泌阳凹陷王集地区开发地震采集方案设计研究

Design and research of seismic acquisition scheme for development in Wangji area of Biyang sag

泌阳凹陷王集地区发育复杂断块、断层岩性油藏,且已进入勘探开发中后期,现有地震资料核三上段低序级断层的断面不清,不能满足油气勘探开发需求。在开发地震采集方案设计时,充分考虑王集地区构造特征及前期地震采集因素,采用基于融合处理的设计理念,应用地震数值模拟技术优选观测系统参数,基于叠前成像需求的波动方程对观测系统面元属性进行对比分析,确定了小面元、高覆盖、宽方位开发地震采集方案。依据该开发地震设计方案施工,采集到的地震资料波场信息丰富,地震剖面信噪比与分辨率明显改善,提高了小断层、小断块、微幅度构造及断层-岩性油藏识别能力,发现和落实了多个含油圈闭。

Wangji area of Biyang sag, with developed complex fault block and fault lithologic reservoir, has entered the later period of exploration and development. The low-grade sequence fault section of existing seismic data on the upper 3 rd member of Hetaoyuan formation is not clear;it can’t meet the demand of oil and gas exploration and development. In the development of seismic acquisition scheme design, the tectonic characteristics of Wangji area and the previous seismic acquisition factors should be fully considered. Through application of wave equation based on the need of pre-stack imaging, the bin attributes of the observation system are compared and analyzed. And then the seismic acquisition design of small bin, high coverage and wide azimuth has been determined. According to the construction of the seismic design scheme, the wave field information of seismic data collected are abundant, and the signal-to-noise ratio and seismic profile resolution are obviously improved, which improves the identification ability of small faults, small fault-blocks, microamplitude structures and fault-lithology reservoirs, and confirms multiple oil-bearing traps.