安徽阜阳地区沉积盆地演化与非常规油气藏的地质要素构成

Sedimentary basin evolution and geological elements of unconventional oil and gas reservoirs in Fuyang area,Anhui Province

安徽阜阳地区位于周口坳陷东部,古生代属于华北地台克拉通盆地,上古生界石炭—二叠系发育了一套三角洲聚煤沉积建造。由于频繁海进海退,砂岩、灰岩与泥岩、煤间互沉积,构成"源—储互层式"生储盖组合,易于形成含页岩气、煤层气、致密砂岩气在内的多烃类相态的非常规油气资源。通过对沉积盆地演化特征的研究,认为研究区所处盆地存在3种类型的演化模式:区域抬升型、持续沉降型和差异沉降型,反映了印支期之后研究区盆地各构造单元演化的差异性,这种差异性对沉积、构造、生烃史等有重要的控制作用。

Fuyang area is located in the eastern of Zhoukou Depression, which belongs to North Chi- na Platform Craton Basin in the Paleozoic, and a set of coal-bearing delta is deposited in the Upper Paleo- zoic. Due to frequent transgression and regression, and the ＂interbedded＂ sedimentary structure of sand- stone, limestone, shale and coal, the ＂source-reservoir interbedded type＂ assemblage is constituted in Fuyang area. Multi-hydrocarbon unconventional reservoirs including shale gas, coal bed methane and tight sandstone gas are easy to form here. Through the sedimentary basin evolution studies, three types of basin evolution models are identified, which reflects there is difference of the basin evolution after the Indosini- an. The three types are regional uplift model, continuous sedimentation model and differential sedimenta- tion model. The difference among them plays an important controlling role for the deposition, tectonic and hydrocarbon generation history.