Research on Diagenetic Facies of Low Permeability Reservoir: A Case Study of the Yanchang Formation in Longdong Area, Ordos Basin

Abstract:

Based on data of cast thin section, cathode luminescence and scanning electron microscope, the present paper comprehensively investigated the types and quantitative intensity of reservoir diagenesis of the Upper Triassic Yanchang Formation in Longdong area of Ordos Basin, distinguished the types of diagenetic facies from the aspect of quantitative index. The intensity calculation and classification of compaction, cementation and dissolution indicates that the Yanchang Formation of Longdong area experienced strong compaction including medium to strong compaction and extremely strong compaction locally for the high contents of matrix. There is great difference in cementation intensity which presents mainly in weak cementation with local medium to strong cementation. Dissolution is strong in study area mainly in medium to strong. The reservoir could be divided into eight types of diagenetic facies, including medium compaction with strong dissolution face, medium compaction with medium dissolution face, medium compaction with medium cementation and medium dissolution face, strong compaction with strong dissolution face, strong compaction with medium dissolution face, medium compaction with strong cementation face, strong compaction with strong cementation face and extremely strong compaction face. The reservoir quality of different diagenetic facies has a significant difference.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 145-150
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.145
• Online since: December 2012
• Authors: Jing Fu, Sheng He Wu
• Keywords: Diagenetic Facies, Longdong Area, Low-Permeability Reservoir, Quantitative Characterization, Yanchang Formation

References

[1] Yanhua Chen, Ying Liu: Petroleum Geology and Experiment, Vol. 16(3)(1994), pp.274-281 (in Chinese).

[2] Caineng Zou, Shizhen Tao, Xuanjun Yuan, et al: Acta Petrolei Sinica, Vol. 30(3)(2009), pp.324-331 (in Chinese).

[3] Jennings R H, Mazzullo J M. Shallow Burial Diagenesis of Chalks and Related Sediments at [DSDP leg 80] site 550 on the Goban Spur. Initial Reports of the Deep Sea Drilling Project [M]. US Government　printing Office, Washington D C, Vol. 80(2)(1985), pp.853-861.

DOI: 10.2973/dsdp.proc.80.136.1985

[4] Grigsby J D, Langsford R P. Effects of diagenesis on enhanced-resolution bulk density logs in Tertiary Gulf Coast sandstones: an example from the Lower Vicksburg Formation, McAllen Ranch field, south Texas[J]. AAPG Bulletin,Vol. 80(11)(1996), pp.1801-1819.

DOI: 10.1306/64eda172-1724-11d7-8645000102c1865d

[5] Junjie Yan. Tectonic evolution and hydrocarbon distribution of the Ordos Basin[M].Beijing: Petroleum Industry Press,2002(in Chinese).

[6] Zixin He. Ordos Basin evolution and hydrocarbon [M].Beijing: Petroleum Industry Press,2003(in Chinese).

[7] Fengjie Li, Duoyun Wang, Ximin Zheng,et al. Journal of Xi'an Shiyou University(Natural Science Edition), Vol. 19(3)(2004), pp.1-4(in Chinese).

[8] Sneider R M, Tinker C,Mocked L. Deltaic environment reservoir types and their characteristics. JPT, Vol. 30(11)(1978), pp.1539-1546.

DOI: 10.2118/6701-pa

[9] Shenghe Wu. Reservoir characterization and modeling[M].Beijing: Petroleum Industry Press, 2010(in Chinese).

[10] Yuting Hou, Qingya Guo, Gaoren Li. China petroleum Exploration,Vol. 8(2)(2003), pp.51-54(in Chinese).