松辽盆地北部西部断陷沙河子组沉积特征

大量地震、录井、测井资料沉积学分析结果表明，松辽盆地北部西部断陷带沙河子组发育的沉积体系有扇三角洲，湖泊，湖底扇体系和火山岩，在平面上，靠近沉区边界发育裙带状三角洲沉积体系，其中夹有大量火山岩，沉积区中央部位为大片的湖泊体系沉积，以深湖－半深湖沉积为主，在深湖一半深湖沉积区发育有湖底扇，这一沉积特征展示了松辽盆地北部西部断陷带沙河子组生，储，盖层均十分育，具有良好的油气勘探前景。

Research on depositional characteristics of Shahezi formation in Western fault depression of North Songliao Basin

Based on a large number of data of core, log and seism, and by the newest methods of sedimentology, this paper clarified the characteristics of sedimentology of Shahezi Formation in Western Fault Basins Belt of North Songliao Basin. There are fan delta depositional systems, lacustrine and lake-floor fan systems and also volcanic facies developed in the fault basins. Fan delta depositional system were developed along the margin fault; toward the basin, lacustrine system was developed, and deep lake facies were developed very well; and in the deep lake area near the fan delta, lake floor fan was developed. These kinds of characteristics of sedimentology reveal the favorable conditions of source rock, reservoir and seal rock and the favorable potential of oil and gas exploration.