论文部分内容阅读
针对兴马地区沙三段重力沉积砂体非均质性强、横向变化快、储层预测难度大的问题,运用层序地层分析和波形分类技术,在层序格架内基于储层沉积特征和地震反射特征,建立储层特征与地震波形的对应关系,较好地预测了重力沉积砂体的空间展布。结果表明,研究区沙三段可分为3个层序,构成3个“下粗上细”的沉积旋回;在各旋回中,重力沉积砂体均表现为强振幅、中低频、中好连续反射,平面上可构成10类地震相和3个地震相区,分别对应中扇辫状沟道微相、中扇前缘微相和外扇浊积岩-湖泊相;对比各层序,层序SQ3和层序SQ2的南部地区重力沉积砂体最为发育,为最有利的勘探目标区。
Aiming at the problem of strong heterogeneity of gravity sedimentary sand bodies in the third member of Shahejie formation in Xingma region and rapid horizontal variation, it is very difficult to predict the reservoir. Based on sequence stratigraphic analysis and waveform classification, based on reservoir sedimentary characteristics And the characteristics of seismic reflection, the corresponding relationship between reservoir characteristics and seismic waveforms is established, and the spatial distribution of gravity-deposited sand bodies is predicted well. The results show that the sedimentary cycle of the Shasan Member of the study area can be divided into three sequences, forming three sedimentary cycles of “coarse and fine”. In each cycle, the gravitational sedimentary bodies show strong amplitude, low and medium frequency Good continuous reflection, the surface can be composed of 10 kinds of seismic facies and 3 seismic facies, respectively, corresponding to fan braided trench microfacies, fan front porphyra and fan turbidite - lacustrine facies; contrast of the various sequences , And the southern part of SQ2 and SQ2 are the most developed areas for gravity sedimentary sand, which is the most favorable exploration target area.