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碳酸盐岩缝洞型储层是我国西部探区重要的储层,包含较多的孔、洞、缝,其波场信息复杂,常规偏移成像对其成像效果不佳,这已成为制约勘探发展的重要因素.为此本文推导并实现了基于反演思想的高精度最小二乘逆时偏移成像方法,并将其推广应用到碳酸盐岩缝洞型储层.通过对三个基于西部探区实际地质情况建立的典型模型的成像试算,可以发现:与常规逆时偏移结果进行对比,最小二乘逆时偏移能够准确的刻画出裂缝溶洞的位置、形状、大小,验证了该方法在碳酸盐岩缝洞型复杂地质模型的保幅性和成像精度方面的优势.
Carbonate fracture-cave reservoirs are important reservoirs in the western exploration area of China, and contain many holes, holes and seams, and their wavefield information is complex. Normal offset imaging has poor imaging performance, which has become a constraint Therefore, this paper deduces and realizes a high-precision least square inverse time migration imaging method based on inversion idea and extends it to carbonate fractured-cavity reservoirs.Through the analysis of three Based on the imaging trial of a typical model established in the actual geology of the western exploration area, it can be found that the least square inverse time migration can accurately depict the location, shape, size, The advantages of this method in terms of the amplitude-preserving and imaging accuracy of the carbonate fracture-cave complex geological model are verified.