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石炭系 (仅存黄龙组 )是川东、川东北乃至鄂西地区碳酸盐岩地层中最重要的一套储集层 ,但分布并不稳定 ,有些地区呈零星状分布甚至完全缺失。通南巴构造周边露头区二叠系直接与志留系不整合接触 ,未发现石炭系。但在地震剖面上 ,Tp1(二叠系底界 )反射之下、志留系弱反射之上有呈断续状分布的反射 ,并与零星分布的波阻抗大于 2 30× 10 5kg/m2 ·s高阻抗区域相对应。这些特征说明通南巴构造腹部存在石炭系。
The Carboniferous (the only remaining Huanglong Formation) is the most important reservoir in the carbonate rocks in east Sichuan, northeastern Sichuan and even western Hubei Province, but the distribution is not stable. Some areas are sporadic or even completely missing. Permian in the outcrop area around Tongnanba tectonic area directly contacted with Silurian unconformity, and no Carboniferous was found. However, under the reflection of Tp1 (Permian’s bottom boundary), the reflection above the weak reflection of the Silurian on the seismic section shows a discontinuous distribution with a wave impedance of more than 2 30 × 10 5 kg / m 2 · s high-impedance area. These characteristics indicate that there is a Carboniferous in the abdomen of Tongnanba.