处理解释一体化技术在低勘探程度地区的应用

Application of integrated processing and interpretation technology in low exploration zones

留守营凸起位于辽东湾坳陷南部,周围紧邻富油气凹陷,邻区发现多个大型油田,研究区具有类似成藏条件,具有良好的勘探前景。然而研究区内原始二维地震资料信噪比低,资料处理存在多次波发育和速度横向变化快等问题,高精度成像难度大,并且该区无测井资料,难以开展精细构造解释和准确构造成图。为此,依托GeoEast系统开展了适合低勘探程度地区的处理解释一体化技术研究及应用:采用处理系统中保真去噪、组合多次波压制和层控网格层析等处理模块,改善地震资料的成像品质;参考邻区构造模式和岩性组合特征,在无井区开展精细构造解释,对比邻区速度模型与地震处理平均速度谱模型差异,采用平均速度谱模型进行变速成图,提高了构造成图精度。研究成果为该区油气勘探提供了资料支撑。

Liushouying uplift is located in the south of Liaodong Bay Depression and is surrounded by oilrich depressions.In addition,several large oil fields have been found in adjacent areas.The study area has similar reservoir-forming conditions and shows positive exploration prospects.However,the original 2D seismic data has a low signal-tonoise ratio,and difficulties such as multiple wave development and fast lateral velocity change are encountered during data processing.As a result,high-precision imaging cannot be realized.Furthermore,as the study area has no well-logging data,fine structure interpretation and accurate structure mapping are hard to be accomplished.Therefore,on the basis of the GeoEast system,research and application of integrated processing and interpretation suitable for low exploration zones are carried out.Specifically,this paper adopts processing modules such as fidelity denoising,combined multiple wave attenuation,and layer-constrained grid tomography to improve the seismic imaging quality,which provides a data basis for the fine structure interpretation.Furthermore,the paper carries out a fine structure interpretation in zones without wells by learning structure modes and lithology combination characteristics from adjacent areas,and comparing the adjacent velocity model and average velocity spectrum model of seismic processing.The structural map got from average velocity spectrum model have effectively improved the mapping precision.The research provides important support for oil and gas exploration in this area.