收稿日期: 2008-03-11
修回日期: 2008-05-20
网络出版日期: 2008-06-10
Characteristics of Abnormally High Porosity Zone andFavorable Reservoir Facies Prediction in Deep Cenozoic Horizon of Qingshui Sag
Received date: 2008-03-11
Revised date: 2008-05-20
Online published: 2008-06-10
根据岩心实测孔隙度、薄片观察、铸体薄片和扫描电镜等实际资料,将辽河盆地西部凹陷清水洼陷新生界成岩作用划分为早成岩阶段和中成岩阶段2个阶段,其中包括5个亚期,指出该洼陷新生界纵向上发育3个异常高孔带,这种异常高空带的形成与大气降水淋滤作用和有机酸对储层的溶蚀作用有关。通过数值模拟预测了深层沙三段成岩阶段和成岩相的横向展布规律,并利用叠合沉积相与成岩相的方法,预测了沙三段的有利储集相分布，指出有利储集相主要发育在辫状分流沟道微相,处于早成岩阶段B期—中成岩阶段A1期的溶蚀成岩相区。认为对异常高孔带和有利储集相的预测可为该区深层岩性油气藏的勘探提供科学依据。
谷团, . 辽河盆地西部凹陷清水洼陷新生界深层异常高孔带特征与有利储集相预测研究[J]. 天然气地球科学, 2008 , 19(3) : 327 -333 . DOI: 10.11764/j.issn.1672-1926.2008.03.327
The measured porosity data and the observations of thin sections and blue epoxy resin-impregnated thin sections show that the diagenesis in the Qingshui sag can be divided into two stages and five substages. There exist three abnormally high porosity zones vertically in the Cenozoic reservoirs in the Qingshui sag, Liaohe Depression, whose genesis is related to the eluviation of precipitation and the dissolution of organic acid. The diagenetic stages and the vertical distribution of diagenetic facies have been predicted through numerical simulation. By the way of superposing the diagenetic facies map on the sedimentary microfacies map, favorable reservoir facies has been predicted. The prediction result indicates that the favorable reservoir facies is located in the joint area of the braid branch channel and the dissolution facies in the early diagenetic stage B period to the middle diagenetic stage A1 period.
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