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针对静态储层评价方法不能很好地解释和预测低渗及致密砂岩的含油气性、动态储层评价方案无法对储层含油程度进行科学预测的情况,本文以鄂尔多斯盆地镇泾—西峰地区长6-长8段低渗及致密砂岩储层为对象,采用减孔过程和增孔效应相互叠加的方法恢复成藏期古孔隙度,并分析试油资料中的关键参数与储层孔隙度之间的各种关系,提出利用成藏期孔隙度(Φ成藏期)与临界孔隙度(Φ临界)的差值评价储层含油程度的新方法.研究结果表明:成藏期的储层临界孔隙度可作为评价储层有效性的关键指标,而储层物性与临界充注动力之间的耦合关系可用来判别有效储层的含油气性,在此基础上依据砂岩孔隙度与含油程度的关系可确立储层含油等级.用该方法可将该区砂岩储层划分为低含油差储层(Ⅲ类)、中等含油储层(Ⅱ类)、高含油好储层(Ⅰ类)3类,Φ_(成藏期)与Φ_(临界)的差值依次为:<3%,3%~6%和>6%;试油产油率分别为:0~20%,20%~70%和70%~100%.该评价方法的科学性、有效性在安塞地区得到验证,比以往评价方法更适合于评价低渗及致密砂岩储层的含油程度.
In view of the fact that the method of static reservoir evaluation can not well explain and predict the hydrocarbon-bearing property of low permeability and tight sandstone, and the dynamic reservoir evaluation scheme can not predict the oil content of reservoirs scientifically, 6-Chang 8 section of low-permeability and tight sandstone reservoirs, the ancient porosities in reservoir-forming period were restored by the combination of pore-reducing process and pore-increasing effect, and the key parameters in oil testing data and reservoir porosity A new method for evaluating the oil content of reservoirs by using the difference between the porosity (Φ reservoir period) and the critical porosity (Φ critical) during the reservoir formation period is proposed.The results show that the reservoir critical stage Porosity can be used as a key index to evaluate the validity of reservoirs. The coupling relationship between reservoir physical properties and critical charge dynamics can be used to determine the hydrocarbon-bearing properties of effective reservoirs. Based on the porosity and oil content of sandstone This relationship can be used to establish the oil level of the reservoir, and the sandstone reservoir in this area can be divided into three types: low oil reservoirs (Ⅲ), medium oil reservoirs (Ⅱ) and high oil reservoirs (Ⅰ) , Φ_ (accumulation period) and Φ_ (critical ) Were: <3%, 3% ~ 6% and> 6%, respectively; the oil yield of test oil was 0 ~ 20%, 20% ~ 70% and 70% ~ 100% Science and validity are validated in Ansai region, which is more suitable than previous evaluation methods to evaluate the oil content of low permeability and tight sandstone reservoirs.