| 北羌塘坳陷南部胜利河油浸白云岩 |
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| 关键词:oil-soaked dolomite favorable reservoir potential for petroleum exploration Shenglihe area Northern Qiangtang Depression |
| 基金项目:中国地质调查局项目“羌塘盆地阿木错凹陷油气地质调查”(编号: DD20221855);“羌塘北部龙尾错地区油气地质调查”(编号: DD20211343);陕西省煤田地质集团科研项目“羌塘重点区块油气地质选区评价”(编号: SMDZ-2021ZD-1);中国地质科学院基本科研业务费项目“羌塘盆地古油藏调查及成藏机理研究”(编号: JKY202209) |
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| Oil-soaked Dolomite in Upper Reach of the Shenglihe River,Northern Qiangtang |
| Oil-soaked dolomite discovered recently in the upper reach of the Shenglihe River, south of the Northern Qiangtang Depression, belongs to the upper section of the Middle Jurassic Buqu Formation. The dolomite is dark gray, gently dipping, and overlies dark mudstone and shale of higher total organic carbon content. Microscopic observation of the dolomite revealed dolomitization of bioclastic limestone. The oil-soaked dolomite is covered by ashy asphalt near the surface, and the light crude oil in fractures of the dolomite is volatile. The oil content of the dolomite sampled in the Shenglihe area reaches 765×10–6, which is much higher than the oil content of the dolomite oil sand outcropping in the Long’eni–Andarco Belt ((12–236)×10–6) in the Southern Qiangtang Depression. The oil-soaked dolomite is a favorable reservoir with a porosity of 6.49% and permeability of 3.81 mD. Petroleum geochemistry and biomarker parameters indicate that the crude oil of the dolomite in the Shenglihe area was derived from the Early–Middle Jurassic dark shale and mudstone enriched in organic matter. The oil-soaked dolomite in the Shenglihe area indicates a potential for petroleum resources in the Northern Qiangtang Depression. |
| WU Zhen-han,JI Chang-jun,ZHAO Zhen,KANG Shao-wei,ZHAO Rong-tao,LEI Yun-long.2023.Oil-soaked Dolomite in Upper Reach of the Shenglihe River,Northern Qiangtang[J].Acta Geoscientica Sinica,44(3):411-418. |
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