CN112922587B - Method and device for identifying salt frost position - Google Patents
Method and device for identifying salt frost position Download PDFInfo
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- CN112922587B CN112922587B CN201911140426.6A CN201911140426A CN112922587B CN 112922587 B CN112922587 B CN 112922587B CN 201911140426 A CN201911140426 A CN 201911140426A CN 112922587 B CN112922587 B CN 112922587B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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Abstract
According to the method and the device for identifying the salt frost position, the logging porosity and the logging gas saturation are obtained in the logging process, a logging water content curve is established according to the logging porosity and the logging gas saturation, the position corresponding to the point on the logging water content curve, at which the logging water content is greater than a water content threshold value, is determined as the position where the salt frost is precipitated in the reservoir, and the identification of the salt frost precipitation position in the reservoir is realized, so that the method and the device are beneficial to developing the optimization work of an oil testing interval and improving the accuracy of the implementation gas reservoir scale.
Description
Technical Field
The application relates to the technical field of oil and gas exploration and development, in particular to a method and a device for identifying a salt frost position.
Background
In the field of petrogeology research, after a core taken out of a reservoir is left for a period of time, a layer of crystals like frost automatically separate out from the surface, and the crystals are called salt frost. Identifying the exact location of the reservoir's brine in the reservoir is significant to the optimization of the test oil interval and the evaluation of the gas reservoir size.
In the prior art, reservoir salt-see frost is generally considered to be a typical characteristic of a water layer, and researches on the reservoir salt-see frost are mainly focused on a characteristic description stage of the salt-see frost, and a position identification method of the reservoir salt-see frost does not appear.
Thus, there is a need for a method of identifying the location of salt bloom in a reservoir.
Disclosure of Invention
The application provides a method and a device for identifying a salt frost position, which are used for identifying the position of salt frost in a reservoir.
In a first aspect, the present application provides a method for identifying a salt bloom position, including:
in the logging process, acquiring logging porosity and logging gas saturation;
establishing a logging water content curve according to the logging porosity and the logging gas saturation;
and determining the position corresponding to the point of the logging water content greater than the water content threshold value on the logging water content curve as the position where salt frost is precipitated in the reservoir.
Optionally, the establishing a log water content curve according to the log porosity and the log gas saturation comprises:
and establishing a logging water content curve according to the logging porosity and the logging gas saturation through a formula Z=K.phi.1-Sg, wherein Z is the logging water content, K is a region correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
Optionally, before establishing the log water cut curve by the formula z=k×Φ×1-Sg according to the log porosity and the log gas saturation, the method further comprises:
and determining the value of K according to the region construction type and the construction position.
Optionally, before determining the position corresponding to the point on the log water cut length curve where the log water cut is greater than the water cut length threshold as the position where the salt frost is precipitated in the reservoir, the method further includes:
the threshold moisture level is determined from a log.
Optionally, the determining the threshold value of the logging water content comprises:
according to a logging curve, a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation, and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established;
according to the position of salt frost precipitation of the drilled rock core, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate;
determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area;
and determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
In a second aspect, the present application provides a device for identifying a salt frost position, comprising:
the acquisition module is used for acquiring logging porosity and logging gas saturation in the logging process;
the processing module is used for establishing a logging water content curve according to the logging porosity and the logging gas saturation;
the processing module is also used for determining the position corresponding to the point on the logging water content degree curve, where the logging water content degree is greater than the water content degree threshold value, as the position where salt frost is precipitated in the reservoir.
Optionally, the processing module is specifically configured to:
and establishing a logging water content curve according to the logging porosity and the logging gas saturation through a formula Z=K.phi.1-Sg, wherein Z is the logging water content, K is a region correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
Optionally, the processing module is further configured to:
and determining the value of K according to the region construction type and the construction position.
Optionally, the processing module is further configured to:
the threshold moisture level is determined from a log.
Optionally, the processing module is specifically configured to:
according to a logging curve, a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation, and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established;
according to the position of salt frost precipitation of the drilled rock core, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate;
determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area;
and determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
According to the method and the device for identifying the salt frost position, the logging porosity and the logging gas saturation are obtained in the logging process, a logging water content curve is established according to the logging porosity and the logging gas saturation, the position corresponding to the point on the logging water content curve, at which the logging water content is greater than a water content threshold value, is determined as the position where the salt frost is precipitated in the reservoir, and the identification of the salt frost precipitation position in the reservoir is realized, so that the method and the device are beneficial to developing the optimization work of an oil testing interval and improving the accuracy of the implementation gas reservoir scale.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description of the embodiments or the drawings used in the description of the prior art will be given in brief, it being obvious that the drawings in the description below are some embodiments of the application and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a first embodiment of a method for identifying a salt bloom position according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a second implementation of a method for identifying a salt frost position according to a second embodiment of the present application;
fig. 3 is a schematic flow chart of a third embodiment of a method for identifying a salt bloom position according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of an embodiment one of a device for identifying a salt frost position according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the exploration drilling process, the identification of hydrocarbon and water layers is an extremely important geological work. One common method is to judge the hydrocarbon-water layer through a comprehensive logging instrument, and to explain the oil, gas and water layer based on the percentage of total hydrocarbon components, the density, resistivity, temperature and volume of drilling fluid. The specific explanation is as follows:
a gas layer: the outlet drilling fluid has reduced density, increased viscosity, reduced temperature, increased resistivity, increased flow rate, and increased volume.
Oil layer: the outlet drilling fluid has decreased density, increased viscosity, increased temperature, increased resistivity, increased flow rate, and increased volume.
Aqueous layer: the outlet drilling fluid has reduced density, reduced viscosity, increased temperature, increased flow, and reduced resistivity.
Thus, the prior art considers that a water layer is present when the reservoir resistivity suddenly drops during the actual logging process. The presence of the water layer means no further exploitation and is the least desirable phenomenon for geologists.
However, in the ultra-deep reservoir with the depression of the kura Su Gouzao with burial exceeding 6000m, obvious salt frost is seen in multiple wells, and under the background that the logging and logging evidence indicates a water layer, high-yield airflow generally exceeding 20 ten thousand cubic meters is tested and no obvious water layer is seen. The reason for this is that the presence of a significant amount of chloride ions in the salt-containing reservoir enhances conductivity, reduces resistivity, and even is lower than the resistivity of the aqueous layer, thereby creating an illusion of water. Therefore, the identification of the position of the reservoir layer see the salt bloom has great significance on the optimization of the oil test layer section and the accurate implementation of the gas reservoir scale.
The application provides a method and a device for identifying the position of salt frost, which can effectively identify the position of salt frost in a reservoir, and play an irreplaceable promotion role in geological exploration, oil gas scale evaluation and oil gas exploitation.
The method for identifying the salt frost position is suitable for geological background covered with the cream salt rock cover layer on the reservoir.
Fig. 1 is a schematic flow chart of an embodiment of a method for identifying a salt bloom position according to an embodiment of the present application. The execution subject of the embodiment of the application is a device for identifying a salt frost position, as shown in fig. 1, and the method for identifying a salt frost position in the embodiment comprises the following steps:
s101, in the logging process, logging porosity and logging gas saturation are obtained.
In the logging process, the logging porosity and logging gas saturation are obtained.
The logging porosity can be calculated by acoustic time difference or lithology density, the unit of logging porosity is percent, the logging gas saturation can be calculated by an Alqi formula, and the unit of logging gas saturation is percent.
In this step, each time the logging instrument collects a signal, the identification device of the salt frost position will calculate a logging porosity value and a logging gas saturation value according to the corresponding parameters collected by the logging instrument, and finally a series of points of logging porosity and logging gas saturation are obtained.
S102, establishing a logging water content curve according to logging porosity and logging gas saturation.
After S101, in this step, a log water content curve is established according to the log porosity and log gas saturation obtained in S101.
In the logging process of the logging instrument, a group of corresponding logging porosity and logging gas saturation values are obtained after each signal is acquired, a logging water content value is obtained according to each group of logging porosity and logging gas saturation values, and when logging is completed, logging water content values are connected together to obtain a logging water content curve.
In one possible implementation, a log water content curve is established according to the log porosity and log gas saturation by the formula z=k Φ (1-Sg), where Z is the log water content, K is a zone correction factor, Φ is the log porosity, and Sg is the log gas saturation.
As can be seen from the formula z=k=Φ (1-Sg), the logging water content Z is determined by the logging porosity Φ, the logging gas saturation Sg and the zone correction factor K, wherein the zone correction factor K is related to the zone construction type and construction location, and K is a fixed value for the same well, so that in the same well, the value of the logging water content is related to the logging porosity and logging gas saturation only, the logging water content is proportional to the logging porosity and inversely proportional to the logging gas saturation, i.e. the greater the porosity at the same location, the smaller the gas saturation and the higher the water content.
It will be appreciated that in this implementation, the method further comprises, prior to performing this step:
and determining the value of K according to the region construction type and the construction position.
Because of the certain difference of the identification precision when the construction types and construction positions of different areas are different, the value of K needs to be determined, and the water content is corrected through K, so that the accuracy of the identification method is improved.
In the embodiment of the application, the value of K may be determined empirically, or may be determined experimentally, which is not limited by the inventor. K is usually 1-3.
Alternatively, by creating a junction graph of the logging resistivity curve and the hydration level curve (k=1), the zone correction factor K is determined from the slope of the junction graph.
S103, determining the position corresponding to the point of the logging water content greater than the water content threshold value on the logging water content curve as the position where salt frost is precipitated in the reservoir.
In the step, the position corresponding to the point on the log water content curve where the log water content is greater than the water content threshold value is determined as the position where salt frost is precipitated in the reservoir.
The water content threshold is a parameter for defining a salt frost precipitation area and a salt frost free area, the area or position where the water content of the well logging is larger than the water content threshold is the area or position where salt frost is precipitated, the area or position where the water content of the well logging is smaller than the water content threshold is the area or position where salt frost is absent, and the area or position where the water content of the well logging is equal to the water content threshold can be determined according to practical conditions.
It is understood that, before S101, the method according to the embodiment of the present application further includes the following two steps:
(1) Determining the salt content in the reservoir.
Microscopic and abrasive experiments were performed on cores that have been retrieved downhole to analyze whether the reservoir contains salt.
Wherein the microscopic experiment may include: the cast body slice experiment and the scanning electron microscope experiment adopt absolute ethyl alcohol as a lubricating and cooling solvent in the sampling, sample preparation and analysis processes, so that certain deviation of the experiment caused by salt dissolved in water is avoided, and if crystal forms with regular shapes such as lattice shapes, honeycomb shapes and the like exist in the experimental result, the existence of salt particles in a storage layer is proved.
The grinding experiments included: and (5) grinding the core of the core-taking well, and analyzing the chloride content.
And confirming that the reservoir of the sampling core well contains salt if the microscopic experiment and the grinding experiment are both expressed as containing salt.
(2) Determining the source of salt in the reservoir.
According to actual sampling core data of drilled wells in the research area, on the basis of absolute ethyl alcohol sampling and carrying out a chlorine salt content analysis experiment, an intersection diagram of the altitude and the chlorine salt content in the research area is established by combining experimental results, and whether salt sources are top cream salt rock cover layer percolation or bottom water layer characteristics is determined according to the distribution of the chlorine salt content.
Illustratively, if the chloride salt content decreases with increasing reservoir depth, it is stated that the salt in the reservoir originates from the top, i.e., the reservoir is covered with a cream-salted cap; if the chlorine salt content increases with the depth of the reservoir, the chlorine salt content decreases and then increases, which indicates that a fault exists in the reservoir, and the chlorine salt originates from the top and the side of the fault.
The method is only suitable for geological background of the overlying paste salt rock cover layer, namely, the situation that salt lakes are deposited on a reservoir, so that the steps (1) and (2) are necessary experimental preparation before the method is implemented for identifying the position of salt frost, and the efficiency and the accuracy of identifying the position of salt frost are improved.
According to the embodiment of the application, the logging porosity and logging gas saturation are obtained in the logging process, the logging water content curve is established according to the logging porosity and logging gas saturation, the position corresponding to the point on the logging water content curve, at which the logging water content is greater than the water content threshold, is determined as the position where salt frost is precipitated in the reservoir, the position where the salt frost of the rock core is precipitated can be effectively identified, and the salt-containing region in the reservoir can be effectively identified, so that the optimization work of an oil testing interval is facilitated, and the accuracy of the implementation gas reservoir scale is improved.
Fig. 2 is a schematic flow chart of a second implementation of the method for identifying a salt bloom position according to the second embodiment of the present application. On the basis of the first embodiment, as shown in fig. 2, the method of this embodiment further includes, before S103:
s201, determining a water content threshold according to a logging curve.
The step is performed before S103, and the identification device of the salt bloom position in the step determines a threshold value of the water content according to the logging curve.
The well-logging curve refers to a curve obtained directly or indirectly according to well-logging data of a well-logging instrument in the well-logging process, such as a resistivity curve, a porosity curve and the like, wherein the resistivity curve can be directly obtained from the well-logging data, and the porosity curve is obtained by simply calculating the related well-logging data.
Note that S201 may be performed before S102 or after S102, which the inventors do not limit.
According to the method, on the basis of the first embodiment, the water content threshold is determined according to the logging curve, and as geological environments where different wells are located are possibly different, when the position of salt frost in each well is identified, the accuracy of identifying the salt frost precipitation position in a reservoir is improved by determining the water content threshold of the logging water content again.
Fig. 3 is a schematic flow chart of a third embodiment of a method for identifying a salt bloom position according to an embodiment of the present application. On the basis of the second embodiment, as shown in fig. 3, the method S201 of the present embodiment includes:
s301, respectively establishing a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation, and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve.
In the step, a first three-phase intersection plate of resistivity, acoustic time difference and porosity is established according to a logging curve, a second three-phase intersection plate of resistivity, porosity and gas saturation is established, and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity is established.
Logging is often referred to as geophysical logging. Various logging instruments manufactured by using physical principles of electricity, magnetism, sound, heat, nuclear and the like are put into a well by logging cables, so that the ground electric logging instrument can continuously record various parameters which change along with the depth along a well shaft. By means of curves representing such parameters, subsurface rock formations, such as oil, gas, water, coal, metal deposits, etc., are identified. There are nine conventional log curves: natural gamma, natural potential, borehole diameter, acoustic moveout, lithology density, compensated neutron, deep lateral resistivity, shallow lateral resistivity, micro lateral resistivity, respectively.
The resistivity can be obtained by numerical reaction of three curves of deep lateral resistivity, shallow lateral resistivity and micro lateral resistivity; the porosity can be obtained by numerical reaction of three curves of acoustic time difference, lithology density and compensated neutrons; the gas saturation can be calculated according to the resistivity and the porosity by using an Archie formula; the gas logging indication may be obtained by gas logging.
S302, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled rock core.
In the step, according to the position of salt frost precipitation of the drilled rock core, a salt frost precipitation area is determined on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate.
Because the position of the sampling core for precipitating the salt frost is known, the position of the sampling core for precipitating the salt frost is found out in the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate, and the area for locally precipitating the salt frost can be determined, so that the logging response characteristic of the area for precipitating the salt frost can be obtained.
S303, determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area.
In this step, after S302, the range of values of the logging porosity and logging gas saturation of the region where salt bloom is precipitated is determined.
And (3) obtaining a value range of logging porosity and logging gas saturation of the salt frost precipitation area by carrying out probability analysis on the logging response characteristics of the salt frost precipitation area in the step (S302).
S304, determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
In this step, according to the range of values of the logging porosity and logging gas saturation of the salt frost precipitation area, determining the water content threshold of the logging water content according to the formula z=k×Φ×1-Sg.
For example, if the area correction factor is 1, the logging porosity of the precipitated frost area obtained in S303 is greater than 8%, and the saturation of gas is less than 65%, substituting k=1, Φ=8%, sg=65% into the formula z=k Φ (1-Sg), the calculated threshold of the degree of water content is 0.028.
In the embodiment, by respectively establishing a first three-phase intersection plate with resistivity, acoustic time difference and porosity, a second three-phase intersection plate with resistivity, porosity and gas saturation, a third three-phase intersection plate with gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of a drilled rock core, determining a logging porosity and logging gas saturation value range of a salt bloom precipitation area, determining a water content threshold value of the logging water content by the formula Z=K phi (1-Sg) according to the logging porosity and logging gas saturation value range of the salt bloom precipitation area, and further improving the accuracy of identifying the position of salt bloom at a specific water content threshold value corresponding to a specific well.
Fig. 4 is a schematic structural diagram of an embodiment one of a device for identifying a salt frost position according to an embodiment of the present application. The present embodiment may be used to implement the method for identifying a salt frost location shown in any one of the embodiments of fig. 1 to 3, as shown in fig. 4, where the identifying device 40 in the present embodiment includes:
an acquisition module 41 and a processing module 42.
An acquisition module 41 is used for acquiring logging porosity and logging gas saturation during logging.
A processing module 42 for creating a log moisture level profile based on the log porosity and log gas saturation.
The processing module 42 is further configured to determine a location on the log hydration level curve corresponding to a point where the log hydration level is greater than the hydration level threshold as a location within the reservoir where salt frost is precipitated.
In one possible implementation, the processing module 42 is specifically configured to:
and establishing a logging water content degree curve according to logging porosity and logging gas saturation through a formula Z=K phi (1-Sg), wherein Z is logging water content degree, K is a region correction coefficient, phi is logging porosity, and Sg is logging gas saturation.
Optionally, the processing module 42 is further configured to:
and determining the value of K according to the region construction type and the construction position.
In another possible implementation, the processing module 42 is further configured to:
the threshold moisture level is determined from a log.
Optionally, the processing module 42 is specifically configured to:
according to a logging curve, a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation, and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established;
according to the position of salt frost precipitation of the drilled rock core, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate;
determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area;
and determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
In the embodiment of the application, the identification device 40 for setting the salt frost position comprises an acquisition module 41 and a processing module 42, wherein the acquisition module 41 is used for acquiring the logging porosity and the logging gas saturation in the logging process, the processing module 42 is used for establishing a logging water content degree curve according to the logging porosity and the logging gas saturation, and the processing module 42 is also used for determining the position corresponding to the point on the logging water content degree curve, at which the logging water content degree is greater than the water content degree threshold value, as the position for precipitating the salt frost in the reservoir, so that the position for precipitating the salt frost in the core can be effectively identified, and the salt-containing region in the reservoir can be effectively identified, thereby being beneficial to developing the optimization work of the oil testing interval and improving the accuracy of the actual gas reservoir scale.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the method embodiments described above may be performed by hardware associated with program instructions. The foregoing program may be stored in a computer readable storage medium. The program, when executed, performs steps including the method embodiments described above; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (6)
1. A method for identifying a salt bloom location, comprising:
in the logging process, acquiring logging porosity and logging gas saturation;
establishing a logging water content curve according to the logging porosity and the logging gas saturation;
determining the position corresponding to the point on the logging water content curve, where the logging water content is greater than the water content threshold value, as the position where salt frost is precipitated in the reservoir;
before determining the position corresponding to the point on the log water content curve where the log water content is greater than the water content threshold as the position where salt frost is precipitated in the reservoir, the method further comprises:
determining the threshold of the water content according to a logging curve;
the determining the threshold of the water cut from the log comprises:
according to a logging curve, a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established;
according to the position of salt frost precipitation of the drilled rock core, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate;
determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area;
and determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
2. The method of claim 1, wherein said creating a log hydration level curve from said log porosity and said log gas saturation comprises:
and establishing a logging water content curve according to the logging porosity and the logging gas saturation through a formula Z=K.phi.1-Sg, wherein Z is the logging water content, K is a region correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
3. The method of claim 2, wherein prior to establishing a log water cut curve from the log porosity and the log gas saturation by the formula Z = K x Φ (1-Sg), the method further comprises:
and determining the value of K according to the region construction type and the construction position.
4. A device for identifying a salt bloom location, comprising:
the acquisition module is used for acquiring logging porosity and logging gas saturation in the logging process;
the processing module is used for establishing a logging water content curve according to the logging porosity and the logging gas saturation;
the processing module is also used for determining the position corresponding to the point on the logging water content degree curve, where the logging water content degree is greater than the water content degree threshold value, as the position where salt frost is precipitated in the reservoir;
the processing module is further configured to:
determining the threshold of the water content according to a logging curve;
the processing module is specifically configured to:
according to a logging curve, a first three-phase intersection plate of resistivity, acoustic time difference and porosity, a second three-phase intersection plate of resistivity, porosity and gas saturation and a third three-phase intersection plate of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established;
according to the position of salt frost precipitation of the drilled rock core, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate;
determining a value range of logging porosity and logging gas saturation of a salt frost precipitation area;
and determining a water content threshold value of the logging water content according to the value range of the logging porosity and logging gas saturation of the salt frost precipitation area through the formula Z=K phi (1-Sg).
5. The apparatus of claim 4, wherein the processing module is specifically configured to:
and establishing a logging water content curve according to the logging porosity and the logging gas saturation through a formula Z=K.phi.1-Sg, wherein Z is the logging water content, K is a region correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
6. The apparatus of claim 5, wherein the processing module is further configured to:
and determining the value of K according to the region construction type and the construction position.
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| CN103867198A (en) * | 2014-04-04 | 2014-06-18 | 中国石油集团川庆钻探工程有限公司 | Method for distinguishing formation density of carbonatite natural gas reservoir |
| CN108252710A (en) * | 2018-02-26 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of method and device of determining oil reservoir water saturation |
| CN109025961A (en) * | 2018-07-26 | 2018-12-18 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Calculation method, device and the electronic equipment of shale reservoir gas saturation |
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| CN103867198A (en) * | 2014-04-04 | 2014-06-18 | 中国石油集团川庆钻探工程有限公司 | Method for distinguishing formation density of carbonatite natural gas reservoir |
| CN108252710A (en) * | 2018-02-26 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of method and device of determining oil reservoir water saturation |
| CN109025961A (en) * | 2018-07-26 | 2018-12-18 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Calculation method, device and the electronic equipment of shale reservoir gas saturation |
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