珠江口盆地番禺天然气区珠江组高速泥岩盖层及其分布综合研究

Comprehensive Study on High-speed Mudstone Cap-rocks in Panyu Gas Field of Zhujiang Formation in Pearl River-mouth Basin

研究了珠江口盆地番禺低隆起-白云凹陷北坡番禺天然气区珠江组上覆高速泥岩盖层的岩石物理特性,并且分析研究了泥岩盖层与储层物性的相关性。研究结果表明,番禺天然气区存在厚度不等的珠江组高速泥岩盖层,并且有高速泥岩盖层覆存的地区储层物性普遍较好。因此,采用叠前反演技术获得的密度属性体来识别高速泥岩盖层,并在密度属性体上解释分析了高速泥岩盖层的分布区域。该高速泥岩盖层研究成果与砂岩储层预测结果的联合使用,可提高储层预测及储层物性预测的准确度。

The rock physical properties of high-speed mudstone caprocks overlying on Zhujiang Formation of Pearl River-mouth Basin of Panyu low uplift-Baiyun Sag in North Slope of Panyu Gas Field were studied,the correlation between the cap rocks and reservoir characteristics was analyzed.The results show that there are several different thickness levels of high-speed mudstone cap rocks in Zhujiang Formation,the reservoir properties are generally good when there is high-speed mudstone overlying on the area.Therefore,the density attribution is used to identify the high-speed mudstone cap rocks by pre-stack inversion techniques,and then explain the distribution of the cap rocks in the density body.The study result can be used jointly with the sandstone reservoir prediction result;it helps to improve the prediction accuracy.