川东南旺隆及周边地区T_1j~(2-1)-T_1j~1储层地球物理响应特征分析

摘要

T_1j~(2-1)- T_1j~1(Lower Traissic Jialingjiang Formation) reservoirs in Southeast Sichuan are characterized by thin single layers, low porosity, low permeability, strong heterogeneity and highly difficult exploration. By analysing various geological characteristics of T_1j~(2-2),T_1j~(2-1) and T_1j~1 formations and log curves, the synthetic seismogram and fine models are built and the seismic responses of reservoirs in Wanglong and surrounding area studied. Seismic attributes to predict reservoirs are extracted. The results show that the phenomena of a moderate-strong amplitude, dropping-down phase axis, bifurcating phase axis and low frequency represent favorable reservoirs. The prediction of seismic attributes shows that favorable reservoirs grow in Taihe and Wanglong, according with the drillings. All these illustrate that the method can well predict the distribution of reservoirs and provide the basis for a further exploration.%川东南地区嘉陵江组T_1j~(2-1)-T_1j~1碳酸盐岩储层具有低孔隙度、低渗透率、单层厚度薄、非均质性强的特征,勘探难度较大.综合考虑T_1j~(2-2),T_1j~(2-1)和T_1j_1地层的地质特征,通过地质、测井进行合成记录层位标定,建立正演模型, 探讨了旺隆及周边地区储层的测井响应特征和地震响应特征,提取了地震属性对储层进行横向预测研究.结果显示,中-强振幅、同相轴下拉、同相轴分叉、频率降低现象代表储层发育.地震属性分析结果表明太和、旺隆地区储层较发育,这与钻井显示较吻合,说明该方法可以较好地预测出该套储层的分布范围,为进一步勘探提供了依据.