| 王成,马彦云,何庆志,马风华,汪栋刚,马学东,陆茂欣.宁夏固原六盘山北段马东山组烃源岩地球化学特征及其分布[J].矿产勘查,2026,2(2):257-267 |
| 宁夏固原六盘山北段马东山组烃源岩地球化学特征及其分布 |
| Geonchemical characteristics of source rocks of the Madongshan Formation in the northern part of Liupanshan, Guyuan, Ningxia and its distribution |
| 投稿时间：2024-10-24 |
| DOI：10.20008/j.kckc.202602004 |
| 中文关键词: 六盘山北段 泥页岩 地球化学特征 泥页岩分布特征 |
| 英文关键词: North secion of Liupanshan hydrocarbon source rocks geochemical characteristics distrbution characteristics of hydrocarbon source rocks |
| 基金项目:本文受中国地质调查局项目“祁连成矿带肃南—大柴旦地区地质矿产调查”(DD20160012)、中国矿产地质志项目(DD20221695、DD20190379、DD20160346)联合资助。 |
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| 中文摘要: |
| 本文依托宁夏六盘山北段 1∶5万彭堡等 4幅区域地质调查项目，采用地质剖面测量和地球化学采样测试的方法，对六盘山北段泥页岩的地球化学和分布特征进行了研究。研究表明，六盘山北段地区泥页岩主要赋存于六盘山群马东山组一段下部层位，泥页岩厚度为 30～100 cm，岩性为深灰色、灰黑色泥页岩，整体出露稳定，含大量动植物化石碎片和鱼化石。岩石矿物组分以自生矿物方解石、白云石和碎屑矿物石英长石类富集为特征。泥页岩总有机碳含量为 0.55%～8.95%，生烃潜量(S1+S2)为 0.45～16.12，平均 |
| 英文摘要: |
| This study is based on four 1∶50000 regional geological survey (including Pengpu) in the northernsegment of the Liupanshan, Ningxia. Through geological profile measurements and geochemical sampling and analy-sis, the geochemical characteristics and spatial distribution of mudstone and shale in the northern Liupanshan aresystematically investigated. The results indicate that the mudstone and shale in the northern segment of the Liupan-shan are mainly hosted in the lower part of the first member of the Madongshan Formation of the Liupanshan Group.The mudstone-shale units are 30-100 cm thick, consisting predominantly of dark gray to grayish-black lithologies.They exhibit good lateral continuity in outcrop and contain abundant plant and animal fossil debris, including fishremains. The mineral assemblage is characterized by enrichment in authigenic minerals (calcite and dolomite) anddetrital quartz-feldspar components. The total organic carbon content of the mudstone and shale ranges from 0.55%to 8.95%. The hydrocarbon generation potential (S1+S2) varies from 0.45 to 16.12 mg/g, with an average of 6.34 mg/g.The kerogen type index ranges from .33 to 81.5, with an average of 28, indicating predominantly Type II-III kero-gen. The organic matter is enriched in hydrogen and depleted in oxygen. The pyrolysis peak temperature varies from426 to 473 ℃ , indicating a low level of thermal maturity and a predominance of oil generation. The oil contentranges from 0.2% to 4.5%. Mudstone and shale are exposed only within the Pengpu and Hongzhuang map sheets,and are absent in the Guyuan and Gucheng map sheets. Within the Pengpu map sheet, the strata occur in an NNE-trending, belt-like distribution around the Madongshan anticline, extending from Choushuigou through Shangtaozi-gou, Daxuenao, Miaogou, Tuolianggou, Sireangou, Tieshuiquan to Tianshuigou. The strike is NNE, with dip anglesranging from 36° to 47°. Within the Hongzhuang map sheet, the strata occur in a N-S-trending, belt-like distribu-tion along the Shuigou-Shuigouping-Haijiazhuang-Jianhezi-Kaichenggou area, with dip angles of approximately22° to 50°. The implementation and results of this project provide robust scientific data for the exploration and de-velopment of unconventional oil and gas resources in Ningxia, and identify two prospective target areas. |
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