三维地震在榆树林地区油气藏勘探中的应用

THE APPLICATION OF 3D SEISMIC SURVEY FOR OIL/GAS POOL IN YUSHULIN AREA

大庆油田物探公司

Daqing Oilfield Geophysical Co.

榆树林地区的三维地震勘探是大庆油田的第一次三维地震工作。所获资料采用INTERPRETⅡ解释系统作精细解释,并与二维地震资料进行对比分析,取得了显著的地质效果。解决了松辽盆地争论多年的“T₂地震结构”问题,表明它是断层的反映;发现了一批小幅度构造和小断层,为提高钻探成功率打下了良好的基础,提高了深层反射的信噪比,为解决盆地内深层地震勘探的难题提供了新的途径。三维地震勘探成果的综合分析,使我们对榆树林地区油气聚集的规律有了新的认识。

The 3D seismic survey conducted in the Yushulin area was the one first ever used in Daqing Oilfield. The data collected from there have been elaborately interpreted (examined in considerable detail ) using INTERPRET-22 system. And the analysis against 2D seismic data was made. An appreciable geological payoff yielded therefrom has been made. As a result, " the seismic pattern T2", a highly controversa! problem existed in Songliao Basin for years has been satisfactorily solved. It indicates that there must be a fault . A bunch of minor faults and minor structures are discovered, which lay a sound foundation for ensuring the success rate of drilling. An improvement’ of S/N ratio of deep reflection has been shown. Thus, a new approach being enable to resolve the "tough nut " encountered in deep seismic exploration within the basin is developed. Also, an overall study of the result produced from 3D survey furnishes us the possibility of getting acquainted with the established regularity of hydrocarbon accumulation in Yushulin area.