松辽盆地南部中央坳陷区扶余油层古地貌恢复及构造演化

针对松辽盆地南部中央坳陷区扶余油层开展古地貌恢复及构造演化的研究存在3 个难点: 较多区域存在强烈剥蚀，地层破坏严重; 岩性变化大，造成压实恢复困难; 数据计算庞大、繁琐。本文通过优选有效的地层剥蚀方法，建立合理的连续脱压实恢复方程，编制便捷的软件，完成了该项研究。研究揭示扶余油层沉积时期，研究区地势相对平坦，使得河道砂体广泛分布，南、西南、西部3 个低势区控制了4 个水系的发育; 青山口期末研究区初具坳陷形态，之后形态变化较小，至嫩江期末研究区中部青一段烃源岩埋深超过1 400 m，达到生烃门限深度，进入生排烃期。至明水期末最大埋深达 2 400 m，绝大部分地区达到生烃门限深度，之后抬升剥蚀，构造形态定型。

Paleogeomorphological restoration and tectonic evolution of Fuyu reservoir in central depression of southern Songliao Basin

There are three difficulties in study of paleogeomorphological restoration and tectonic evolution in the Fuyu reservoir of the central depression in south Songliao Basin，including the strong erossion and severe strata destrution in most areas; the lithology changing quickly，making the compacting restoration difficult; and the data calculation tremendous and complicated． The study has been finally accomplished by selecting the effective strata erosion method，establishing resonable continual compaction restoration equation and working out easier software． It shows that during the sedimentary period of Fuyu reservoir，the channel sand body were distributed widely，and the three low-potential energy areas in south，southwest and west areas controlled the development of the four water systems， which all were due to the comparatively even topography in the research area． The depression conformation of the research area formed at the end of Qingshankou stage with little change happening later，and the buried depth of K1qn1 source rocks in the central research area is over 1 400 m at the end of Nenjiang stage，which reaches the threshold depth of hydrocarbon generation and goes into the stage of hydrocarbon generation and expulsion． At the end of Mingshui stage，the maxium burial depth was up to 2 400 m，reaching the threshold depth in most of the area． Lifting and erosion happened later，and the tectoinc conformation finally shaped．