ZJK盆地西部地层与地震层序划分以及生储盖组合的初步分析

SUBDIVISION OF THE FORMATION AND SEISMIC SEQUENCE OF THE WESTERN ZJK BASIN AND PRELIMINARY ANALYSIS OF COMBINATION OF SOURCE BED, RESERVOIR AND COVERING STRATA

本文首先根据ZJK盆地西部业已钻探的相当数量钻井的资料,查清了该盆地基底和新生界地层系统及岩性特征。再利用丰富的地震信息,对比、追踪、连层,并分析波组的反射特点及其相互接触关系,对新生界地层进行了较详细的地震层序的划分。综合古生物、岩电和地震资料,确定了全盆地几个最重要的不整合面。同时,应用海平面升降周期曲线,探讨各主要地震层序的时代归属。最后,分析了全盆地的生储盖组合特征,为找油找气奠定了基础。

Based on the information from a number of wells drilled in the western ZJK Ba sin, the basin basement, Cenozoic formation system and lithologic features are, in the first place, established. And what are done next include making correlation, tra eking and finding the bearing upon adjacent horizons by using the very informative seismic data. Also, a study is made with regard to the reflection characteristics of individual wave group and its interactive contact relationship as well. In addition, the subdivision of seismic sequence is carried out. By integrating information of palaeontology, petrology and electric logging, and seismic, several major unconformity interfaces are defined. Meanwhile, the possible age of the major seismic sequences have been discussed one by one ulitizing the cyclic curve showing the rise and fall of sea level. Finally, an analysis is made for the combination features of source bed, reservoir bed and covering strata of the entire basin so as to lay a foundation in search of oil /gas.