杭锦旗地区杭南区块J6井区砂岩体的识别

Comprehensive identification of sand body of borefield J6 in Hangjinqi area

1. 中国石化华北石油局第四物探大队物探研究院,河南新乡 453700;2. 中国地质大学地球物理与空间信息学院,湖北武汉 430074

Geophysical Institute of No. 4 Geophysical Prospecting Corporation, Xinxiang 453700, China

杭锦旗地区杭南区块构造简单,勘探程度较低,储层为隐蔽性岩性圈闭,井位选取比较困难。为此,采用综合识别方法对该区块J6井区的砂岩体进行了识别,并进行了含油气性预测。①通过对地震剖面反射特征的分析,确定反射异常带;②通过对测井曲线特征的分析、岩性对比和地震模型正演,对异常进行解释;③利用波阻抗反演、地震属性分析技术,圈定砂岩体的展布范围;④通过对沉积环境、烃源岩、封堵性的研究,分析砂岩体的含气性,确定是否为岩性圈闭。最终解释结果为J6井山1段底部的砂岩体含气。

The reservoir is lithologic trap subtly in Hangnan block. There are abnormal seismic reflections in well J6 area. It is reckoned that the sand body at the base of Shan 1 section by means of comparison between different well logs and lithology, and forward modeling analysis caused these abnormal seismic reflections. Using wave impedance sections, instantaneous frequency sections and extraction of seismic attributes identified this sand body. Lithologic trap may be formed at the base of Shan 1 section according to the results of the sedimentary environment, source rocks, cover layers study, which points out a new target for natural gas exploration in this area.