根缘气“甜点”资源结构预测方法

根缘气具有广阔的勘探开发前景，“甜点”又是根缘气藏内具有工业勘探价值的具体目标，其资源结构很大程度上制约着根缘气藏的勘探和开发效益。目前针对根缘气“甜点” 资源结构预测方法的研究很少，文章依据根缘气“甜点” 特征，将其资源结构预测方法归纳为规模序列法、规模概率法和发现过程模型法等3类。应用上述方法的适用条件和实际资料状况，选择帕莱托分布模型对吐哈盆地小草湖洼陷的根缘气“甜点” 资源结构进行了预测。结果表明，小草湖洼陷根缘气（“甜点” ）勘探富有前景，西山窑组及三间房组的“甜点” 数量介于29~42之间，为最佳勘探层位。

Resource Construction Assessment Methods for Sweet Spots in Source-contacting Gas

Source-contacting gas (or basin-centered gas, deep basin gas) accumulations are of wide and bright prospects for exploration and production. However, the benefits for exploration are confined by the size construction of the sweet spots, which are the objects with industrial value within source-contacting gas accumulations. Nowadays, researches on assessment methods for resource construction of source-contacting gas are still rare. Based on the resource assessment methods for conventional resources, evaluation methods for sweet spots construction can be systematically concluded into three types as scale sequence, scale probability and discovery process analysis methods. According to the actual data and the applicable conditions for the above methods, Pareto model is selected to predict the sweet spots construction of source-contacting gas in Xiaocaohu sag,Turpan-Hami basin. The predicted result shows that 29~42 sweet spots with exploration value occur in Xishanyao and Sanjianfang formations and the exploration prospect of source-contacting gas is bright in this sag.