基准面变化与岩相及砂体展布的沉积响应
——以鄂尔多斯盆地苏南地区盒八段辫状河三角洲为例

Sedimentary response of base-level to lithofacies and reservoirs sand body distribution:
a case of braided delta in 8th Member of Shihezi Formation, southern Sulige Area,
Erdos Basin

 李志华¹ 黄文辉¹ 朱伟厚²

中国地质大学（北京）能源学院，北京 100083 中国石化中原油田分公司工程技术管理部，河南 濮阳 457001）

School of Energy Resources, China University of Geosciences, Beijing 100083, China Engineering Management Department,Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China)

 为了弄清岩相变化及砂体展布样式的成因，文中针对基准面升降分析了其与岩相及砂体展布的沉积响应关系。以高分辨率层序地层学理论为指导，结合岩心、测井曲线在基准面变化时的识别标志，将鄂尔多斯盆地苏南地区盒八段划分为上、下2个小段，各小段又分2个IV级层序（中期旋回）。建立研究区层序地层格架，选取垂直物源和顺物源2条连井剖面，刻画剖面砂体展布样式，厘清了基准面变化与砂体展布的沉积响应关系，并在此基础上，建立了河流及三角洲相基准面升降与岩相和砂体展布的响应模式。

 In order to find out the origin of lithofacies variation and sand body distribution pattern, the sedimentary response of base-level to lithofacies and reservoirs sand body distribution are analyzed. Taking the braided delta in 8th Member of Shihezi Formation in southern Sulige as an example, according to the theory and approach of high-resolution sequence stratigraphy, based on core and well-logging as identification marks of base-level, the 8th Member of Shihezi Formation in southern Sulige is divided into two Members: the Upper 8th Member and the Lower 8th Member, both of which are divided into two fourth-order sequences respectively. The sequence stratigraphic framework is established, and two profiles, one perpendicular to the direction of the source and the other parallel with the direction of the source, are selected to describe the characteristics of sand body distribution. The sedimentary response of base-level to lithofacies and reservoirs sandbody distribution is analyzed. Based on the response, the sedimentary response model of fluvial and delta is established.

10.6056/dkyqt201606006