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深水浊积砂岩油气藏是当今世界油气勘探开发的热点目标,西非安哥拉深水区油气资源丰富、潜力巨大.该区第三系深水浊积砂岩埋深浅、成岩作用弱,致使地震反射纵波速度及其阻抗对有利砂岩储层和围岩的区分效果不明显;基础数据的制约如部分井声波或密度资料缺乏或存在质量问题等,给利用井震信息开展地震反演预测带来严重影响.本文旨在研究一套适合该地区储层预测的弱固结浊积砂岩岩石物理技术.为此,通过实际资料的反复论证,提出了拟合推理法确定矿物骨架弹性参数,并对等球颗粒模型进行了改进,创建了适合该地区弱固结浊积岩岩石物理模板,实现了测井曲线的合理校正和横波预测.以此为基础,进一步开展了叠前地震反演和储层的分布预测.结果表明,浊积砂储层预测精度达85%.因此,该岩石物理技术在西非深水区弱固结浊积砂岩的应用是可行的.
Deep-water turbidite sandstone reservoirs are the hot targets of oil and gas exploration and development in the world today, and the Angola deep-water region in West Africa is rich in oil and gas resources with great potential. The Tertiary deep-water turbidite sandstone in this area has a shallow depth and low diagenesis, resulting in seismic reflection P-wave velocity and its Impedance has no obvious effect on the discrimination of favorable sandstone reservoirs and surrounding rocks; the restriction of basic data such as the lack of sound or density data of some wells or the existence of quality problems will seriously affect the prediction of seismic inversion using well information. In this paper, a set of weakly-consolidated turbidite sandstone petrophysical techniques that are suitable for reservoir prediction in this area is studied.Through the repeated demonstration of the actual data, a fitting inference method is proposed to determine the elastic parameters of the mineral skeleton and the isospheric particle model After the improvement, the rock physical model for weak consolidation turbidite in this area has been established, and the log curve correction and shear wave prediction have been realized. Based on this, the prestack seismic inversion and the prediction of reservoir distribution are further carried out. The results show that the prediction accuracy of turbidite reservoirs is up to 85%, so the application of this petrophysical technique to the weak consolidation turbidite sandstone in the deepwater of West Africa is feasible.