莱北地区新近系明化镇组下段浅水湖盆砂体预测

The Sandstone Prediction of Neogene Minghuazhen Formation Lower Member in Shallow Water Lake Basin,Northern Laizhou Bay

莱北地区新近系明化镇组下段(以下简称"明下段")浅水湖盆砂体发育规律的认识程度相对较低,由于渤海海域新近系浅层油气藏中,浅水环境下沉积的砂岩储层占较大比重,因此有效预测该区明下段浅水湖盆砂体的发育规律对后期油气勘探显得尤为重要。针对浅水湖盆砂体单层厚度普遍较薄,侧向迁移快,叠置发育的特征,单种方法难以有效预测及研究区钻井资料较少,限制地震反演应用等问题。在充分利用高分辨地震资料基础上,提出一套适合研究区的研究思路。具体思路如下:首先井震联合建立高频层序等时格架,主要含油层段划分11个五级层序。其次在波形分类地震相砂体预测宏观趋势指导下,结合优选的最小振幅属性,对目的层段内浅水湖盆砂体进行精细刻画。砂体预测结果表明,平面上,明下段储集砂体展布具有明显的分带性。纵向上,三级层序控制明下段主要含油层段储集砂体类型及富集段。该预测结果可为渤海海域新近系浅水湖泊沉积体系的深入认识及油气勘探提供科学依据。

It is relatively low that the development regularities of cognition degree in Neogene Ming Huazhen Formation lower member（the following abbreviate MFLM） in shallow water lake basin in northern Laizhou bay shallow lake basin. The shallow water environment represents a significant proportion of sedimentary sandstone reservoir of the Neogene shallow reservoirs in Bohai sea. So the effective prediction of the MFLM sandstone development regularities in shallow water lake basin is particularly important to the oil and gas exploration. According to the shallow water lake sandstone thickness is generally thin,lateral migration characteristics of fast and superposed development. A single method is difficult to effectively predict,and a few drilling datas effect results of seismic inversion in the studyarea.In order to predict distribution of sandstone effectively, high resolution seismic data utilized to propose a set of available methods for studdy area. Concrete ideas are as follows： first of all, establishing high frequency sequence framework with well-seismic calibration; secondly, using waveform classification seismic facies technique to predict the sandstone macroscopic trend, with the constraint of the trends the minimum amplitude attribute optimized, and the distribution of sandstone of target formation described well. The prediction results show that the MFLM sandstone reservoir has obvious zonality in plan, and level 3 sequence control of the types of reservoir in oil layer section and enrichment. These results could be used to in-depth understanding of Neogene shallow lake sedimentary system in Bohai sea, and provide a scientific basis for oil and gas exploration.