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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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  • 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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  • Facies, Rock Attributes, Stratigraphy, and Depositional Environments: Yanchang Formation, Central Ordos Basin, China.Stephen C. Ruppel, Harry Rowe, Kitty Milliken, Chao Gao & Yongping Wan - 2017 - Interpretation: SEG 5 (2):SF15-SF29.
    The Late Triassic Yanchang Formation is a major target of drilling for hydrocarbons in the Ordos Basin. Although most of the early focus on this thick succession of lacustrine rocks has been the dominant deltaic sandstones and siltstones, which act as local reservoirs of oil and gas, more recent consideration has been given to the organic-rich mudstone source rocks. We used modern chemostratigraphic analysis to define vertical facies successions in two closely spaced cores through the Chang 7 Member, the primary (...)
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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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