The SPWLA Permian Basin Chapter
Luncheon and Learn
Tuesday, September 29th
11:50 AM - 1:00 PM
"The Role of Organic Matter in Characterizing Unconventional Tight Rocks Using Laboratory NMR"
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Recent studies have established that organic matter in unconventional shale reservoirs plays a key role in determination of petrophysical and geochemical properties, and organic matter content is an important factor in rock frackability. The evaluation of organic matter content is an important stage of shale rock studies. A number of sophisticated investigation tools, such as Rock Eval pyrolysis, are used to obtain information about content, origin and maturity of organic matter in the rock. New methods and techniques are continuously being explored. In this talk, high frequency (20MHz) NMR T1-T2 2-D Mapping and its data processing techniques are used to characterize shale formations with a focus on organic matter and hydrocarbons. The results show that (1) newly acquired fresh shale samples undergo significant changes through evaporation and redistribution of liquids in the first weeks of freshness, and the rate of changing varies with time; (2) the mobility of hydrocarbons in different pores or of different viscosities can be determined by activation energy (Ea) which can be measured through NMR T1-T2 mapping at various sample temperatures; (3) combination of NMR T1-T2 mapping and the advanced programmed (multi-heating ramps, MHR) pyrolysis can verify whether light hydrocarbons reside in pores of different sizes or hydrocarbons of different viscosities in one type of pores. Furthermore, the combined techniques also reveal that chemical solvents used in crushing extraction testing methods such as GRI may dissolve heavy or solid hydrocarbons to create more porosity and to yield a higher oil saturation especially in organic rich source rocks. The new approaches will lead to a potential core analysis protocol for determination of NMR cutoffs of moveable or producible hydrocarbons.
Zonghai Harry Xie is NMR Senior Advisor at Core Laboratories. He received his PhD in Physics from the University of Kent at Canterbury, UK, in 1994. Dr. Xie has spent several years working as Product Specialist to develop and support laboratory NMR products (MARAN product line) at Resonance Instruments Ltd, UK. He has also spent time at Bruker as Senior Applications Scientist in the Time Domain NMR division USA, Technical Director of the Time Domain products for Asia Pacific, and General Manager of Bruker Optics China. Dr. Xie has been focusing on developing new NMR techniques and petrophysics models for unconventional tight rocks since he joined Core Lab in November 2012. He is the current president of NMR SIG of SPWLA..
The Permian Basin Chapter of SPWLA
Next Meeting: October 27, 2020
Monthly Meetings: 4th Tuesday of Most Months
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PermianBasin at spwla.org