南堡1号构造馆三段断盖配置油气渗漏部位及其控藏作用

为了研究南堡凹陷南堡1号馆三段火山岩盖层上下油气分布规律，在馆三段火山岩盖层及其内油气渗漏断裂发育及分布特征研究的基础上，通过对馆三段火山岩盖层断接厚度与其封油气所需最小断接厚度相对大小的比较和对油气渗漏断裂凸面脊的确定，预测了南堡1号构造馆三段断盖配置油气渗漏部位；并结合油气分布，对断盖配置油气渗漏部位对油气成藏与分布的控制作用进行了研究。结果表明，南堡1号构造馆三段断盖配置发育10处油气渗漏部位，其中：F₂及分支断裂油气渗漏部位最发育，有3处油气渗漏部位；其次是F₁、F₆断裂，有2处油气渗漏部位；F₃、F₄、F₅和F₇断裂仅各发育1处油气渗漏部位。这些油气渗漏部位及附近有利于下伏东一段油气在上覆馆三段之上聚集成藏，应是造成南堡1-1断鼻、南堡1-3断块和南堡1-5断鼻北部油区油气既可以分布在下伏东一段又可分布在馆三段之上，而南堡1-5断鼻南部油气仅分布在下伏东一段的根本原因。

Oil and Gas Leakage Positions of Fault Cap Rock Configuration and Its Control on Hydrocarbon Accumulation of Ng3 in Nanpu 1 Structure Area

To uncover the oil and gas distribution law of the Ng₃ of Nanpu 1 structure in the Nanpu sag, the development and distribution characteristics of the volcanic rock cover and its internal oil gas leakage faults in the third section of Nanpu 1 structure were studied. Through the comparison of the breaking thickness of the third volcano cap rock of Ng₃ and the minimum breaking thickness required for sealing of seal oil and gas,and the convex ridge of the oil and gas leakage fault, the oil-gas leakage positions in the Ng₃ of Nanpu 1 structure were predicted, and also its control effects on hydrocarbon accumulation were determined with the combination of oil and gas distribution. The results show that 10 oil and gas leakage positions are developed in the third section of the Nanpu 1 structure area;among them, three leakage sites are developed on the F₂ and its branch fractures,two oil and gas leakage sites are developed on the F₁ and F₆ for each,and one oil and gas leakage sites are developed on the F₃, F₄, F₅ and F₇ faults respectively. These oil and gas leakage position and its nearby area are favorable for hydrocarbon accumulation in the lower first East segment toward the upper overlying third segment in Nanpu 1 structure, which should be the reason of the oil and gas accumulation both under the lower first East segment and above the overlying third segment at Nanpu 1-1 broken nose, Nanpu 1-3 block and Nanpu 1-5 fault nose in Nanpu 1 structure area.