粘土矿物研究在塔里木盆地石油勘探中的应用

APPLICATION OF CLAY MINERAL STUDY TO OIL AND GAS EXPLORATION IN THE TARIM BASIN

以塔里木盆地粘土矿物的分布特征及其组合形式、演化与形成机理为依据，探讨了粘土矿物在地层划分对比中的应用及其与有机质热演化、成岩阶段的关系和对储层物性的影响。研究表明，在侏罗系和白垩系两个不同古环境中形成的粘土矿物及其组合特征，为地层对比提供了一定的证据。泥岩中伊利石／蒙皂石间层中蒙皂石含量的纵向变化与有机质热演化及成岩阶段的关系不大。对储层物性影响不大但有利于储集性能的是以高岭石为主的粘土矿物组合类型及粘土矿物的早期自生（伊利石／蒙皂石间层矿物）衬垫式以及非自生（伊利石）衬垫式产状。

n the basis of studying the distribution,association, evolution and forming mechanism of clay minerals in the Tarim Basin, the authors discuss the application of the associate characteristics of clay minerals to strata correlation, the relationship among evolution of organic matter, diagenetic stage and clay minerals, and the influence of clay minerals on the reservoir behaviour. Clay minerals and their associate characteristics in the two ancient environments during Jurassic and Cretaceous periods are useful for strata correlation. The smectite content of illite/smectite mixed minerals in mudstone has no obvious vertical variation and relationship with the evolution of organic matter and the diagenetic stage. The kaolinite mineral and the early authigenic illite are favourable to the reservoir behavour.