地震沉积学在涠西南凹陷A油田新近系角尾组二段Ⅰ油组沉积微相刻画中的应用  

APPLICATION OF SEISMIC SEDIMENTOLOGY TO MICROFACIES IDENTIFICATION FOR J2I OIL FORMATION,THE 2ND MEMBER OF THE NEOGENE JIAOWEI FORMATION IN OIL FIELD A,WEIXINAN DEPRESSION

作　　者：付英娟 林承焰[1] 孟祥君[2] 张宪国[1] 文子桃 陈仕臻 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580 [2]中国地质调查局青岛海洋地质研究所,青岛266071

出　　处：《海洋地质前沿》2016年第6期9-15,共7页Marine Geology Frontiers

基　　金：国家科技重大专项(2011ZX05009-003);国家自然科学基金(41202092)

摘　　要：A油田位于北部湾盆地的涠西南凹陷,新近系角尾组二段I油组(J2I)为主要的储层,油组内部不同微相砂体厚度、岩性存在差异,并且A油田为海上油田,钻井少,井网分布不规则,这些因素制约了J2I油组井间沉积微相刻画。本文从井点出发,通过岩心资料确定了井点沉积微相特征。充分利用地震资料,运用地震沉积学的研究方法,对研究区井间沉积微相进行精细刻画。运用分频解释技术和等时地层切片生成层位技术,井震结合,确定了最小等时研究单元,即J2I油组的I-1小层和Ⅰ-2小层。将小层界面作为地震属性提取的时窗,并对提取的地震属性进行属性—砂厚的相关性分析,将相关性最大的属性作为沉积相划分的主要依据。通过J2I油组2个小层的沉积微相的刻画,分析了J2I油组"临滨砂坝—浅滩"的纵向沉积演化。The oilfield A is located in the Weixinan Depression of the Beibu Gulf. The 2nd member of the NeogeneJiaowei Formation is the main reservoir. It consists of various sedimentary microfacies which vary in thickness and depositional characteristics. Such differences restrict the description of sedimentary microfacies for inter-well reservoir. In this paper, we recognize the types of sedimentary facies according to the analysis data from drilling wells. The oilfield A is an offshore oilfield in its ear- ly stage of development. There are few drilling wells scattered in the region. The only choice is to fully use the high resolution 3D seismic data to carry out the study of seismic sedimentology. The minimum isochronous research units, such as the J2I-1 and J2I-2, are determined using the frequency division interpretation technique and stratigraphic slice technique. They are regarded as the seismic at- tributes time window. Correlation of the seismic attributes and thickness of the sand bodies is carried out. And the seismic attributes, which have maximal correlation coefficients with the thickness of sand bodies, and the seismic section features are used to define the plane distribution pattern of the sedimentary facies. Upon the spatial distribution pattern of sedimentary microfacies of J2I-2 and J2I- 1, the evolution of sedimentary facies from nearshore sand bars to shallow water is established.

关 键 词：地震沉积学 沉积微相 分频解释 地层切片 地震属性 临滨沉积 

分 类 号：P618.130.2[天文地球—矿床学]