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“东河砂岩”从发现至今,对于其时代归属、层序顶界面位置的识别争议颇多,进而也导致了对该套砂体顶部油气藏特征及油气藏分布预测认识不清。为了分析塔里木盆地塔中地区东河砂岩段层序顶、底界面特征及其对油气成藏的控制作用,综合运用野外露头资料、岩心资料、测井以及地震资料开展了东河砂岩段层序界面的识别,剖析了东河砂岩段顶、底部不整合界面类型、分布、界面上下岩性配置关系及其对油气成藏的作用。研究表明:东河砂岩段顶、底不整合面按成因机制,可划分为5种类型;依据不同类型不整合界面上下岩性的组合,研究区目的层段共识别了23种岩性与不整合面的配置类型。并通过不整合界面对油气运聚作用进行研究,分析了已发现油气田的成藏特征。
From the date of its discovery to the present, there are many controversies about the location of the top boundary of the sequence, which leads to the unclear understanding of the characteristics of the top of the sand body and the prediction of reservoir distribution. In order to analyze the sequence top and bottom boundary of Donghe sandstones in Tazhong area, Tarim basin, and their control over hydrocarbon accumulation, the sequence of Donghe sandstone sequence was comprehensively studied using outcrop data, core data, logging data and seismic data Interface identification, analysis of the East River sandstone top and bottom unconformity interface type, distribution, the upper and lower interface lithology configuration and its role on hydrocarbon accumulation. The study shows that the top and bottom unconformities of Donghe sandstone can be divided into five types according to the genesis mechanism. According to the combination of up and down lithology of different types of unconformity interfaces, 23 kinds of lithology are identified in the study area, Integration surface configuration type. The unconformity interface is used to study the hydrocarbon migration and accumulation, and the hydrocarbon accumulation characteristics of the discovered oil and gas fields are analyzed.