CAJ | 학술논문

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。
준중사막구사구기복극렬，후도변화대，이유감탐시주요채용소절사법진행근지표조사，근지표결구측량불준학사격발정심설계불합리，조성사막구자료품질교차，권폐가고정도저。근기개전적신일륜감탐，주요이용심정미측정근지표조사결과，대사막구정、저판결구、후도、속도、심도–시간관계、흡수쇠감등지구물리삼수진행료연구。연구발현，준중사막구속우고정혹반고정사구，구유평완은정변화적사구저계면，심도–시간대응관계일치성호，불동위치상동적심도구유근사적속도여품질인자유량호적대응관계등특점。침대불동후도사구분별채용축점설계정심단심정격발、다정천정조합격발，연발료종합사구량판의합정교정、근지표흡수보상등침대성기술，획득료고품질지진자료。
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 mea-surement,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 inter-face,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.