南堡1号断层上升盘和下降盘油气富集特征差异及主控因素

Differences of Accumulation Characteristics and Main Controlling Factors Between Rising and Falling Walls of Nanpu No.1 Fault

为明确南堡1号断层上升盘和下降盘油气差异富集的主控因素,总结断层两盘油气富集特征,对比断层两盘输导、保存、圈闭等条件的差异,进而分析主控因素,总结油气成藏模式。研究结果表明:南堡1号断层上升盘由与烃源岩直接相连的Ⅰ级输导断层供烃,断层输导能力更强,是南堡1号断层两盘油气富集规模差异的主控因素;上升盘断层残余厚度更大,保存条件更优,是南堡1号断层两盘油气富集层位差异的主控因素;圈闭面积大小及不同级次输导断层组合关系是南堡1号断层两盘油气富集位置差异的主控因素。总结出断层上升盘和下降盘两种不同的成藏模式,研究成果可为类似区块滚动勘探提供借鉴。

In order to make clear about the main factors controlling different enrichment of oil and gas in rising and falling walls of Nanpu No.1 Fault,this paper summarizes the different enrichment characteristics of oil and gas in the scale,and compares the differences of transmission conditions,preservation conditions and trap conditions between the two walls of fault.The main controlling factors are analyzed,and two different oil and gas accumulation modes of the upper and lower walls of the fault are summarized.According to the study,the rising wall of Nanpu No.1 Fault is supplied by grade I transport fault directly connected with source rocks.The difference of transport capacity of different grade transport faults is the first main controlling factor for the difference of oil and gas enrichment between the two sides of fault.The second main controlling factor is related to the residual thickness of the rising wall fault which is larger than that of the falling wall,and the preservation conditions are better.The third main controlling factor is the size of trap area and the combination of different levels of transport faults.The rising and falling walls of the fault can be summarized into two different reservoir forming modes.The research results can provide reference for rolling exploration in similar blocks.