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Diagenesis and reservoir quality of the fourth member sandstones of Shahejie formation in Huimin depression, eastern China

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Abstract

Petrographic analysis combined with various techniques, such as scanning electron microscopy and X-ray diffraction, was used to assess the timing of growth and original mineral cements, the controls on reservoir and reservoir quality of the fourth member sandstones of Shahejie formation (Es4). The Es4 sandstones are mostly arkose and lithic arkose, rarely feldspathic litharenite, with an average mass fraction of quartz 51.6%, feldspar 33.8% and rock fragments 14.6% (Q51.6F33.8R14.6). They have an average framework composition (mass fraction) of quartz 57.10%, K-feldspar 5.76%, sodium-calcium feldspar 13.00%, calcite 5.77%, dolomite 5.63%, siderite 0.95%, pyrite 0.30%, anhydrite 0.04%, and clay mineral 11.46%. The diagenentic minerals typically include kaolinite, illite-smectite (I/S), illite, chlorite, authigenetic quartz and feldspar, and carbonate and pyrite. Es4 sandstone has undergone stages A and B of eodiagenesis, and now, it is experiencing stage A of mesodiagenesis. Reservoir quality is predominantly controlled by the mechanical compaction, for example, 45.65% of the original porosity loss is related to compaction. The original porosity loss related with cementation is only 26.00%. The reservoir quality is improved as a result of dissolution of feldspar, rock fragment and so forth. The porosity evolved from dissolution varies from 3% to 4%.

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Correspondence to Jin-liang Zhang  (张金亮).

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Foundation item: Project(2006AA09Z336) supported by the National High-Tech Research and Development Program of China

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Zhang, Jl., Li, Dy. & Jiang, Zq. Diagenesis and reservoir quality of the fourth member sandstones of Shahejie formation in Huimin depression, eastern China. J. Cent. South Univ. Technol. 17, 169–179 (2010). https://doi.org/10.1007/s11771-010-0027-1

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