川东北黄龙场地区嘉二段非均质储层发育区地震预测

Seismic prediction of heterogeneous reservoirs in the 2nd member of the Lower Triassic Jialingjiang Formation in the Huanglongchang area,northeastern Sichuan Basin

四川盆地东北部黄龙场地区下三叠统嘉陵江组二段存在大型断背斜圈闭,其有利滩相储层发育特征研究是该段油气勘探开发的关键。在构造研究和储层测井响应特征综合分析的基础上,结合储层沉积微相特征,对储层主要发育段(嘉二2亚段)采用多种方法进行了综合预测。利用地震属性与地震反演技术相结合预测出嘉二2亚段强振幅能量异常、低密度异常滩相储层平面主要分布在构造高部位及斜坡地带;多参数反演技术预测了储层的物性特征,地震相干体技术与频谱分析技术综合预测出储层的裂缝发育区,这是该区优质滩相储层地震预测成功的关键。综合分析结论认为:该亚段最有利的滩相储层主要分布在HL2井东南高部位及其斜坡带以及HL5井的西部,应是研究区内嘉二段下一步油气勘探开发的重点区域。

Large faulted anticline traps occur in the 2nd member of the Lower Triassic Jialingjiang Formation(t1j2) in the Huanglongchang area,northeastern Sichuan Basin,and the identification of reservoir characteristics of bank-facies is the key to hydrocarcon exploration here.Various methodologies were used to predict reservoirs in the second interval of the 2nd member of the Jialingjiang Formation(t1j22) through the analysis of structures,reservoir logging responses,and the features of sedimentary microfacies of the reservoirs.Seismic attributes and seismic inversion techniques were integrated to predict reservoir distribution.The results show that reservoirs of bank-facies with strong amplitude anomaly and low density anomaly in the t1j22are mainly distributed on the structural highs and slopes.Multiple-parameter seismic inversion technique was used to predict the physical properties of the reservoirs.Coherence cube and spectrum analysis techniques were integrated to predict the zones with well-developed fractures.Based on the comprehensive analysis,it is believed that the most favorable reservoirs of bank-facies in t1j22 occur on the structural highs and their slopes to the southeast of well HL2 as well as on the area to the west of well HL5,which will be the highlights of further hydrocarbon exploration and development in this study area.