摘要
致密砂岩气资源量潜力巨大,已成为全球非常规天然气勘探的重点领域。根据成藏期储层物性控制成藏机理,可将致密砂岩气藏划分为先成藏后致密型、先致密后成藏型和复合型3种类型。致密深盆气藏具有近源运聚、持续充注、非达西渗流的特征,成藏动力主要是超压压差和源储压差,含气性受充注压力、储层物性、非均质性和渗透率级变系数的共同控制,特殊的"动力圈闭"成藏机制决定了其成藏过程的多阶段性及复杂的气水分布关系。致密砂岩气大规模富集成藏需要具备大面积高丰度的烃源岩、与源岩紧密接触的大面积非均质致密储层、区域性盖层及平缓的构造背景4个条件。
Tight sandstone gas has tremendous resource potential and it has become the focus in the area of global unconventional gas exploration. According to the accumulation mechanism controlled by physical property during accumulation process, tight sandstone gas reserw〉ir can be divided into three types： accumulation after the first compaction, compaction after the first accumulation and combination reservoir. Tight sandstone deep basin gas reservoir possesses the characteristics of source-proximal migration, continuous charging and non-darcy flow mechanism. The charging pressure mainly includes overpressure pressure differential and source- reservoir pressure differential. In addition, the gas saturation is commonly controlled by charging pressure, reservoir physical property, heterogeneity and permeability differential. The peculiar gas accumulation mechanism of ＂dynamic trap＂ leads to the intermittency of accumulation process and the variation of gas-water distribution. Its enrichment and accumulation require large area source rocks with high abundam：e ratios, tight heterogeneous reservoir contacting with source rocks closely, regional cap rocks and gentle structure background.
出处
《断块油气田》
CAS
2014年第1期1-6,共6页
Fault-Block Oil & Gas Field
基金
国家油气重大专项"前陆盆地油气成藏规律
关键技术及目标评价(二期)"(2011ZX05003)
中国石油大学(华东)自主创新科研计划项目"致密砂岩储层天然气充注机制研究"(13CX06017A)
中国石油勘探开发研究院项目"压差和渗透率级差控制下的致密砂岩气充注机制研究"(2011Y-004)
关键词
致密砂岩气藏
深盆气
充注运移
成藏特征
富集规律
tight sandstone gas reservoir
, deep basin gas
charging and migration
accumulation characteristics
pattern ofenrichment
