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Method for analyzing data having shared and distinct properties

A technology of characteristics and data sets, applied in the fields of electrical/magnetic detection, material analysis, material analysis through resonance, etc. for logging records, which can solve problems such as suboptimal measurement accuracy

Inactive Publication Date: 2012-05-30
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not optimal for measurement accuracy

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  • Method for analyzing data having shared and distinct properties
  • Method for analyzing data having shared and distinct properties
  • Method for analyzing data having shared and distinct properties

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Embodiment Construction

[0021] Today, an increasing number of complex NMR logging tools with multiple sensors and more complex capture sequences require new and improved inversion algorithms. The problem of combining different measurements to provide more solutions or increase reliability requires careful attention.

[0022] The most direct borehole NMR capture is a single echo train measured with a CPMG sequence (usually forming phase-alternating pairs or PAPs to address rings). This data was inverted into an amplitude distribution with respect to the transverse relaxation time T2. The problem can be written as: echo = Kernel * solution, where "echo" denotes the measured echo, "solution" is the amplitude distribution, and "Kernel" is the measured kernel matrix. The kernel includes the responses of the individual components in the amplitude distribution scaled to 1. The equation describes the measurement as a superposition of the proportional individual component responses.

[0023] If two measure...

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Abstract

The invention relates to a mehod for analyzing data with shared and distinct properties. A method to determine formation properties using two or more data sets in which the solutions corresponding to the data sets represent shared and distinct formation properties. The method analyzes the data sets and computes distributions for the shared and distinct formation properties from which the formation properties are determined.

Description

technical field [0001] This application claims priority and benefit to US Provisional Application No. 60 / 820,417, filed July 26, 2006. Background technique [0002] Such as Schlumberger's MR SCANNER TM Current generation nuclear magnetic resonance (NMR) logging tools make multiple measurements where several acquisition parameters are varied. This parameter is varied to include variations in the NMR response, which is analyzed and interpreted in terms of fluid and / or rock properties. Typically, the waiting time (WT) and echo spacing (TE) are varied. For all measurements, the train of echoes is measured, which constitutes the raw NMR signal. Analysis of the echo train decay provides the distribution of the transverse relaxation times T2. Monitoring the change in the amplitude of the echo train with different WT allows one to determine the longitudinal relaxation time T1. Similarly, changes in the decay ratio and amplitude of echo trains with different TEs allow us to meas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/32G01V3/38
CPCG01N24/081G01R33/5617G01V3/32G01V3/18G01V3/38
Inventor N·J·希顿J·A·拉维涅R·黑德勒H·N·巴奇曼
Owner PRAD RES & DEV LTD