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珠江口盆地白云深水区含气储层AVO模板的建立及应用
李杰,郑金云,张忠涛,朱焱辉,陈兆明,张明,郭佳,刘灵
中海石油(中国)有限公司深圳分公司
摘要:
白云深水区多口油气钻探揭示砂质储层含气和含水都有可能表现为III类或IV 类的AVO及亮点异常,单纯依靠亮点+III类AVO异常进行烃类气体预测具有多解性,是钻前储层的流体预测面临的新挑战和难点。本文利用珠江口盆地白云深水区测井数据,根据储层特征与含气性差异性优选了多口测井数据齐全井,利用测井数据对不同井位储层段的AVO特征进行分析。通过Aki-Richards公式计算了不同井的截距和梯度属性,建立了白云深水区P-G属性图版。对比分析发现不同含气储层,随着岩性、含气性差异及其岩性组合不同,呈现不同AVO异常特征,岩心分析表明该异常不仅与储层含气性有关,也与盖层岩性密切相关,尤其是当盖层或者储层含有灰岩时,对AVO异常影响较大。利用M矿区目标储层的叠前反演弹性参数,再结合本文建立的P-G属性图版和流体识别因子方法,对目标储层含气性进行了预测,发现了该储层在横向上含气性不同,钻探结果证实预测结果有效与可靠,表明该AVO模板具有较好的实用性。
关键词:  AVO异常  含气性  叠前反演  白云深水区
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The AVO template and its application for gas-bearing reservoir in the deep water of Baiyun area, the Pearl River Mouth Basin
Li Jie1, Zheng Jinyun1, Zhang Zhongtao1, Zhu Yanhui1, Chen Zhaoming2, Zhang Ming2, Guo Jia2, Liu Ling2
1.CNOOC China Limited, Shenzhen Branch;2.CNOOC China Limited,Shenzhen Branch
Abstract:
Several drilled sites in the Baiyun deep water area revealed that sandstone reservoirs of gas-bearing and water-bearing sediments may be manifested as the AVO of type III or type IV and bright spot anomalies. The prediction of hydrocarbon gas relying on the bright spot and AVO anomaly of type III has uncertainty, which causes the prediction of reservoir fluid before drilling to be difficult. Based on well logging data in Baiyun deep-water area, the Pearl River Mouth basin, the characteristics of AVO reservoir was analyzed from the well log data and the obvious differences between reservoir characteristics and gas-bearing are found. The intercept and gradient properties of different wells were calculated using the Aki - Richards formula to establish the crossplot between P and G attributes in the study area. The anomalies of AVO influenced by lithology, gas-bearing and lithological combination showed different characteristics. The core analysis indicated that the AVO anomalies were not only related to the gas-bearing property of the reservoir, but also closely related to the lithology of the overlying strata, especially when the overlying strata or the reservoir contained limestone. The prestack inversion elastic properties of the target reservoir in M area, combined with the P&G attribute and fluid factor established in this paper, were used to predict the reservoir properties of gas saturation. The drilling results proved that the gas saturation is variable in later and AVO template can predict reservoir properties better, which indicates the AVO template is effective and reliable.
Key words:  AVO anomalies, gas-bearing, prestack inversion, Baiyun deep water area.
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