摘要
应用多种方法确定了杜桥白地区深层天然气的来源 ,研究表明白庙地区天然气主要来源于前梨园洼陷第三系烃源岩和石炭—二叠系煤系地层 ,靠近兰聊断裂带构造高点 ,浅层 Es下2 — Es23气层具有较高的4 0 Ar/ 36 Ar比值 ,为煤型气及混合气 ,而远离兰聊断裂带 ,且处于构造低部位的 Es1 3— Es4 3气层具有较低的 4 0 Ar/ 36 Ar比值 ,为油型气 ;桥口构造 Es33、Es4 3段气层主要为油型气 ;杜寨地区 Es33段气层为油型气 ,来自于 Es33段气源岩。天然气氦同位素分析表明杜寨、桥口地区深层天然气为壳源气 ,白庙地区气藏主要为煤型油型复合气藏 ,并有幔源气的混入。
On the basis of many methods, the main origin of deep layer natural gases in Duqiaobai area, Dongpu depression has been identified. The natural gases in Baimiao area mainly stemmed from the Tertiary Hydrocarbon source rock and Permo-Carboniferous coal-bearing strata in Qianliyuan depression. Shallow Es下 2—Es2 3 gas layer in structural high near to Lanliao fault zone possesses much high ratio 40 Ar/ 36Ar,which is coal formed gas and mixed gas .However, Es1 3—Es4 3 gas layer in structural low far from Lanliao fault zone has low ratio 40 Ar/ 36Ar,which is petroligenic natural gas. Es3 3—Es4 3 gas layer is mainly petroligenic natural gas in Qiaokou area.Es3 3 gas layer in Duzhai area is petroligenic natural gas,which originated from the gas Es3 3 source rock .And analysis on helium isotope of natural gas show that the deep-layer natural gases in Duzhai area and Qiaokou area is crust-derived gas and that it is mainly mixed gas of coal formed gas and petroligenic natural gas, with small portion of mantle-derived gas.
出处
《沉积学报》
CAS
CSCD
北大核心
2003年第2期350-354,359,共6页
Acta Sedimentologica Sinica
