数理统计应用于示踪原油运移趋势的探索——以塔河油田奥陶系原油为例

摘要

利用数理统计的思想构建了一种综合分析原油运移趋势的方法,该方法能极大地简化数据处理和分析的过程.该方法将样品中用于示踪原油运移趋势的诸多运移指标综合表征为一个参数——运移指数(Im),Im可以用来判断各取样点距离烃源灶的相对远近;通过比较不同类别Im的标准差,定义了一个可信度参数(K),用于判断研究结果的可信程度.分别通过对塔河油田奥陶系的22个原油样品的极性化合物的66个浓度数据、13个成熟度参数比值和15个极性化合物异构体比值等3组数据的分析,得到3张Im等值线图;3组数据的K值比较后可知极性化合物浓度数据的统计分析更可信.其分析结果表明塔河油田奥陶系原油运移方向是从东向西,从南往北的.%A new method, based on the theory of mathematic statistics, is constructed to analyze the crude oil migration trends. A good deal of indices tracing crude oil migration trend are characterized as a parameter; migration index (Im). Contour maps by Im can figure the direction of oil migration. A reliability parameter (K) which is used to judge the credibility of the results is also defined in this method. Concentration data (66) of polar compounds, maturity parameters (13) and isomer ratios (15) of polar compounds of Ordovician crude oil samples (22) from the Tahe Oil Field were analyzed respectively. The results show that crude oil migration directions are from east to west and from south to north. Compared with the K values of the three groups of parameters , the Im of polar compound concentration can indicate the direction most accurately.