Characteristics and utilization route discussion of quartz sandstone in Muchuan area of Sichuan Province
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摘要: 四川省沐川地区石英砂岩储量巨大,开采技术条件好。通过采集沐川地区矿区坑道的原矿样品和精选厂的工业品,开展地球化学、薄片鉴定和导流能力实验等测试分析,研究了沐川地区石英砂岩的特征并探讨其开发利用途径。结果显示: 矿石主要为中粒岩屑石英砂岩,矿物成分以石英和硅质岩屑等陆源碎屑为主,含少量黏土杂基和石英胶结物等填隙物; 40/70目工业级石英砂样品在闭合压力28 MPa条件下的破碎率为9.05%,在70 MPa 闭合压力下的导流能力为1.12 µm2·cm,满足四川盆地页岩气井主裂缝的导流能力要求。沐川地区石英砂岩的矿石产品有磷化工、玻璃制品、铸造用型砂以及压裂支撑剂4种应用途径,建议加强石英砂岩压裂支撑剂用途的评价,综合开发利用石英砂岩矿资源,保障服务于支撑剂产业的砂源本地化。Abstract: The quartz sandstone reserves in Muchuan area of Sichuan Province are huge and the mining technology is good. The raw ore samples from the mine tunnel and the industrial products from the mine pilot test base were collected for geochemical, schist ore identification and flow conductivity testing. The characteristics of quartz sandstone in Muchuan area were studied and the exploitation and utilization ways were discussed. The ore is mainly medium-grained lithic quartz sandstone with dense massive structure, and the mineral composition of the ore is dominated by terrigenous debris such as quartz and siliceous rock debris, with a small amount of interstitial materials such as clay and quartz cement. The breakage rate of 40/70 mesh industrial grade quartz sand samples is 9.05% under the condition of 28 Mpa closing pressure, and the conductivity capacity is 1.12 µm2·cm under the closure pressure of 70 Mpa, which meets the requirements of the conductivity of the main fracture of shale gas wells in Sichuan Basin. There are four applications of quartz sandstone ore products in Muchuan area, including phosphorus chemical industry, glass industry, molding sand for casting, and fracturing proppant. It is necessary to strengthen the evaluation of quartz sandstone fracturing proppant, and comprehensively develop and utilize quartz sandstone mineral resources in Muchuan arca to ensure the sand source localization of the proppant industry.
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Key words:
- quartz sandstone /
- fracture proppant /
- Sichuan Province
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