肇州—朝阳沟扶余油层控制因素分析与有利区预测

Analysis on Controlling Factors of Fuyu Oil Layer and Prediction of Favorable Zone in Zhaozhou-Chaoyanggou Area

近年来,松辽盆地大面积低丰度分布的扶余油层已成为增储重点层系。扶余油层储层条件差,非均质性强,成藏控制因素复杂,高丰度有利区难以确定,严重制约了规模效益勘探的开展。针对肇州—朝阳沟地区扶余油层,在研究成藏地质条件基础上,运用基于多因素集成法的空间分布预测技术,识别出储层、运移结果和有利构造等油气成藏控制因素,通过建立的有效判别模版,预测了研究区勘探成功概率。在此基础上,利用丰度模拟技术研究了富油气区的分布。结果显示:勘探风险低值区主要分布在朝阳沟油田的翻身屯背斜、薄荷台鼻状构造、肇源南地区、肇州油田以及肇州油田南部州39—州391区域;除已发现油田部分,剩余油气资源主要富集于肇州油田南部州39—州391区、薄荷台鼻状构造以西和肇源南地区,剩余资源丰富,可达8000×104t,仍有较大勘探潜力。

In recent years,the widely distributed Fuyu Oil Layer of low abundance has become a focus for increasing reserves in Songliao Basin.However,some features of the layer have seriously block the exploration progress,such as the poor reservoir conditions,the heterogeneity,the complex controlling factors and the difficulty to determine favorable areas of high abundance.By a detailed study on the reservoir geological conditions and the forecasting techniques of petroleum spatial distribution based on the integrated method of multiple factors,the controlling factors of the accumulation are confirmed,an effective discriminant analysis template is established,and the probability of exploration success in Zhaozhou-Chaoyanggou Area is predicted.Furthermore,the distribution of the oil and gas-rich region is studied by fractal simulation of petroleum abundance.The results reveal that the low-risk exploration area is mainly distributed in the Fanshentun Anticline,the Bohetai Nose Structure,the south of Zhaoyuan,the Zhaozhou Oilfield,and Zhou39-Zhou391 area in south of Zhaozhou Oilfield.Besides the discovered resources,the remaining resources are approximately 80 million tons and mainly enriched in the southern area of Zhaozhou Oilfield,the west of Bohetai Nose Structure and southern Zhaoyuan.