华北地区晚三叠世岩相古地理特征

发布时间：2018-04-30 06:40

本文选题：岩相古地理 + 沉积相　；参考：《岩性油气藏》2016年05期

【摘要】：由于前人对华北地区晚三叠世岩相古地理的系统研究较少,其沉积格局及演化规律尚不明朗。基于层序地层学理论,根据华北地区上三叠统整体发育特征,将其划分为卡尼阶和诺利—瑞替阶共2个等时地层单元,并以优势相法分别编制了岩相古地理图。晚三叠世华北地区整体上东高西低,地层东薄西厚,以陆相沉积为主。主要沉积区位于鄂尔多斯盆地和南华北地区,前者为开阔的内陆坳陷湖盆,岩相北粗南细,厚度北薄南厚,沉积中心偏南,上三叠统油气资源主要分布于盆地中西部地区;后者由一系列小型湖盆组成,沉积中心位于西北部,以济源地区上三叠统最为发育,其他地区仅为零星分布,储层物性总体较差,上三叠统油气资源匮乏。通过对华北地区晚三叠世岩相古地理的研究,明确了盆地演化、沉积体系、烃源岩、储集层的时空分布规律及其相互关系,认为主要存在自生自储、上生下储和下生上储等3种生储盖组合类型,指出了鄂尔多斯盆地盐定三角洲、环县三角洲、甜水堡三角洲和环县—甘泉地区以及济源盆地为其油气勘探的有利方向。
[Abstract]:Due to the lack of systematic studies on the late Triassic lithofacies and paleogeography in North China, the sedimentary pattern and evolution law are still unclear. Based on sequence stratigraphy theory and according to the overall development characteristics of Upper Triassic in North China, it is divided into two isochronous stratigraphic units, Carney stage and Nolli-Rayti stage, and lithofacies paleogeographic maps are compiled by dominant phase method. In the late Triassic North China, the upper east is high and the west is low, and the strata are thin and thick in the east and west. The main sedimentary area is located in Ordos Basin and South North China, the former is an open inland depression lake basin, the lithofacies is thick and thin in the north, thick in the north and south, and the sedimentary center is southward. The oil and gas resources of the Upper Triassic are mainly distributed in the central and western part of the basin. The latter is composed of a series of small lacustrine basins, the sedimentary center is located in the northwest, the Upper Triassic in Jiyuan area is the most developed, the other areas are scattered, the reservoir physical properties are poor in general, and the Upper Triassic oil and gas resources are scarce. Based on the study of late Triassic lithofacies and paleogeography in North China, the temporal and spatial distribution of basin evolution, sedimentary system, source rock and reservoir and their relationship are determined. There are three types of assemblages of upper and lower reservoirs and upper reservoirs. It is pointed out that Yanding delta, Huanxian delta, Tianshuibao delta, Huanxian-Ganquan area and Jiyuan basin are favorable directions for oil and gas exploration in Ordos basin, Huanxian delta, Tianshuibao delta and Huanxian-Ganquan area, as well as Jiyuan basin
【作者单位】：山东科技大学地球科学与工程学院;
【基金】：国家自然科学基金面上项目“沁水盆地煤层气与致密砂岩气共生成藏机理研究”(编号:41172108) 国家油气重大专项“十三五”课题“中深层煤系地层立体勘探有利目标优选”(编号:2016ZX05041005)和“岩性地层油气藏区带、圈闭评价方法与关键技术”(编号:2016ZX05001003)联合资助
【分类号】：P618.13;P534.51

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