CN-122018031-A - Reservoir fluid identification method and device, electronic equipment and medium

CN122018031ACN 122018031 ACN122018031 ACN 122018031ACN-122018031-A

Abstract

The application discloses a reservoir fluid identification method, a device, electronic equipment and a medium, which are applied to the field of sandstone reservoirs. The method comprises the steps of obtaining original conventional data and reservoir density of a reservoir corresponding to logging to be detected, determining an original curve corresponding to the original conventional data, correcting the original curve based on the specification of the correction curve to obtain a corrected curve, determining neutron-acoustic wave envelope area formed by neutron data and acoustic wave data in the original conventional data according to the corrected curve, and judging fluid types corresponding to the reservoir according to reservoir density and neutron-acoustic wave envelope area based on reservoir fluid identification judgment criteria. According to the application, the type of the reservoir fluid is judged by comprehensively analyzing the two parameters of the neutron-acoustic wave envelope area and the reservoir density, the parameters are not influenced by factors such as the formation resistivity and the like and human factors, the reservoir fluid property can be accurately, rapidly and intuitively judged, and the accuracy of judging the reservoir fluid is improved.

Inventors

YANG LIHUA
ZHAO WEIXIANG
ZHANG YANPEI
JING TAO
Zong Ran
WU MINGJIAN
ZHAO XIUYING
ZHANG JI
MA LIFENG

Assignees

中国石油化工集团有限公司
中石化石油工程技术服务股份有限公司
中石化经纬有限公司
中石化经纬有限公司中原测控公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. A method of reservoir fluid identification, comprising: Acquiring original conventional data and reservoir density of a reservoir corresponding to logging to be measured, and determining an original curve corresponding to the original conventional data; performing correction processing on the original curve based on the correction curve specification to obtain a correction curve; determining neutron-acoustic wave envelope areas formed by neutron data and acoustic data in the original conventional data according to the correction curve; and judging the fluid type corresponding to the reservoir according to the reservoir density and the neutron-acoustic envelope area based on reservoir fluid identification judgment criteria.
2. The reservoir fluid identification method of claim 1, wherein obtaining raw conventional data of a reservoir corresponding to a well to be measured and determining a raw curve corresponding to the raw conventional data comprises: Acquiring the original conventional data of the reservoir; Based on standard data specification, carrying out standardization processing on the original conventional data to obtain standard conventional data; sorting the standard conventional data according to the depth sorting requirement to obtain sorting data; And determining the original curve according to the sorting data.
3. The reservoir fluid identification method according to claim 1, wherein the correcting the original curve based on the correction curve specification to obtain a corrected curve comprises: Acquiring historical conventional data of at least one logging corresponding reservoir; Determining the calibration curve specification according to the historical conventional data and the fluid type of the reservoir in the well logging; And correcting the original curve based on the correction curve specification to obtain the corrected curve.
4. The reservoir fluid identification method of claim 1, wherein determining a neutron-acoustic envelope area composed of neutron data and acoustic data in the raw conventional data from the calibration curve comprises: acquiring a neutron curve representing the neutron data in the correction curve; acquiring an acoustic wave curve representing the acoustic wave data in the correction curve; And determining the neutron-acoustic wave envelope area corresponding to the neutron curve and the acoustic wave curve based on an envelope area formula.
5. The reservoir fluid identification method of claim 1, wherein the determining the fluid type corresponding to the reservoir based on the reservoir fluid identification criteria based on the reservoir density and the neutron-acoustic envelope area comprises: When the reservoir density is smaller than a first density threshold and the neutron-acoustic envelope area is not smaller than a first area threshold, judging that the reservoir is a gas layer currently; And when the reservoir density is not less than the first density threshold and is less than a second density threshold, the neutron-acoustic envelope area is not less than a second area threshold and is less than the first area threshold, determining that the reservoir is currently a differential gas layer.
6. The method of claim 5, wherein the determining the type of fluid corresponding to the reservoir based on the reservoir fluid identification criteria based on the reservoir density and the neutron-acoustic envelope area further comprises: When the reservoir density is not greater than the second density threshold, the neutron-acoustic envelope area is not less than a third area threshold and is less than the second area threshold, determining that the reservoir is currently a gas-bearing layer; and when the neutron-acoustic wave envelope area is smaller than the third area threshold value, judging that the reservoir is a dry layer.
7. The reservoir fluid identification method of any of claims 1-6, wherein the scale of the neutron data is in the range of 0% -80%, the scale of the reservoir density is in the range of 1.2g/cm 3 -2.8g/cm 3 , and the scale of the acoustic data is in the range of 591 μs/m-131 μs/m.
8. A reservoir fluid identification device, comprising: The acquisition module is used for acquiring original conventional data of a reservoir corresponding to the well logging to be detected and the reservoir density, and determining an original curve corresponding to the original conventional data; the processing module is used for carrying out correction processing on the original curve based on the correction curve specification so as to obtain a correction curve; The determining module is used for determining neutron-sound wave envelope area formed by neutron data and sound wave data in the original conventional data according to the correction curve; And the judging module is used for judging the fluid type corresponding to the reservoir according to the reservoir density and the neutron-acoustic envelope area based on reservoir fluid identification judging criteria.
9. An electronic device comprising a memory for storing a computer program; A processor for implementing the steps of the reservoir fluid identification method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the reservoir fluid identification method according to any of claims 1 to 7.

Description

Reservoir fluid identification method and device, electronic equipment and medium Technical Field The application relates to the field of sandstone reservoirs, in particular to a reservoir fluid identification method, a device, electronic equipment and a medium. Background The Alqi formula is that the sandstone reservoir calculates the oil saturation by using logging data, and judges that the current reservoir is the basis of a gas layer, a poor gas layer and the like. But the effect becomes worse when the formula is used in argillaceous sandstones, low-resistance reservoirs and complex pore reservoirs. The method is characterized in that parameters related to an Arch formula comprise rock cementation indexes, lithology coefficients related to lithology, saturation indexes, constants related to rock samples, formation water resistivity, formation resistivity, reservoir porosity and the like, wherein the rock cementation indexes of different layers, the lithology coefficients related to lithology, the saturation indexes and the constants related to the rock samples are different, the formation water resistivity changes along with depth and temperature, the formation resistivity changes along with the invasion of slurry, that is, the rock cementation indexes, the lithology coefficients related to lithology, the saturation indexes, the constants related to the rock samples, the formation water resistivity and the formation resistivity have great uncertainty, and the reservoir porosity is basically accurate, so that the hydrocarbon saturation of a tight sandstone reservoir is calculated by adopting the Alqi formula, and the type of the current reservoir is judged with lower accuracy. In view of the above, it is a urgent need for a reservoir fluid identification method. Disclosure of Invention The application aims to provide a reservoir fluid identification method, a device, electronic equipment and a medium. The accuracy of judging the current reservoir fluid type in the prior art can be improved. In order to solve the technical problems, the application provides a reservoir fluid identification method, which comprises the following steps: Acquiring original conventional data and reservoir density of a reservoir corresponding to logging to be measured, and determining an original curve corresponding to the original conventional data; performing correction processing on the original curve based on the correction curve specification to obtain a corrected curve; Determining neutron-acoustic wave envelope area formed by neutron data and acoustic wave data in original conventional data according to a correction curve; Based on reservoir fluid identification judgment criteria, judging the fluid type corresponding to the reservoir according to the reservoir density and neutron-acoustic envelope area. Preferably, obtaining original conventional data of a reservoir corresponding to a well to be measured, and determining an original curve corresponding to the original conventional data, including: Acquiring original conventional data of a reservoir; Based on standard data specification, carrying out standardization processing on the original conventional data to obtain standard conventional data; sorting the standard regular data according to the depth sorting requirement to obtain sorting data; the original curve is determined from the ranking data. Preferably, the correction processing is performed on the original curve based on the correction curve specification to obtain a corrected curve, including: Acquiring historical conventional data of at least one logging corresponding reservoir; Determining a calibration curve specification according to historical conventional data and the fluid type of a reservoir in the well logging; And correcting the original curve based on the correction curve specification to obtain a corrected curve. Preferably, determining a neutron-acoustic envelope area formed by neutron data and acoustic data in the original conventional data according to the correction curve includes: acquiring a neutron curve representing neutron data in the corrected curve; acquiring an acoustic wave curve representing acoustic wave data in a corrected curve; And determining neutron-acoustic wave envelope areas corresponding to the neutron curve and the acoustic wave curve based on an envelope area formula. Preferably, based on reservoir fluid identification judgment criteria, judging the fluid type corresponding to the reservoir according to the reservoir density and neutron-acoustic envelope area, including: When the density of the reservoir is smaller than a first density threshold value and the neutron-acoustic envelope area is not smaller than a first area threshold value, judging that the current reservoir is a gas layer; And when the density of the reservoir is not less than the first density threshold and is less than the second density threshold, and the neutron-acoustic envelope area is not less than t