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查干凹陷是一个发育于晚古生代褶皱基底的中、新生代陆相断陷盆地。在早白垩世断陷期,该凹陷存在明显的两期火山活动,致使下白垩统苏红图组发育以玄武岩和安山岩为主的火山岩。本文利用研究区已钻各井的自然伽马(GR)、电阻率(RT)、自然电位(SP)和声波时差(AC)4条特征测井曲线,结合岩心和录井研究成果,在充分认识火山岩电性特征基础上,初步建立了火山岩岩电关系。该区火山岩与周围沉积岩相比具有低GR、高RT、低AC等特征,利用AC-GR和SP-GR交会图可进一步细分玄武岩和玄武岩。
The Chagan depression is a Meso-Cenozoic continental rift basin developed in the late Paleozoic fold basement. During the Early Cretaceous rifting, there were two distinct volcanic activities in this depression, which led to the development of basalt and andesite volcanic rocks in the Lower Cretaceous Suhongtu Formation. In this paper, four logging curves of natural gas (GR), resistivity (RT), natural potential (SP) and acoustic time difference (AC) of each well that has been drilled in the study area are used. Combining the core and well logging results, On the basis of understanding the electrical characteristics of volcanic rocks, the relationship between volcanic rocks and rock and electricity has been preliminarily established. Compared with the surrounding sedimentary rocks, the volcanic rocks in this area are characterized by low GR, high RT and low AC. The basalt and basalt can be further subdivided by the cross-plot of AC-GR and SP-GR.