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| DOI | 10.1306/03061918062 |
| Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China | |
| Li Y.; Li Y.; Gao X.; Meng S.; Wu P.; Niu X.; Qiao P.; Elsworth D. | |
| 发表日期 | 2019 |
| ISSN | 0149-1423 |
| 起始页码 | 2757 |
| 结束页码 | 2783 |
| 卷号 | 103期号:11 |
| 英文摘要 | An integrated analysis of the petrographic characteristics and types and distribution of diagenetic alteration in the upper Paleozoic Benxi-Taiyuan, Shanxi, and Xiashihezi Formations provides insights into the controlling factors on variations in porosity and permeability in tight sandstones (85% of the sandstone samples display porosity values <10% and 90% of the samples exhibit permeability <1 md). Diagenetic alteration includes mesogenetic compaction, cementation by dolomite, ankerite, and quartz, dissolution of feldspar, and illitization of smectite. Eodiagenesis includes compaction, development of smectite, cementation by pore-filling quartz and disordered kaolinite, and precipitation of calcite and Fe-calcite. Chlorite and quartz preserve primary pores against damage, whereas kaolinite, illite-smectite (I/S) mixed layer, and illite significantly diminish reservoir quality via permeability reduction. Chlorite and I/S content decrease abruptly as depth increases, whereas the kaolinite content remains elevated at depth because of the complete destruction of K-feldspar. The transformation from smectite to illite provides silica ions for the widely distributed quartz overgrowths. As the depositional environment transformed from fluvial (Xiashihezi) to deltaic (Shanxi) and to epicontinental (Taiyuan and Benxi), the dissolution effect increased monotonically. Feldspar dissolution is dominant in the Shanxi Formation,whereas the Benxi and Taiyuan Formations commonly contain quartz dissolution pores. The Taiyuan Formation has markedly higher porosities than in the overlying and underlying formations, caused by strong dissolution and high silica content. The decrease in porosity in the Benxi Formation results from the extensive formation of clay minerals caused by high frequency transgressions in a transitional environment. © 2019 The American Association of Petroleum Geologists. All rights reserved. |
| 关键词 | CalciteCementing (shafts)CompactionDissolutionFeldsparKaoliniteMetamorphic rocksPetroleum reservoir engineeringPorosityQuartzStructural geologyDepositional environmentDiagenetic alterationFeldspar dissolutionIntegrated analysisOrdos basin , ChinaPermeability reductionPetrographic characteristicsTransitional environmentsSandstoneclay mineraldepositiondepositional environmentdiagenesisdissolutionillitizationPaleozoicpermeabilitypetrographyporositysandstonesedimentary sequenceBenxiChinaLiaoningOrdos BasinShanxiTaiyuan |
| 语种 | 英语 |
| 来源机构 | AAPG Bulletin |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/131704 |
| 推荐引用方式 GB/T 7714 | Li Y.,Li Y.,Gao X.,et al. Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China[J]. AAPG Bulletin,2019,103(11). |
| APA | Li Y..,Li Y..,Gao X..,Meng S..,Wu P..,...&Elsworth D..(2019).Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China.,103(11). |
| MLA | Li Y.,et al."Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China".103.11(2019). |
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