摘要
利用地震资料,结合地质、钻井资料,对东濮凹陷文留地区盐岩的物理性质、地震反射特征、几何形态、与盐岩相关油气藏的类型进行了研究。发现盐岩具有密度恒定特性(低密度)和速度稳定特性(高速度),基本不随深度变化。盐岩与砂泥岩体之间有较强的波阻抗差,因而其界面反射特征明显。但盐岩的流动特性造成盐岩体有多种赋存状态,它们的地震反射特征各不相同,这是盐岩解释的主要困难。利用地震资料识别归纳出盐层(体)解释判定模式,认为本区盐岩主要有3种赋存状态:原生板状盐岩、后生变形盐岩和次生盐墙。盐岩流动变形及相变形成了3类油气藏:盐上堑式背斜油气藏、盐侧向封堵油气藏和盐下盐背斜油气藏。
The physical properties, seismic reflection features, geometry and halite-related hydrocarbon accumulation types in the Wenliu oilfield of the Dongpu subbasin were studied by using seismic reflection data, combined with geological and drilling data. The studies show that halite is characterized by a constant low density low and a high stable velocity, which in the main do not change with depth. The boundary between halite and areno-argillaceous rocks show distinct reflection features because there is a strong impedance difference between them. However, due to the flow feature, halite has several modes of occurrence and their seismic reflection features are different, which makes it difficult to recognize halite. A discrimination model for halite beds （bodies） has been summarized by using seismic data. There are three main modes of occurrence for halite in the study area： primary platy halite, post-deformational halite and secondary salt wall. The flow deformation and facies change of halite formed three types of hydrocarbon accumulations, namely, graben-type anticlinal accumulations above salt, lateral salt-sealed accumulations and anticlinal accumulations below salt.
出处
《地质力学学报》
CSCD
2007年第4期348-354,共7页
Journal of Geomechanics
关键词
东濮凹陷
文留油田
盐岩
地震反射特征
油气藏
Dongpu subbasin
Wenliu oilfield
halite, seismic reflection characteristics
hydrocarbon accumulation
