东营凹陷盐家地区陡坡带砂砾岩特征及分布

Study on characteristics and distribution of glutenite in steep slope zone of Yanjia area in Dongying Depression

于景强 张云银 孙志峰 刘海宁 董大伟

中国石化胜利油田分公司物探研究院，山东 东营 257022 山东石油化工学院石油工程学院，山东 东营 257022 中国石油大学（华东）地球科学与技术学院，山东 青岛 266400）

Geophysical Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257022, China School of Petroleum Engineering, Shandong Institute of Petroleum and Chemical Engineering, Dongying 257022, China School of Geosciences, China University of Petroleum, Qingdao 266400, China

利用岩心、地震、测井等数据，文中研究了东营凹陷盐家地区陡坡带近岸水下扇型砂砾岩的沉积结构特征。结果表明：陡坡带靠近断层处，以粗粒、快速沉积的泥石流为主，主体为杂基支撑砾岩，向上变为砾岩；远离断层处，以洪水型重力流沉积为主，底部多为颗粒支撑砾岩，向上变为递变层理砂岩、砂泥混合岩。在沉积模式的约束下，采用地震形态正演分析结合分频地震数据处理可以细化近岸水下扇型砂砾岩五级构型单元的分布，同时对四级构型单元规模进行描述和预测。靠近物源区的四级构型单元规模较小，最大宽度580 m，最大长度1 500 m；随着四级构型单元向湖盆主体沉积区推进，其规模逐渐增加；五级构型单元沉积末期，四级构型单元规模减小。在垂直物源方向上，油水井间受效距离可能不超过2个井距。研究成果丰富了对储层形态结构特征及内部连通体规模的认识，为该类储层的高效开发提供了重要的地质模型。

The sedimentary characteristic model of glutenite of nearshore subaqueous fan in the steep slope zone of Yanjia area in Dongying Depression is studied by using core, seismic and logging data. The result shows that steep slope zone near the fault is dominated by coarse-grained and rapidly deposited debris flows, which is mainly coarse gravel facies supported by the matrix and changes upward into conglomerate facies. Far from the fault, it is dominated by flood gravity flow deposition, and the bottom is mostly grain supported conglomerate facies, which changes upward into graded bedding sandstone facies and sand mud mixed rock facies. Under the constraint of sedimentary model, the forward analysis of seismic morphology combined with frequency division seismic data processing can refine the distribution of the fifth level units of nearshore subaqueous fan. At the same time, the scale of the fourth level unit is described and predicted. The fourth level unit near the source area is small, with a maximum width of 580 m and a length of 1,500 m. As the fourth level units advance to the main sedimentary area of the lake basin, their scale gradually increases. At the end of the deposition of the fifth level unit, the scale of the fourth level unit decreased. In the vertical source direction, the effective distance between oil-water wells may not exceed two well distances. This study enriches the understanding of the morphological and structural characteristics of this type of reservoir and the scale of internal connectivity, and provides an important geological model for the high efficiency of this type of reservoir.

10.6056/dkyqt202304015