松辽盆地北部深层火山岩地震成像技术

SEISMIC IMAGING TECHNOLOGY FOR DEEP VOLCANIC ROCK IN THE NORTH OF SONGLIAO BASIN

松辽盆地北部营城组发育大范围巨厚火山岩,并且埋藏在4 000 m以下。由于火山岩储层埋藏深,地层速度横向变化大,造成地震剖面信噪比低,成像不清晰。这里分析了深层火山岩地震资料特点和原因,并在此基础上提出了深层火山岩处理的核心技术,是叠前去噪、信号增强和叠前成像。通过采用叠前组合去噪,高密度自动速度分析技术,优势偏移距叠加技术,共反射面元叠加技术和叠前时间偏移等处理方法,在松辽北部深层火山岩地震资料目标处理中效果明显,资料品质较老地震剖面有了显著提高,说明了该技术的可行性和实用性。

Yingcheng formation which buried mostly deeper than 4 000 m is abundant in volcanic rock in the north of Songliao Basin.Because the volcanic rock reservoir is deep and formation velocity varies greatly,the seismic section is low S/N and the imaging of the object is generally bad.The article analyses the characteristic of seismic and the reason for it,and summarizes the key problem and technology of deep volcanic rock seismic data processing which include pre-stack de-noising,signal enhancing and pre-stack migration.Then high-dense automatic velocity analysis,priority offset stack,CRS and PSTM are used in the north of Songliao basin.From a comparison with former seismic section,the quality of seismic data of deep volcanic rock is increased highly.The result demonstrated that the approaches applied is practical and valid.