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Palaeotemperatures and Diagenetic Phases of the Upper Triassic Oil-bearing Sandstones in the Eastern Part of the Ordos Basin

引用

Acta Geologica Sinica(English Edition) 1997年第3期71卷 305-316页

作者： liu Yiqun feng qiao and li wenhou department of geology, northwest university, xi’an, shaanxi fei zhenbi department of geology Northwest University Xi'an Shaanxi [?]liu Yiqun Born in 1951 graduated from the department of geology Northwest University in 1975 received a master degree in engineering in 1988. Now she is studying for a doctor degree with reservoir geology as her research subJect. She has long undertaken the teaching of petrology and study of reservoirs. She is an associate professor at the department of geology Northwest University.

The maximum palaeotemperature of oil-bearing sandstones in the UpperTriassic in the eastern Ordos basin has been determined by using many methods including thevitrinite reflectance, fluid inclusion, apatite fission track, illite crystallinity, chlorite polytypeand diagenetic change of authigenic minerals. The thermal gradient in the Late Mesozoic wasabout 2.9-3.0℃/100m. The Upper Triassic was in a mature stage of organic matter andhydrocarbon began to be generated and migrated during this period. The palaeotemperatures ofoil-bearing sandstones were in the range of 88-110℃; those for the generation and migrationof oil ranged from 112 to 122℃. The thickness of the denuded strata overlying the UpperTriassic was 2465-2750m. The present burial depth of oil-bearing sandstones is generally from400 to 1200m. At a depth of ca. 1900m, the temperature may reach 140℃. Below this depth,organic matter was supermature and mainly generated gas.

关键词： palaeotemperature diagenetic phase Late Mesozoic oil-bearing sandstones Ordos basin

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