CN-122026089-A - Logging detector and measuring method

CN122026089ACN 122026089 ACN122026089 ACN 122026089ACN-122026089-A

Abstract

The invention provides a logging detector and a measuring method, and belongs to the technical field of logging. The logging detector comprises an antenna assembly, the antenna assembly comprises a first antenna unit and a second antenna unit, the first antenna unit comprises a first radiation patch, a first feed port and a plurality of first impedance matching circuits, the first radiation patch and the first feed port are arranged on a first multilayer circuit board, the plurality of first impedance matching circuits are respectively connected with the first radiation patch and the first feed port, the first feed port is used for sending or receiving feed signals in a first polarization direction, the second antenna unit comprises a second radiation patch, a second feed port and a plurality of second impedance matching circuits, the second radiation patch and the second feed port are arranged on a second multilayer circuit board, the plurality of second impedance matching circuits are respectively connected with the second radiation patch and the second feed port, the second feed port is used for sending or receiving feed signals in a second polarization direction, and the first radiation patch and the second radiation patch are mutually orthogonal and form a T shape. The broadband dual-polarization logging detector has the advantages of miniaturization, high polarization purity and high antenna port surface utilization rate.

Inventors

HE QIULI
LI ANZONG
CHEN WENHUI
SUN QILING
YANG ZHE
LU CHUNLI
SUN QINTAO
CHENG YUQI

Assignees

中国石油天然气集团有限公司
中国石油集团测井有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. A logging sonde comprising a plurality of antenna assemblies disposed on a first base, the antenna assemblies including a first antenna unit and a second antenna unit; The first antenna unit comprises a first radiation patch, a first feed port and a plurality of first impedance matching circuits which are arranged on the first multilayer circuit board and are respectively connected with the first radiation patch and the first feed port in a radio frequency mode, and the first feed port is used for sending or receiving feed signals in a first polarization direction; The second antenna unit comprises a second radiation patch, a second feed port and a plurality of second impedance matching circuits which are arranged on the second multilayer circuit board and are respectively connected with the second radiation patch and the second feed port in a radio frequency mode, and the second feed port is used for sending or receiving feed signals in a second polarization direction; The first radiation patch and the second radiation patch are mutually orthogonal and form a T shape, and the first polarization direction and the second polarization direction are mutually orthogonal.
2. The well logging detector of claim 1, wherein the antenna assembly further comprises a first matching circuit board, a first radio frequency port and a third impedance matching circuit connected with the first feed port and the first radio frequency port in a radio frequency manner are arranged on the first matching circuit board, and the first radio frequency port is used for sending or receiving feed signals in a first polarization direction.
3. The well logging detector of claim 2, wherein the antenna assembly further comprises a second matching circuit board, a second radio frequency port and a fourth impedance matching circuit connected with the second feed port and the second radio frequency port in a radio frequency manner are arranged on the second matching circuit board, and the second radio frequency port is used for transmitting or receiving feed signals in a second polarization direction.
4. A logging sonde according to any one of claims 1-3 wherein the antenna assembly is integrally provided on the first base.
5. The well logging detector of claim 1 wherein the feed signal of the first polarization direction is a horizontal polarization direction feed signal and the feed signal of the second polarization direction is a vertical polarization direction feed signal.
6. The well logging detector of claim 1, further comprising a radome, wherein the radome is provided with a plurality of metal cavities having an open end, each antenna assembly is disposed in each metal cavity in a one-to-one correspondence manner, each metal cavity bottom wall is provided with a first slit which is diametrically opposite to the first radiation patch in the corresponding antenna assembly and penetrates through the thickness direction of the metal cavity bottom wall, and each metal cavity bottom wall is provided with a second slit which is diametrically opposite to the second radiation patch in the corresponding antenna assembly and penetrates through the thickness direction of the metal cavity bottom wall.
7. The well logging detector of claim 1, wherein the first multi-layer circuit board comprises a first circuit carrier and a second circuit carrier arranged in a stacked manner, the first radiation patch is arranged on a surface of the first circuit carrier away from the second circuit carrier, the first impedance matching circuit and the first feed port are arranged on the second circuit carrier, the first radiation patch is connected with a first end of the first impedance matching circuit via a first strip line, and a second end of the first impedance matching circuit is connected with the first feed port via a first radio frequency interconnect.
8. The well logging detector of claim 1, wherein the second multi-layer circuit board comprises a third circuit carrier board and a fourth circuit carrier board arranged in a stacked manner, the second radiation patch is arranged on a surface of the third circuit carrier board far away from the fourth circuit carrier board, the second impedance matching circuit and the second feed port are arranged on the fourth circuit carrier board, the second radiation patch is connected with a first end of the second impedance matching circuit via a second strip line, and a second end of the second impedance matching circuit is connected with the second feed port via a second radio frequency interconnect.
9. A method of measuring a dielectric constant of a reservoir, comprising: Pushing the logging detector against the wall of the target interval of the borehole; Sending a first control signal to the logging detector, so that each subarray in the logging detector sends electromagnetic waves with own corresponding frequency and polarization direction to the stratum in a time-sharing mode according to the measurement time sequence and receives the electromagnetic waves with own corresponding frequency and polarization direction after being propagated through the stratum; Inversion is carried out on the electromagnetic wave propagated by the stratum to obtain dielectric constant data of the target interval.
10. A method of reservoir resistivity measurement, comprising: Pushing the logging detector against the wall of the target interval of the borehole; Sending a first control signal to the logging detector, so that each subarray in the logging detector sends electromagnetic waves with own corresponding frequency and polarization direction to the stratum in a time-sharing mode according to the measurement time sequence, and receives the electromagnetic waves with own corresponding frequency and polarization direction after being propagated through the stratum; Inversion is carried out on the electromagnetic wave propagated by the stratum to obtain the resistivity data of the target interval.

Description

Logging detector and measuring method Technical Field The invention belongs to the technical field of geophysical well logging, and particularly relates to a well logging detector, a reservoir dielectric constant measuring method and a reservoir resistivity measuring method. Background Dielectric logging technology utilizes the significant difference of the dielectric constants of oil, gas and water in reservoirs to realize fluid identification and petrophysical information description of the reservoirs, and has become one of effective logging technologies for complex reservoir evaluation. The dielectric logging detector is used as a key component for receiving and transmitting electromagnetic waves and is the core of instrument development. Since the last 70 th century, many oilfield service companies have introduced dielectric logging tools in the form of logging probes, mainly tens of mhz phase dielectric logging tools in the form of coils, gigahertz high frequency dielectric logging tools with back cavity slot antennas, and dielectric scanning logging tools of tens of mhz to gigahertz with cross-array and back cavity structures. The research shows that the coil form and the back cavity type slot antenna can only realize single-frequency point measurement, and the antenna port surface utilization rate and the cross polarization purity of the cross array and the back cavity type structure are low. How to realize high polarization purity and high space utilization of a broadband dual-polarized antenna is a challenge in the design of a logging detector. Meanwhile, the logging sonde is typically placed in a small space downhole, e.g., it is typically located on an eccentric or a thrust arm of a downhole device, and is measured against the borehole wall. The antenna of the existing logging detector is an electric small antenna limited by the narrow space of the leaning device, the radiation efficiency of the antenna is low, and the impedance matching of the antenna with specific frequency and the transmission line is realized through an impedance matching circuit. For a broadband dual-polarized logging detector, an impedance matching module with multiple frequency points is needed. It can be seen how to realize a broadband dual polarization logging detector with high polarization purity and high space utilization, which is applicable to the limited space of an eccentric or a leaning arm, is the key content of research in the technical field. Disclosure of Invention The invention aims to provide a well logging detector, a reservoir dielectric constant measuring method and a reservoir resistivity measuring method, which are used for overcoming the defects of low antenna port utilization rate and low cross polarization purity of a broadband dual-polarized dielectric well logging detector formed by antenna units such as cross array and back cavity structures in the prior art. To achieve the above object, a first aspect of an embodiment of the present invention provides a logging sonde, including a plurality of antenna assemblies disposed on a first base, the antenna assemblies including a first antenna unit and a second antenna unit; The first antenna unit comprises a first radiation patch, a first feed port and a plurality of first impedance matching circuits which are arranged on the first multilayer circuit board and are respectively connected with the first radiation patch and the first feed port in a radio frequency mode, and the first feed port is used for sending or receiving feed signals in a first polarization direction; The second antenna unit comprises a second radiation patch, a second feed port and a plurality of second impedance matching circuits which are arranged on the second multilayer circuit board and are respectively connected with the second radiation patch and the second feed port in a radio frequency mode, and the second feed port is used for sending or receiving feed signals in a second polarization direction; The first radiation patch and the second radiation patch are mutually orthogonal and form a T shape, and the first polarization direction and the second polarization direction are mutually orthogonal. Optionally, the antenna assembly further includes a first matching circuit board, a first radio frequency port and a third impedance matching circuit connected with the first feed port and the first radio frequency port in radio frequency are disposed on the first matching circuit board, and the first radio frequency port is used for sending or receiving a feed signal in a first polarization direction. Optionally, the antenna assembly further includes a second matching circuit board, and a second radio frequency port and a fourth impedance matching circuit connected with the second feed port and the second radio frequency port in radio frequency are disposed on the second matching circuit board, and the second radio frequency port is used for transmitting or receiving a feed signal in