岩石矿物成分与可钻性关系研究

钻井地层岩石的物理力学性质和矿物成分性质是实现科学快速钻井的基础数据，但是矿物成分对可钻性的影响一直没有得到重视。取一研究油区以录井资料的地层岩屑为研究对象，对塑性泥岩、细砂岩和砾岩三种岩屑进行了较全面的矿物成分鉴定分析。研究结果表明，研究油田区块岩石的矿物成分主要以石英、粘土、斜长石、方解石和正长石五种矿物成分为主。矿物成分中含量较高的粘土和斜长石含量随井深增加而降低；石英含量随井深增加而增大。泥岩的可钻性级值随粘土的增加有增加趋势，随石英含量的增加而增大。砂岩的可钻性级值随粘土含量的增加有降低趋势,而随石英含量的增加而增大。砾岩的可钻性级值随粘土和石英含量的增加而下降。

Research of the Relationship between Rock Mineral Composition and Drillability

The physics mechanics properties and mineral composition properties of the drilling strata rock are foundational data that carries out the fast and scientific drilling, but the influence of mineral composition to drillability hasn't been get the value. This paper put forward according to strata rock scraps datas of well logging as research object, carried on rather overall mineral composition identify and analysis to the plastic mudstone, fine sandstone and conglomerate. The results indicated that, the mineral composition t of rock in the oil-field area is mainly quartz, clay, plagioclase, calcite and orthoclase.The mineral composition contents of clay and plagioclase decline; But the quartz content increases with the increasing of well depth. The drillability value of mudstone has the trend of decline with the increment of clay content, but increase with quartz content. The drillability value of sandstone has the trend of decline with the increment of clay content, but increase with quartz content. The drillability value of conglomerate has the trend of decline with the increment of clay and quartz contents.