Method, device and equipment for predicting shale oil imbibition utilization efficiency and storage medium

Abstract

The invention relates to the technical field of unconventional shale oil and gas reservoir exploration, in particular to a method, device and equipment for predicting shale oil imbibition utilization efficiency and a storage medium. According to the method, under the condition that the rock core is not damaged, the content of oil in different aperture intervals after the rock core is pressurized and saturated with oil is rapidly quantified through the two-dimensional nuclear magnetic resonance technology, and then the content of oil in the shale oil in different aperture intervals under the stratum condition and the overall critical use lower limit are utilized; the imbibition and oil discharge efficiency of the whole shale oil core can be rapidly, accurately and quantitatively represented. The shale oil core imbibition utilization efficiency can be rapidly and accurately measured under the condition that the core is not damaged, and the method provides an effective means for revealing an interaction reaction mechanism of shale oil reservoir rock and an injected medium, a shale oil reservoir rock imbibition oil extraction mechanism, a shale oil reservoir recovery efficiency improving mechanism and the like. The method has important engineering value and scientific significance for promoting effective economic development of shale reservoirs in China.

Description

Technical Field

[0001] This disclosure relates to the field of unconventional shale oil and gas reservoir exploration technology, and in particular to methods, apparatus, equipment and storage media for predicting shale oil permeation and utilization efficiency. Background Technology

[0002] Shale oil refers to petroleum resources contained in shale formations, primarily composed of shale. This includes oil in the pores and fractures of mudstone and shale, as well as oil resources in adjacent and interlayered layers of tight carbonate or clastic rocks within the mudstone and shale formations. Shale oil reservoirs exhibit multi-scale pore-throat structures, with widespread micro- and nano-scale pore-throats. Compared to conventional reservoirs, they possess higher capillary forces and more pronounced adsorption-driven oil recovery. Adsorption-driven oil recovery refers to the process where, when the fractures surrounding the matrix block are filled with water, the injected water from the fractures or large pores is drawn into the matrix block by capillary forces, displacing the crude oil in the matrix and thus achieving a redistribution of oil and water outside the matrix. Adsorption occurs in several key stages of shale oil reservoir development, including volumetric fracturing and water injection, and is one of the important factors affecting shale oil production capacity. Clarifying the characteristics of adsorption and evaluating its utilization efficiency are of great significance for improving shale oil recovery rates.

[0003] In existing technologies, the evaluation of shale oil percolation efficiency mainly relies on laboratory percolation tests, which are categorized into mass methods, volumetric methods, and nuclear magnetic resonance (NMR) methods. The mass method involves treating shale cores and placing them in a pre-prepared percolation solution. During percolation, the core mass changes, and this change is monitored over time using an electronic balance. The volumetric method utilizes a self-made laboratory percolation apparatus. The treated core is placed in the pre-prepared percolation solution, and the volume of oil discharged is recorded over time. The NMR method uses the T2 spectrum obtained during the percolation experiment to distinguish the fluid movement in different pore sizes. The mass and volumetric methods involve relatively cumbersome manual measurement and are prone to significant errors. While NMR provides precise measurement, a single-dimensional NMR signal cannot distinguish between oil and water signals, requiring the addition of heavy water or soaking in strong water to eliminate the water signal. Furthermore, these methods require relatively long percolation experiments (over one month) to determine percolation efficiency, and the cores subjected to chemical percolation experiments are contaminated and damaged, making further experiments impossible.

[0004] In conclusion, there is an urgent need for a new method to rapidly predict the efficiency of shale oil percolation and utilization. Summary of the Invention

[0005] To address the aforementioned issues, this disclosure provides a method, apparatus, equipment, and storage medium for predicting shale oil adsorption and utilization efficiency, thereby resolving the problems of excessively long experimental cycles and core contamination damage in existing shale oil adsorption and utilization efficiency evaluation methods.

[0006] In a first aspect, a method for predicting the shale oil adsorption and utilization efficiency, the method comprising:

[0007] Shale oil samples were drilled from the area to be measured, a two-dimensional NMR template of the samples was established, and the saturated oil signal quantity of the samples was determined.

[0008] The oil signal quantity after sample permeation is determined based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity.

[0009] The saturated oil signal quantity and the oil signal quantity after the sample infiltration were used to calculate the shale oil infiltration utilization efficiency in the area to be measured.

[0010] Furthermore, the comprehensive percolation efficiency curve was obtained through the following method:

[0011] The overall percolation efficiency curve was obtained using the following method:

[0012] Several rock samples with different physical properties were prepared;

[0013] Two-dimensional nuclear magnetic resonance (NMR) was measured on several rock samples to establish a two-dimensional NMR template for the rock samples and to divide several permeation and absorption regions.

[0014] Based on a two-dimensional NMR template of rock samples, the saturated oil signal quantity and the oil signal quantity after infiltration were determined.

[0015] Based on the saturated oil signal quantity and the oil signal quantity after absorption, comprehensive absorption efficiency curves are established for several absorption regions.

[0016] Furthermore, two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish two-dimensional NMR templates for the rock samples, including:

[0017] Two-dimensional NMR was measured on the dried wash oil sample to determine the location of kerogen, clay-bound water, and structural water.

[0018] Furthermore, two-dimensional NMR was measured on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included:

[0019] Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on a saturated water sample to determine the location of the water.

[0020] Furthermore, two-dimensional NMR was measured on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included:

[0021] Centrifuge the saturated water sample and measure the two-dimensional nuclear magnetic resonance of the centrifuged sample to determine the location of the bound water.

[0022] Furthermore, two-dimensional NMR was measured on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included:

[0023] The saturated oil was dried, and the two-dimensional nuclear magnetic resonance of the saturated oil sample was measured to determine the location of the oil.

[0024] Furthermore, two-dimensional NMR was measured on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included:

[0025] Centrifuge the saturated oil sample and measure the two-dimensional nuclear magnetic resonance of the centrifuged sample to determine the location of the movable oil.

[0026] Furthermore, several seepage zones are defined, including:

[0027] Based on the T1, T2, and T1 / T2 ratios of different percolation regions, percolation regions are divided on a two-dimensional NMR plate.

[0028] Furthermore, the saturated oil signal quantity and the oil signal quantity after absorption are determined, including:

[0029] After washing the oil, the core was placed into a piston container, vacuumed for M1 hours, saturated with simulated shale oil under pressure K, aged in a constant temperature chamber for M2 hours, and then the core was taken out and weighed.

[0030] Two-dimensional nuclear magnetic resonance (NMR) was used to determine the T1 and T2 spectra after oil saturation without damaging the core. Oil-water regions were divided on the two-dimensional NMR chart, and the oil signal display area containing bound oil and mesoporous oil was selected. Software quantified the oil signal quantity W in different pore sizes of each core under oil saturation conditions. x，饱和 , where x is the coordinate value of T2.

[0031] Furthermore, determining the saturated oil signal quantity and the oil signal quantity after absorption also includes:

[0032] Saturated oil cores were placed in piston containers, and permeation media were added. The piston containers were then placed in a constant temperature chamber, set to the formation temperature, and pressurized to the reservoir pressure to conduct permeation experiments. After day 1 of the experiment, the cores were removed and weighed, and the T1 and T2 spectra after permeation were tested using two-dimensional nuclear magnetic resonance technology.

[0033] Software quantifies the amount of oil signal W in different pore sizes after permeation of each core sample. x，渗吸后 , where x is the coordinate value of T2.

[0034] Furthermore, based on the saturated oil signal quantity and the oil signal quantity after permeation, comprehensive permeation efficiency curves are established for several permeation regions, including:

[0035] Calculate the percolation efficiency I at the same T2 location within the same percolation region;

[0036] For different permeation zones, a one-dimensional functional relationship between pore size T2 and permeation efficiency I was established. Based on the one-dimensional functional relationship, permeation efficiency curves with different T2 coordinates were obtained for different permeation zones of each rock sample.

[0037] Based on the permeation efficiency curve, the permeation rates of shale oil cores with different physical property levels are integrated to obtain the comprehensive permeation efficiency curves of different permeation zones and different T2 coordinates in the target area of ​​shale oil.

[0038] Furthermore, the calculation of the percolation efficiency I at the same T2 location within the same percolation region includes:

[0039] Sum the oil signal quantities at the same T2 position within the same absorption region, and then calculate based on the saturated oil signal quantity W. x，饱和 The saturated oil signal quantity W in the first permeation region is obtained. x①，饱和 Based on the oil signal quantity W after absorption x，渗吸后 The oil signal quantity W after the first absorption region was obtained. x①，渗吸后 , where the number ① represents the area to which the infiltration occurs;

[0040] Based on the saturated oil signal W in the first permeation region x①，饱和 And the oil signal quantity W after the first absorption zone x①，渗吸后 The calculated permeation efficiency at the same T2 position in the first permeation region is obtained. The same operation is performed in other permeation regions to obtain the permeation efficiency at the same T2 position in different permeation regions.

[0041] Furthermore, based on the saturated oil signal quantity W in the first permeation region... x①，饱和 And the oil signal quantity W after the first absorption zone x①，渗吸后 The calculated percolation efficiency at the same T2 position in the first percolation region is obtained, including:

[0042] The permeation rate at each oil signal location at different T2 coordinates in a two-dimensional nuclear magnetic resonance image is calculated using the following formula:

[0043] I x =(W x①，饱和 -W x①，渗吸后 ) / W x①，饱和 ;

[0044] Among them, I x W represents the permeability of the rock sample at point T2 = x; x①，渗吸后 W represents the oil signal quantity after seepage at point T2 = x in the first seepage region; x①，饱和 This represents the oil signal quantity at point T2 = x in the first permeation region under saturated oil conditions.

[0045] Furthermore, based on the permeation efficiency curves, the permeation rates of shale oil cores with different physical property levels are integrated, including:

[0046] The comprehensive permeation efficiency is obtained by averaging or weighted averaging the permeation efficiency at the same T2 location for shale oil cores with different physical property levels.

[0047] Based on the correspondence between T2 position and overall percolation efficiency, an overall percolation efficiency curve is established.

[0048] Furthermore, shale oil samples were drilled from the area to be tested, a two-dimensional NMR template was established for the samples, and the saturated oil signal quantity of the samples was determined, including:

[0049] Shale oil samples were drilled from the target area, and the T1 and T2 spectra of the samples were measured using two-dimensional nuclear magnetic resonance (NMR) technology without damaging the core. Software was used to quantify the oil signal quantity in different pore sizes of the core sample under various conditions, specifically the saturated oil signal quantity W. x，样品 , where x is the coordinate value of T2.

[0050] Furthermore, based on the comprehensive percolation efficiency curve and the sample saturated oil signal quantity, the oil signal quantity after percolation of the sample is determined, including:

[0051] Based on the two-dimensional NMR template of the sample, according to the T1 and T2 values ​​of different percolation regions... 2、 T 1 / The T2 critical value is used to divide the area into several permeation zones;

[0052] The saturated oil signal of the sample at the same T2 position in different permeation regions is summed to obtain the saturated oil signal of the sample at the T2 position.

[0053] The oil signal quantity of the sample at position T2 after permeation was obtained based on the comprehensive permeation efficiency curve and the saturated oil signal quantity of the sample at position T2.

[0054] Furthermore, based on the comprehensive permeation efficiency curve and the saturated oil signal quantity of the sample at position T2, the oil signal quantity after permeation of the sample at position T2 is obtained, which also includes:

[0055] Calculate the oil signal quantity W after seepage at coordinate T2. x，渗吸后 The formula is as follows:

[0056] W x，渗吸后 =W x，样品 ×(1-I x );

[0057] Among them, I x W represents the permeation rate of the sample at point T2 = x; x，样品 W represents the saturated oil signal quantity at point T2 = x; x，渗吸后 This represents the oil signal quantity at point T2=x after percolation.

[0058] Furthermore, based on the saturated oil signal quantity and the oil signal quantity after sample percolation, the shale oil percolation efficiency in the area to be measured is calculated, including:

[0059] Sum the saturated oil signal data of all samples to obtain W. 总和，样品 ;

[0060] Sum the oil signal data after all samples have undergone percolation to obtain W. 总和，渗吸后 ;

[0061] The sum of the saturated oil signal quantities W in the sample 总和，样品 The sum of oil signal quantities W after permeation and adsorption of shale oil cores 总和，渗吸后 The data was used to calculate the seepage and mobilization efficiency I of the shale oil core in this block. The formula is as follows:

[0062] I = (W 总和，样品 -W 总和，渗吸后 ) / W 总和，样品 ;

[0063] Among them, W 总和，样品 W represents the sum of the saturated oil signal in the sample; 总和，渗吸后 The value represents the total oil signal after seepage in the shale oil core; I represents the seepage utilization efficiency of this sample.

[0064] Secondly, an apparatus for predicting the efficiency of shale oil infiltration and utilization includes: a saturated oil signal quantity determination unit, an infiltration and utilization oil signal quantity determination unit, and an infiltration and utilization efficiency measurement unit.

[0065] The saturated oil signal quantity determination unit is used to drill shale oil samples from the area to be measured, establish a two-dimensional NMR template of the sample, and determine the saturated oil signal quantity of the sample.

[0066] The oil signal quantity determination unit after permeation is also used to determine the oil signal quantity after permeation of the sample based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity.

[0067] The percolation efficiency measurement unit is also used to calculate the percolation efficiency of shale oil in the area to be measured based on the saturated oil signal quantity of the sample and the oil signal quantity after percolation.

[0068] Thirdly, an electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0069] Memory, which stores computer programs;

[0070] When a processor executes a computer program stored in memory, it implements the aforementioned method for predicting the efficiency of shale oil adsorption and utilization.

[0071] Fourthly, a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for predicting shale oil permeation and utilization efficiency.

[0072] This disclosure has at least the following beneficial effects:

[0073] This disclosure enables rapid prediction of shale oil percolation efficiency. This method provides an effective means to elucidate the interaction mechanism between shale oil reservoir rocks and the injection medium, the percolation recovery mechanism of shale oil reservoir rocks, and the enhanced oil recovery mechanism of shale oil reservoirs. This disclosure combines laboratory percolation and drainage tests under reservoir temperature and pressure conditions with two-dimensional nuclear magnetic resonance (NMR) analysis. Based on the two-dimensional NMR T1 and T2 spectra obtained from NMR diagnosis, the utilization of crude oil in different pore sizes is distinguished. Furthermore, percolation and drainage efficiency functions for different pore size ranges and the overall critical utilization lower limit are established. Using this as a data volume model, a rapid, accurate, and non-core-damaging method for quickly predicting shale oil percolation efficiency using two-dimensional NMR technology is presented.

[0074] This disclosure enables the rapid quantification of oil content in different pore size ranges of shale oil cores after pressurization and saturation (sample sample) without damaging the core sample using two-dimensional nuclear magnetic resonance (NMR) technology. Furthermore, by utilizing the adsorption and drainage efficiency functions for different pore size ranges of shale oil under formation conditions established in this disclosure, as well as the overall critical utilization lower limit, the overall adsorption and drainage efficiency of shale oil cores can be rapidly and accurately quantitatively characterized. This disclosure provides an effective means to rapidly, accurately, and non-destructively determine the adsorption and utilization efficiency of shale oil cores, elucidating the interaction mechanism between shale oil reservoir rocks and the injection medium, the adsorption and recovery mechanism of shale oil reservoir rocks, and the enhanced oil recovery mechanism of shale oil reservoirs. This disclosure has significant engineering value and scientific significance for promoting the effective and economical development of shale reservoirs in my country.

[0075] Other features and advantages of this disclosure will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0076] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0077] Figure 1 This is a schematic diagram of the prediction method flow according to an embodiment of the present disclosure;

[0078] Figure 2 A schematic diagram showing the division of shale oil seepage zones in a target area;

[0079] Figure 3 a represents the T2 permeation efficiency curves of different pore sizes in different permeation zones of a single shale oil core A in a certain region; Figure 3b represents the T2 permeation efficiency curve of different pore sizes in different permeation zones of a single shale oil core B in a certain region; Figure 3 c is a schematic diagram of the comprehensive permeation efficiency curves of different permeation zones with different T2 coordinates after integrating shale oil cores A and B in the target area;

[0080] Figure 4 This is a schematic diagram of the predictive device structure according to an embodiment of the present disclosure;

[0081] Figure 5 This is a schematic diagram of the electronic device structure. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0083] like Figure 1 As shown, a method for predicting the shale oil adsorption and utilization efficiency includes:

[0084] S101, Drill shale oil samples from the area to be measured, establish a two-dimensional NMR template for the samples, and determine the saturated oil signal quantity of the samples;

[0085] S102, Determine the oil signal quantity after sample permeation based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity;

[0086] S103, based on the saturated oil signal quantity of the sample and the oil signal quantity after the sample has absorbed oil, the shale oil absorption and utilization efficiency of the area to be measured is calculated.

[0087] The overall percolation efficiency curve was obtained using the following method:

[0088] Several rock samples with different physical properties were prepared;

[0089] Two-dimensional nuclear magnetic resonance (NMR) was measured on several rock samples to establish a two-dimensional NMR template for the rock samples and to divide several permeation and absorption regions.

[0090] Based on a two-dimensional NMR template of rock samples, the saturated oil signal quantity and the oil signal quantity after infiltration were determined.

[0091] Based on the saturated oil signal quantity and the oil signal quantity after absorption, comprehensive absorption efficiency curves are established for several absorption regions.

[0092] The specific implementation details are as follows:

[0093] The overall technical solution includes four steps: preparing rock samples with different pore and permeability characteristics, conducting indoor physical simulation experiments, processing experimental data and establishing a data volume, and determining the permeation and mobilization efficiency of fresh samples.

[0094] Preparation of rock samples with different physical properties:

[0095] Shale oils are diverse, with different types exhibiting varying lithologies and pore structures. Therefore, it is crucial to first identify the shale oil type in the target area, and then accurately pinpoint the sweet spot lithology. Furthermore, core samples with different physical properties exhibit variations in pore structure and pore size. To comprehensively determine the permeation and kinetic characteristics of the shale oil in the target area, core samples with different physical property levels should be selected to achieve a comprehensive evaluation of the entire pore size, thereby increasing the predictive accuracy of the data volume model established by this method.

[0096] By accurately classifying the shale oil type in the target area using geological data and core descriptions, and determining the sweet spot lithology based on the property characteristics of the shale oil in the target area, and using well logging facies technology to identify the physical properties at different locations along the wellbore based on the shale oil reservoir properties, several cores (core diameter 2.5 cm, core length approximately 8 cm) of each physical property level were drilled, and the porosity and permeability of the cores under overburden conditions were accurately measured using a high-precision overburden porosity-permeability instrument.

[0097] Establish a two-dimensional NMR template for the target region:

[0098] There are various methods for establishing two-dimensional NMR templates. Considering the subsequent percolation test, this method uses the forward method of establishing the template after oil washing.

[0099] Two-dimensional NMR was measured on the washed oil dried sample to determine the location of kerogen, clay bound water and structural water;

[0100] Two-dimensional nuclear magnetic resonance (NMR) analysis of a saturated water sample was performed to determine the location of the water.

[0101] Centrifuge the water-saturated sample and measure the two-dimensional nuclear magnetic resonance of the centrifuged sample to determine the location of bound water;

[0102] Dry the saturated oil, measure the two-dimensional NMR of the saturated oil sample, and determine the location of the oil.

[0103] Centrifuge the saturated oil sample and measure the two-dimensional nuclear magnetic resonance of the centrifuged sample to determine the location of the movable oil.

[0104] In this way, the two-dimensional NMR map of the target area is established.

[0105] Conduct indoor physical simulation experiments:

[0106] This step involves conducting indoor percolation and two-dimensional nuclear magnetic resonance (NMR) experiments on samples with different physical properties. By carrying out indoor physical model experiments before and after percolation, the movement of oil and water at different pore sizes during the percolation process is realistically reflected, laying the foundation for the subsequent establishment of a data volume model.

[0107] After washing cores with different physical properties, saturated simulated shale oil was generated. Two-dimensional nuclear magnetic resonance (NMR) was used to measure the T1 and T2 spectra after saturation without damaging the cores. Based on the two-dimensional NMR charts, software was used to quantify the oil signal quantity W in different pore sizes (x being the T2 coordinate value) of each core under saturated oil conditions. x，饱和 .

[0108] Each core sample was placed in a piston container, and an adsorption medium was added to simulate a real formation environment. Adsorption experiments were conducted under formation temperature and pressure conditions. After 30 days, the core samples were retrieved, and the post-adsorption T1 and T2 spectra were measured using two-dimensional nuclear magnetic resonance (NMR) technology. The oil signal quantity W in different pore sizes (x being the T2 coordinate value) of each core sample after adsorption was quantified. x，渗吸后 .

[0109] Delineate the seepage zone:

[0110] Comparative analysis of the variation patterns of oil signal quantities (W) in the saturated oil state and the post-absorption state of the same pore size space (x is the T2 coordinate value) of each core sample. x，饱和 —W x，渗吸后 ) Analyze the permeation characteristics and patterns at different pore sizes, classify pore sizes with the same permeation patterns into one category, complete the division of permeation regions on a two-dimensional NMR plate, and clarify the T1, T2, and T1 / T2 critical values ​​for different permeation regions (e.g., Figure 2 (As shown).

[0111] Establish a data body on the osmotic mobilization efficiency for different T2 values:

[0112] Two-dimensional data flattening: Through the nesting and application of two-dimensional NMR plates, the distinction between core oil and water signals was perfectly achieved. Oil signals identified at different T1 and T2 locations were flattened in one dimension, and oil signals at the same T2 location within the same permeation zone were summed, thus yielding W... x，饱和 Convert to W x①，饱和 W x，渗吸后 Convert to W x①，渗吸后 The number ① represents the corresponding osmotic zone.

[0113] Establish permeation efficiency curves for different T2 coordinates in different permeation zones of a single sample: Crude oil in the same permeation zone exhibits the same migration pattern under permeation; therefore, the same data processing mode is adopted to establish a one-dimensional functional relationship between pore size (T2) and permeation efficiency (I) for different permeation zones. Using the established functional relationship, the permeation efficiency curves for different T2 coordinates in different permeation zones of each core sample are obtained (e.g., Figure 3 (as shown in a and 3b).

[0114] To obtain the comprehensive permeability efficiency curves of shale oil in different permeation zones and at different T2 coordinates in the target area: Considering that shale cores of different physical property grades have different pore size ranges, the two-dimensional data volumes of permeability rates of shale oil cores of different physical property grades are integrated to obtain the permeability efficiency curves of shale oil in different permeation zones and at different T2 coordinates in the target area (e.g., Figure 3 (as shown in c).

[0115] As the number of actual experimental samples increases, the kinetic curve of percolation efficiency can be continuously updated.

[0116] Prediction of the adsorption and mobilization efficiency of non-adsorbed shale oil samples in the target area:

[0117] 1. Prediction of the percolation and mobilization efficiency of fresh shale oil samples:

[0118] A. Calculate the total oil signal quantity W of a fresh shale oil sample. 总和，新鲜 Fresh shale oil samples were drilled from the target area, and the T1 and T2 spectra of the fresh samples were determined using two-dimensional nuclear magnetic resonance (NMR) technology without damaging the core. The oil signal quantity W in different pore sizes (x being the T2 coordinate value) of the fresh core samples was quantified. x，新鲜 Then, the oil signal data of all fresh sample oil signal points are summed to obtain W. 总和，新鲜 .

[0119] B. Flattening of 2D NMR data: Based on the already defined permeation regions (e.g., Figure 2 As shown, the two-dimensional NMR data of the fresh sample is flattened into one dimension to achieve W. x，新鲜 Convert to W x①，新鲜 or W x②，新鲜 or W x③，新鲜 .

[0120] C. Calculate the total oil signal quantity W after absorption. 总和，渗吸后 Based on the already defined seepage activation zones (①, ②, ③), and combined with the comprehensive seepage efficiency curves of different T2 coordinates in different seepage zones of the target shale oil area (e.g., ... Figure 3 As shown in c), calculate the oil signal quantity W after seepage at different T2 coordinates in each seepage region. x1①，渗吸后 W x2②，渗吸后 W x3③，渗吸后The oil signal data after permeation in different permeation zones are summed to obtain W. 总和，渗吸后 Based on W 总和，新鲜 and W 总和，渗吸后 This allows us to predict the percolation efficiency (I) of the fresh core sample for that shale oil.

[0121] ②: Prediction of the percolation and mobilization efficiency of non-fresh shale oil samples:

[0122] A. Calculate the total oil signal quantity W of a saturated shale oil sample. 总和，饱和油 Shale oil samples were drilled from the target area, washed, and pressurized to saturate simulated shale oil. Two-dimensional nuclear magnetic resonance (NMR) was used to determine the T1 and T2 spectra of the saturated oil samples without damaging the core. The oil signal quantity W in different pore sizes (x being the T2 coordinate value) under saturated oil conditions was quantified. x，饱和油 Then, the oil signal data of all saturated oil samples are summed to obtain W. 总和，饱和油 .

[0123] B. Flattening of 2D NMR data: Based on the already defined permeation regions (e.g., Figure 2 As shown, the two-dimensional NMR data of the saturated oil sample is flattened into one dimension to achieve W x，饱和油 Convert to W x①，饱和油 or W x②，饱和油 or W x③，饱和油 .

[0124] C. Calculate the total oil signal quantity W after absorption. 总和，渗吸后 Based on the already defined seepage activation zones (①, ②, ③), and combined with the comprehensive seepage efficiency curves of different T2 coordinates in different seepage zones of the target shale oil area (e.g., ... Figure 3 As shown in c), calculate the oil signal quantity W after seepage at different T2 coordinates in each seepage region. x1①，渗吸后 W x2②，渗吸后 W x3③，渗吸后 The oil signal data after permeation in different permeation zones are summed to obtain W. 总和，渗吸后 Based on W 总和，饱和油 and W 总和，渗吸后 This allows us to predict the percolation efficiency (I) of the non-fresh shale oil core.

[0125] Based on the established comprehensive permeation efficiency curves of different T2 coordinates in different permeation zones, a rapid, accurate, and non-core-damaging method using two-dimensional nuclear magnetic resonance technology has been developed to predict the permeation efficiency of shale oil under formation conditions. This enables the prediction of permeation efficiency of shale oil formations without damaging the core.

[0126] like Figure 4As shown, a device for predicting the shale oil infiltration efficiency includes: a saturated oil signal quantity determination unit 401, an infiltration oil signal quantity determination unit 402, and an infiltration efficiency measurement unit 403.

[0127] The saturated oil signal quantity determination unit 401 is used to drill shale oil samples from the area to be measured, establish a two-dimensional nuclear magnetic template of the sample, and determine the saturated oil signal quantity of the sample.

[0128] The oil signal quantity determination unit 402 after permeation is also used to determine the oil signal quantity after permeation of the sample based on the comprehensive permeation efficiency curve and the saturated oil signal quantity of the sample.

[0129] The percolation efficiency measurement unit 403 is also used to calculate the percolation efficiency of shale oil in the area to be measured based on the saturated oil signal quantity of the sample and the oil signal quantity after percolation of the sample.

[0130] like Figure 5 As shown, this disclosure provides an electronic device, including a processor 501, a communication interface 502, a memory 503, and a communication bus 504, wherein the processor 501, the communication interface 502, and the memory 503 communicate with each other through the communication bus 504.

[0131] Memory 503 stores computer programs;

[0132] The processor 501 implements the above method when executing a computer program stored in the memory 503.

[0133] This disclosure provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method.

[0134] The computer-readable storage medium may be included in the device / apparatus described in the above embodiments; or it may exist independently and not assembled into the device / apparatus. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0135] According to embodiments of this disclosure, the computer-readable storage medium can be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0136] Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for predicting the efficiency of shale oil adsorption and utilization, characterized in that, The method includes: Shale oil samples were drilled from the area to be measured, a two-dimensional NMR template of the samples was established, and the saturated oil signal quantity of the samples was determined. The oil signal quantity after sample permeation is determined based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity. The saturated oil signal quantity and the oil signal quantity after the sample infiltration were used to calculate the shale oil infiltration utilization efficiency in the area to be measured.

2. The method for predicting shale oil adsorption and utilization efficiency according to claim 1, characterized in that, The overall percolation efficiency curve was obtained using the following method: Several rock samples with different physical properties were prepared; Two-dimensional nuclear magnetic resonance (NMR) was measured on several rock samples to establish a two-dimensional NMR template for the rock samples and to divide several permeation and absorption regions. Based on a two-dimensional NMR template of rock samples, the saturated oil signal quantity and the oil signal quantity after infiltration were determined. Based on the saturated oil signal quantity and the oil signal quantity after absorption, comprehensive absorption efficiency curves are established for several absorption regions.

3. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish a two-dimensional NMR template for the rock samples, including: The sample was washed with oil and dried, and two-dimensional NMR was measured to determine the location of kerogen, clay-bound water, and structural water.

4. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included: The sample was washed with oil and saturated with water, and two-dimensional NMR was measured to determine the location of the water.

5. The method for predicting the shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included: After washing the sample with oil and saturated water, centrifuge it and then perform two-dimensional NMR to determine the location of the bound water.

6. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included: The sample was dried and saturated with oil, and two-dimensional NMR was measured to determine the location of the oil.

7. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Two-dimensional nuclear magnetic resonance (NMR) measurements were performed on several rock samples to establish a two-dimensional NMR template for the rock samples, which also included: The sample was dried and saturated with oil before being centrifuged. Two-dimensional NMR was measured to determine the location of the movable oil.

8. The method for predicting the shale oil permeation and utilization efficiency according to claim 2, characterized in that, Divide the area into several absorption zones, including: Based on the T1, T2, and T1 / T2 ratios of different percolation regions, percolation regions are divided on a two-dimensional NMR plate.

9. The method for predicting the shale oil permeation and utilization efficiency according to claim 2, characterized in that, Determine the saturated oil signal quantity and the oil signal quantity after absorption, including: After washing the oil, the core was placed into a piston container, vacuumed for M1 hours, saturated with simulated shale oil under pressure K, aged in a constant temperature chamber for M2 hours, and then the core was taken out and weighed. Two-dimensional nuclear magnetic resonance (NMR) was used to determine the T1 and T2 spectra after oil saturation without damaging the core. Oil-water regions were divided on the two-dimensional NMR chart, and the oil signal display area containing bound oil and mesoporous oil was selected. Software quantified the oil signal quantity W in different pore sizes of each core under oil saturation conditions. x，饱和 , where x is the coordinate value of T2.

10. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Determining the saturated oil signal quantity and the oil signal quantity after absorption also includes: Saturated oil cores were placed in piston containers, and permeation media were added. The piston containers were then placed in a constant temperature chamber, set to the formation temperature, and pressurized to the reservoir pressure to conduct permeation experiments. After day 1 of the experiment, the cores were removed and weighed, and the T1 and T2 spectra after permeation were tested using two-dimensional nuclear magnetic resonance technology. Software quantifies the amount of oil signal W in different pore sizes after permeation of each core sample. x，渗吸后 , where x is the coordinate value of T2.

11. The method for predicting the shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Based on the saturated oil signal and the oil signal after absorption, comprehensive absorption efficiency curves are established for several absorption regions, including: Calculate the percolation efficiency I at the same T2 location within the same percolation region; For different permeation zones, a one-dimensional functional relationship between pore size T2 and permeation efficiency I was established. Based on the one-dimensional functional relationship, permeation efficiency curves with different T2 coordinates were obtained for different permeation zones of each rock sample. Based on the permeation efficiency curve, the permeation rates of shale oil cores with different physical property levels are integrated to obtain the comprehensive permeation efficiency curves of different permeation zones and different T2 coordinates in the target area of ​​shale oil.

12. The method for predicting shale oil adsorption and utilization efficiency according to claim 11, characterized in that, The calculation of the percolation efficiency I at the same T2 location within the same percolation region includes: Sum the oil signal quantities at the same T2 position within the same absorption region, and then calculate based on the saturated oil signal quantity W. x，饱和 The saturated oil signal quantity W in the first permeation region is obtained. x①，饱和 Based on the oil signal quantity W after absorption x，渗吸后 The oil signal quantity W after the first absorption region was obtained. x①，渗吸后 , where the number ① represents the area to which the infiltration occurs; Based on the saturated oil signal W in the first permeation region x①，饱和 And the oil signal quantity W after the first absorption zone x①，渗吸后 The calculated permeation efficiency at the same T2 position in the first permeation region is obtained. The same operation is performed in other permeation regions to obtain the permeation efficiency at the same T2 position in different permeation regions.

13. The method for predicting shale oil adsorption and utilization efficiency according to claim 12, characterized in that, Based on the saturated oil signal W in the first permeation region x①，饱和 And the oil signal quantity W after the first absorption zone x①，渗吸后 The calculated percolation efficiency at the same T2 position in the first percolation region is obtained, including: The permeation rate at each oil signal location at different T2 coordinates in a two-dimensional nuclear magnetic resonance image is calculated using the following formula: I x =(W x①，饱和 -W x①，渗吸后 ) / W x①，饱和 ; Among them, I x W represents the permeability of the rock sample at point T2 = x; x①，渗吸后 W represents the oil signal quantity after seepage at point T2 = x in the first seepage region; x①，饱和 This represents the oil signal quantity at point T2 = x in the first permeation region under saturated oil conditions.

14. The method for predicting shale oil adsorption and utilization efficiency according to claim 11, characterized in that, Based on the permeation efficiency curve, the permeation rates of shale oil cores with different physical property levels are integrated, including: The comprehensive permeation efficiency is obtained by averaging or weighted averaging the permeation efficiency at the same T2 location for shale oil cores with different physical property levels. Based on the correspondence between T2 position and overall percolation efficiency, an overall percolation efficiency curve is established.

15. The method for predicting the shale oil percolation and utilization efficiency according to claim 2, characterized in that, Shale oil samples were drilled from the area to be tested, a two-dimensional NMR template was established for the samples, and the saturated oil signal quantity of the samples was determined, including: Shale oil samples were drilled from the target area, and the T1 and T2 spectra of the samples were measured using two-dimensional nuclear magnetic resonance (NMR) technology without damaging the core. Software was used to quantify the oil signal quantity in different pore sizes of the core sample under various conditions, specifically the saturated oil signal quantity W. x，样品 , where x is the coordinate value of T2.

16. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity, the oil signal quantity after permeation of the sample is determined, including: Based on the sample's two-dimensional NMR template, according to the T1, T2, and T3 values ​​of different percolation regions... 1 / The T2 critical value is used to divide the area into several permeation zones; The saturated oil signal of the sample at the same T2 position in different permeation regions is summed to obtain the saturated oil signal of the sample at the T2 position. The oil signal quantity of the sample at position T2 after permeation was obtained based on the comprehensive permeation efficiency curve and the saturated oil signal quantity of the sample at position T2.

17. The method for predicting shale oil adsorption and utilization efficiency according to claim 16, characterized in that, The oil signal quantity after permeation at position T2 is obtained based on the comprehensive permeation efficiency curve and the saturated oil signal quantity of the sample at position T2, and also includes: Calculate the oil signal quantity W after seepage at coordinate T2. x，渗吸后 The formula is as follows: W x，渗吸后 =W x，样品 ×(1-I x ); Among them, I x W represents the permeation rate of the sample at point T2 = x; x，样品 W represents the saturated oil signal quantity at point T2 = x; x，渗吸后 This represents the oil signal quantity at point T2=x after percolation.

18. The method for predicting shale oil adsorption and utilization efficiency according to claim 2, characterized in that, Based on the saturated oil signal quantity and the oil signal quantity after infiltration, the shale oil infiltration and utilization efficiency in the area to be measured is calculated, including: Sum the saturated oil signal data of all samples to obtain W. 总和，样品 ; Sum the oil signal data after all samples have undergone percolation to obtain W. 总和，渗吸后 ; The sum of the saturated oil signal quantities W in the sample 总和，样品 The sum of oil signal quantities W after permeation and adsorption of shale oil cores 总和，渗吸后 The data was used to calculate the seepage and mobilization efficiency I of the shale oil core in this block. The formula is as follows: I=(W 总和，样品 -W 总和，渗吸后 ) / W 总和，样品 ; Among them, W 总和，样品 W represents the sum of the saturated oil signal in the sample; 总和，渗吸后 The value represents the total oil signal after seepage in the shale oil core; I represents the seepage utilization efficiency of this sample.

19. A device for predicting the efficiency of shale oil adsorption and utilization, characterized in that, include: Saturated oil signal quantity determination unit, oil signal quantity determination unit after permeation and absorption, and permeation and absorption efficiency measurement unit; The saturated oil signal quantity determination unit is used to drill shale oil samples from the area to be measured, establish a two-dimensional NMR template of the sample, and determine the saturated oil signal quantity of the sample. The oil signal quantity determination unit after permeation is also used to determine the oil signal quantity after permeation of the sample based on the comprehensive permeation efficiency curve and the sample saturated oil signal quantity. The percolation efficiency measurement unit is also used to calculate the percolation efficiency of shale oil in the area to be measured based on the saturated oil signal quantity of the sample and the oil signal quantity after percolation.

20. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, which stores computer programs; A processor, when executing a computer program stored in memory, implements a method for predicting shale oil adsorption and utilization efficiency as described in any one of claims 1-18.

21. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements a method for predicting the shale oil adsorption and utilization efficiency according to any one of claims 1-18.

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