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  1.  31
    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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  2.  38
    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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  3.  13
    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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  4.  16
    Hydrocarbon Storage Space Within Lacustrine Gas Shale of the Triassic Yanchang Formation, Ordos Basin, China.Xiangzeng Wang, Lixia Zhang, Chengfu Jiang & Bojiang Fan - 2015 - Interpretation: SEG 3 (2):SJ15-SJ23.
    The Triassic Yanchang Formation lacustrine shale is a source of conventional oil accumulation in the Ordos Basin, China. The Yanchang Formation, a hybrid system of organic-rich shale, interbedded silty shale, and siltstone, is believed to be a potential unconventional oil and gas play. Our crossdisciplinary investigation of the storage space included the outcrop description, core observation, thin sections, and scanning electron microscope pore imaging. We evaluated the results from these techniques to reveal that the storage space within the Yanchang Formation (...)
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  5.  45
    Study on the Distribution of Extractable Organic Matter in Pores of Lacustrine Shale: An Example of Zhangjiatan Shale From the Upper Triassic Yanchang Formation, Ordos Basin, China.Yuxi Yu, Xiaorong Luo, Ming Cheng, Yuhong Lei, Xiangzeng Wang, Lixia Zhang, Chengfu Jiang & Likuan Zhang - 2017 - Interpretation: SEG 5 (2):SF109-SF126.
    Shale oil and gas have been discovered in the lacustrine Zhangjiatan Shale in the southern Ordos Basin, China. To study the distribution of extractable organic matter in the Zhangjiatan Shale, geochemical characterization of core samples of different lithologies, scanning electron microscope observations, low-pressure [Formula: see text] and [Formula: see text] adsorption, and helium pycnometry were conducted. The content and saturation of the EOM in the pores were quantitatively characterized. The results show that the distribution of the EOM in the shale (...)
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  6.  18
    Preconditioning Point-Source/Point-Receiver High-Density 3D Seismic Data for Lacustrine Shale Characterization in a Loess Mountain Area.Wei Wang, Xiangzeng Wang, Hongliu Zeng & Quansheng Liang - 2017 - Interpretation: SEG 5 (2):SF177-SF188.
    In the study area, southeast of Ordos Basin in China, thick lacustrine shale/mudstone strata have been developed in the Triassic Yanchang Formation. Aiming to study these source/reservoir rocks, a 3D full-azimuth, high-density seismic survey was acquired. However, the surface in this region is covered by a thick loess layer, leading to seismic challenges such as complicated interferences and serious absorption of high frequencies. Despite a specially targeted seismic processing workflow, the prestack Kirchhoff time-migrated seismic data were still contaminated by severe (...)
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  7.  31
    Identification and Distribution of Fractures in the Zhangjiatan Shale of the Mesozoic Yanchang Formation in Ordos Basin.Hui Shi, Xiaorong Luo, Hui Xu, Xiangzeng Wang, Lixia Zhang, Qingchen Wang, Yuhong Lei, Chengfu Jiang, Ming Cheng & Shan Ma - 2017 - Interpretation: SEG 5 (2):SF167-SF176.
    The natural fractures in mud or shale directly affect the quality and efficiency of shale gas reservoirs, and fracture identification and prediction play an important role in drilling shale gas wells and making plans for reservoir stimulation. We adopted ant tracking technology for 3D poststack reflective seismic waves to identify the size and distribution of high-angle structural fractures in the Zhangjiatan shale of the Yanchang Formation in the Ordos Basin, which is a typical continental shale. The parameters for ant tracking (...)
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  8.  4
    Practical Application of Liquid-CO2/Slick-Water Hybrid Fracturing Technology in the Lacustrine Shale Gas Reservoir in Ordos Basin, China.Xiangzeng Wang - 2015 - Interpretation: SEG 3 (2):SJ75-SJ80.
    The seventh member of the Yanchang Formation, Upper Triassic black shale deposited in the deep and semideep lacustrine environment, is located in the southeast area of the Ordos Basin. It is 1200–1800 m in buried depth and 30–60 m in thickness. As the main target of lacustrine shale gas in this region, the seventh member of the Yanchang Formation usually uses fracturing technology as the major stimulation treatment. Slick-water fracturing with a high-pumping rate has been successful early on, but the (...)
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  9.  24
    Introduction to Special Section: Lacustrine Shale Characterization and Shale Resource Potential in Ordos Basin, China.Tongwei Zhang, Xiangzeng Wang, Hongliu Zeng, Neil Fishman, Barry J. Katz, Kitty L. Milliken, Mingzhen Wei, Bob Loucks & Amin Ghanizadeh - 2017 - Interpretation: SEG 5 (2):SFi-SFii.
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