CN110821484A - Calculation method and storage medium for geological reserve of continental facies matrix type shale oil - Google Patents
Calculation method and storage medium for geological reserve of continental facies matrix type shale oil Download PDFInfo
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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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- 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
Abstract
The invention relates to a method for calculating geological reserves of continental facies matrix shale oil and a storage medium, comprising the following steps: taking a sweet spot area of a continental facies matrix type shale interval as a basic unit, and dividing a reserve calculation unit according to the drilling control degree, the construction spread and the fracturing measure modification technology which can be implemented by the shale sweet spot interval; determining calculation parameters of continental facies matrix type shale oil geological reserves according to recorded data by relying on earthquake, well logging, core, testing and core analysis assay recorded data; and obtaining the continental facies matrix type shale oil geological reserves of the reserve calculation unit through the values of the calculation parameters of the continental facies matrix type shale oil geological reserves and the deduced shale oil geological reserves calculation formula. And to a storage medium. The invention establishes a geological reserve calculation method which is suitable for the initial stage of continental facies matrix type shale oil exploration and has operability, provides reference for the research and the perfection of the geological reserve calculation method of the continental facies matrix type shale oil in China, and can guide the development and the planning of the shale oil exploration.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and development, in particular to a method for calculating geological reserves of continental facies matrix type shale oil and a storage medium.
Background
In recent years, shale oil as an unconventional oil-gas resource gradually replaces the conventional oil-gas resource to become a main battlefield for exploration and development, and the development of shale oil geological reserve calculation method research has very important significance. Experts consider that shale oil is classified into a matrix type and an interlayer type (according to zhoucai, 2018; zhangjinchuan, 2012) according to occurrence characteristics and development conditions, wherein the matrix type is shale oil which occurs in organic matters, clay mineral microporosities and cracks in a shale matrix, and the interlayer type is shale oil which occurs in siltstones, fine sandstones, carbonates and volcanics in the shale interlayer through extremely short distance migration. The continental facies matrix type shale oil is petroleum which is not subjected to migration and is retained in situ to be reserved, is mainly generated in a shale layer in a free state, an adsorption state and a dissolution state, the shale is a hydrocarbon source rock and a reservoir layer, the reservoir layer is mainly nano-scale pore throats (50 nm-300 nm) and cracks (2018; Chenopodium 2017) according to Zhao Wenzhi, the shale oil obtained by drilling and fracturing mining at present is mainly hydrocarbons in the free state, the research of a shale oil calculation method is late, and no better method for evaluating and calculating the geological reserves of the continental facies matrix type shale oil exists at present.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for calculating geological reserves of continental facies matrix shale oil and a storage medium.
The invention aims to provide a calculation method of the geological reserve of the continental facies matrix type shale oil, which is based on the geological characteristics of the continental facies matrix type shale oil and from the exploration and development practice of the continental facies matrix type shale oil, fully considers the influence of various parameters on the calculation of the geological reserve of the continental facies matrix type shale oil, further determines the parameters and establishes a reserve calculation formula, and finally forms the calculation method for determining the geological reserve of the continental facies matrix type shale oil.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method of calculating geologic reserves of continental facies-matrix shale oil, the method comprising the steps of:
taking a sweet spot area of a continental facies matrix type shale interval as a basic unit, and dividing a reserve calculation unit according to the drilling control degree, the construction spread and the fracturing measure modification technology which can be implemented by the shale sweet spot interval;
determining the value of the calculation parameter of the continental facies matrix type shale oil geological reserve according to the recorded data by relying on the recorded data of earthquake, well logging, rock core, test and rock core analysis and assay;
and obtaining the land-based shale oil geological reserve of the reserve calculation unit according to the value of the calculation parameter of the land-based shale oil geological reserve and a shale oil geological reserve calculation formula.
The invention has the beneficial effects that: by combining the occurrence form and the mining mechanism of the continental facies matrix type shale oil, establishing a unit division standard and matrix type shale oil reserve calculation parameters obtained by research by utilizing data such as earthquake, well logging, testing and core analysis and assay, establishing a geological reserve calculation method which is suitable for the initial stage of the continental facies matrix type shale oil exploration and has operability, providing reference for the research and the perfection of the continental facies matrix type shale oil geological reserve calculation method in China and guiding the development and planning of the shale oil exploration.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the dividing of the reserve calculation unit by using the sweet spot area of the continental facies matrix type shale interval as a basic unit according to the drilling control degree, the construction and development and the fracturing measure modification technology which can be implemented by the shale interval specifically comprises the following steps:
dividing a transverse plane reserve calculation unit by taking a sweet spot area of a continental facies matrix type shale interval as a basic unit according to well drilling control degree, structure spread and fracturing measure modification technology coverage;
and dividing the longitudinal section reserve calculation unit according to the maximum reachable thickness of the measure reconstruction technology.
Further, the calculation parameters of the continental facies matrix type shale oil reserves comprise oil-bearing area, effective thickness, free hydrocarbon oil content, surface crude oil density and original crude oil volume coefficient.
Further, determining an oil-containing boundary according to the recorded data, the dessert distribution of the continental facies matrix type shale and a detection and evaluation well, a production well spacing or a semi-extrapolation of well spacing to obtain the oil-containing area.
Further, the effective thickness of the land-based shale oil interval is determined through a density curve, a resistance curve, a gamma curve, lithology, electrical property, physical property, oil-bearing property interrelation, brittleness, horizontal crustal stress anisotropy and hydrocarbon source rock characteristics in logging information.
Further, according to experimental analysis and logging response characteristics, a logging interpretation model is established, and the oil content of the free hydrocarbon is determined.
And further, determining the ground crude oil density according to the shale oil test and test result of the research area of the continental facies matrix type shale interval.
Further, the volume coefficient of the original crude oil is obtained through high-pressure physical property sampling analysis, or is obtained through the relation between the volume coefficient of a research area and the density of the ground crude oil.
Further, the method for obtaining the geological reserves of the land-based shale oil of each reserve calculation unit according to the calculation parameters of the reserves of the land-based shale oil comprises the following steps:
the oil-containing area AoThe effective thickness h, the free hydrocarbon oil content TfThe surface crude oil density rhooAnd the volume coefficient B of the original crude oiloiSubstituting into the shale oil geological reserve calculation formula:
Noil＝Ao×h×Tf×ρo/BoiObtaining the geological reserve N of the continental facies matrix type shale oil of the reserve calculation unitOil。
The beneficial effect of adopting the further scheme is that: the method for calculating the geological reserve of the continental facies matrix shale oil has strong operability and firm theoretical foundation, the key calculation parameters are fully selected according to the basis, technical support is provided for reporting the matrix shale oil reserve, the method has reference and reference functions on the research and the perfection of the method for calculating the shale oil reserve, and the method has important guiding significance on the exploration and the development of the shale oil.
In addition, the invention also provides a storage medium, wherein the storage medium stores instructions, and when the instructions are read by a computer, the computer is caused to execute the method for calculating the geological reserve of the continental land-based shale oil according to any one of the technical schemes.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic step diagram of a method for calculating geologic reserves of continental facies matrix shale oil according to an embodiment of the present invention;
fig. 2 is a schematic step diagram of a method for calculating geologic reserves of continental facies matrix shale oil according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
As shown in fig. 1, a schematic step diagram of a method for calculating geological reserves of continental facies matrix shale oil according to an embodiment of the present invention includes the following steps:
110. and dividing the reserve calculation units by taking the sweet spot area of the continental facies matrix type shale interval as a basic unit according to the drilling control degree, the construction and spreading and the fracturing measure modification technology which can be implemented by the shale sweet spot interval.
And the reserve calculation unit divides the real description and reflects the stratum spread characteristics. The division of the reserve calculation units is based on geological characteristics of continental facies matrix type shale, and the most reasonable reserve calculation units are divided by combining the practical drilling control degree and fracturing measure modification technology.
120. And for the reserve calculation unit, determining calculation parameters of the continental facies matrix type shale oil geological reserve according to recorded data by relying on earthquake, well logging, rock core, testing and rock core analysis and assay recorded data.
It should be understood that the logged data includes seismic data, well logs, core tests, and core analysis tests on the continental facies matrix shale geology that needs to be computed.
130. And obtaining the continental facies matrix type shale oil geological reserves of the reserve calculation unit through the values of the calculation parameters of the continental facies matrix type shale oil geological reserves and a shale oil geological reserve calculation formula.
It should be understood that the shale oil geological reserve calculation formula depends on the calculation parameters, and is determined according to the specific calculation parameters.
Wherein, the shale oil geological reserve calculation formula is obtained according to derivation. Conventionally, the volumetric method is the main method for calculating geological reserves by using static data before the production of oil and gas fields. However, for shale oil, a volumetric method is generally adopted, and parameters of an oil-containing area, an effective thickness, an effective porosity, an oil-containing saturation, a ground crude oil density and a crude oil volume coefficient are involved in the volumetric method. However, for continental facies matrix shale oil, it is difficult to obtain accurate values of parameters such as effective porosity and oil saturation, and therefore, geological reserves cannot be obtained by using a conventional calculation method. In order to accurately obtain the geological reserve of the continental facies matrix type shale oil, a shale oil geological reserve calculation formula is deduced by analyzing and researching the oil content parameter of the free hydrocarbon based on a volumetric method.
According to the embodiment, a unit division standard is established and matrix type shale oil reserve calculation parameters are obtained through research by combining the occurrence form and the mining mechanism of the continental facies matrix type shale oil and utilizing data such as earthquake, well logging, testing and core analysis and assay, so that a geological reserve calculation method which is suitable for the initial stage of the continental facies matrix type shale oil exploration and has operability is established, reference is provided for the research and the perfection of the continental facies matrix type shale oil reserve calculation method in China, and the development and planning of the shale oil exploration can be guided.
Based on the embodiment, further, the sweet spot area of the continental facies matrix type shale interval section is used as a basic unit, and the transverse plane reserve calculation unit is divided according to the well drilling control degree, the structure distribution and the fracturing measure modification technology reach range;
and dividing the longitudinal section reserve calculation unit according to the maximum reachable thickness of the measure reconstruction technology.
As shown in fig. 2, a schematic step diagram of a method for calculating geologic reserves of continental rise matrix shale oil according to another embodiment of the present invention includes step 110, where step 120 and step 130 specifically include:
121. and determining an oil-containing boundary according to the recorded data, the dessert distribution of the shale layer interval and a detection and evaluation well, a well spacing of a production well or a half extrapolation method of the well spacing, thereby obtaining the oil-containing area.
Generally, the oil-containing area refers to the area having the range of the industrial oil flow, and generally refers to the planar projected area. The size of the oil-containing area depends on the trap type of the oil reservoir, the change of the physical property plane of the reservoir and the distribution rule of oil, gas and water, and the oil-containing boundary can be correctly determined after the trap form, the distribution rule of the reservoir, the positions of a fault and a lithologic pinch-out line, an oil-water interface and the oil reservoir type for controlling the distribution of oil, gas and water are found out. However, under the condition that the geological reserve boundary of land-based shale oil is uncertain, a calculation line is extrapolated according to reasonable distance in different directions by means of half extrapolation of detection and evaluation wells, production well spacing or well spacing, and the calculation line is a certain ancient model on a constructional diagram and can be a regular circular arc line or a straight line or an irregular smooth connection line of midpoints between wells of an edge-separating oil well and an adjacent well. And (4) obtaining the oil-containing area through a specific oil-containing boundary.
Specifically, how to obtain the calculation formula of the oil-containing area through a specific oil-containing boundary is a common formula, and is not described in detail in the application.
122. And obtaining the effective thickness of the continental facies matrix type shale oil layer section through the correlation among a density curve, a resistance curve, a gamma curve, lithology, electrical property, physical property and oil-bearing property, brittleness, horizontal crustal stress anisotropy and hydrocarbon source rock characteristics in logging information.
The effective thickness refers to the thickness of the part with industrial oil production energy in the reservoir and the effective thickness of the continental facies matrix type shale oil interval, and at least nine basic logging curves, namely three resistivity, acoustic wave, neutron, density triple pore, natural potential, natural gamma and well diameter auxiliary logging series, are obtained through exploration wells and evaluation wells. The lower limit standard of the effective thickness is divided into lithology, physical property, oil-containing property and electrical property, the electrical property is an operation standard for actually dividing the effective thickness, namely an oil, gas, water and dry layer judgment standard established by combining logging data with testing oil data mainly, and an interlayer deduction standard established by combining the logging data with core data mainly. The lithology, physical property and oil-containing standard is only calculated through actual data statistics or theories, and is in corresponding relation or conversion relation with the electrical property standard.
It should be understood that there are many ways to obtain effective thickness, particularly from the well log data, density curve, resistivity and gamma curve, lithology, electrical properties, physical properties, oil content correlation and brittleness, horizontal geostress anisotropy, and source rock characteristics, and this embodiment is not limited thereto.
123. And establishing a logging interpretation model according to the experimental analysis and the logging response characteristics, and determining the oil content of the free hydrocarbon.
And (4) establishing a logging interpretation model according to the experimental analysis and the logging response characteristics, and obtaining the oil content of the free hydrocarbon by a common method through the logging interpretation model.
In order to accurately obtain the geological reserves of the continental facies matrix shale oil, the oil content of free hydrocarbon is innovatively adopted as a parameter for calculating the geological reserves, a logging interpretation model is established through sampling test through the oil content of the free hydrocarbon which can be collected at present, the oil content of the free hydrocarbon is obtained, and specifically, the oil content of the free hydrocarbon is obtained.
124. And determining the crude oil density on the ground according to the shale oil test and test result of the research area of the continental facies matrix type shale layer section.
The surface crude oil density is determined by performing a test assay on the shale oil in the area of interest.
In particular, crude oil density is typically obtained by taking samples uphole during oil recovery and performing laboratory analytical tests.
125. The volume coefficient of the original crude oil is obtained by sampling and analyzing high-pressure physical properties, or is obtained by the relation between the volume coefficient of a research area and the density of the ground crude oil.
In a reserve calculation unit, the volume coefficient of crude oil and the density of crude oil have little change, the volume coefficient of crude oil adopts high-pressure physical sampling, and the density of crude oil adopts the arithmetic mean value of the analysis of a ground crude oil sample to achieve the precision of reserve calculation. Wherein, the volume coefficient of the crude oil is calculated by adopting underground oil volume balance, and the average crude oil density is calculated by adopting ground crude oil volume balance.
It should be understood that the method of obtaining the volume coefficient of the original crude oil through sampling and analyzing the high-pressure physical properties or calculating the volume coefficient of the original crude oil through the relationship between the volume coefficient of the research area and the density of the ground crude oil may be optional according to actual situations, and is not limited in this embodiment.
131. Oil area AoEffective thickness h, free hydrocarbon oil content TfSurface crude oil density ρoAnd volume coefficient B of original crude oiloiSubstituting into a shale oil geological reserve calculation formula:
Noil＝Ao×h×Tf×ρo/BoiObtaining the geological reserve N of the continental facies matrix type shale oil of the reserve calculation unitOil。
Wherein A isoIs calculated in km2The unit of h is m, TfIs calculated in percent, poIs calculated in units of t/m3. Further, the volume V of matrix shale oil can be represented by the formula V ═ aoAnd x h is calculated.
The volume V' of the free hydrocarbon of the continental facies matrix type shale oil can be obtained by the formula V ═Ao×h×TfAnd (4) calculating.
Through rhoo/BoiAnd converting the density of the ground crude oil into the density of the underground crude oil, and multiplying the density by the volume V of the matrix type shale oil in the formula to obtain the quality of the matrix type shale oil.
Furthermore, the present invention also provides a storage medium having stored thereon a computer program that, when executed by a processor, implements the steps of the method of calculating a continental facies-matrix type shale oil geological reserve in the above-described embodiments.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of calculating geologic reserves of continental facies-based shale oil, the method comprising the steps of:
taking a sweet spot area of a continental facies matrix type shale interval as a basic unit, and dividing a reserve calculation unit according to the drilling control degree, the construction spread and the fracturing measure modification technology which can be implemented by the shale sweet spot interval;
determining calculation parameters of the continental facies matrix type shale oil geological reserves according to recorded data by relying on earthquake, well logging, core, testing and core analysis assay recorded data;
and obtaining the land-based shale oil geological reserve of the reserve calculation unit according to the value of the calculation parameter of the land-based shale oil geological reserve and a shale oil geological reserve calculation formula.
2. The calculation method according to claim 1, wherein the reservoir calculation unit is divided by taking the sweet spot of the continental facies matrix type shale interval as a basic unit according to the well drilling control degree, the formation spread and the fracturing measure modification technology which can be implemented by the shale sweet spot interval, and specifically comprises the following steps:
dividing a transverse plane reserve calculation unit by taking a sweet spot area of a continental facies matrix type shale interval as a basic unit according to well drilling control degree, structure spread and fracturing measure modification technology coverage;
and dividing the longitudinal section reserve calculation unit according to the maximum reachable thickness of the measure reconstruction technology.
3. The computing method according to claim 1,
the calculation parameters of the continental facies matrix type shale oil reserves comprise oil-containing area, effective thickness, oil content of free hydrocarbon, density of ground crude oil and volume coefficient of original crude oil.
4. The computing method according to claim 3,
and determining an oil-containing boundary according to the recorded data, the dessert distribution of the continental facies matrix type shale interval and a detection and evaluation well, a production well interval or a half extrapolation method of the well interval to obtain the oil-containing area.
5. The computing method according to claim 3,
and determining the effective thickness of the continental facies matrix type shale oil interval through the correlation among a density curve, a resistance curve and a gamma curve, lithology, electrical property, physical property and oil-bearing property, brittleness, horizontal crustal stress anisotropy and characteristics of the hydrocarbon source rocks in the logging information.
6. The computing method according to claim 3,
and establishing a logging interpretation model through experimental analysis and logging response characteristics to determine the oil content of the free hydrocarbon.
7. The computing method according to claim 3,
and determining the crude oil density on the ground according to the shale oil test and test result of the research area of the continental facies matrix type shale interval.
8. The computing method according to claim 3,
the volume coefficient of the original crude oil is obtained through high-pressure physical property sampling analysis, or the volume coefficient of the research area is obtained through the relation between the volume coefficient of the research area and the density of the ground crude oil.
9. The calculation method according to any one of claims 3 to 8, wherein the obtaining of the land-based shale oil geological reserves of each reserve calculation unit according to the land-based shale oil reserve calculation parameters and a shale oil geological reserve calculation formula comprises the following steps:
the oil-containing area AoThe effective thickness h, the free hydrocarbon oil content TfThe surface crude oil density rhooAnd the volume coefficient B of the original crude oiloiSubstituting into the shale oil geological reserve calculation formula:
Noil＝Ao×h×Tf×ρo/BoiObtaining the geological reserve N of the continental facies matrix type shale oil of the reserve calculation unitOil。
10. A storage medium having stored therein instructions which, when read by a computer, cause the computer to execute a method of calculating a land-based shale oil geological reserve according to any one of claims 1 to 9.
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Effective date of registration: 20201202 Address after: 100000 Beijing city Dongcheng District No. 16 Andrew Applicant after: PetroChina Co.,Ltd. Address before: 300280 Dagang Oilfield Exploration and Development Research Institute, Xingfu Road, Dagang Oilfield, Binhai New Area, Tianjin Applicant before: CNPC DAGANG OILFIELD BRANCH Co. |
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Application publication date: 20200221 |
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