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A geopulse seismic system was implemented to obtain new information on underlying strata beneath the Yellow River Delta. However, owing to the shpping of sea floor and shallow water ( 〈 25 m), free surface-related multiples are conflicted with the flat primaries, which may instruct the interpreters in a wrong way and make wrong conclusions. Owing to the variation of multiple periods, standard anti-multiple techniques may lose their power, such as predictive deconvolution. Surface-related multiple elimination methods are introduced to attenuate the multiples based on the underlying waveequation principles. The results justified the method on the single-channel geopulse profile, revealing the real nature of the subsurface. 相似文献
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为解决琼东南盆地深水区新区天然气勘探中遇到的天然气运移认识不清的难题,在实验(数值)模拟和大量调研基础上,综合钻井、构造和地震等资料,利用盆地模拟软件,开展了深水区天然气运移规律系统研究。结果显示,深水区天然气运移主要受到“流体势场” —“通道场(输导体系格架)”—“约束场(区域盖层)”3场耦合的控制。高势生烃凹陷内的底辟带和晚期活化沟通气源断裂发育区的陵水组区域盖层完整性被破坏,天然气垂向运移为主,利于在区域盖层之上形成多个中小规模气藏组成的浅层大中型岩性型气田;部分凹陷边缘—低凸起及之上地区陵水组区域盖层保存完整,断裂—砂体—构造脊汇聚型复合输导体系发育,天然气运移侧向为主,利于在区域盖层之下形成深层整装构造型大中型气田,而新构造运动是深水区晚期大中型气田形成的重要诱因。深水区最终形成了浅层和深层两套成藏体系和3套有利成藏组合。成果指导勘探,在松南低凸起深层成藏组合勘探中首次获得突破性发现,继续拓展,有望在中央峡谷外找到新的大中型气田群。 相似文献
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