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本文扼要介绍长源距声波测井(DDBHC)的原理和它在识别岩性、确定孔隙度以及识别裂缝等方面的应用。其中较为详细地讨论了用全波波形-变密度测井来识别裂缝的问题。以四川碳酸盐岩剖面为例,说明不同产状的裂缝在全波波形-变密度曲线上有不同的特征。并已证实,该方法配合双侧向油线和裂缝识别曲线(FIL)等,对区分水平缝、垂直缝、网状缝及孔隙-裂缝带具有一定的效果。对经计算中心处理后的波形分析及对曲线研究表明,在碳酸盐岩剖面上鉴别岩性和识别裂缝也是大有前途的。
This article briefly describes the principle of DDBHC and its application in identifying lithology, determining porosity, and identifying cracks. The problem of identifying cracks with full-wave waveform-variable density logging is discussed in more detail. Taking the carbonate rock profile in Sichuan as an example, it shows that different fractures have different characteristics in the full waveform - variable density curve. It has also been confirmed that this method, combined with double-sided oil lines and fracture identification curves (FILs), has some effect on distinguishing horizontal, vertical, reticular and pore-fracture zones. Waveform analysis and plotting of curves after processing by the calculation center shows that it is also promising to identify lithology and identify fractures in carbonate profiles.