银根-额济纳裂谷盆地群凹陷结构样式及对成藏的控制  

DEPRESSION STRUCTURE-STYLE TYPES AND PETROLEUM ACCUMULATION,RIFT BASINS GROUP OF YINGEN-EJINA

作　　者：陈启林[1] 杨占龙[2] 关银录[2] 卫平生[2] 

机构地区：[1]中国地质大学,北京100083 [2]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《天然气地球科学》2005年第5期559-563,共5页Natural Gas Geoscience

基　　金：中国石油天然气集团公司"九五"攻关项目"银根-额济纳旗盆地油气地质特征综合评价"(编号:980208-34-03);中国石油天然气股份公司"石油重大勘探领域预探与目标评价"项目子课题"中西部地区中小盆地石油预探区带与目标评价"(编号:010107-10-6)资助

摘　　要：通过对银根-额济纳裂谷盆地群各类典型凹陷结构样式的研究,指出研究区发育单断型和双断型凹陷,单断型可进一步划分为单断断阶式、单断断槽式和单断断超式,双断型主要为双断地堑式。通过对白垩系和中下侏罗统2套构造层关系的研究,指出单断型凹陷可划分为单断叠置型和单断迁移型2种。认为不同结构样式凹陷烃源岩的展布和保存条件不同,烃源岩的发育主要受沉积中心的次级“洼槽”控制;继承性发育的凹陷烃源岩条件最好,可与缓坡带多级断阶带的局部构造圈闭、缓坡带的超覆砂体形成良好配置;迁移型凹陷的烃源岩常遭受一定程度的剥蚀,中下侏罗统烃源岩与地层不整合圈闭可形成较好配置;单断型凹陷缓坡超覆带是形成地层油气藏的最有利带,缓坡多级断阶带是构造油气藏的最有利带。Studies of depression structure-styles show there are variant typical depressions in Yingen-ejina rift group basins, which are single-fault depression and double-fault depression. The single-fault depressions may classify in detail as the following： single fault bench type; single fault trough type and single fault overlap type etc. The double-fault depression mainly be double fault graben type. According the relationship of Jurassic and Cretaceous structural layers, these depressions may be classified into two types： single fault overriding depression and single fault migration depression. Hydrocarbon source rocks in different structure-style type of depressions have variant states of distribution and conservation. Distribution of source rock is mainly controlled by sub-trough of each depocenter. Source rock in succeed depression is in good condition and well disposed with local structural traps in stage faults zone and overlap sandstone bodies of plain slope. The source rock in migration depression is eroded in some degree, but the source rock of middle-lower Jurassic is well deposed with the stratigraphic non- conformity traps. So, the overlap zone in plain slope of single-fault depression is prospecting in stratigraphic traps exploration and stage fault bench zone in plain slope is favorable in structural traps.

关 键 词：裂谷盆地群 凹陷结构样式 缓坡超覆带 多级断阶带 

分 类 号：TE121[石油与天然气工程—油气勘探]