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ECS测井是一种能从岩石化学成分角度解决岩性识别问题的测井方法。在研究区进行岩石类型划分时,首先根据Si-Fe交会图,把火山岩分为基性岩、中性岩、酸性岩三大类,然后再根据全碱含量与特征元素交会图进一步细分为六类。每一类的侵入岩与喷出岩在化学成分上相近,但由于形成环境不同,他们的结构有显著差异。在构造发育、岩性复杂的区块,可根据ECS资料识别出的岩性,进行相带划分。钙碱性玄武岩全碱含量高,CaO、(FeO+Fe2O3)、MgO较低;碱性玄武岩矿物成分为橄榄石、富钛及钙的单斜辉石、斜长石、碱性长石。据此,我们将X17井区石炭系的玄武岩进行细分,使该区块的井间对比更精细。划小地层单元,对于油气分布规律的研究具有重要意义。
ECS logging is a logging method that can solve lithology identification problems from the perspective of petrochemical composition. According to the cross-plot of Si-Fe, the volcanic rocks are divided into three types: basic rock, neutral rock and acidic rock, and then further subdivided according to the cross-plot of total alkali content and characteristic elements Six categories. Each type of intrusive rock and spout rock in the chemical composition is similar, but due to the formation of different environments, their structures are significantly different. In structurally developed and lithologically complex blocks, the zoning can be divided according to the lithology identified by ECS data. Calcium alkaline basalts have high total alkali content, CaO, (FeO + Fe2O3) and MgO, while alkaline basalts have olivine, clinopyroxene and alkaline feldspar. Based on this, we subdivided the Carboniferous basalts in the X17 well to make the cross-well comparison more subtle. Planning for small stratigraphic units is of great significance for the study of the law of oil and gas distribution.