利用原油荧光光谱参数定量评价塔河地区奥陶系不同期次充注油气成熟度
左高昆 , 曹自成 , 刘永立 , 郭小文 , 王斌 , 陈家旭 , 徐豪 , 张旭友
地球科学 ›› 2024, Vol. 49 ›› Issue (07) : 2434 -2447.
利用原油荧光光谱参数定量评价塔河地区奥陶系不同期次充注油气成熟度
Quantitative Evaluation of Petroleum Maturity of Different Periods of Charging of Ordovician Reservoirs in Tahe Area Using Fluorescence Spectrum Parameters of Oil
,
塔河地区储层原油主要来自于寒武系玉尔吐斯组烃源岩,所发现的油藏为不同期次,不同成熟度的原油在储层中发生混合的结果.在对储层原油成熟度和荧光光谱分析的基础之上,利用荧光光谱参数建立原油成熟度定量评价模板,通过获取的油包裹体荧光光谱参数对塔河地区不同期次充注原油的成熟度进行定量评价.原油成熟度参数分析结果表明芳烃中甲基菲指数和二苯并噻吩参数是定量评价塔河地区原油成熟度的有效指标.采用芳烃成熟度参数计算得到塔河地区原油成熟度(R o)范围为0.6%~1.4%,与原油荧光光谱参数具有很好的相关性,基于原油荧光光谱参数与成熟度的关系建立了原油成熟度定量评价模板.流体包裹体分析结果表明塔河地区奥陶系碳酸盐岩储层中存在四期油气充注,分别对应发橘黄色、亮黄色、浅黄色和蓝色荧光的油包裹体,不同期次油包裹体荧光光谱参数存在一定差异.通过不同期次油包裹体荧光光谱参数结合建立的原油荧光光谱参数成熟度评价模板确定橘黄色荧光油包裹体油成熟度(R o)小于0.6%,亮黄色荧光油包裹体油(R o)在0.6%~0.8%之间,浅黄色荧光油包裹体油(R o)在0.8%~1.0%之间,蓝色荧光油包裹体油(R o)在1.0%~1.2%之间.确定的不同期次充注油气的成熟度对于研究塔河地区油气成藏过程具有重要的参考作用.
多期成藏 / 成熟度 / 荧光光谱 / 油包裹体 / 塔河油田 / 石油地质.
multi-period hydrocarbon accumulation / oil maturity / fluorescence spectrum / oil inclusion / Tahe Oilfield / petroleum geology
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国家自然科学基金项目(U20B6001;41872139)
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