【摘要】 准中沙漠区沙丘起伏剧烈,厚度变化大,二维勘探时主要采用小折射法进行近地表调查,近地表结构测量不准确使激发井深设计不合理,造成沙漠区资料品质较差,圈闭可靠程度低。近期开展的新一轮勘探,主要利用深井微测井近地表调查结果,对沙漠区顶、底板结构、厚度、速度、深度–时间关系、吸收衰减等地球物理参数进行了研究。研究发现,准中沙漠区属于固定或半固定沙丘,具有平缓稳定变化的沙丘底界面,深度–时间对应关系一致性好,不同位置相同的深度具有近似的速度与品质因子有良好的对应关系等特点。针对不同厚度沙丘分别采用逐点设计井深单深井激发、多井浅井组合激发,研发了综合沙丘量板拟合静校正、近地表吸收补偿等针对性技术,获得了高品质地震资料。更多还原

【Abstract】 Because of intensely fluctuating dunes and varies thickness in hinterland of Junggar desert area,short refraction survey is mainly used in the 2D near surface exploration;however,this method causes inaccurate near-surface structure measurement,leading to poor desert area seismic data quality and low trap reliability. In the new round of exploration launched recently,we used the result of micro logging survey to study the geophysical parameters,such as desert region top,bottom interface structure,thickness,velocity,depth-time relation,absorption and attenuation,etc. Research shows that sand dunes in the hinterland of Junggar Basin desert area are fixed or semi-fixed,and are characteristic of stability and gentle bottom interface,good consistency of depth-time relation,basically same buried depth velocity in different region and good correspondence between velocity and quality factor. According to different thickness of sand dunes,we adopted single deep-well shooting with roll-along designing excitation well depth and multiple and shallow well array shooting. High-quality seismic data has been obtained by developing comprehensive dune map fitting statics correction and near surface absorption compensation technology.更多还原