方正断陷方3井区砂砾岩构造气藏描述

Description of Structure-Conglomerate Gas Reservoir in Fang3 Well Area of Fangzheng Rift

方3井区天然气藏是目前方正断陷第三系地层中发现的唯一气藏,该气藏特征的详细描述对指导方正断陷下一步油气勘探具有实际意义。因此,利用精细构造解释、波阻抗反演等方法落实了方3井区圈闭形貌,通过储层横向发育规模预测确定了气藏平面分布范围,根据录井、测井、试油和分析化验等资料建立了气、水层判别标准,指出了气藏气、水层的分布规律、储集特征及温度与压力变化规律。综合分析表明,方3井区气藏类型为层状构造气藏,储集层以砂砾岩为主,综合评价为中深层、低产、中丰度、小型气藏。

At present, the natural gas reservoir in Fang3 well area is a unique gas reservoir found in Tertiary bed of Fangzheng Rift, so that the detailed description of characteristic of gas reservoir is actually significant for guiding the exploration of oil and gas in Fangzheng Rift in future. Therefore, we ensure the shape of trap by the fine structural interpretation and wave impedance inversion, confirm the scope of gas reservoir distribution through predicting the scale of reservoir spreading, and establish the standard of identifying the gas and water bed with data of geological logging, well logging and testing in Fang3 well area. By them,we point out the laws of distribution of the gas and water bed, reservoir characteristic and the regulation of the temperature and pressure varying of the gas and water bed in gas reservoir. The integrated analysis indicates that the type of gas reservoir is layered structural gas reservoir, and the gravel stone is primary reservoir in Fang3 well area. It is a medium to deep layer, low yield, medium abundance, small scope gas'reservoir by synthetically evaluating.