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引言众所周知,威里公式在均匀粒间孔隙储集层已得到广泛的应用,但对孔隙空间复杂和非均匀的碳酸盐储集层就明显不适应。实践表明,用它计算的孔隙度往往偏低。目前,国内外都有人认为声速测井资料不反映碳酸盐岩的次生孔隙度,而想法改进威里公式。如国外的米瑟通过四口井的岩芯孔隙度和声速资料得出△t=△t~φ·△t_(ma)~(1-φ)的经验关系。此关系在四川碳酸盐岩应用表明,对高孔隙度储集层,计算的孔隙度和岩芯孔隙度符合较好,对低孔隙度储集层则差别较大。华东石油学院楚泽涵同志在“用声波测井方法估算碳酸盐储集层孔隙度的探讨”一文中,从声传播的机理出发,提出声时差反映绕行洞穴的表面波的观点和新的估算公式,这是一个很大的进步。本文在综合研究了声传播机理和仪器的接收特性以后,提出新的计算模型,推出更接近实际情况的理论公式,供矿场试用。
Introduction It is well known that the Weili formula has been widely used in uniform intergranular pore reservoirs but obviously not suitable for carbonate reservoirs with complex and non-uniform pore spaces. Practice shows that porosity calculated using it tends to be low. At present, there are people both at home and abroad that the sonic logging data do not reflect the secondary porosity of carbonate rocks, and the idea of improving the Weili formula. For example, Misee abroad derived the empirical relationship of Δt = Δt ~ φ · Δt_ (ma) ~ (1-φ) from the core porosity and sound velocity data of the four wells. The application of this relationship in Sichuan carbonate shows that the calculated porosity and core porosity agree well with high-porosity reservoirs and the difference with low-porosity reservoirs. Comrade Chu Ze-han from East China Petroleum Institute, in his article “Discussion on Estimating Porosity of Carbonate Reservoirs by Acoustic Logging Method”, put forward the viewpoint and new idea of acoustic time difference reflecting the surface wave of detour caverns The estimation formula, this is a big step forward. After comprehensively studying the acoustic propagation mechanism and the receiving characteristics of the instrument, a new calculation model is proposed and a theoretical formula closer to the actual situation is put forward for the field trial.