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

ZHOU Xinhuai,XU Guosheng,CUI Hengyuan,ZHANG Wu

Table 3 Results of trace element analysis of coarse calcite.

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-3-29-1-1 94.3 0.85 13.90 0.17 46.8 532 7 444 8 764 1.177 A-3-29-1-2 93.8 0.91 1.02 0.90 124.0 354 7 969 9 753 1.224 A-3-29-1-3 94.6 0.75 1.45 0.39 32.8 447 7 702 8 338 1.083 A-3-29-2-4 94.2 0.84 6.05 3.49 0.43 46.1 366 7 653 9 277 1.212 A-3-29-2-5 94.6 0.76 1.73 4.27 1.01 31.4 387 7 375 8 464 1.148 A-3-29-2-6 94.9 0.75 0.39 0.14 42.4 337 6 449 8 009 1.242 A-3-29-3-7 93.9 0.84 7.06 0.65 0.40 45.0 644 8 011 9 857 1.230 A-3-29-3-9 94.3 0.75 2.65 2.02 0.60 53.5 568 7 346 8 777 1.195 A-3-30-1-10 95.2 0.74 9.21 0.33 46.6 487 4 453 9 465 2.126 A-3-30-1-11 94.5 0.77 10.30 3.98 0.71 54.0 404 5 940 9 410 1.584 A-3-30-1-12 94.0 0.85 9.28 8.89 0.39 743 4 287 10 658 2.486 A-3-30-2-13 94.8 0.82 21.70 13.10 2.53 40.4 772 3 756 10 547 2.808 A-3-30-2-14 94.4 1.04 38.00 35.40 3.97 61.7 613 3 862 11 130 2.882 A-3-30-4-19 94.9 0.76 13.50 9.90 18.30 60.9 548 2 763 10 129 3.666 A-3-34-1-22 94.3 0.73 20.40 31.90 3.17 65.5 8 102 8 378 1.034 A-3-34-1-23 94.4 0.71 2.22 0.91 50.4 568 7 471 7 730 1.035 A-3-34-1-24 94.2 0.72 4.01 0.50 0.49 61.4 577 7 850 7 763 0.989 A-3-34-2-25 94.8 0.73 3.67 4.45 1.05 27.9 403 7 663 8 366 1.092 A-3-34-2-26 94.8 0.69 1.25 1.85 29.0 623 7 011 7 795 1.112 A-3-34-2-27 93.9 0.86 4.20 5.04 0.78 34.2 407 9 044 9 301 1.028 A-3-34-3-28 93.9 0.82 10.70 2.73 0.27 51.6 728 9 902 8 981 0.907 A-3-34-3-30 94.2 0.70 16.60 13.10 28.00 59.9 536 7 729 8 007 1.036 Average 94.4 7.94 15.40 9.10 5.50 52.1 538 6 581 9 167 1.600