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基于层序地层学、地震沉积学理论及三维可视化技术,结合3D高分辨率地震资料,对渤中凹陷西斜坡BZ3-1区块东营组层序进行高精度三维沉积体系分析.研究将东营组古沟谷分为V型、U型、W型及复合型4种类型,并详细刻画不同类型、不同期次的古沟谷从上游-下游的分叉、汇合的充填特征及其从发育-消亡的不同时期演化特征.研究区地震多属性异常区域在平面上多紧靠断层的下降盘,呈规模不一的扇状展布.结合测井曲线、岩心、地震相、地震多属性特征等分析可知,东营组层序沉积相类型分为扇三角洲、辫状河三角洲、滨浅湖,同时对不同相带边界进行了定量厘定.高精度三维沉积体系分析结果表明,由于三级层序发育于二级层序的不同体系域,会导致三级层序的体系域沉积体发育特征产生不同.SQd3层序发育于二级层序的低位体系域,其低位体系域的扇体规模要远远大于高位体系域的扇体;SQd2L层序发育于二级层序的水进体系域,其低位体系域三角洲朵体规模与高位体系域的三角洲朵体相当;SQd2u层序发育于二级层序的高位体系域,其高位体系域三角洲朵体规模远远大于低位体系域的三角洲朵体.
Based on sequence stratigraphy, seismic sedimentology theory and 3D visualization technology, combined with 3D high-resolution seismic data, a high-resolution three-dimensional sedimentary system of the Dongying Formation of BZ3-1 block in the western slope of the Bozhong Depression is analyzed. The ancient valleys are divided into four types: V type, U type, W type and compound type, and the characters of the filling and confluence of the ancient valleys from different types and stages are described in detail. In the study area, the multi-attribute seismic anomalies in the study area are close to the descending disk of the fault in the plane and show fan-shaped distribution with different scales.Combining with the analysis of logging curves, core, seismic facies, and multi-attribute features of earthquakes, The sequences of sedimentary facies in Dongying Formation are divided into fan delta, braided river delta and shore-shallow lake, and the boundaries of different facies bands are determined quantitatively.The results of high-precision three-dimensional sedimentary system show that the three- Different system sequences of the sequence will result in different developmental characteristics of the sedimentary body of the third-order system.SQd3 sequence develops in the lower system tract of the second-order sequence, and the fan body of the lower system tract should be far The SQd2L sequence is developed in the second-order water system tract, and the low-scale system tract delta body size is equivalent to the delta system body in the upper system tract. The SQd2u sequence is developed in the second-order sequence Of the high-level system domain, the high-level system of delta-scale body size is much larger than the low-level system of delta bodies.