基于地震反射特征的梨树断陷白垩纪沉积研究

首先利用地震资料的外部形态对梨树断陷白垩纪营城组沉积地层划分为块状、丘状、透镜状、充填相、席状及杂乱相等6种类型;进一步结合振幅、频率和连续性等属性特征将其细分为9种地震相;然后利用取心井的沉积构造特征、粒度概率曲线特征、C-M图及测井曲线等资料确定了研究区典型井的沉积相;将营城组上部定为辫状河三角洲相,下部主要为扇三角洲相,局部发育湖底扇相。采取井-震结合的研究方法建立研究区地震相与沉积相之间的对应关系,用地震资料研究该地区沉积相的划分。

Research of Cretaceous Sedimentary Based on Seismic Reflection Characteristics in Lishu Rift

First, seismic data are used to the external form of cretaceous city group of pear trees rift sedimentary strata are divided into blocks, hummocky, lenticular, filling phase, sheet and mixed and disorderly equal to six types, in combination with characteristics of amplitude, frequency and continuity properties will be further subdivided into 9 kinds of seismic facies; Then use of coring well core features, sedimentary structure, grain size probability curve characteristics, C - M figure and well log data to determine the depositional characteristics of the typical Wells in the study area, the city group of the upper as braided river delta facies, lower mainly fan-delta facies, local development as the sublacustrine fan facies, adopt the combination of well-earthquake research method to establish the corresponding relationship between the seismic facies and sedimentary facies in the study area, and research the division of sedimentary facies this region.