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随着南海东部勘探进程的推进,中深层地层(珠江组到基底)成为勘探评价的主要目的层,其勘探程度决定了南海东部储量的规模。但是由于海上各种干扰因素的存在,影响到中深层地质成像的品质,制约了南海东部下一步勘探进程,提高中深层成像品质是当前南海东部亟需解决的问题。常规共中心点叠加理论是基于水平层状介质的假设前提,有一定的局限性。倾角共反射面叠加方法对地层倾角不做限定假设,地下反射面可以是任意的角度,相较于共中心点叠加理论而言更接近实际地质情况;倾角共反射面叠加技术在共反射点及其附近第一菲涅尔带内全部反射波的叠加,因此形成超级覆盖次数,能够显著提高信噪比。经过前期理论研究、资料试验及在南海东部深水区的应用,证实倾角共反射面叠加技术能够有效改善该区中深层地震资料信噪比、适用于复杂地层地质条件,能极大地提高地震资料的可解释性。相信该理论的进一步应用将有助于指导南海东部深水区的勘探、提高勘探成功率及勘探储量规模。
With the progress of the exploration in the eastern South China Sea, the middle and deep strata (Pearl River Formation to basement) have become the major target strata for exploration and evaluation. The exploration degree determines the scale of reserves in the eastern South China Sea. However, due to the presence of various maritime disturbances, the quality of middle-deep geological imaging is affected, which restricts the next exploration process in the eastern South China Sea. Improving middle-deep imaging quality is an urgent problem to be solved in the eastern South China Sea. Conventional center-point stacking theory is based on the assumption of horizontal layered media, which has some limitations. Inclination total reflection surface superposition method is not limited to assume that the formation dip angle, the underground reflection surface can be any angle, compared with the common center point superposition theory is closer to the actual geological conditions; tilt total reflection surface superposition technology in the total reflection point and The superposition of all the reflected waves in the first Fresnel zone near it, thus forming a super-coverage number and significantly improving the signal-to-noise ratio. After preliminary theoretical research, data experiment and application in the deepwater area in the eastern part of the South China Sea, it is confirmed that the dip-total reflection surface stacking technique can effectively improve the signal-to-noise ratio of medium-deep seismic data in this area and is suitable for the geological conditions of complex strata and can greatly enhance the seismic data Explanatory. I believe the further application of the theory will help guide the exploration of the deep waters of the eastern South China Sea to improve the success rate of exploration and exploration reserves.