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相和势对油气藏形成与分布有着重要的控制作用,利用相势复合定位可以对有利勘探目标区进行预测.以塔里木盆地塔中北部地区为例,应用相势复合原理对有利目标区进行了预测.结果表明:塔中北部地区油气的分布宏观上受构造相带和沉积体系展布的控制,微观上砂体的含油气性受岩相和岩石物理相的控制,相控油气作用表现出相对高孔渗的控藏地质模式;塔中地区油气的分布还受界面势能(碳酸盐岩)和位能(碎屑岩)的控制,上构造层油气主要分布在相对低位能处;下构造层油气主要分布在相对低界面势能处.油气的分布受相、势联合控制,优相低势区为油气聚集的有利区带.通过用相势复合理论对塔中油气藏有利目标区进行预测后发现,目前已发现的油气藏落入预测有目标区的概率在90%以上,其预测结果对油气勘探有指导意义.
The phase and potential have an important control over the formation and distribution of oil and gas reservoirs, and the potential exploration target areas can be predicted by using the potential complex locating. Taking the northern part of the Tazhong area in Tarim Basin as an example, the potential target areas The results show that the distribution of oil and gas in the northern part of Tazhong is controlled macroscopically by the distribution of tectonic facies belt and depositional system. The microscopic oil-bearing of sand body is controlled by lithofacies and petrophysical facies, Relatively high porosity and permeability; the distribution of oil and gas in Tazhong area is also controlled by the interface potential energy (carbonate rock) and potential energy (clastic rock), and the hydrocarbons in the upper structural layer are mainly distributed at relatively low potential energy; The hydrocarbon in the tectonic layer mainly distributes at the relatively low interfacial potential.The distribution of oil and gas is controlled by the combination of phase and potential, and the favorable phase zone is the favorable zone for oil and gas accumulation.By using the complex potential theory, After the prediction, it is found that the probability of the currently discovered oil and gas reservoirs falling into the predicted target area is more than 90%, and the prediction result has instructive significance for oil and gas exploration.