High Density

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The Purpose of High Density Surveys

The acquisition of high density surveys is a growing trend in land seismic acquisition as E&P companies realize their advantages for achieving higher resolution and improved data quality. The combination of full-fold, full-offset, and wide azimuth imaging helps to locate and characterize natural fractures in tight gas-centered basins, or improves noise attenuation to help solve the complexity of deeper structures with more accuracy. High density sampling is a key component of broadband acquisition to achieve the higher frequencies.

Advancements in seismic technology enable crews to acquire surveys at very tight interval spacing. The challenge for E&P companies and their seismic acquisition partners is achieving a balance of cost and quality. Without significantly adding to the cost or introducing burdensome operational inefficiencies, the project must deliver high quality, high resolution data capable of adequately imaging the target. To gain a competitive edge, the goal is acquisition of more data for incrementally less cost.

 

 

The INOVA Solution

A high density solution demands flexibility and operational efficiency from the acquisition technology to meet the rigorous and changing requirements on a wide range of projects. INOVA’s industry-leading innovation translates to ease of field operation, balancing the limitations on people and resources, so that a high spatial density of sources and receivers can be deployed, acquired and demobilized in the shortest time at the lowest possible cost without sacrificing data quality.

The flexible equipment accommodates group intervals configured up to a third smaller than the standardized cable lengths. Using INOVA’s AccuSeis digital sensor, operators can acquire a trace density up to three times as dense with the same group interval. As the lightest and smallest digital sensor on the market, AccuSeis SL11 incorporates world-class MEMS sensor technology with ultra-low 85mW power consumption and 2-wire telemetry in a rugged case that can withstand the rigor of high-density acquisition operations.

The table below illustrates two possible scenarios for equipment deployment. The high density deployment on the right utilizes less equipment than a standard deployment to accomplish half the group interval with only half the ground electronics. This scenario delivers an increased density of nearly 100% with 3000 fewer RAMs. Both scenarios use the G3i and the AccuSeis sensor, configured 3 sensors per string.

Figure 1. Properties of the AccuSeis sensor

Acquisition
Parameters

Standard
Deployment

High Density Deployment -
Increased Density by 100%

# Channels per line

860

1405

Active lines

28

28

Spread type

Orthogonal

Orthogonal

Nominal channels live

24080

39340

Receiver interval

30 meters

18.3 meters

Receiver line interval

480 meters

480 meters

Source interval

30 meters

30 meters

Source line interval

480 meters

480 meters

Nominal fold (with a bin size)

15 meters

9.15 x 15 meters

Trace density

41.2 receivers / sq km

77.1 receivers / sq km

Remote acquisition units (rams)

6665

3658

The INOVA solution gives contractors a competitive edge with both cost and flexibility in acquiring high density surveys while meeting the rigorous technical requirements of oil company customers to achieve a better understanding of the complexities of the subsurface.

 

 

Unmatched Vibrator and Controller Technologies

  • AHV-IV Commander (PLS-364) – INOVA’s most advanced vibroseis vehicle can consistently generate 70% of the maximum peak force of 61,800 lbs in a frequency range of 1 Hz to 250 Hz, and includes design innovations such as a new baseplate that is 2.5 times stiffer than conventional baseplates.
  • UNIVIB (PLS-326) and UNIVIB 2 (PLS-334) – INOVA’s newest vibrator is a smaller, lighter and more mobile version of the AHV-IV vehicle, but with the same quality and reliability for generating source points.
  • Vib Pro and Vib Pro HD - Custom electronics, including the patented Harmonic Distortion Reduction (HDR™) technology, enable vibrators to generate more accurate sweeps, provide highly precise source signatures and allow crews to efficiently manage vibrator fleet operations.

 

World’s Most Flexible Recording Technologies

  • G3i HD Cabled Acquisition System – INOVA’s premier mega-channel recording system with fiber-optic baselines and advanced ground electronics, the G3i HD system supports up to 240,000 channels and can capture seismic data from simple 2D to complex, high density 3D surveys.
  • Hawk Autonomous Nodal System – For operators looking to acquire high-density seismic data in areas where cable-based systems are impractical, INOVA offers Hawk—the industry’s most flexible nodal recording system.

 

Best-in-Class Sensing Technologies

  • AccuSeis Digital Sensor - INOVA’s newest sensor for acquiring single component seismic data digitally. The sensor offers excellent operational advantages over competing technologies, especially suited for high-density imaging as the smallest and lightest digital sensor in the industry.
  • VectorSeis Digital Sensor - For imaging complex subsurface structures such as fractured shales, tight sands and other unconventional plays, INOVA’s VectorSeis multicomponent digital sensor leads the field in capturing the full seismic wavefield.