松辽盆地南部低阻油层分布规律及勘探潜力

20世纪90年代后期以来,吉林油田开展了低阻油层成因机理分析及其测井解释方法的技术攻关,经勘探实践发现,松辽盆地南部较普遍发育有低阻油气层。据29个油气田统计,具有低阻油层特征的探明石油地质储量近1.7×108t,约占目前吉林油田总储量的20%左右。在总结大量成果的基础上,介绍了岩石物理成因研究与低幅度—低阻油藏的分布规律,认为在生油坳陷及其区域构造背景条件下,老油田主力油藏之上的披覆圈闭与之下层位的低幅度构造、油气运移路径上的低幅度圈闭及局部高矿化度地层水的地区发育有规模的低阻油藏。同时,分析了松辽盆地南部低阻油层勘探潜力,并提出红岗阶地、扶新隆起及其华字井阶地仍是低阻油层有利勘探领域。

Distribution Law and Exploration Potential of Low-resistivity Reservoirs in the South of Songliao Basin

Jilin Oilfield has launched the technical brainstorms of the mechanism analysis and well logging interpretation for the low-resisivity reservoir formation since late 1990s. Through practical exploration, low-resistivity oil and gas reservoirs are found to berelatively abundant in the southern Songliao Basin. According to the statistics of 29 oil-gas fields, there are 170 million tons of provenoil reserves with low-resistivity property, taking up about 20 percent of the total reserves of Jilin Oilfield at present. The research onphysical cause of rocks formation and the distribution law of low- amplitude and low-resistivity reservoirs are introduced. It is concludedthat under the conditions of oil-generating depression and regional structure background, low-resistivity reservoirs can be discovered inthe drape traps over the main reservoirs of old oilfields, the structure traps of low-amplitude under main reservoirs, the low- amplitudetraps over the path of oil and gas migration, the regions of local highly mineralized formation water. Moreover, the analysis on theexploration potential of low-resistivity reservoir in the south of Songliao Basin is carried out. It is pointed out that Honggang terrace,Fuxin uplift and its Huazijing terrace are still favorable for low-resistivity reservoir exploration.