Citations of:
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
Interpretation: SEG 5 (2):SF63-SF79 (2017)
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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 (...) No categories |
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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 (...) No categories |
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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, (...) No categories |
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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 (...) No categories |
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Understanding the structure of the pore throat is an important task for tight reservoir development. The common methods of studying the pore-throat structure include pressure-controlled mercury injection, rate-controlled mercury injection, X-ray computer tomography, and scanning electron microscopy. We have used those four methods to understand the pore-throat structures of three main lithologies in the Lucaogou Formation, Jimsar Sag, China. The PMI results revealed that the pore-throat size of all of the lithologies ranges from 0.013 to [Formula: see text]. The RMI (...) No categories |
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Understanding the structure of the pore throat is an important task for tight reservoir development. The common methods of studying the pore-throat structure include pressure-controlled mercury injection, rate-controlled mercury injection, X-ray computer tomography, and scanning electron microscopy. We have used those four methods to understand the pore-throat structures of three main lithologies in the Lucaogou Formation, Jimsar Sag, China. The PMI results revealed that the pore-throat size of all of the lithologies ranges from 0.013 to [Formula: see text]. The RMI (...) No categories |