南堡凹陷断裂对油气成藏控制作用的定量评价

通过南堡凹陷断裂发育特征分析,考察油气分布与断裂之间的空间位置关系及断裂在油气成藏中的控制作用;利用模糊数学方法对断裂在油气成藏中控制作用进行综合定量研究,并对南堡2号东构造断层圈闭进行油气钻探风险性评价。结果表明:源断裂类型控制着对圈闭的供烃能力,断裂活动形成的背形构造是油气聚集的有利部位,断裂调节带控制着优质储层的发育,断裂对盖层的破坏程度控制着油气分布层位,断裂侧向封闭能力控制着断层圈闭油气富集程度;T4-51N和T4-21N为两个油气钻探风险最小的断层圈闭。

Quantitative evaluation for control of faults on hydrocarbon accumulation in Nanpu sag

Based on the analysis of faults characteristics of Nanpu sag, the relationship between hydrocarbon distribution and faults location and the control of faults on hydrocarbon accumulation were investigated. In addition, the control was comprehensively quantitatively studied by using fuzzy mathematics method and the fault traps drilling risk of No.2-east structure of Nanpu sag was evaluated. The results show that source faults types control the capacity of hydrocarbon injection into fault traps. Antiformal structure formed by the fault activity is a favorable site for hydrocarbon accumulation. Fault accommodation zone controls the development of high-quality reservoir. The extent of cap rock damaged by fault controls hydrocarbon distribution vertically. Fault lateral sealing ability controls the fault trap hydrocarbon accumulation extent. Two fault traps (T4-51N, T4-21N) in No.2-east structure of Nanpu sag have the minimal hydrocarbon drilling risk.