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塔河地区二叠系发生过多次火山喷发,火山岩广泛发育,经过多次构造演化可能形成油气聚集的有利圈闭。由于火成岩岩性成分复杂,不同地区不同时期形成的火成岩岩性差异大,岩性不均一性强,分布范围广泛而散乱,厚度变化大,在地震剖面上反应不明显等等,造成火成岩识别困难。本文综合多口井的资料,利用交会图和测井曲线对火成岩岩性进行了识别研究,总结了本地区火成岩的岩性特征,取得了较好的认识。
There are many volcanic eruptions in the Permian in the Tahe area, and the volcanic rocks have been widely developed. After several tectonic evolutions, favorable traps of hydrocarbon accumulation may form. Due to the complicated lithology of igneous rocks, different igneous rocks formed in different periods have different lithology, strong lithology heterogeneity, extensive distribution and scattered, thick changes in thickness, insignificant response on seismic profiles and so on, resulting in difficulties in recognizing igneous rocks . Based on the data of multiple wells, the paper studies the lithology of igneous rocks using the cross-plot and logging curves, and summarizes the lithological characteristics of igneous rocks in this area and obtains a good understanding.