扶杨油层孔隙水成因与砂岩成岩相研究

The Origin of Pore-Water and the Study of Sandstone Diagenetic Facies of Fu-Yang Formations (K_1q￣(3+4),Northern-Eastern Songliao Basin,NE China (Cretaceous) )

相似的岩石组分决定了相似的成岩特征。但是，控制成岩自生矿物种类、顺序、相对含量和孔队演化还有；（１）孔隙水地球化学性质；（２）埋深和地温梯度；和（３）沉积环境等，这些因素在区域上的差别成了区域上的成岩作用差异，其中具有不同孔隙水成因的局部水动力单元决定了区域上的成岩相类型和成岩相区的划分。研究区的成岩相类型有：（１）大气水淋滤成岩相；（２）混合水成岩相；（３）埋藏压实水成岩相；和（４）古蒸发浓缩水成岩相。

The sandstones in Fu-yang Formations deposited by fluvial-lacustrine sedimentary system have more than 70 percent of unstable fragments such as feldspar and volcanic-rock fragments.Based on thin-section analysis,XRD, SEM, electronprobe and fluid inclusion analysis, the progressive diagenetic sequence for the sandstones could be summarized. But, the diagenetic property is also controlled by ①pore-water geochemistry,② burial depth and geothermal gradient, and ③sedimentary environments and so on, which caused the diagenetic environments fairyly different.The local hydrodynamic units, with different origins and compositions of pore-water, is the main factor, which controls the kinds of diagenetic factes. The planar delimitation lines of local hydrodynamic units are unanomalous with those of local porewater geochemistry units and diagenetic factes.In the study area, four types of diagenetic factes can be recognized: meteoric water infiltration diagenetic factes, burial water diagenetic factes, mixture water diagenetic factes and paleo-evaporation water diagenetic factes.