| 李佐强,贺勇,张芹贵,江永富,张君.川西北广元莲花地区天然沥青矿地质特征及矿床成因[J].矿产勘查,2025,16(9):2099-2110 |
| 川西北广元莲花地区天然沥青矿地质特征及矿床成因 |
| Geological characteristics and genesis of natural bitumen in Lianhua area, Guangyuan, northwest Sichuan |
| 投稿时间：2023-07-10 |
| DOI：10.20008/j.kckc.202509003 |
| 中文关键词: 天然沥青矿 地质特征 矿床成因 找矿标志 白田坝组 |
| 英文关键词: natural bitumen geological characteristics ore genesis clue for prespecting Baitianba Formation |
| 基金项目:本文受四川省自然资源科研项目(KJ-2022-5)和四川省第七地质大队科研项目(207队科2023-1号、207队科2023-3号)联合资助。 |
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| 中文摘要: |
| 川西北地区天然沥青矿成矿地质条件优越，地表分布众多的沥青脉和油苗，但区内研究工作程度较低，导致天然沥青矿找矿难以取得突破。本文系统分析了莲花矿区含沥青矿岩系的沉积相特征、矿石显微结构特征，结合地质勘查成果，对矿床成因进行了分析。结果表明:天然沥青矿体赋存于下侏罗统白田坝组，共圈定出 6条工业矿体，其中似层状矿体(2条)产于白田坝组底部，矿体主要赋存于扇三角洲前缘亚相—水下分流间湾微相的低能砂泥岩内；脉状矿体(4条)主要赋存于白田坝组上部拉张裂隙中。建立了矿区天然沥青矿三阶段成矿过程:印支期下寒武统及震旦系的烃源岩中原始油气经多期次的运聚初始聚集成藏→燕山期油气运移至白田坝组底部砂泥岩内聚集为半固态沥青→燕山—喜山期形成裂隙充注(脉状)、原始赋存(似层状)型沥青经变质作用最终固化成天然沥青。 |
| 英文摘要: |
| The geological conditions of the natural bitumen is superior, and a large number of bituminous veinsand oil seepageon the surface in northwest Sichuan. However, due to the low degree of the research work in the area,which makes it difficult to make a breakthrough in natural bitumen prospecting. In this paper, the characteristics of sedimentary facies of the bituminous rock series and microstructure of ore, and the genesis of mineral deposit is ana-lyzed based on geological exploration. The results show that the natural bitumen occurred in the Lower Jurassic Bait-ianba Formation, and a total of 6 industrial ore bodies have been identified. the layered ore bodies (2) are located atthe bottom of the Baitianba Formation. and mainly occurs in the low-energy mudstone of the subsea interdistribu-tary bay microfacies of the front of the fan delta subfacies.The vein ore bodies (4) occurs in the tension fissure of theupper part of Baitianba Formation.The three-stage ore-forming process of natural bitumen was established:In theIndosinian period, the original oil and gas in the Lower Cambrian and Sinian source rocks were migrated and accu-mulated after multiple periods; In the Yanshan period, oil and gas migrated to the mudstone at the bottom of the Bai-tianba Formation and accumulated into semi-solid bitumen; During the Yanshan-Himalayan period, fracture fillingtype (vein) and original occurrence (layer-like) bitumen were formed, which were finally solidified into natural bitu-men after metamorphism. |
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