乍得Doseo盆地白垩系层序地层与沉积体系

发布时间：2018-06-13 03:00

本文选题：乍得 + Doseo盆地　；参考：《中南大学学报(自然科学版)》2016年06期

【摘要】：利用层序地层学理论,综合分析地震和钻井资料,对乍得Doseo盆地白垩系地层层序界面特征、沉积类型、沉积体系分布及生储盖组合进行系统分析。研究结果表明:研究区识别出6个层序界面,划分为2个二级层序,5个三级层序;三级层序内依准层序组叠置样式,可细分为低位体系域、湖侵体系域和高位体系域。沉积类型主要有5种类型,即滨浅湖、三角洲、辫状三角洲、冲积河流及半深湖—深湖。沉积演化形成4种沉积体系,即分布广泛的湖泊沉积体系、盆地南缘三角洲沉积体系、盆地北缘辫状三角洲沉积体系及早期SQ1层序和晚期SQ5层序中发育的冲积河流沉积体系,前三者主要分布在SQ2,SQ3和SQ4层序中,构造活动及古地貌控制沉积体系的分布。生储盖组合可分为顶生式、正常式和自生自储式,SQ2,SQ3和SQ4层序能形成有利生储盖组合,预测有利生油区和储集区,湖侵期的暗色泥岩是最有利生油区,低位期和高位期的砂体是有利储集区。
[Abstract]:Based on sequence stratigraphy theory and comprehensive analysis of seismic and drilling data, the characteristics of sequence interface, sedimentary types, distribution of sedimentary system and assemblage of source, reservoir and cap in the Cretaceous system in Doseo Basin, Chad, are systematically analyzed. The results show that there are 6 sequence interfaces identified in the study area, which can be divided into two secondary sequences and five third-order sequences, and the tertiary sequences can be subdivided into lowstand system tracts, lacustrine transgressive system tracts and high system tracts according to the quasi-sequence superposition pattern. There are five types of sedimentary types, namely shallow littoral lake, delta, braided delta, alluvial river and semi-deep lacustry-deep lake. The sedimentary evolution formed four sedimentary systems, namely, the widely distributed lacustrine sedimentary system, the delta sedimentary system in the southern margin of the basin, the braided delta sedimentary system in the northern margin of the basin and the alluvial fluvial sedimentary system developed in the early SQ1 sequence and the late SQ5 sequence. The first three are mainly distributed in SQ2SQ3 and SQ4 sequences. Tectonic activity and paleogeomorphology control the distribution of sedimentary systems. The assemblage can be divided into top type, normal type and autogenic type SQ2 / SQ3 and SQ4 sequence can form beneficial reservoir / caprock assemblage, predict favorable oil source area and reservoir area, dark mudstone in transgression period is the most favorable oil source area. Sand bodies in low and high stages are favorable reservoir areas.
【作者单位】：东北石油大学地球科学学院;
【基金】：东北石油大学培育基金资助项目(XN2014119) 国家自然科学基金资助项目(U1262106)~~
【分类号】：P539.2;P618.13

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