塔北隆起区一间房组礁滩沉积体特征

塔北隆起区中奥陶统一间房组礁滩沉积体是目前塔河油田油气勘探向南扩展的重要目标,但由于礁滩沉积体通常隐伏于台地相大套石灰岩地层中,长期以来难以通过地震资料及已有的认识进行预测。文章利用钻井及三维地震资料,通过礁滩层地震标定,一间房组及其上下地层的地震相及沉积相分析,建立了坡折带、礁滩沉积体发育带的地震识别标志,阐明了古隆起与坡折带及礁滩沉积体的关系,并建立了相关地质模式。结果表明,对应于中奥陶世塔北古隆起的构造转折带发育的一间房组台内坡折带控制了礁滩沉积体的发育分布,位于该坡折带以北环绕古隆起呈带状分布的8个礁滩沉积体发育区块,将是下一步油气勘探的优选目标。

四川盆地晚二叠世长兴期古海洋台洼与陆棚边缘礁滩对比研究

以长兴组台地边缘礁滩储层发育认知为指导,将三维与二维地震资料相结合,开展台洼边缘礁滩与台地边缘礁滩的沉积背景、发育模式、古地貌的综合对比研究,对四川盆地中部蓬溪-武胜台洼边缘礁滩发育演化特征进行分析,提出了四川盆地东南部泰来、永兴场及义和地区3种台洼边缘礁滩发育模式。受开江-梁平陆棚、峨眉地裂运动以及微古地貌影响,泰来地区以台洼边缘礁滩沉积为主,永兴场地区沉积低能生屑滩,义和地区发育成排生物礁带及点礁。从长兴期整个四川盆地沉积格局分析,蓬溪-武胜台洼边缘礁滩与开江-梁平陆棚边缘礁滩整体沉积格局相似,但台洼边缘生物礁滩纵向发育规模偏小,横向分布面积广泛。

超深层复杂碳酸盐岩滩相储层发育特征——以YB地区长兴组为例

YB地区长兴组为超深层高含硫生物礁气藏,属于台地边缘礁滩沉积,礁滩多期叠置,气水关系复杂。通过岩心、测井和地震等资料开展滩体发育期次、沉积特征及储层发育特征研究,结果表明,长兴组纵向上发育三期生屑滩,分属三种不同的成因类型:浅缓坡高能滩、礁后低能滩和开阔台地低能滩;浅缓坡高能滩是储层发育的有利相带,滩相储层有利区主要分布于Y12井和Y5井区;综合评价滩区高含水,不具备开发潜力,但滩体产水对礁相生产井影响很大,滩体发育的礁相气井随着生产时间延长有一定产水风险。

Automatic discrimination of sedimentary facies and lithologies in reef-bank reservoirs using borehole image logs

Reef-bank reservoirs are an important target for petroleum exploration in marine carbonates and also an essential supplemental area for oil and gas production in China. Due to the diversity of reservoirs and the extreme heterogeneity of reef-banks, it is very difficult to discriminate the sedimentary facies and lithologies in reef-bank reservoirs using conventional well logs. The borehole image log provides clear identification of sedimentary structures and textures and is an ideal tool for discriminating sedimentary facies and lithologies. After examining a large number of borehole images and cores, we propose nine typical patterns for borehole image interpretation and a method that uses these patterns to discriminate sedimentary facies and lithologies in reeI^bank reservoirs automatically. We also develop software with user-friendly interface. The results of applications in reef-bank reservoirs in the middle Tarim Basin and northeast Sichuan have proved that the proposed method and the corresponding software are quite effective.

江油二郎庙长兴-飞仙关组沉积特征及其对元坝勘探的启示

元坝地区西侧的江油二郎庙剖面存在长兴-飞仙关组的礁滩相沉积组合，长兴组化石丰富，飞仙关组溶孔白云岩储层为高孔高渗优质储层，同时在储层中发现良好的油气显示；综合分析后认为，江油-元坝地区长兴-飞仙关组处于台地边缘，非常有利于高能鲡粒滩相沉积及优质储层发育，并具有良好的成藏条件。