Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1306/01301918093 |
Geochemical constraints on the origins of calcite cements and their impacts on reservoir heterogeneities: A case study on tight oil sandstones of the Upper Triassic Yanchang Formation, southwestern Ordos Basin, China | |
Xi, Kelai1; Cao, Yingchang1,2; Liu, Keyu1,2; Wu, Songtao3; Yuan, Guanghui1; Zhu, Rukai3; Zhao, Yiwei4; Hellevang, Helge5 | |
2019-10-01 | |
发表期刊 | AAPG BULLETIN |
ISSN | 0149-1423 |
EISSN | 1558-9153 |
出版年 | 2019 |
卷号 | 103期号:10页码:2447-2485 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Norway |
英文摘要 | Calcite cementation has been identified as an active process in the Upper Triassic Yanchang Formation throughout its burial history and as a major diagenetic factor causing strong reservoir heterogeneities. The origins of calcite cements and their relevance to reservoir heterogeneities were investigated using a suite of petrographic and geochemical methods, including optical microscopy with fluorescence and cathodoluminescence, scanning and backscattered electron microscopy with energy-dispersive spectrometry, x-ray diffraction, x-ray fluorescence, electron probe microanalysis, quantitative evaluation of minerals by scanning electron microscopy, fluid inclusion analysis, and carbon and oxygen stable isotope analyses. The sandstones are compositionally immature with relatively high amounts of volcanic rock fragments. The two generations of calcite cements are Ca-I and Ca-II. The Ca-I calcites are distributed along the interface of sandstone and mudstone units and were formed during the Late Triassic to Early Jurassic at formation temperatures of approximately 90 degrees C. The Ca-II calcite mainly developed in the lower part of the fining-upward sandstone units and was formed in the Late Jurassic at higher temperatures of approximately 110 degrees C. The origins of calcite cements were constrained by geochemical and isotope measurements, fluid inclusion homogenization temperature, and in situ element analysis. The Ca-I calcite cement originated from dissolution of the lacustrine depositional carbonates in the interbedded mudstones and reprecipitation in the adjacent sandstones. The Ca-II calcite was mainly related to organic matter decarboxylation, with Ca2+ having been provided internally by volcanic fragment alteration and plagioclase dissolution. Calcite cementation had caused strong reservoir heterogeneities in the Yanchang Formation tight sandstones. The Ca-I calcite cementation destroyed reservoir properties along the interface of sandstones and mudstones. The lower parts of the fining-upward sandstone units were tightly cemented by Ca-II calcite, although they originally had high porosity and permeability. The middle-upper parts of the fining-upward sandstone units contain less calcite cements and thus have better preserved reservoir pores because of oil emplacement inhibiting the calcite cementation processes. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489899900008 |
WOS关键词 | BOHAI BAY BASIN ; CARBONATE CEMENTATION ; DIAGENETIC ALTERATIONS ; QUARTZ CEMENTATION ; HYDROCARBON ACCUMULATION ; DEPOSITIONAL FACIES ; QUALITY PREDICTION ; FLUVIAL SANDSTONES ; AUTHIGENIC QUARTZ ; EOCENE SANDSTONES |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187163 |
专题 | 地球科学 |
作者单位 | 1.China Univ Petr, Key Lab Deep Oil & Gas, Qingdao, Shandong, Peoples R China; 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China; 3.Res Inst Petr Explorat & Dev, Beijing, Peoples R China; 4.China Univ Petr, Sch Geosci, Qingdao, Shandong, Peoples R China; 5.Univ Oslo, Dept Geosci, Oslo, Norway |
推荐引用方式 GB/T 7714 | Xi, Kelai,Cao, Yingchang,Liu, Keyu,et al. Geochemical constraints on the origins of calcite cements and their impacts on reservoir heterogeneities: A case study on tight oil sandstones of the Upper Triassic Yanchang Formation, southwestern Ordos Basin, China[J]. AAPG BULLETIN,2019,103(10):2447-2485. |
APA | Xi, Kelai.,Cao, Yingchang.,Liu, Keyu.,Wu, Songtao.,Yuan, Guanghui.,...&Hellevang, Helge.(2019).Geochemical constraints on the origins of calcite cements and their impacts on reservoir heterogeneities: A case study on tight oil sandstones of the Upper Triassic Yanchang Formation, southwestern Ordos Basin, China.AAPG BULLETIN,103(10),2447-2485. |
MLA | Xi, Kelai,et al."Geochemical constraints on the origins of calcite cements and their impacts on reservoir heterogeneities: A case study on tight oil sandstones of the Upper Triassic Yanchang Formation, southwestern Ordos Basin, China".AAPG BULLETIN 103.10(2019):2447-2485. |
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