多因素评价地层富水性技术的分析与应用

Analysis and application of formation water-rich evaluation technology by using multiple factors

近年来,融合多因素评价砂泥质沉积建造富水性技术日趋成熟,但在应用中经常出现数据采信不规范导致评价效果不理想、盲目追求数据多样化导致“技术”过于复杂影响普适性的问题。为此,提出目标层段概念,富水性评价的实质是目标层段内地层的富水规律评价,在目标层段约束下可以排除大量的无效数据;从实践角度分析常用的地学参数数据现实来源及其可靠性,得出多种参数同时具备的案例极少、可采信的数据量不大的结论。在地学参数种类少、数据量小的现实条件下,可以利用常规的办公手段实现信息融合以规避复杂的数学工具和较难掌握的软件应用。通过完整的案例说明富水性评价过程中数据筛选、权重确定、归一化处理、数据融合、成果图绘制的方法,技术难度低、容易被基层工程技术人员掌握。工程实践表明,虽然采用的地学参数少、数据量较小,由于与采矿工程结合密切,评价效果较好。

In recent years,the technique of integrating multiple factors to evaluate the water-richness of sand-mud deposits is becoming more and more mature,but in the application,the result of evaluation is not ideal because of the non-standard data acceptance,and the"technology"is too complex to affect the universality.Therefore,the concept of target interval was put forward.The essence of water abundance evaluation is the evaluation of water abundance law in the target interval,which can exclude a large number of invalid data under the constraint of the target interval;from the practical point of view,this paper analyzed the practical sources and reliability of commonly used geoscience parameter data,and drew the conclusion that there are few cases with multi-parameters and little data can be accepted at the same time.Under the realistic conditions of few kinds of geological parameters and small amount of data,information fusion can be realized by conventional means to avoid complicated mathematical tools and software applications which are difficult to master.The method of data screening,weight determination,normalization,data fusion and result drawing in the process of water-rich evaluation was explained by a complete case.The engineering practice showed that the evaluation effect is good because of the close combination with mining engineering,although the geoscience parameters are few and the data quantity is small.