松辽盆地尚家油田油气输导体系及特征

Study on hydrocarbon migration pathway system of Shangjia Oilfield in Songliao Basin and its characteristics

分析尚家油田扶余杨大城子及葡萄花油层油气输导体系,发现油田主要存在断裂简单型输导体系及断裂与砂体组合复合型输导体系.空间构造形态控制油气的运移方式,正向构造脊线是三肇凹陷青山口组生成的油气向尚家地区侧向运移的主要通道和聚集场所;输导体系与油气成藏各种控制因素在时间上的合理匹配决定了尚家油田油气的聚集成藏.断层型输导体系输导能力的变化具有周期幕式特征,而断裂与砂体组合输导体系的输导能力主要受控于断裂与砂体的对接模式及砂体自身的输导能力.在尚家油田同向断层与砂体组合模式及反向断层与砂体组合模式中的连续型和错接型组合模式具备侧向的输导能力,而反向断层与砂体组合模式中的离散型不具有侧向输导能力.通过有效通道空间系数的计算及各油层组油显示层段的统计结果证实,尚家油田在扶余油层中扶一油层组砂体侧向输导能力强,杨大城子油层中杨一油层组砂体侧向输导能力强.

Through the analysis of hydrocarbon migration pathway system of F,Y oil layers and Putaohua layer in Shangjia Oilfield,it is found that there are two types of migration pathway systems,simple fault type and fault-sandbody compound type.By studying on effectiveness of migration pathway systems in Shangjia Oilfield,it is shown that the special morphology of structure controls the hydrocarbon migration direction of migration pathway systems,positive structure hinge line is the main passageway for hydrocarbon migrating laterally from Qingshankou formation in Sanzhao Depression to Shangjia area and accumulation places.Meanwhile,it is the rational matching of hydrocarbon migration pathway system with the various control factors of hydrocarbon accumulation in time and space that determines the hydrocarbon accumulation and reservoir formation of Shangjia Oilfield.The transporting capacity variation of the simple fault migration pathway systems is of periodic episodic characteristics,while the transporting capacity of the fault-sandbody compound migration pathway systems is controlled mainly by the connection modes of faults with sandbodies and the transporting capacity of the sandbodies themselves.The hydrocarbon migration pathway systems with the continuous joint mode and malposed joint mode between direction fault or antithetic fault and sandbody have lateral transporting capacity,while the hydrocarbon migration pathway systems with the discrete joint mode between antithetic fault and sandbody have no lateral transporting capacity.The calculation of effective pathway space factor and the statistics of oil show layers in each reservoir group show that Fu-1 reservoir sandbody of Fuyu oil reservoir and Yang-1 reservoir sandbody of Yangdachengzi oil reservoir all have good lateral hydrocarbon transporting capacity.