摘要
莺歌海盆地东方B气田黄流组为快速重力流海底扇沉积，砂体分布及叠置关系复杂，储层非均质性强。常规属性与波阻抗反演分辨率低，无法有效识别单砂体。地质统计学反演虽然分辨率高，但不适用于非均质强的地区；因此，文中引入基于马尔科夫链蒙特卡洛算法的高分辨率波形相控指示反演。该方法在空间上可体现地震相的约束，预测的砂体平面更加符合沉积规律，垂向上与井点砂泥岩吻合程度较好。基于该波形指示反演结果，借鉴东方区已钻井揭示的砂体边界解释原则，对沉积复杂的H1Ⅱb砂体进行了精细刻画。结果表明：储层砂体精细刻画结果与后期钻井吻合程度高，已解决多口井气水矛盾问题，为随钻轨迹调整提供了依据，对后续开发井井位优化及实施具有指导意义。
Abstract
Huangliu Formation of Dongfang B gas field in Yinggehai Basin is a fast gravity flow submarine fan deposit, with complex sand body distribution and superimposition relationship, and the reservoir heterogeneity is strong. The resolution of conventional attributes and wave impedance inversion is low, so it is unable to effectively identify single sand body. Although geostatistical inversion has high resolution, it is not suitable for areas with strong heterogeneity. Therefore, this paper introduces a high-resolution waveform facies controlled indication inversion method based on Markov chain Monte Carlo algorithm. This method can reflect the constraints of seismic facies in space, and the predicted sand body is more in line with the sedimentary law in the plane, and is in good agreement with the sand and shale of the well vertically. Based on the waveform indication inversion results and the sand body boundary interpretation principle revealed by drilling in Dongfang district, the complex sedimentary H1Ⅱb sand body is finely depicted. The results show that the fine characterization of reservoir sand body is highly consistent with the later drilling, which has solved the contradiction between gas and water in many drilled wells, provided the basis for trajectory adjustment while drilling, and has guiding significance for the optimization and implementation of well location in subsequent development.
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