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Fracture development and hydrocarbon accumulation in tight sandstone reservoirs of the Paleogene Huagang Formation in the central reversal tectonic belt of the Xihu Sag, East China Sea
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ZHOU Xinhuai,XU Guosheng,CUI Hengyuan,ZHANG Wu
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Table 4 Results of trace element analysis of fine calcite.
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| Sample ID | Mass fraction of carbornate/% | Trace elements content/(10-3 mg·g-1) | Fe/Mn | | CaCO3 | MgCO3 | Na | K | Al | Ba | Si | Mn | Fe | | A-3-29-3-8 | 80.5 | 0.62 | 501.00 | 6495.0 | 8964 | 1130.0 | 19 383 | 7 395 | 6 254 | 0.846 | | A-3-30-2-15 | 68.0 | 1.00 | 78.70 | 9128.0 | 20708 | 284.0 | 32 548 | 5 067 | 7 820 | 1.543 | | A-3-30-3-16 | 94.1 | 0.83 | 22.90 | 71.9 | 224 | 46.0 | 1 147 | 4 393 | 10 661 | 2.427 | | A-3-30-4-20 | 92.4 | 0.89 | 9.61 | 676.0 | 1129 | 54.6 | 3 294 | 3 053 | 11 839 | 3.878 | | A-3-30-4-21 | 93.5 | 0.83 | 6.58 | 341.0 | 608 | 94.1 | 1 690 | 4 129 | 10 035 | 2.431 | | A-3-34-3-29 | 92.0 | 0.83 | 452.00 | 326.0 | 780 | 104.0 | 2 941 | 9 457 | 8 997 | 0.951 | | Average | 86.8 | 0.83 | 178.00 | 2840.0 | 5402 | 285.0 | 10 167 | 5 582 | 9 268 | 2.013 |
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