EGI at AAPG ACE 2017

Come visit EGI in the Exhibit Hall and join EGI speakers presenting at this year’s event

As AAPG celebrates its 100th anniversary, EGI is proud to celebrate our 45th year of high-caliber energy science. Please join us as we host booth #1613 in the Main Exhibit Hall at the AAPG ACE 2017 Conference & Exhibition. Come see what EGI has to offer and learn about your benefits as a member of EGI, including research services, training, expert capabilities, and our Global On-line Database EGIconnect. EGI experts Lans Taylor, David Thul, Matthias GrebElinda McKenna, and EGI Director Raymond Levey, will be present at the EGI booth in the Expo Hall at alternating times throughout the Conference.

For 45 years, EGI has served the upstream E&P energy industry, bringing our members the science to inspire new ideas to explore for and produce the Earth’s energy resources. EGI delivers high quality research, knowledge, and data to solve subsurface problems in global collaboration with academic, industry, and government organizations.

EGI scientists presenting at AAPG ACE 2017:

2 April

Rasoul Sorkhabi

Location & Time: General Assembly A, 1:20 p.m.
Session: History of Petroleum Geology

Lewis G. Weeks and the “Oil Habitat” Paradigm in Petroleum Geology


In March 1955, a symposium titled “Habitat of Oil” was held by the AAPG during its annual convention in New York. The proceedings volume of this symposium, edited by Lewis G. Weeks (1893-1977), was published in 1958. The symposium and its 1300-page publication marked the integration and culmination of the three previous paradigms in petroleum exploration, namely, the “anticline” theory, the “economic distribution” analysis, and the “subsurface entrapment” geology. Taking the Oil Habitat publication as a point of departure, this paper reviews how the previous three previous paradigms in petroleum geology developed and eventually led to the concept of “Oil Habitat.” Furthermore, it is argued that Lewis Weeks’ opening paper titled “Habitat of oil and some factors that control it” heralded the era of systematic exploration that later came to be called the “petroleum system” analysis. The Oil Habitat paradigm described in the 1958 AAPG publication thus marked a transition between two major periods of geologic thinking in petroleum exploration, namely pre-1950s and post-1960s. The significant of “oil habitat” analysis has not diminished with the rise of the so-called unconventional shale plays because it is still crucial to locate the generative aspects and productive sweet spots of these self-sourced reservoirs.

3 April – morning

Shu Jiang

Shu Jiang, Xianglu Tang, Zhenxue Jiang, Lei Chen, Shengxiang Long, Zhiliang He
Location & Time: General Assembly A, 9:25 a.m.
Session: Unconventional: Advances in Mudstone and Organic Matter Depositional Processes (EMD/AAPG)

The Effects of Reservoir Heterogeneity on Shale Gas Accumulation and Production – Case Study From Ordovician Wufeng-Silurian Longmaxi Marine Shale in the Sichuan Basin, China


Heterogeneous nature of the Ordovician Wufeng-Silurian Longmaxi shale reservoir in the Sichuan Basin in China is characterized through the analysis organic matter content (TOC), mineral content, porosity, permeability, in situ gas content, natural fractures, and beddings based on the detailed core description and lab measurements. The qualitative and quantitative methods for heterogeneity characterization are proposed to systematically study the shale heterogeneity within the sequence stratigraphic framework. The normalized shale heterogeneity index (SHI) is employed to quantitatively characterize the variations of key shale properties in time and space and the shale resource index (SRI) is adopted to gauge the shale gas accumulation. Statistics of the tested data indicates that the TOC plays the most important role in the SHI among the geochemistry, mineralogy, petrophsyics, sedimentation, and structure properties. Pearson Correlation statistics reveals the positive relationship between in situ gas content and TOC, porosity, and permeability and negative relationship between in situ gas content and clay content and bedding frequency. The moderate density of natural fractures will be favorable for shale gas accumulation, while the absence of natural fractures and abundant natural fractures will be unfavorable for shale gas accumulation. The TOC has the highest weigh value among they key reservoir properties influencing the shale gas accumulation. The transgressive systems tract (TST) with high TOC, high biogenic quartz content, high porosity and permeability is more favorable for gas accumulation. The SHII, SRI, and shale gas production rate generally have positive relationships and they all decrease from the tectonically stable area inside the Sichuan Basin to tectonically active area outside the basin, which implies that the heterogeneity has positive effects on shale gas accumulation and production and tectonic activities result in the disruptions of shale gas accumulation and decrease in production.

3 April – afternoon

Shu Jiang

Shu Jiang, Dianshi Xiao, Xianglu Tang, Qin Zhang, Fengcun Xing, Caifu Xiang, Peter Pahnke, Tomas Anderson
Location & Time: Exhibit Hall D-E, 1:30 p.m.
Session: Poster; Theme 6: Unconventional: New Technologies and New Concepts in Unconventionals II (EMD/AAPG)

Nano- to Micron-Sized Pore Types and Pore Size Distribution in Fluvial, Lacustrine, Transitional and Marine Tight to Shale Oil and Gas Plays in China and US


Based on our recent core sample tests using scanning electron microscopy (SEM), focused ion beam-scanning electron microscopy (FIB-SEM), high-pressure mercury intrusion capillary porosimetry (MICP), gas adsorption e.g. CO2 and N2 and nuclear magnetic resonance (NMR) for tight carbonate, sandstone and shales deposited in fluvial, lacustrine, transitional and marine settings in U.S. and China, it is found that nano to micron-sized pores are dominant in the tight sand, tight carbonate to very tight shale reservoirs and FIB-SEM and gas adsorption methods can reveal the abundant nano-scale pores that the MICP could not render. Measurements combining FIBSEM, gas adsorption, MICP and NMR are suggested to reveal the full range of pore and pore throat size distributions. The pores in tight/shale reservoirs can be classified into inorganic matrix related pores including interparticle and intraparticle pores, organic matter related pores (if organic matter is present) and inorganic fracture pores. The dominant pore types and distribution of nano to micron-scale pores and pore throats vary between tight and shale reservoirs. The combining measurements suggest the nano-pores dominate the pore systems of the marine and transitional shales, poorly-sorted and clay-rich tight sand in China and the US. The nano-pores are mainly contributed by inter-crystal pores, inorganic inter-crystal pores and organic pores (for organic-rich shale). The micron pores may dominate in clean tight sand reservoirs and bioclast-rich tight carbonates in U.S. and China. The tested lacustrine shale in Ordos Basin in China is dominated by micron-range pore throats contributed mainly by inorganic minerals.

4 April

Alastair J. Fraser

Alastair J. Fraser, Howard D. Johnson & Gary J. Hampson
Department of Earth Science & Engineering, Imperial College, London.

Location & Time: Room 351, 1:20 p.m.
Session: Oral; Theme 10: International Regions: Europe (AAPG)

The history of oil & gas exploration and development in the Wessex and Weald basins
From oil shale to shale gas


It is interesting to go back in time almost 100 years when the precursors of British Petroleum fresh from their success in drilling large anticlines with carbonate reservoirs in the Zagros mountains of the Middle East finally turned their attention closer to home and to the large surface anticlines in Southern England. It is easy to reflect on the obvious attraction and similarities. Large undrilled Jurassic anticlines and numerous surface seeps such as at Mupe Bay and Osmington Mills on the Dorset coast. Add this to historical evidence of gas production from Heathfield Station in the Weald from a well drilled in 1896 and the mining of the oil shales of the Kimmeridge Clay Formation in Dorset which had been retorted to provide gas for street lighting in the mid 19th century. All the planets were seemingly aligned for a successful exploration campaign or were they?

In this paper we will explore the exploration history of the Weald and Wessex Basins from the largely unsuccessful BP campaign in the 1930s to the hugely successful Wytch Farm discovery in 1973 – the largest onshore oilfield in Northwest Europe with over 1 billion barrels of in-place resources. We will discuss the key success/failure factors for conventional petroleum particularly the part played by modern 2D seismic and petroleum systems analysis. Finally we will touch on the potential for Shale Oil & Gas in the Weald and Wessex basins.