黑龙江北部孙吴-嘉荫盆地构造特征、演化及石油地质条件

重力解释孙吴-嘉荫盆地基底埋深一般在0.1～2.5 km，基底形态具有北东走向的“三断两隆”的构造特征，自西向东称孙吴断陷、茅栏河隆起、沾河断陷、富饶隆起和嘉荫断陷.地震解释基底深度一般在0.1～6.3 km，并据之进一步划分了断陷的次级构造单元.孙吴-嘉荫盆地的形成和演化与南部的松辽盆地颇为相似，大致经历了前裂陷、断陷、坳陷和萎缩4个阶段.下白垩统淘淇河组、上白垩统永安村组和太平林场组埋藏较深，厚度较大，烃源岩达到成熟阶段，储层发育，物性较好，为油气勘探的主要目的层.对沾河断陷和嘉荫断陷油气勘探有利区做了进一步预测，确定乌拉嘎凹陷是嘉荫断陷最有利的勘探区，确定沾河向斜是沾河断陷最有利的勘探区.

Structural features, evolution and petroleum geological conditions of the Sunwu-Jiayin Basin in northern Heilongjiang province

The data of gravity and seromagnetic surveys revealed that the depth of buried basement of the Suwu-Jiayin Basin was 0.1一2.5 km,and the basin could be divided into three depressions sandwiched in two uplifts with NE trend, which were named, in eastward order, the Sunwu Fault-Depression, the Maolanhe Rise, the Zhanhe Fault-Depression, the Furao Rise and the Jiayin Fault-Depression.The seismic data showed the basemental depth of the basin being 0.1-6.3 km, and sub-order tectonic units of the fault-depressions were divided further.The formation and evolution of the Suwu-Jiayin Basin seemed similar to the Songliao Basin, which went through four stages, namely, the pre-extensional stage, the faulting depression stage, the down-warping stage and withering stage.The source rocks in the Lower Crataceous Taoqihe Formation,the Upper Crataceous Yongancun and Taipinglinchang formations were matured and the reservoir was good,which were main exploration layers in the basin.According to the evaluation of the petroleum geological conditions, the paper forecasted that the Wulaga Sag in the Jiayin Fault-Depression and the Zhanhe syncline in the Zhanhe Fault-Depression should be potential exploration areas.