淮南矿区新集矿1001井煤系泥岩脆性矿物及其沉积控制  

Brittle minerals and depositional control of mudstone in coal measures form in well 1001 in Huainan mining area

作　　者：余坤[1] 屈争辉[1,2] 余可龙 邵春景 李耿 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《煤田地质与勘探》2017年第6期14-21,共8页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41302130);国家级大学生创新训练项目(201510290062);江苏省大学生创新训练计划指导项目(201610290081X)~~

摘　　要：采取钻孔岩心样品,采用X射线衍射、有机碳含量、镜质体反射率等测试方法,研究淮南矿区新集井田1001井煤系泥页岩组成特征、脆性及其沉积控制。结果表明:煤系泥页岩TOC质量分数偏低,为0.6%~6.05%,平均2.44%;干酪根类型以Ⅲ型为主,少量Ⅱb型,处于生油窗和湿气生成范围;泥岩矿物成分以石英和黏土矿物为主,脆性指数主要为20%~60%,平均45%,储层脆性高,可压裂性较好,具有储层改造的潜力。缺氧滞留还原环境有利于脆性矿物发育,对泥页岩脆性控制有促进作用;海相向陆相环境过渡过程中,黏土矿物含量增加,脆性矿物含量明显减少,泥页岩脆性受抑制;受海洋影响较强的还原环境对该井煤系泥页岩中脆性矿物的发育较为有利,这一结果可能在较大程度上受埋藏成岩作用的影响。Based on drilling core samples, X-ray diffraction, organic carbon, vitrinite reflectance and other tests were used to explore the characteristics of the composition, brittleness and depositional control of mudstone in coal measures form well 1001 in Huainan mining area. The results show the TOC content of the mud shale is low, ranging between 0.6%-6.05%, with an average of 2.44%. Kerogen is mainly of type Ⅲ, a few of kerogen is of type IIb, kerogen is in oil generation window and range of moisture generation, has suitable conditions for gas generation. The mineral composition of shale is dominated by quartz and clay minerals, brittleness index ranged from 20% to 60%, with the average of 45%. The shale is hard, showing good fracture resistance, it has the potential transformation. Hypoxic environment is conducive to the development of brittle minerals, playing a positive role to the brittleness of shale. When marine environment changed into terrestrial environment, during the transition, clay mineral content increased, brittle mineral content decreased, which plays a negative role to the brittleness of shale. Reductive depositional environment is conducive to the well, shale brittleness increased, obviously the results may be subject to burial diagenesis largely, which need to be further explored.

关 键 词：淮南矿区 煤系 泥岩 矿物 脆性评价 沉积控制 

分 类 号：TD712.62[矿业工程—矿井通风与安全]