![]() Xiao, 2014, Hydrocarbon generation kinetics of lacustrine Yanchang Shale in southeast Ordos Basin, North China: Energy & Fuels, 28, 5632–5639, doi: 10.1021/ef501011b. Zhang, 2017, Organic petrology of peak oil maturity Triassic Yanchang Formation lacustrine mudrocks, Ordos Basin, China: Interpretation, 5, this issue, doi: 10.1190/int-2016-0111.1. MPEGD8 0264-8172 Crossref Web of Science Google Scholar Valentine, 2015, Standardization of reflectance measurements in dispersed organic matter: results of an exercise to improve interlaboratory agreement: Marine and Petroleum Geology, 59, 22–34, doi: 10.1016/j.marpetgeo.2014.07.015. Jiang, 2014, The composition and its impact on the methane sorption of lacustrine shales from the Upper Triassic Yanchang Formation, Ordos Basin, China: Marine and Petroleum Geology, 57, 509–520, doi: 10.1016/j.marpetgeo.2014.05.010. MAGEA6 0025-3227 Crossref Web of Science Google Scholar ORGEDE 0146-6380 Crossref Web of Science Google Scholar Du, 2016, Geochemical characteristics of oil shale in the Triassic Chang7 subsection, southern Ordos basin, China, and palaeo-environment reconstruction: Journal of Mineralogy and Geochemistry, 193, 45–57. Clure eds., The Oil and Gas Habitats of the South Atlantic: Geological Society (London), Special Publication 53, 181–194. Burwood, R., 1999, Angola: Source rock control for Lower Congo Coastal and Kwanza basin petroleum systems, in: N.IJCGDE 0166-5162 Crossref Web of Science Google Scholar Horsfield, 2012, Formation of nanoporous pyrobitumen residues during maturation of the Barnet Shale (Fort Worth Basin): International Journal of Coal Geology, 103, 3–11, doi: 10.1016/j.coal.2012.04.010. 5.06: ASTM International, West Conshohocken, Penn.,, accessed. Annual book of ASTM standards: Petroleum products, lubricants, and fossil fuels gaseous fuels coal and coke, sec. American Society for Testing and Materials (ASTM), 2015, Standard test method for microscopical determination of the reflectance of vitrinite dispersed in sedimentary rocks.The sizes of OM-hosted pores in these compaction-dominated lacustrine mudstones were one to two orders of magnitude smaller than those in the marine mudstones that display abundant early cementation. Mudstones with well-sorted grains and a higher percentage of coarser grains have more abundant mineral pores. The size distribution of mineral-hosted pores within these mudstones is found to be closely related to the rock texture (sorting and grain size) and fabric. The pore network within Chang 7 mudstones is dominated by OM-hosted pores, with a lesser abundance of interparticle and intraparticle pores. Results from nitrogen-gas adsorption experiments show that there are four distinct patterns of pore-size distribution within the Chang 7 member of the Yanchang Formation with no particular correlation with mineralogical composition and thermal maturity. Owing to the uneven distribution of the sample set from proximal to distal area, we mainly evaluate variations in the proximal setting. This difference in porosity partly caused by differences in the clay mineral content implies that in the fluvial-deltaic-lacustrine depositional environment, reservoir quality can vary significantly in a short distance. ![]() Measured average total porosity of samples from a proximal to distal transect ( ϕ = 5.0 %) is higher than those from the two adjacent cored wells ( ϕ = 2.3 %). ![]() Helium porosimetry, nitrogen adsorption, and field-emission scanning electron microscopy of Ar-ion milled samples were applied. Lacustrine mudstones from nine cored wells along a depositional dip in the southeastern Ordos Basin, China, were investigated. Our main objectives are to (1) learn if pore-evolution models developed from marine mudrocks can be directly applied to lacustrine mudrocks, (2) investigate what controls the different pore types and sizes of Chang 7 organic matter (OM)-rich argillaceous mudstones of the Upper Triassic Yanchang Formation, and (3) describe the texture, fabric, mineralogy, and thermal maturity variation in the Chang 7 mudstones. ![]()
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