, density, porosity, adsorption gas quantity and free gas quantity of a 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 logging data.
The adsorption gas quantity of the shale reservoir can be measured by an isothermal adsorption method, and can be measured by referring to the standard DZ/T0254-2014 (shale gas resource/reserve calculation and evaluation technical specification, https:// www.docin.com/p-873176556. Htmlqq-pf-to=pcqq.c2c) of geological mineral products of the people's republic, which is the prior art and is not repeated. The calculation formula of the adsorption gas amount of the shale reservoir is as follows:
G x ＝0.01A g hρ y C x /Z i
wherein ,Gx Adsorbed gas volume for shale reservoirs, 10 8 m 3 ；A g Is the area of shale reservoir, km 2 The method comprises the steps of carrying out a first treatment on the surface of the h is the effective thickness of the shale reservoir, m; ρ y Is the density of shale reservoir, g/cm 3 ；C x Adsorption of gas content, m, for shale reservoirs 3 /t；Z i Is the original gas deviation coefficient in shale reservoirs.
The free gas amount 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. Htmlqq-pf-to=pcqq.c2c), which is the prior art and is not repeated. The calculation formula of the free gas amount of the shale reservoir is as follows:
wherein ,Gy Free gas content for shale reservoir, 10 8 m 3 ；A g Is the area of shale reservoir, km 2 The method comprises the steps of carrying out a first treatment on the surface of the h is the effective thickness of the shale reservoir, m;
porosity of shale reservoir,%; s is S gi Gas saturation of shale reservoir,%; b (B) gi Is the original shale gas volumetric coefficient of the shale reservoir.
S2, obtaining a T2 spectrum obtained after performing nuclear magnetic resonance experiments on shale samples obtained after the shale reservoir is sampled. The T2 spectrum (T2 spectrum) is a time constant describing the process of recovery of the transverse component of the nuclear magnetization and is therefore called transverse relaxation time. The transverse relaxation process is caused by the exchange energy inside the nuclear spin system, so is also called spin-spin relaxation time, which will be the result of contributions from multiple components with different relaxation times due to the complexity of the rock pore structure and the diversity of the pore fluids and their occurrence. Can be represented by a multi-exponential function: when the formation is saturated with water and the echo interval is relatively small, the T2 spectrum corresponds well to the distribution of rock pore sizes. In this embodiment, shale reservoir sampling may adopt means such as drilling coring, side-wall coring, etc. to obtain a shale sample at a target interval, and the longitudinal sampling density is 5-10 meters/sample, referring to fig. 2, the method for performing 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, wherein in the embodiment, the preset temperature is 110 ℃, and vacuumizing the shale sample at the temperature of 110 ℃ for 12 hours to remove the moisture and volatile substances in the shale sample.
S22, adding water into the shale sample after the degassing treatment so as to fully saturate the shale sample with water.
S23, performing nuclear magnetic resonance testing on the shale sample with the fully saturated water through a nuclear magnetic resonance instrument.
S3, obtaining pore radius distribution of the shale sample according to the obtained T2 spectrum, and obtaining the ratio of the pore space volume with the pore radius of the first pore diameter to the total pore volume
(refer to FIG. 3), wherein the first pore diameter is the pore radius of clay mineral in shale sample, the first pore diameter is 0.4-4nm, and the solid solution gas occurrence volume is the reservoir volume and +.>
I.e. the occurrence volume of solid solution gas:
wherein ,Vc ＝0.01A g h，V g The volume of solid solution gas is V c For the volume of the reservoir,
a is the proportion of the volume of pore space with the pore radius of 0.4-4nm to the total pore volume in the shale sample g And h is the effective thickness of the shale reservoir.
S4, obtaining the solid solution gas quantity of the shale reservoir according to the ratio of the pore space volume with the first pore diameter to the total pore volume of the shale reservoir. The calculation formula of the solid solution gas amount of the shale reservoir is as follows:
wherein ,Gg Solid solution gas amount of shale reservoir, 10 8 m 3 ；A g Is the area of shale reservoir, km 2 The method comprises the steps of carrying out a first treatment on the surface of the h is the effective thickness of the shale reservoir, m;
the ratio of the volume of the pore space with the pore radius of 0.4-4nm to the total pore volume in the shale sample is percent; s is S gi Gas saturation of shale reservoir,%; b (B) gi Is the original shale gas volumetric coefficient of the shale reservoir. Gas saturation S of shale reservoirs gi The raw shale gas volume coefficient B of the shale reservoir can be obtained through logging data gi The calculation can be performed by the following formula:
wherein ,Zi The method is characterized in that the method is used for obtaining an original gas deviation coefficient in a shale reservoir, T is the temperature of the shale reservoir, and p is the pressure of the shale reservoir.
S5, obtaining 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 shale gas reserves of the shale reservoir is as follows:
G z ＝G x +G y +G g
wherein ,Gz G is shale gas reserves of shale reservoirs x Adsorption gas amount for shale reservoir, G y Free gas amount of shale reservoir, G g Is the solid solution gas amount of 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, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders.
As shown in fig. 4, based on the shale gas reserves calculating method, the invention further provides shale gas reserves calculating equipment, and the shale gas reserves calculating equipment can be mobile terminals, desktop computers, notebooks, palm computers, servers and other calculating equipment. The shale gas reserves computing device includes a processor 10, a memory 20, and a display 30. Fig. 4 shows only a portion of the components of the shale gas reserves computing apparatus, but it should be understood that not all of the illustrated components are required to be implemented, and more or fewer components may alternatively be implemented.
The memory 20 may in some embodiments be an internal storage unit of the shale gas reserves computing device, such as a hard disk or memory of the shale gas reserves computing device. The memory 20 may also be an external storage device of the shale gas reserves computing device in other embodiments, such as a plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card) or the like, which is provided on the shale gas reserves computing device. Further, the memory 20 may also include both internal and external storage units of shale gas reserves computing equipment. The memory 20 is used for storing application software and various data installed in the shale gas reserves calculation, such as program codes for installing shale gas reserves calculation, and the like. The memory 20 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 20 has stored thereon a shale gas reserves calculation program 40, the shale gas reserves calculation program 40 being executable by the processor 10 to implement the shale gas reserves calculation method of the various embodiments of the present application.
The processor 10 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 20, such as performing the shale gas reserves calculation method or the like.
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, or the like in some embodiments. The display 30 is used to display information calculated at the shale gas reserves and to display a visual user interface. The components 10-30 of the shale gas reserves computing device communicate with each other via a system bus.
In an embodiment, the steps in the shale gas reserves calculating method according to the above embodiment are implemented when the processor 10 executes the shale gas reserves calculating program 40 in the memory 20, and the shale gas reserves calculating method is described in detail above and will not be described herein.
In summary, the solid solution gas storage volume of the shale reservoir is obtained through the nuclear magnetic resonance method, and then the solid solution gas volume of the shale reservoir is obtained, and the solid solution gas volume of the shale reservoir is added into the shale gas reservoir of the shale reservoir on the basis of the existing static reservoir calculation method, so that the accuracy of the shale gas reservoir calculation is greatly improved.
Of course, those skilled in the art will appreciate that implementing all or part of the above-described methods may be implemented by a computer program for instructing relevant hardware (e.g., a processor, a controller, etc.), where the program may be stored in a computer-readable storage medium, and where the program may include the steps of the above-described method embodiments when executed. The storage medium may be a memory, a magnetic disk, an optical disk, or the like.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (9)
1. The shale gas reserves calculating method is characterized by comprising the following steps of:
acquiring the area, effective thickness, density, porosity, adsorption gas quantity and free gas quantity of a shale reservoir;
obtaining a T2 spectrum obtained after performing nuclear magnetic resonance experiments on shale samples obtained after sampling the shale reservoir;
according to the obtained T2 spectrum, obtaining pore radius distribution of a shale sample, 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 clay minerals in the shale sample;
the solid solution gas amount of the shale reservoir is obtained according to the area, the effective thickness, the density and the ratio of the pore space volume with the pore radius of the first pore diameter to the total pore volume, wherein the solid solution gas is gas existing in the internal space of the solid mineral particles, and the calculation formula of the solid solution gas amount of the shale reservoir is as follows:
wherein ,
for the solid solution gas volume of shale reservoir +.>
For shale reservoir area +.>
For the effective thickness of shale reservoir +.>
For the ratio of pore space volume to total pore volume of shale samples with pore radius of 0.4-4nm, +.>
Is the gas saturation of shale reservoir, +.>
The original shale gas volumetric coefficient of the shale reservoir;
and obtaining 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 from 0.4 to 4 nm.
3. The shale gas reserves calculation method of claim 1, wherein in the step of obtaining the T2 spectrum obtained after performing the nuclear magnetic resonance experiment on the shale sample obtained after sampling the shale reservoir, the method for performing the nuclear magnetic resonance experiment on the shale sample includes 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;
nuclear magnetic resonance testing was performed on a shale sample of fully saturated water by nuclear magnetic resonance.
4. The shale gas reserves calculation method of claim 3, wherein the predetermined temperature is 110 ℃.
5. The shale gas reserves 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 calculation formula of the adsorbed gas amount of the shale reservoir is:
wherein ,
adsorption gas amount for shale reservoir +.>
For shale reservoir area +.>
For the effective thickness of shale reservoir +.>
For the density of shale reservoirs, +.>
Adsorbing gas content for shale reservoirs, +.>
Is the original gas deviation coefficient in shale reservoirs.
6. The shale gas reserves 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 calculation formula of the free gas amount of the shale reservoir is:
wherein ,
free gas for shale reservoir +.>
For shale reservoir area +.>
For the effective thickness of shale reservoir +.>
Porosity of shale reservoir +.>
Is the gas saturation of shale reservoir, +.>
Is the original shale gas volumetric coefficient of the shale reservoir.
7. The shale gas reserves calculation method of claim 1, wherein in the step of obtaining the shale gas reserves of the shale reservoir from the adsorbed gas amount, the free gas amount, and the solid solution gas amount of the shale reservoir, the shale gas reserves of the shale reservoir are calculated by the following formula:
wherein ,
shale gas reserves for shale reservoirs, +.>
Adsorption gas amount for shale reservoir +.>
Free gas for shale reservoir +.>
Is the solid solution gas amount of shale reservoir.
8. A shale gas reserves computing device 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 as claimed in any of claims 1-7.
9. A computer readable storage medium storing one or more programs executable by one or more processors to perform the steps in the shale gas reserves calculation method of any of claims 1-7.
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