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Tight oil‐bearing sandstones in the Chang 4+5, 6 and 7 Members of the Upper Triassic Yanchang Formation in the Ordos Basin, north‐central China, in general consist of fine‐grained, moderately‐ to poorly‐sorted lithic arkoses (average Q53F30R17) deposited in a fluvial‐dominated lacustrine‐deltaic environment. Diagenetic modifications to the sandstones include compaction and cementation by calcite,...
Non‐marine tight‐gas sandstones have not been studied intensively in terms of diagenesis and reservoir‐quality evaluation. This paper investigates the sandstones in the Lower Cretaceous Denglouku Formation in the Songliao Basin, NE China, which comprise a tight reservoir for natural gas. Core samples of the sandstones were obtained from eight wells located in two gasfields and were described in terms...
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