玛湖凹陷西斜坡致密油藏有效储层物性下限确定

发布时间：2018-08-21 12:13

【摘要】：致密油是非常规油气资源的重要组成部分,资源潜力巨大,是今后较为现实的油气资源接替领域之一。中国致密油藏勘探开发起步较晚,总体研究程度较低,特别是对致密油藏有效储层物性下限的研究相对薄弱。通过分析致密油成藏动力学机制,以生油增压作为油气充注的主要动力,毛细管压力为主要阻力,确定油气充注的临界条件;即生油增压等于毛细管力,建立判别致密油藏有效储层物性下限的方法。应用所建立的有效储层物性下限的判别方法计算出玛湖凹陷西斜坡风城组组致密储层在埋深为2 500~3 000 m、3 000~3 500 m、3 500~4 000 m和4 000~4 500 m时有效储层的临界孔喉半径分别为0.287μm、0.230μm、0.187μm和0.147μm;所对应的临界孔隙度分别为5.70%、4.33%、3.53%和1.95%;所对应的临界渗透率分别为0.148 m D、0.083 m D、0.059 m D和0.030 m D,有效储层物性下限随埋藏深度的增加逐渐减小。
[Abstract]:Compact oil is an important part of unconventional oil and gas resources. The exploration and development of dense reservoirs in China started late, and the overall research level was low, especially for the lower limit of effective reservoir properties in dense reservoirs. By analyzing the kinetic mechanism of tight oil reservoir formation, the critical conditions for oil and gas filling are determined by taking oil source pressurization as the main driving force and capillary pressure as the main resistance, that is, the oil source pressurization is equal to the capillary force. The method of determining the lower limit of effective reservoir property in dense reservoir is established. Using the established lower limit of effective reservoir physical properties, the critical pore throat radius of the effective reservoir was calculated when the buried depth of Fengcheng formation on the west slope of Mahu depression was 2 500 ~ 3 000 m ~ 3 000 m ~ 3 500 m and 4 000 m ~ 4 500 m, respectively. It is 0.287 渭 m 0.230 渭 m 0.187 渭 m and 0.147 渭 m, the corresponding critical porosity is 5.70 and 4.333.53% and 1.95mm respectively, the corresponding critical permeability is 0.148 m DX 0.083 m D 0.059 mm D and 0.030 mm D, and the lower limit of effective reservoir physical properties decreases gradually with the increase of burial depth.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)中国油气资源与探测国家重点实验室;国土资源部油气资源战略研究中心;
【分类号】：P618.13

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