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A method for shallow water flow detection

A seismic data and velocity technology, applied in groundwater detection/exploration, measurement devices, geophysical measurements, etc., to solve the problems of seismic superposition velocity, unsuitable pressure prediction, lack of clarity, etc.

Inactive Publication Date: 2006-09-13
WESTERNGECO LLC
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Problems solved by technology

First, the usual seismic stack velocities are often not suitable for pressure prediction since they are not rocks or propagation velocities
Second, these rates lack clarity in depth
This prevents the development of the usual crushing tendency, which renders the whole method ineffective in deep water

Method used

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  • A method for shallow water flow detection
  • A method for shallow water flow detection
  • A method for shallow water flow detection

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Embodiment Construction

[0029] Surface seismic data are useful in predicting SWF regions because surface seismic data are available before drilling begins in deepwater wells.

[0030] figure 2 A flowchart for SWF detection is given. First, the seismic data is processed to increase its stratigraphic resolution 201 . Stratigraphic resolution is the ability to distinguish and resolve stratigraphic features in seismic images. The increased resolution improves the spectrum of the seismic data and enables more efficient detection of thin sand bodies using the increased resolution.

[0031] Seismic data for use may be obtained separately for detection of SWFs, or seismic data may be obtained for different modeling purposes and reprocessed for detection of SWFs. Seismic data may be three-dimensional ("3D"), two-dimensional ("2D"), or one-dimensional ("1D") data. For example, SWF can be detected using borehole 1D data, and SWF in the drilling domain can be detected using full 3D seismic data. Seismic da...

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Abstract

The present invention presents a method for determining shallow water flow risk using seismic data. The seismic data can be processed to enhance its stratigraphic resolution by sub-sampling the seismic data to less than a two-millisecond interval. Performing a stratigraphic analysis on the seismic data and evaluating the seismic attributes of the seismic data can be used to select a control location. A pre-stack waveform inversion is applied to seismic data at a selected control location to provide an elastic model, which includes pressure-wave velocity and shear-wave velocity. The shallow water flow risk is then determined using the elastic model by comparing the pressure-wave velocity to the shear-wave velocity. A post-stack inversion can be applied on the seismic data using the elastic model to model a 3D volume to determine the shallow water flow risk across the 3D volume.

Description

technical field [0001] The present invention relates to the prediction of shallow quicksand layers using processed seismic data. Background technique [0002] Drilling wells for fossil fuels in deepwater targets is expensive and dangerous without good planning and preparation. Proper drilling planning requires reliable anticipation of hazards. One such hazard in deepwater drilling is shallow-flowing ("SWF") sand formations which are highly porous sand formations that tend to flow while drilling. If deepwater drilling penetrates these SWF layers, the sand layer can flow and cause damage to the borehole and the drilling site. SWF formations have cost the oil industry millions of dollars to date, therefore, detection of SWF formations is important to reduce both economic losses and environmental hazards. [0003] figure 1 The generally understood formation of SWF is shown. SWF sand layers typically occur in water depths between 300m and 600m below the mud line 101 . Soft ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/32G01V9/02G01V1/00
CPCG01V1/32G01V1/282G01V1/288G01V9/02Y02A90/30
Inventor 纳德尔·都塔萨布哈施斯·迈利克
Owner WESTERNGECO LLC
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