摘要
运用沉积学、层序地层学原理和方法,依据丰富的岩心和测井资料,对塔里木盆地哈得逊地区下石炭统下泥岩段海相薄层产油砂体进行精细研究。研究结果:该套薄层砂体是塔里木盆地石炭系层序Ⅰ高位体系域的低能砂质滨岸相沉积,发育的多个明显向上变粗的准层序又构成一个(弱)前积准层序组。层序Ⅰ高位体系域发育早期为远滨环境,随着海平面的缓慢下降逐渐过渡为远滨和临滨—前滨环境交互,最后演变为滨海平原。识别出的5 个单独薄砂体由下向上逐渐向海迁移,砂体间由海相泥岩分隔,互不连通,呈孤立的席状透镜体,侧向相变为泥岩;平面上砂体沿古海岸线发育,其走向大致为北西南东向。薄层砂体砂岩粒度细、厚度薄(薄于3m),但分布广,发育明显受层序(体系域)背景、古地貌和物源控制,其分布面积远大于已知油田的面积,有希望寻找到主要受岩性控制的较大型地层油气藏。
Rich information from cores and well logs, principles and tools of sedimentology and high-resolution sequence stratigraphy, were used for a delicate sequence analysis of the thin marine reservoirs in lower-mudstone section, Lower Carboniferous in Hade area, Tarim Basin, which are low energy sandy coastal sediments of highstand system tract of sequence I, consisting of many shallow-up coarse para-sequences which builds an aggression parasequence set. With the slow fall of sea level, the environment of HST was gradually changed to the alternative environments of offshore and shoreface-foreshore, and finally changed to coastal plain. Five thin-sand-beds are separated by marine mudstone into isolated sheet lenticles, and changed to mudstone laterally. The sand direction is nearly NW to SE, distributed along palaeo-shoreline. These beds are obviously controlled by sequence setting, palaeo-geomorphology and sediment supply. Some huge stratigraphic reservoirs mainly controlled by lithology could be the potential petroleum play targets.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2005年第2期43-45,共3页
Petroleum Exploration and Development
关键词
塔里木盆地
下石炭统
海相
薄层砂体
高分辨率层序地层学
沉积相
砂体预测
Tarim Basin
Lower Carboniferous
marine facies
thin sand bed
high-resolution sequence stratigraphy
sedimentary facies
sandbody forecasting
