Method for extracting gravity anomaly by marine gravity survey

A gravity anomaly and gravity technology, applied in the direction of measuring the gravitational field, measuring devices, instruments, etc., can solve the problems of errors, imperfect corrections, incomplete consistency, etc.

Inactive Publication Date: 2012-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] Among them, item (1) comes with the instrument and can only be eliminated within the allowable error range stipulated when the gravimeter leaves the factory.
Items (2) to (5) all have normative cal

Method used

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  • Method for extracting gravity anomaly by marine gravity survey
  • Method for extracting gravity anomaly by marine gravity survey
  • Method for extracting gravity anomaly by marine gravity survey

Examples

Experimental program
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Embodiment Construction

[0036] Such as Figure 1~5 As shown, a method for extracting gravity anomalies in marine gravity surveys includes the following steps:

[0037] The recording interval of each parameter: 1 second.

[0038] Record parameters: survey line name, sequence number, time, and gravimeter record value.

[0039] Differential GPS matches parameters by time: the latitude and longitude of the gravimeter position.

[0040] Differential GPS matches parameters according to time: the instantaneous speed and heading of the survey ship.

[0041] The echo sounder matches parameters by time: water depth value.

[0042] Tide gauges match parameters by time: tide values.

[0043] According to the projected coordinate system required by the design, convert the latitude and longitude into Cartesian coordinates X and Y values.

[0044] According to the Cartesian coordinates X and Y values ​​of 4 seconds before and after, calculate the instantaneous speed and course of the intermediate point.

[00...

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Abstract

The invention relates to a method for extracting gravity anomaly by a marine gravity survey, which comprises the following steps: computing transient course and navigational speed, adopting right-angle coordinate data within 4 seconds to compute the course and the navigational speed at an intermediate time point, and filtering out high-frequency interference; reading a gravity meter, the navigational speed, the course, water depth and tide, firstly performing 9-point smoothing to filtering out partial high-frequency interference, and then performing correcting computation on items; extracting gravity anomaly values at 10 seconds intervals for first 9-point smoothing; extracting 10-second integral multiple of gravity anomaly values for secondary 9-point smoothing; obtaining a final result of the effective and reasonable gravity anomaly value, thus eliminating high-frequency interference and the gravity anomaly in close relationship with density distribution of earthcrust. The method provided by the invention is applied to studies such as lithosphere, earthcrust structure, oil gas accumulation, and density anomalous body.

Description

technical field [0001] The invention provides a method for extracting gravity anomalies in marine gravity investigation, which belongs to the technical field of marine gravity exploration. Background technique [0002] Gravity exploration is to observe the gravity anomaly caused by the density change of the earth's lithosphere, and study the distribution and shape of density anomalies in the lithosphere accordingly. [0003] Marine gravity exploration uses ship-borne marine gravimeters to observe gravity anomalies. It is a continuous observation method of gravity anomalies under navigation, and it is carried out under dynamic conditions. [0004] In marine gravity exploration, due to the continuous change of the attitude of the ship, the position of the gravimeter in space changes accordingly, causing the change of the recorded value of the gravimeter. This change has nothing to do with the change of lithosphere density. It is an interference error and needs to be corrected ...

Claims

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Application Information

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IPC IPC(8): G01V7/00G01V7/06
Inventor 高德章陈华根牛华伟郑军陆志宏
Owner CHINA PETROLEUM & CHEM CORP
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