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针对塔东地区天然气勘探面临的是否具有大量晚期原油裂解气气源供给和气藏封盖条件优劣的两个成藏关键问题,采用原油裂解气生成动力学方法和盖层微观参数评价方法对该区气藏形成条件进行评价研究.原油裂解气生成动力学研究和储层沥青统计结果表明塔东地区原油裂解气生成层位在寒武系顶部至奥陶系底部之间,原油裂解气至少有两种生成地质模式,即满东1井原油裂解气早期快速生成(中奥陶世-志留纪末)、大量裂解(天然气转化率>90%)模式和英南2井原油裂解气两阶段生成模式,英南2井晚期阶段原油裂解成气对塔东地区天然气勘探评价意义重大.盖层评价结果表明下部组合寒武-奥陶系泥岩或灰岩盖层微观参数明显好于上部组合,封闭能力强,相对于上部组合来说,盖层突破压力较大,压力封闭效果较好,天然气散失主要以扩散散失为主.根据上述研究结果,通过综合分析认为塔东地区环满加尔坳陷的孔雀河斜坡、塔东低凸起和英吉苏凹陷下部组合寒武-奥陶系天然气勘探前景广阔.
Aiming at the key problems of gas accumulation in Tarong area, whether there is a large amount of late gas cracking source gas supply or gas reservoir sealing conditions, the kinetic method of crude oil cracking gas formation and the evaluation method of microcosmic parameters Regional gas reservoir formation conditions were evaluated.Studies on the formation kinetics of crude oil cracked gas and the statistics of reservoir bitumen showed that the formation of crude oil cracked gas in the Tarong region is between the top of the Cambrian and the bottom of the Ordovician.The crude pyrolysis gas has at least Two kinds of geologic models were generated, that is, the early rapid formation of crude oil pyrolysis gas from Mandong 1 well (Middle Ordovician-Silurian end), the massive pyrolysis (natural gas conversion rate> 90%) and the oil cracking of Yingnan 2 well Model, the oil cracking into gas in the late stage of Well Yingnan 2 is of great significance to the natural gas exploration in Tarong area.The results of caprock evaluation show that the microscopic parameters of the lower Cambrian-Ordovician mudstone or limestone cap rock are obviously better than the upper combination, Strong ability, relative to the upper part of the combination of the cover breakthrough pressure, pressure closure better, natural gas loss mainly spread to loss.Based on the above results, Through comprehensive analysis Towers East Central Manjiaer Depression Peacock slopes, low in the east tower and raised the lower Yingjisu depression combined Cambrian - Ordovician gas exploration prospects.