Integrated seismic

Value in a Team Effort

American Association of Petroleum Geologists (AAPG)

Despite the huge volumes of oil and gas being produced from shale deposits, there’s still much to learn about these unconventional reservoirs, which have the added role of being source rocks.

They persist in challenging even the most experienced geoscientists and operators.

Unfortunately, quantitative seismic interpretation workflows continue to be immature for these reservoirs, compared to carbonates and clastics.

“With unconventional shale gas and oil, you have to know the rock quality, whether the rock is brittle or not in order to fracture the reservoir,” said Gabino Castillo, North America services and software manager at CGGVeritas in Houston.

“Also,” he continued, “if it’s brittle, we need to know how the fractures will propagate.”

Surface seismic data and microseismic data both are key assets for many companies producing from unconventional resource plays.

And there’s good news in that recent advances in pre-stack seismic data analysis yield attributes that appear to correlate to lithology, rock strength and stress fields in the formation, according to Castillo.

“Knowledge and proper utilization of these attributes may prove valuable in the optimization of drilling and completion activities,” he said.

Tweaking With Purpose

Castillo has been involved in a number of projects to hone his expertise in the newest techniques to characterize and understand unconventional reservoirs. Much of this work has focused on the well-known Haynesville shale gas play in North Louisiana.

Evolving out of this study effort is an integrated seismic approach based on pre-stack azimuthal seismic data analysis, microseismic and well log information to identify sweet spots, estimate geomechanical properties and in-situ principal stresses.

With a tweak or two, the technology approach garnered from the studies can be applied to other formations – given that the challenges to be resolved are the same, more or less.

“The weight we put on each individual technology is different,” Castillo said. “Sometimes the most important is TOC, sometimes brittleness, sometimes fracing – it depends on the case.”

He noted the importance of properties such as Young’s Modulus (measure of elasticity of a rock or other material) and Poisson’s Ratio (measure of how a rock is going to deform in one area relative to another).

“These may provide valuable information for facies identification, mineral content and rock strength,” Castillo emphasized. “From these, we may infer preferential sweet spots.”

He gives high marks to the opportunity for validation and calibration of the work.

“We have inversion, all the elastic attributes, anisotropy, etcetera, etcetera,” he noted. “The one piece that was always missing before was the validation, calibration, the microseismic.

“I had microseismic data, cuttings, SEM mineralogy analysis. So I had textural mineralogical data we used to estimate brittleness, which is useful for well completions,” Castillo said. “We had the opportunity to calibrate all the seismic properties with hard data.

“On top of that, with microseismic data I found interesting correlations between size of the stimulated reservoir volume and Young’s Modulus,” he added. “So I found a positive correlation in that.”

Putting It Together

Castillo assembled a summary sketch of the key ingredients for shale reservoir characterization.

“Integration between surface seismic, microseismic data, mineralogy, production data – how to put everything together – is essential for unconventional reservoir characterization,” he said.

He elaborated further.

“The way I see it, you have seismic data and it gives you pre-stack inversion, azimuthal attributes, fractures.

“From the microseismic you have location of event, magnitude and the stimulated reservoir volume.

“With the mineralogy, you have reservoir quality, geomechanical properties.

“Using production data, you have, for example, sweet spot maps, which are really important.

Comments (0)

 

What Can I Do?

Add Item

Enter Notes:
 
* You must be logged in to name and customize your collection.
Recommend Recommend
Printable Version Printable Version Email to a friend Email to a friend

Meet the Presenter

Gabino Castillo, North America services and software manager at CGGVeritas in Houston, will present the paper “Integrated Seismic Approach and Key Technologies for Shale Gas Characterization,” at this month’s AAPG International Conference and Exhibition in Cartagena, Colombia.

The paper will be presented at 10:50 a.m. Wednesday, Sept. 11.

Castillo also is a co-chair, with Gervasio Barzola of Pioneer Natural Resources, of an, AAPG/EMD session titled “Unconventional Resources: Evaluation Tools and Methodologies.” That morning session will begin at 8:30 a.m. Tuesday, Sept. 10.

Emphasis: Geophysical Review

Explorer Emphasis Article Equipment arrives for earthquake aftermath Canadian Crews Survey Christchurch Faults Canadian Crews Survey Christchurch Faults Desktop /Portals/0/PackFlashItemImages/WebReady/lawton-don.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2631
Explorer Emphasis Article Template matching technique is timely Ohio Experiences Fuel Award-Winning Paper Ohio Experiences Fuel Award-Winning Paper Desktop /Portals/0/PackFlashItemImages/WebReady/Explorer-Cover-2013-09sep-thumb.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2621
Explorer Emphasis Article Cooperation with the community Pastoral French Setting Adds a Taste of Seismic Pastoral French Setting Adds a Taste of Seismic Desktop /Portals/0/PackFlashItemImages/WebReady/pastoral-french-setting-adds-a-taste-of-seismic-2013-09sep-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2632
Explorer Emphasis Article Po Seismic Gets Hybrid Approach Po Seismic Gets Hybrid Approach Desktop /Portals/0/PackFlashItemImages/WebReady/Explorer-Cover-2013-09sep-thumb.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2633
Explorer Emphasis Article What is hydraulic fracturing’s role? Scientists Look Deeper Into Induced Seismic Scientists Look Deeper Into Induced Seismic Desktop /Portals/0/PackFlashItemImages/WebReady/scientists-look-deeper-into-induced-seismic-2013-09sep-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2620
Explorer Emphasis Article Impulsive seismic Second Time’s a Charm Second Time’s a Charm Desktop /Portals/0/PackFlashItemImages/WebReady/second-times-a-charm-2013-09sep-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2627
Explorer Emphasis Article ‘Geology Without Limits’ Seismic Project Sets Caribbean Investigation Seismic Project Sets Caribbean Investigation Desktop /Portals/0/PackFlashItemImages/WebReady/seismic-project-sets-caribbean-investigation-2013-09sep-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2629
Explorer Emphasis Article The quest for hydrocarbons continues Seismic Provides New Look at Trinidad Geology Seismic Provides New Look at Trinidad Geology Desktop /Portals/0/PackFlashItemImages/WebReady/Explorer-Cover-2013-09sep-thumb.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 2630

See Also: Industry Meeting Abstract Submission

Industry Meeting Abstract Submission AAPG/EAGE/MGS 3rd Oil & Gas Myanmar Geosciences Conference - Call for Abstracts AAPG/EAGE/MGS 3rd Oil & Gas Myanmar Geosciences Conference - Call for Abstracts Desktop /Portals/0/PackFlashItemImages/WebReady/AAPG-EAGE-MGS-Myanmar-Geosciences-Conference-Hero-v2.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 30076

See Also: Workshop Program Paper

Workshop Program Paper Making Money with Mature Fields Improving Connectivity in Oil & Gas Wells with Electro-Hydraulic Stimulation Improving Connectivity in Oil & Gas Wells with Electro-Hydraulic Stimulation Desktop 33873

See Also: Book

Book MTH10 - Development Geology Reference Manual MTH10 - Development Geology Reference Manual Desktop /remote/store-assets.aapg.org/img/products/meth10bookcdpc612.jpg?width=50&height=50&mode=pad&bgcolor=white&quality=90amp;encoder=freeimage&progressive=true&scale=both 4361

See Also: DL Abstract

DL Abstract Indian National Gas Hydrate Program Expedition 02 Technical Contributions Indian National Gas Hydrate Program Expedition 02 Technical Contributions Desktop /Portals/0/PackFlashItemImages/WebReady/dl-indian-national-gas-hydrate-program-expedition-02-technical-contributions-hero.jpg?width=100&h=100&mode=crop&anchor=middlecenter&quality=75amp;encoder=freeimage&progressive=true 32854