东北及华北含油气盆地岩浆活动对碎屑岩的改造与成岩作用贡献

含油气盆地中的岩浆活动不但对碎屑岩围岩进行了物理改造，而且也引起了分布局限的热变质作用。同时，岩浆活动也加速了围岩的成岩作用进程。并且直接或间接地为成岩作用提供了物质来源。岩浆活动对碎屑岩围岩的物理改造表现为围岩热拱张裂和气孔一杏仁构造的形成，前者普遍见于三江盆地、松辽盆地和渤海湾盆地；后者发现于松辽盆地南部。岩浆活动引起的热变质作用普遍见于三江盆地、松辽盆地、渤海湾盆地和海拉尔盆地，并且以泥岩围岩的角岩化、砂岩围岩中基质重结晶成绢云母和绿泥石为特征。岩浆活动也可引起氧化硅凝胶在孔隙中的直接沉淀，例如松辽盆地南部营城组砂岩中的梳状石英。由于岩浆活动引起了地温梯度的升高，因而在浅部地层中可发现深部地层中才可形成的铁方解石等。岩浆活动直接或间接引起的片钠铝石和方解石的沉淀见于海拉尔盆地、三江盆地和渤海湾盆地。

The Effect of Magmatic Activity on Clastic Rocks and Its Contribution to Diagenesis in Northeast and North China Petroleum-Isostasy Model for Bearing Basin

The magmatic activity occurred in the Petroleum--Isostasy Model for bearing basins not only altered the wall rocks physically, but also caused local thermal metamorphism. In addition, the magmatic activity speeded up the diagenesis of the wall rocks, and supplied material directly or indirectly for the diagenesis. The physical alteration of wall rock caused by magmatic activity is characterized by the formation of thermal--cracking and pore--almond structure. The former is found in Sanjiang Basin, Songliao Basin and Bohaiwan Bain; the latter outcropped in southern Songlaio Basin. The thermal metamorphism caused by magmatic activity occurred universally and is characterized by hornfels altered from mudstone wall rock and sericite and chlorite recrystallized from the matrix of sandstone wall rock. The gummy silica can be precipitated directly from thermal liquid caused by the magmatic activity, such as the comb quartz occurred in the sandstone of Yingcheng Formation ,in southern Songlaio Basin. The iron--calcite generally formed in the deep portion of the strata can be found in the shallow portion of the strata due to the magmatic activity which can lead to the increase of temperature gradient. The dawsonite and calcite caused by the magmatic activity have been found in Hailaer Basin ,Sanjiang Basin and Bohaiwan Basin.