Research Article
Minerals Filling in Anhydrite Dissolution Pores and Their Origins in the Ordovician Majiagou Formation of the Southeastern Ordos Basin, China
Table 3
Carbon and oxygen isotope results of calcite filling in mold and corresponding dolomite matrix in Yican 1 well in the southeastern Ordos Basin.
| | Samples | Depth (m) | Lithology | Formation | δ13C of calcite in mold (VPDB ‰) | δ18O of calcite in mold (VPDB ‰) | δ13C of dolomite matrix (VPDB ‰) | δ18O of dolomite matrix (VPDB ‰) |
| | 92 | 2641.38 | Dolomicrite | Ma51 | 0.26 | -11.12 | -0.59 | -8.04 | | 152 | 2688.00 | Dolomicrite | Ma54 | -5.59 | -14.32 | -1.01 | -9.89 | | 164 | 2729.92 | Dolomicrite | Ma56 | -7.56 | -11.27 | -6.87 | -10.95 | | 172 | 2731.80 | Dolomicrite | Ma56 | -6.25 | -12.52 | -2.21 | -8.36 | | 186 | 2808.49 | The fine crystalline dolomites | Ma4 | -2.70 | -15.58 | -1.93 | -10.32 | | 220 | 2821.06 | The fine crystalline dolomites | Ma4 | -2.77 | -13.49 | -0.92 | -6.75 | | 228 | 2823.70 | The fine crystalline dolomites | Ma4 | -7.20 | -11.76 | -0.14 | -7.80 | | 229 | 2823.80 | The fine crystalline dolomites | Ma4 | -6.41 | -10.09 | 0.18 | -7.00 | | 232 | 2945.62 | The fine crystalline dolomites | Ma3 | -3.71 | -8.96 | -3.11 | -7.10 | | Average | -4.66 | -12.12 | -1.84 | -8.47 |
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