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  1. Liquid Hydrocarbon Characterization of the Lacustrine Yanchang Formation, Ordos Basin, China: Organic-Matter Source Variation and Thermal Maturity.Xun Sun, Quansheng Liang, Chengfu Jiang, Daniel Enriquez, Tongwei Zhang & Paul Hackley - 2017 - Interpretation: SEG 5 (2):SF225-SF242.
    Source-rock samples from the Upper Triassic Yanchang Formation in the Ordos Basin of China were geochemically characterized to determine variations in depositional environments, organic-matter source, and thermal maturity. Total organic carbon content varies from 4 wt% to 10 wt% in the Chang 7, Chang 8, and Chang 9 members — the three OM-rich shale intervals. The Chang 7 has the highest TOC and hydrogen index values, and it is considered the best source rock in the formation. Geochemical evidence indicates that (...)
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  • Grain Composition and Diagenesis of Organic-Rich Lacustrine Tarls, Triassic Yanchang Formation, Ordos Basin, China.Kitty L. Milliken, Ying Shen, Lucy T. Ko & Quansheng Liang - 2017 - Interpretation: SEG 5 (2):SF189-SF210.
    The role of the primary detrital grain assemblage as a control on diagenetic pathways is reasonably well-understood in sandstones and limestones, but less so in mudrocks. We have documented diagenesis in mudstones from the Triassic Yanchang Formation that are dominated by grains derived from outside the basin of deposition. Major extrabasinal grains are K-rich clay, quartz, plagioclase, K-feldspar, lithic fragments, and micas. In terms of the quartz-feldspar-lithic grain compositions, the silt fraction in these samples is classified as arkose. Grains of (...)
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  • Controls on Pore Types and Pore-Size Distribution in the Upper Triassic Yanchang Formation, Ordos Basin, China: Implications for Pore-Evolution Models of Lacustrine Mudrocks.Lucy T. Ko, Robert G. Loucks, Kitty L. Milliken, Quansheng Liang, Tongwei Zhang, Xun Sun, Paul C. Hackley, Stephen C. Ruppel & Sheng Peng - 2017 - Interpretation: SEG 5 (2):SF127-SF148.
    Our main objectives are to learn if pore-evolution models developed from marine mudrocks can be directly applied to lacustrine mudrocks, investigate what controls the different pore types and sizes of Chang 7 organic matter -rich argillaceous mudstones of the Upper Triassic Yanchang Formation, and describe the texture, fabric, mineralogy, and thermal maturity variation in the Chang 7 mudstones. Lacustrine mudstones from nine cored wells along a depositional dip in the southeastern Ordos Basin, China, were investigated. Helium porosimetry, nitrogen adsorption, and (...)
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  • Chemostratigraphic Insights Into Fluvio-Lacustrine Deposition, Yanchang Formation, Upper Triassic, Ordos Basin, China.Harry Rowe, Xiangzeng Wang, Bojiang Fan, Tongwei Zhang, Stephen C. Ruppel, Kitty L. Milliken, Robert Loucks, Ying Shen, Jianfeng Zhang, Quansheng Liang & Evan Sivil - 2017 - Interpretation: SEG 5 (2):SF149-SF165.
    A chemostratigraphic study of a 300 m long core recovered from the southeastern central Ordos depocenter reveals thick intervals of fine-grained, organic-rich lacustrine strata, interpreted to represent deepwater deposition under meromictic conditions during lake highstand phases, interspersed with thick intervals of arkosic sandstones, reflective of fluvio-deltaic deposition during lake lowstand phases. Along with elevated concentrations of %Al, traditionally a proxy for clay content, maximum total-organic-carbon values in the deepwater lacustrine facies reach 8%, with average values of approximately 3%. The fine-grained, (...)
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  • Pore Types, Pore-Network Analysis, and Pore Quantification of the Lacustrine Shale-Hydrocarbon System in the Late Triassic Yanchang Formation in the Southeastern Ordos Basin, China.Robert G. Loucks, Stephen C. Ruppel, Xiangzeng Wang, Lucy Ko, Sheng Peng, Tongwei Zhang, Harry D. Rowe & Patrick Smith - 2017 - Interpretation: SEG 5 (2):SF63-SF79.
    Continental Upper Triassic Yanchang “black shales” in the southeastern Ordos Basin have been proven to be unconventional gas reservoirs. Organic-matter-lean and organic-matter-rich argillaceous mudstones form reservoirs that were deposited in a deeper water lacustrine setting during lake highstands. In the stratified lake, the bottom waters were dysaerobic to anoxic. This low-energy and low-oxygen lake-bottom setting allowed types II and III organic matter to accumulate. Interbedded with the argillaceous mudstones are argillaceous arkosic siltstones deposited by gravity-flow processes. Rock samples from the (...)
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  • Geochemical Evidence for Oil and Gas Expulsion in Triassic Lacustrine Organic-Rich Mudstone, Ordos Basin, China.Tongwei Zhang, Xiangzeng Wang, Jianfeng Zhang, Xun Sun, Kitty L. Milliken, Stephen C. Ruppel & Daniel Enriquez - 2017 - Interpretation: SEG 5 (2):SF41-SF61.
    Forty-six core samples were collected from a deep well that penetrated organic-rich layers of the Chang 7, 8, and 9 members of the Yanchang Formation in the Ordos Basin. Tests for total organic content, Rock-Eval pyrolysis, X-ray diffraction mineralogy, and molecular composition of gases released from rock crushing were conducted. Analytical results indicate that TOC and clay contents are elevated. The organic matter -rich mudstone in the Triassic Yanchang Fm suggests good-to-excellent source potential for oil generation. Its thermal maturity is (...)
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  • Seismic Expression of Delta to Deep-Lake Transition and its Control on Lithology, Total Organic Content, Brittleness, and Shale-Gas Sweet Spots in Triassic Yanchang Formation, Southern Ordos Basin, China.Hongliu Zeng, Wei Wang & Quansheng Liang - 2017 - Interpretation: SEG 5 (2):SF1-SF14.
    The Triassic Yanchang Formation is currently a hot spot for lacustrine shale-gas exploration in the Ordos Basin, China. A seismic-sedimentological study using a newly acquired 3D survey was conducted to advance the interpretation and prediction of the shale-gas reservoirs. The seismic volume was converted into a log-lithology volume at the thin-bed level. The inverted acoustic impedance volume was stratal sliced to extract seismic geomorphologic information. Deltaic facies and depositional history were interpreted using lithologic and planform morphology of seismic attributes on (...)
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