鸡西盆地与川西坳陷致密砂岩气成藏条件类比研究

在系统的介绍了“原生型”深盆气和“构造型”致密砂岩气两种致密砂岩气藏的基础上,对鸡西盆地源岩生排烃时期与储层致密化时期做出预测,并首次对鸡西盆地致密砂岩气藏类型做出判断,认为鸡西盆地致密砂岩气属“改造型”致密砂岩气。进而选择代表该类气藏的川西坳陷致密砂岩气藏与鸡西盆地的成藏条件进行类比。结果认为：二者气源条件都较为优越,能够大量生烃;而且储层都较致密。但鸡西盆地由于构造活动强烈,断裂大量发育,对气藏破坏作用大,保存条件要明显差于川西坳陷。因此,鸡西盆地难以形成类似川西坳陷的大型致密砂岩气藏,但在成藏条件优越的局部地区可形成具有经济价值的中小型的致密砂岩气藏。最后,通过排气强度、孔隙度、断层发育等主控因素的叠合对鸡西盆地致密砂岩气藏分布的有利区进行预测。

Analogue research on the conditions of tight sandstone gas reservoir of Jixi biain and West Sichuan basin depression

Basically introducing the system of "native"deep basin gas and the "construction type " tight sand gas tight sandstone gas reservoirs, predict the periods of source rocks of hydrocarbon generation and reservoir compaction in Jixi Basin .And the first time on the type of tight gas sand Jixi basin done to determine. It is concluded that, the source rock condition of tight sandstone gas are both superior, it can generate a large number of hydrocarbon. Both of the reservoir are tight. However, its preservation conditions are poor,it has a large number of developing faults, its tectonic activity is intense,these damage the gas reservoir.Therefore, Jixi basin is difficult to form large areas of deep basin gas, but, in the local economic value of small and medium tight sandstone gas reservoirs can be formed. Finally,by the exhaust strength, porosity, faults and other controlling factors superimposed to predict favorable areas on the distribution of tight sandstone gas reservoirs in Jixi basin.