CN-121994850-A - Method, device, equipment and medium for predicting efficiency for oil seepage and absorption of interlayer shale

CN121994850ACN 121994850 ACN121994850 ACN 121994850ACN-121994850-A

Abstract

The present disclosure relates to the field of unconventional shale oil and gas reservoir exploration technologies, and in particular, to a method, apparatus, device, and medium for predicting efficiency for oil imbibition of an interlayer shale. The method can rapidly predict the efficiency for the infiltration and suction of the interlayer shale oil, and provides an effective means for revealing interaction reaction mechanisms of shale oil reservoir rocks and injection media, oil extraction mechanisms of the shale oil reservoir rocks Dan Shenxi, oil recovery mechanisms of the shale oil reservoir, recovery efficiency improvement mechanisms of the shale oil reservoir and the like. According to the method, a seepage and oil discharge indoor test under the oil reservoir temperature and pressure condition is combined with two-dimensional nuclear magnetic analysis, the movement conditions of crude oil in different aperture spaces are distinguished according to a two-dimensional nuclear magnetic T 1 、T 2 spectrogram of nuclear magnetic diagnosis, and then a seepage and oil discharge efficiency function and an integral critical movement lower limit of each of different aperture intervals are established, and the seepage and oil discharge efficiency function and the integral critical movement lower limit are used as a data volume model, so that a method for rapidly predicting the seepage and oil suction efficiency of the laminated shale by utilizing a two-dimensional nuclear magnetic technology under the rock core condition is provided.

Inventors

TANG JIEYUN
XU MINGZI
GAO YANG
LU FANG
YAN HONGXING
Fu Mingze
HAN HONGDOU
ZHANG XIANGYU
ZHANG HONG
LIU QICHENG
ZHANG SHUTIAN
JIANG MEIZHONG
LU YINLONG
FU WEI
SUN SHIQIANG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (20)

1. A method of predicting efficiency for oil imbibition of a intercalated shale, the method comprising: Sampling the reservoir section of the sandwich shale oil dessert and preparing a plurality of rock samples for testing; respectively measuring two-dimensional nuclear magnetism of a plurality of rock samples to establish a two-dimensional nuclear magnetism plate of a work area; determining an original oil-containing signal quantity in a saturated oil state and a residual oil signal quantity of each measuring point after imbibition; obtaining the imbibition rate of the rock sample through the original oil-containing signal quantity in the saturated oil state and the residual oil signal quantity of each measuring point after imbibition; drilling a fresh sample of the interlayer shale oil core of the target block to be predicted, and determining the oil content signal quantity of the fresh sample; determining the sum of oil signal amounts after shale oil core imbibition according to the oil signal amount of the fresh sample and the rock sample imbibition value; And determining the efficiency for the seepage of the fresh sample core through the sum of the oil signal amounts of the fresh sample and the oil signal amounts of the shale oil core after the seepage.
2. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Measuring two-dimensional nuclear magnetism of a plurality of rock samples respectively, including: For all samples, the selected measurement mode was IR-CPMG mode, and the two-dimensional nuclear magnetism was measured separately to determine the following positions: Determining the positions of kerogen, clay bound water and structural water; determining the position of water; Determining the positions of capillary bound water and movable water; determining the location of the oil; The locations of the mobile oil and the tie-up oil are determined.
3. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Two-dimensional nuclear magnetism is measured respectively to a plurality of rock samples, still includes: values of two-dimensional nuclear magnetism T 1 and T 2 are obtained for the rock sample respectively, and positions of oil and water are identified according to the ratio of T 1 、T 2 to T 1 /T 2 .
4. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Determining the location of kerogen, clay bound water, and structured water, comprising: Washing and drying the sample, measuring two-dimensional nuclear magnetism, and determining the positions of kerogen, clay bound water and structural water.
5. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Determining the location of water, comprising: Washing the sample with oil and saturated water, measuring the two-dimensional nuclear magnetism, and determining the position of the water.
6. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Determining the position of capillary bound water and movable water, comprising: And (3) carrying out centrifugal treatment on the sample after washing oil and saturated water, and measuring nuclear magnetism after centrifugation to distinguish positions of capillary bound water and movable water.
7. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Determining the location of the oil, comprising: And drying the sample, saturating the oil, measuring the two-dimensional nuclear magnetism, and determining the position of the oil.
8. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Determining the location of the mobile oil and the tie-up oil, comprising: And drying the sample, saturating the oil, centrifuging, measuring the two-dimensional nuclear magnetism, and distinguishing the positions of the movable oil and the bound oil.
9. A method of predicting efficiency of oil imbibition of a intercalated shale in accordance with claim 2, wherein, Establishing a two-dimensional nuclear magnetic pattern of a work area, comprising: and respectively drawing the positions of kerogen, clay bound water and structural water, the positions of water, capillary bound water and movable water, the positions of oil and movable oil and the positions of bound oil in a two-dimensional graph with a T 1 spectrum as an ordinate and a T 2 spectrum as an abscissa to obtain the two-dimensional nuclear magnetic graph plate.
10. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Determining an original oil-containing signal quantity in a saturated oil state, comprising: Loading the core after oil washing into a piston container, vacuumizing for M1 hours, saturating simulated shale oil under the pressure K, placing an incubator for aging for M2 hours, and taking out the core for weighing; The method comprises the steps of measuring a T 1 spectrum and a T 2 spectrum of saturated oil by adopting two-dimensional nuclear magnetic resonance on the premise of not damaging a rock core, dividing an oil-water area on a two-dimensional nuclear magnetic pattern plate, selecting an oil signal display area containing bound oil and mesoporous oil, and quantifying oil signal amounts W xy, saturation in different aperture spaces under the state of saturated oil of each rock core by software, wherein x is a T 2 coordinate value, and y is a T 1 coordinate value.
11. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Residual oil signal quantity of each measuring point after imbibition comprises: Placing a saturated oil core into a piston container, adding a imbibition medium, placing the piston container into an incubator to be set to the stratum temperature and pressurizing to the reservoir pressure to carry out imbibition experiments, taking out the core after the experiment D1 days, weighing, and testing the imbibition T 1 spectrum and the imbibition T 2 spectrum by using a two-dimensional nuclear magnetic resonance technology; The software quantifies the oil signal quantity W xy, After imbibition in different aperture spaces after imbibition of each rock core, wherein x is a T 2 coordinate value, and y is a T 1 coordinate value.
12. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Obtaining the rock sample imbibition rate by the original oil-containing signal quantity in the saturated oil state and the residual oil signal quantity of each measuring point after imbibition, comprising: The difference between the saturated oil state signal quantity W xy, saturation and the imbibition oil signal quantity W xy, After imbibition in each aperture space is the variation quantity before and after imbibition of the coordinate position, the ratio of the variation quantity to W xy, saturation is the imbibition rate of the rock sample, wherein x is a T 2 coordinate value, and y is a T 1 coordinate value.
13. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 12, The ratio of the variation to W xy, saturation is rock sample imbibition rate, comprising: the imbibition rate I xy of each oil signal position at different T 1 、T 2 coordinates in the two-dimensional nmr map is calculated by the following formula: I xy ＝(W xy, saturation -W xy, After imbibition )/W xy, saturation ; Wherein I xy represents the permeability value of the rock sample at the point T 2 ＝x,T 1 =y, W xy, After imbibition represents the oil signal after imbibition at the point T 2 ＝x,T 1 =y, and W xy, saturation represents the oil signal in the saturated oil state at the point T 2 ＝x,T 1 =y.
14. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 12, Obtaining the rock sample imbibition rate through the original oil-containing signal quantity in the saturated oil state and the residual oil signal quantity of each measuring point after imbibition, and the method further comprises the following steps: based on the imbibition rates of different T 1 、T 2 coordinates of each shale reservoir core, the imbibition rate values of the same T 1 、T 2 coordinates are averaged to obtain the final rock sample imbibition rate, and the formula is as follows: Where I xy, Final result represents the final permeability value at point T 2 ＝x,T 1 =y, x n represents the nth value, and n represents the total number of samples of valid data.
15. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Drilling a fresh sample of the target block interlayer shale oil to be predicted, determining the oil content signal quantity of the fresh sample, and determining the total sum of the oil content signal quantity of the fresh sample according to the oil content signal quantity of the fresh sample, wherein the method comprises the following steps of: Drilling a target block interlayer type shale oil fresh sample, and measuring a T 1 spectrum and a T 2 spectrum of the fresh sample by utilizing a two-dimensional nuclear magnetic resonance technology on the premise of not damaging a rock core; and quantifying the oil signal quantity W xy, Fresh and fresh in different aperture spaces under the state of each core fresh sample by software, and summing the oil signal quantity data of all fresh sample oil signal points to obtain the oil signal quantity W Sum total , Fresh and fresh of the fresh sample, wherein x is a T 2 coordinate value, and y is a T 1 coordinate value.
16. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Determining a sum of oil signal amounts after shale oil core imbibition according to the oil signal amount of the fresh sample and the rock sample imbibition value, wherein the method comprises the following steps of: The oil signal quantity W xy, After imbibition after imbibition of different T 1 、T 2 coordinates is calculated as follows: W xy, After imbibition ＝W xy, Fresh and fresh -W xy, Fresh and fresh ×I xy, Final result ; Wherein I xy, Final result represents the final imbibition value at T 2 ＝x,T 1 =y point, W xy, Fresh and fresh represents the fresh sample T 2 ＝x,T 1 =y point oil signal quantity, and W xy, After imbibition represents the post imbibition sample T 2 ＝x,T 1 =y point oil signal quantity; Summing all imbibition oil signal quantity data of W xy, After imbibition to obtain the total sum W Sum total , After imbibition of the imbibition oil signal quantity of the shale oil core.
17. The method for predicting the efficiency of oil imbibition of a intercalated shale of claim 1, Determining an efficiency for the imbibition of the fresh sample core from the sum of the fresh sample oil signal amounts and the sum of the oil signal amounts after imbibition of the shale oil core, comprising: The oil signal quantity sum W Sum total , Fresh and fresh of the fresh sample and the oil signal quantity sum W Sum total , After imbibition of the shale oil core after imbibition are used for calculating the imbibition efficiency I of the shale oil core, and the formula is as follows: Wherein W Sum total , Fresh and fresh represents the total sum of oil signal amounts of fresh samples, W Sum total , After imbibition represents the total sum of oil signal amounts of shale oil cores after imbibition, and I represents the efficiency for imbibition of the cores.
18. The device for predicting the efficiency of the imbibition of the interlayer shale oil is characterized by comprising a rock sample preparation unit, a two-dimensional nuclear magnetic pattern plate establishment unit, a rock sample imbibition value determination unit and an imbibition efficiency determination unit; The rock sample preparation unit is used for sampling the reservoir section of the sandwich shale oil dessert and preparing a plurality of rock samples for testing; the two-dimensional nuclear magnetic pattern establishing unit is used for respectively measuring two-dimensional nuclear magnetism of a plurality of rock samples so as to establish a two-dimensional nuclear magnetic pattern of a work area; The rock sample imbibition value determining unit is used for determining an original oil-containing signal quantity in a saturated oil state and residual oil signal quantity of each measuring point after imbibition; The rock sample imbibition value determining unit is also used for obtaining the rock sample imbibition value through the original oil-containing signal quantity in the saturated oil state and the residual oil signal quantity of each measuring point after imbibition; the efficiency determining unit is used for drilling a fresh sample of the target block interlayer shale oil core to be predicted, determining the oil content signal quantity of the fresh sample, and determining the total sum of the oil content signal quantity of the fresh sample according to the oil content signal quantity of the fresh sample; The efficiency determining unit for imbibition is also used for determining the sum of oil signal amounts after imbibition of the shale oil core according to the oil signal amount of the fresh sample and the imbibition value of the rock sample; The efficiency determining unit for the imbibition is further used for determining the efficiency for the imbibition of the fresh sample core through the sum of the oil signal quantity of the fresh sample and the sum of the oil signal quantity of the shale oil core after imbibition.
19. The electronic equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; a memory storing a computer program; a processor for implementing a method of predicting efficiency of oil-in-formation penetration of a laminated shale as claimed in any of claims 1-17 when executing a computer program stored on a memory.
20. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements a method of predicting efficiency of oil-in-formation of a sandwich shale as claimed in any of claims 1-17.

Description

Method, device, equipment and medium for predicting efficiency for oil seepage and absorption of interlayer shale Technical Field The present disclosure relates to the field of unconventional shale oil and gas reservoir exploration technologies, and in particular, to a method, apparatus, device, and medium for predicting efficiency for oil imbibition of an interlayer shale. Background Shale oil gas resources are widely distributed, the potential of resources is huge, and the shale oil gas resources are important strategic alternative energy sources, but realizing scale benefit development is still the biggest problem facing at present. The shale oil reservoir develops a multi-scale pore throat structure, the micro-nano pore throat is widely developed, and compared with a conventional reservoir, the shale oil reservoir has higher capillary force and more obvious imbibition oil displacement effect. Imbibition oil extraction means that when the cracks around the matrix rock block are filled with water, the injected water in the cracks or large pore canals is sucked into the matrix rock block by capillary force and crude oil in the matrix is replaced, so that the redistribution of oil and water outside the matrix is realized. The imbibition exists in a plurality of key stages such as shale oil reservoir volume fracturing and water injection development, is one of important factors influencing shale oil productivity, and has important significance in improving shale oil recovery ratio by clearing imbibition characteristics and evaluating imbibition efficiency. The interlayer shale oil belongs to source-storage coexisting shale oil, the shale layer is wholly oil-containing, and the thin sand layer powerfully stores the oil near the source to form a dessert, so that the dessert reservoir section is mostly thin sand. In the prior art, the efficiency for evaluating shale oil infiltration and absorption is mainly characterized by adopting a self-infiltration and absorption oil discharge indoor test, and the method is divided into a mass method, a volume method and a nuclear magnetic resonance method. The mass method is to treat shale rock core, then put the shale rock core into a pre-prepared imbibition solution, the mass of the rock core changes in the imbibition process, and the change of the mass along with time is monitored by an electronic balance. The volumetric method was performed using a laboratory self-made water absorption instrument. And (3) putting the treated rock core into a pre-prepared imbibition solution, and recording the change of the volume of the discharged oil along with time. The nuclear magnetic resonance method is to distinguish the fluid movement conditions in different aperture spaces according to the T 2 spectrogram of nuclear magnetic resonance diagnosis in the process of the percolation experiment. Mass and volume metering is relatively cumbersome and subject to large errors. The nuclear magnetic method has precise measurement, but the oil-water signal can not be distinguished by simple one-dimensional nuclear magnetic method, and the water signal is eliminated by adding heavy water or soaking strong water. In addition, the methods can obtain the efficiency for imbibition only by carrying out imbibition experiments for a long time (more than 1 month), and the core after carrying out the chemical agent imbibition experiments is polluted and damaged to a certain extent, so that other experiments cannot be carried out. In view of the foregoing, a technical solution for rapidly predicting the efficiency of percolation and suction for the interlayer shale oil is needed. Disclosure of Invention In view of the above problems, the present disclosure provides a method, an apparatus, a device, and a medium for predicting efficiency for oil infiltration of a sandwich shale, which solve the problems of overlong experimental period and pollution damage to a core in the existing efficiency evaluation method for oil infiltration of shale. In a first aspect, a method of predicting efficiency for oil imbibition of a intercalated shale, the method comprising: Sampling the reservoir section of the sandwich shale oil dessert and preparing a plurality of rock samples for testing; respectively measuring two-dimensional nuclear magnetism of a plurality of rock samples to establish a two-dimensional nuclear magnetism plate of a work area; determining an original oil-containing signal quantity in a saturated oil state and a residual oil signal quantity of each measuring point after imbibition; obtaining the imbibition rate of the rock sample through the original oil-containing signal quantity in the saturated oil state and the residual oil signal quantity of each measuring point after imbibition; drilling a fresh sample of the interlayer shale oil core of the target block to be predicted, and determining the oil content signal quantity of the fresh sample; determining the sum of oil signal amounts after shale o