Search and Discovery Article

Rock-Eval hydrogen index (HI) is often used to compare relative maturities of a source horizon across a basin. Usually, there are several measurements from the source horizon at a single well, and the mean hydrogen index is calculated, or the S2 is plotted against TOC. The slope of the best fit line through that data is used as the representative HI for that well (sometimes referred to as the ‘slope HI ’ methodology). There is a potential flaw in both these methodologies; however, that renders the calculated HI as misleading if the source horizon being examined is not relatively uniform in source quality, vertically in the stratigraphic column. From a geologic perspective, it would be unusual for the source rock quality not to vary vertically in the stratigraphic column. Organic matter input, preservation, dilution, and sediment accumulation rate typically vary in many depositional environments over the millions of years required to create a thick source rock package. Nevertheless, there are source rocks which do display remarkable source-quality uniformity from top to bottom of the stratigraphic package. We have examined source rocks from several basins where the source quality is relatively uniform over the stratigraphic column, and source rocks where the source quality varies greatly over the stratigraphic column. Methodologies to assess hydrogen index at specific wells for the se two scenarios differ. Most geoscientists may not be familiar with why a single technique is not suitable for both these scenarios, or how to correctly use hydrogen index as a relative maturation proxy in the case where source rock quality is not uniform. We will demonstrate how to determine if your source rock quality is uniform or varied relative to HI over the stratigraphic column, and how to assign a hydrogen index to the different source facies when that source rock quality is not uniform. Further we will illustrate how to estimate the original hydrogen index of the different source facies and assign each a transformation ratio. The transformation ratio is a better proxy for relative maturity, since different source facies may have different present-day hydrogen indices, but their present-day transformation ratio should be quite similar.

Show more
American Association of Petroleum Geologists (AAPG)
Explorer Article

The AAPG Annual Convention and Exhibition will feature a variety of field trips that will bookend the meeting, spanning from March 26 to April 8.

American Association of Petroleum Geologists (AAPG)
Europe Blog

Sign up for your place at this two-day Geosciences Technology Workshop (GTW) hosted by AAPG Europe at Vilnius University in the heart of the Lithuanian capital. This workshop will focus on Hydrocarbon Exploration in Lithuania and the Baltic Region and will include 12 technical themes which have been designed to help launch perspectives for increased exploration in this region.

American Association of Petroleum Geologists (AAPG)
Europe Blog

The call for abstracts deadline is quickly approaching! Submit yours by 18 September 2016 to take part in the first Geosciences Technology Workshop (GTW) ever held in Lithuania. The workshop will cover everything from European basin modelling to carbonate sedimentology and offshore developments in the Baltic Sea.

American Association of Petroleum Geologists (AAPG)
Africa Blog

Enhance your skills with this AAPG short course on Sequence Stratigraphy designed for geoscientists, geophysicists, biostratigraphers & engineers needing a fundamental understanding of the principles and applications of sequence stratigraphy.  

American Association of Petroleum Geologists (AAPG)
Learn! Blog

Come for the GTW 'Making Money with Mature Fields', and stay for a short course; either 'The Petroleum Geochemistry Toolkit for Petroleum Exploration and Development' or 'Carbonate Depositional Systems'.  All three will explore new and innovative technologies and ideas to lend increased business opportunities now and into the future.

American Association of Petroleum Geologists (AAPG)
Learn! Blog

AAPG is excited about presenting THREE Short Courses in four days! Basic Seismic Interpretation   17-18 May 2016 'Old' (pre-1958) Electric Logs: A Quick Review 19 May 2016 Quick Guide to Carbonate Well Log Analysis   20 May 2016

American Association of Petroleum Geologists (AAPG)
Explorer Director’s Corner

Have you made plans to attend ACE this year? AAPG’s 2016 Annual Convention and Exhibition (ACE) is a dedicated opportunity for our members and other professionals to get together.

American Association of Petroleum Geologists (AAPG)
Middle East Blog

This is your last chance to register for the Source Rocks of the Middle East GTW, taking place in Abu Dhabi, UAE on 25-26 January. Do not miss out this exciting workshop!

American Association of Petroleum Geologists (AAPG)
Latin America Blog

Looking for hassle free, cost-effective ways to keep your employees and your company competitive during the industry downturn? AAPG can provide you with customized in-house courses offered at reasonable rates.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Wednesday, 5 March 2014, 12:00 a.m.–12:00 a.m.

Explore three of the great wonders of the geological world. Take a guided tour of classic geological sites on the Colorado Plateau.

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Monday, 19 October 2020, 12:00 p.m.–1:30 p.m.

In this webinar, Stephen Ehrenberg will present a review of the various processes that interact to determine the wide variations in porosity found in carbonate strata containing petroleum reserves. Presentation is via Zoom on Monday 19 October at 12:00 London time.

American Association of Petroleum Geologists (AAPG)
Webinar
Virtual Webinar
Saturday, 3 October 2020, 8:00 a.m.–9:00 a.m.

Join us to hear KB Trivedi,  Petroleum Geologist, discuss the paradigm of sequence stratigraphy has it enters a new phase. Webinar will be presented via Zoom on 03 October 2020, 8:00 am CST

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 17 March 2011, 12:00 a.m.–12:00 a.m.

This e-symposium will provide information on which tools, processes, and procedures all geoscientists, engineers, and technical professionals working in shale plays need to understand and implement.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 7 November 2013, 12:00 a.m.–12:00 a.m.

This e-symposium presentation places the interpretation of deep-water turbidites discernible in 3-D seismic inversion data within a geological context.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 25 August 2011, 12:00 a.m.–12:00 a.m.

This e-symposium provides highlights of the hydraulic fracturing mechanics, analysis, and design, and is derived from a two and one-half (2-1/2) day course which is designed for drilling, completion, production engineers, engineering technicians, geologists, well-site and completion supervisors, and managers, who desire to possess a comprehensive and integral knowledge of Hydraulic Fracturing.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 28 April 2011, 12:00 a.m.–12:00 a.m.

The Niobrara Petroleum System of the U.S. Rocky Mountain Region is a major tight petroleum resource play.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 19 August 2010, 12:00 a.m.–12:00 a.m.

This presentation will show where there are cases of missing sections, but none of them can be attributed to normal faulting.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 11 November 2010, 12:00 a.m.–12:00 a.m.

This e-symposium is ideal for geologists, geophysicists, engineers and other geoscientists who are involved in gas shale exploration and production.

American Association of Petroleum Geologists (AAPG)
Online e-Symposium
Thursday, 9 December 2010, 12:00 a.m.–12:00 a.m.

The Mississippian-Devonian Bakken Petroleum System of the Williston Basin is characterized by low-porosity and permeability reservoirs, organic-rich source rocks, and regional hydrocarbon charge.

American Association of Petroleum Geologists (AAPG)
DL Abstract

As oil and gas exploration and production occur in deeper basins and more complex geologic settings, accurate characterization and modeling of reservoirs to improve estimated ultimate recovery (EUR) prediction, optimize well placement and maximize recovery become paramount. Existing technologies for reservoir characterization and modeling have proven inadequate for delivering detailed 3D predictions of reservoir architecture, connectivity and rock quality at scales that impact subsurface flow patterns and reservoir performance. Because of the gap between the geophysical and geologic data available (seismic, well logs, cores) and the data needed to model rock heterogeneities at the reservoir scale, constraints from external analog systems are needed. Existing stratigraphic concepts and deposition models are mostly empirical and seldom provide quantitative constraints on fine-scale reservoir heterogeneity. Current reservoir modeling tools are challenged to accurately replicate complex, nonstationary, rock heterogeneity patterns that control connectivity, such as shale layers that serve as flow baffles and barriers.

Show more

Request a visit from Tao Sun!

American Association of Petroleum Geologists (AAPG)
VG Abstract

The carbonate sequences that were deposited in the now exhumed Tethyan Ocean influence many aspects of our lives today, either by supplying the energy that warms our homes and the fuel that powers our cars or providing the stunning landscapes for both winter and summer vacations. They also represent some of the most intensely studied rock formations in the world and have provided geoscientists with a fascinating insight into the turbulent nature of 250 Million years of Earth’s history. By combining studies from the full range of geoscience disciplines this presentation will trace the development of these carbonate sequences from their initial formation on the margins of large ancient continental masses to their present day locations in and around the Greater Mediterranean and Near East region. The first order control on growth patterns and carbonate platform development by the regional plate-tectonic setting, underlying basin architecture and fluctuations in sea level will be illustrated. The organisms that contribute to sequence development will be revealed to be treasure troves of forensic information. Finally, these rock sequences will be shown to contain all the ingredients necessary to form and retain hydrocarbons and the manner in which major post-depositional tectonic events led to the formation of some of the largest hydrocarbon accumulations in the world will be demonstrated.

Show more

Request a visit from Keith Gerdes!

American Association of Petroleum Geologists (AAPG)

Related Interests

See Also ...