摘要
南贝尔凹陷位于蒙古国塔木察格盆地,为中生代断陷盆地内小断陷。该凹陷具有断陷结构简单、多凸多凹、凹隆相问的构造格局,形成了多物源、多沉积中心的特点。铜钵庙组三角洲前缘砂体、南屯组(扇)三角洲前缘砂体和水下扇砂体为油气聚集成藏提供了良好的储集空间。在东次凹北洼槽南一段Ⅱ油组构造和沉积匹配较好的区域形成构造和岩性控制的岩性一构造油藏;在东次凹南洼槽由于砂泥互层居多,纵向上含油层位多,形成复式油藏,而只有在北洼槽的南一段Ⅱ油组储层相对集中,形成了以岩性控制为主的构造一岩性油藏。构造沉积背景、烃源灶、不整合面和不同级别的湖泛面,控制了油气在平面和纵向上的分布。
The South Buir is located in Tamtsag of Mongolia,being Mesozoic rifted basin.The half grabenlike fault depression with eastfault and westoverlap has the characteristics of multi source and multi depocenter,with simple faulted texture,and the tectonic framework of multi depressionmulti uplift and depression alternated,with uplift.The delta front sandbody in Tongbomiao Formation,the subsea apron sandbody and fandelta front sandbody in Nantun Formation provide good reservoir space for hydrocarbon accumulation.Lithologystructure reservoir of pay zone II of member I were developed in the north sag of east subdepression which had preferable structure coupled with deposition; sandstone interbeded with mudstone were developed well in the south sag of east subdepression which vertically had many oilbearing layers,so south sag of east subdepression could form composite reservoir.Many reservoir of pay zone II of member I concentrated relatively in the south sag which could lead to lithologystructure reservoir controlled by lithology.Structural depositional setting,hydrocarbon kitchen,unconformable surface and variousgraded flooding surfaces control the lateral and vertical hydrocarbon distribution.
出处
《地质科学》
CAS
CSCD
北大核心
2011年第4期1094-1105,共12页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国石油天然气集团公司重点项目"海塔盆地岩性地层油气藏富集规律与目标评价"(编号:2008ZX05001-005)资助
关键词
塔木察格
断陷盆地
烃源灶
扇三角洲
构造沉积背景
Tamtsag, Rifted basin, Hydrocarbon kitchen, Fan-delta, Structural depositional setting
