收稿日期: 2011-05-31
修回日期: 2011-08-02
网络出版日期: 2011-10-10
基金资助
国家重大科技专项(编号： 2008ZX05001-004-04)资助.
Genesis of Delta Front Sand and Characteristics of Chang 8 StratigraphicalOil Pools in Maling-Zhenbei Area
Received date: 2011-05-31
Revised date: 2011-08-02
Online published: 2011-10-10
鄂尔多斯盆地马岭—镇北地区延长组三角洲前缘是主要的油气储集带,主要存在2个不同类型的沉积体系：东北物源方向的远源三角洲沉积体系和西南、西部的辫状河三角洲沉积体系。将马岭—镇北地区长8油组的储层砂体沉积微相分为水道、河口坝两大类,水道又细分为：①具有正常沉积特征，在三角洲前缘形成的水下分流河道；②具有砂质碎屑流和正常牵引流混合特点，且厚度较大的深切水道；③具有碎屑流性质，滑塌或者浊积性质的扇内水道等三小类。根据每个储存砂体沉积微相的成因，将马岭—镇北油藏类型划分为：水道—河道型、浊积扇型和河口坝型3种岩性油藏类型。对砂体成因和岩性油气藏特征的细致探讨不仅可以提高该地区储层预测的准确性，而且在某种程度上为今后的勘探和开发提供指导。
张其超, 王多云, 李建霆, 李树同, 辛补社, 左博, 刘军锋 . 马岭—镇北地区长8段三角洲前缘砂体成因与岩性油气藏特征[J]. 天然气地球科学, 2011 , 22(5) : 807 -814 . DOI: 10.11764/j.issn.1672-1926.2011.05.807
The delta\|front zone of Yanchang Formation in the Maling\|Zhenbei area of Ordos basin is one of the important oil reservoir.Two different sedimentary systems in this area are the far source delta sedimentary system along the northeastern source direction and the western braided river delta sedimentary system.The microfacies of sand reservoir in the Chang 8 oil pools in the Malin-Zhenbei area are divided into mouth bars and channels.The channel microfacies can be further categorized into [JP2]three types as follows:(1) subaqueous distributary channels formed in the delta-front margin with normal depositional features;(2) subaqueous deep\|incised channels with both the sandy debris-flow and drag flow features;(3) waterways in fans with the comprehensive characteristics of sandy debris-flow,slump or turbidite.According to origin of reservoir sedimentary facies formation,the Maling-Zhenbei oil pools can be divided into three types:channel-waterways,turbidite fans and mouth bars.The genesis of sandy bodies and stratigraphical reservoirs not only improve the accuracy of reservoir prediction,but help to guide the petroleum exploration.
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