基于氧化系数的火山喷发环境判别:以准噶尔盆地西北缘下二叠统为例

发布时间：2019-06-30 23:19

【摘要】：火山喷发环境的准确判别是火山岩储层评价的重要依据,准噶尔盆地西北缘下二叠统火山岩类型多,沿盆地边缘断裂带分布,是这一地区重要的油气储层类型。文章通过岩芯分析、薄片观察、地球化学元素分析等手段,对该区火山岩的喷发环境展开研究。基于75个火山岩样品数据,对火山岩的氧化系数进行分析,并充分考虑了喷发环境、岩浆性质、风化及埋藏作用等因素对氧化系数的影响,改进了传统的基于氧化系数的火山喷发环境判别图。实际应用结果与其他判别依据得到的结果进行对比,符合率达到92.86%,仅两例不符。这一判识图可供其他相似地质背景地区参考使用,所获认识为研究区火山岩储层评价提供了新思路。
[Abstract]:The accurate discrimination of volcanic eruption environment is an important basis for volcanic reservoir evaluation. There are many types of Lower Permian volcanic rocks in the northwest margin of Junggar Basin, and they are distributed along the marginal fault zone of the basin, which is an important type of oil and gas reservoirs in this area. In this paper, the eruption environment of volcanic rocks in this area is studied by means of core analysis, thin slice observation and geochemical element analysis. Based on the data of 75 volcanic rock samples, the oxidation coefficient of volcanic rocks is analyzed, and the effects of eruption environment, magmatic properties, weathering and burial on the oxidation coefficient are fully considered, and the traditional discriminant map of volcanic eruption environment based on oxidation coefficient is improved. The practical application results are compared with those obtained by other discriminant bases, and the coincidence rate is 92.86%, and only two cases are not consistent with each other. This identification map can be used for reference in other similar geological background areas, and the recognition provides a new idea for volcanic reservoir evaluation in the study area.
【作者单位】：中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室中国石油大学(北京);
【基金】：国家自然科学基金(41172104;41372117;41272133) 国家油气重大专项(2011ZX05009-002;2011ZX05014-001) 中国石油大学(北京)科研基金资助(KYJJ2012-01-06)联合资助
【分类号】：P618.13

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