轮古7井以东地区前石炭纪古地貌恢复及识别

轮南古潜山在经历了中奥陶世至早石炭世沉积间断后,于中石炭世又再度接受沉积。依据地震构造解释,区域构造背景分析,研究了轮古7井以东地区奥陶系可溶蚀地层及可溶蚀区域分布范围,依据印模法和残厚法,通过对研究区古风化壳上下地层对应关系的分析,以石炭系区域标志层——双峰灰岩底至奥陶系潜山面填平补齐沉积厚度,运用印模法和残厚法,恢复该区前石炭纪古岩溶地貌,从而进行古地貌识别。划分了岩溶高地、岩溶缓坡地和岩溶峰丛谷地等地貌单元,为下一步的储层预测工作提供目标备选区域。

The Rehabilitation and Identification of Ancient Topography in Pre-Carboniferous to the East of the 7th Well in Lungu

After the break of sedimentation from middle Ordovician to early Carboniferous,Mount Lunnanguqian received deposition again in the middle of Carboniferous.According to the seismic structural explanation and analysis of regional structural background,the research is carried out upon Carboniferous soluble stratum and the distribution of soluble regions to the east of the seven wells in Lungu.In light of impression method and residual thickness method,and through the analysis of the corresponding relations between the upper and lower strata of the ancient weathering crust in the research area,the gap between the bottom of Shuangfeng limestone,the symbol stratum in limestone regions,and Carboniferous Qianshan stratum is filled,and rehabilitation of Pre-Carboniferous paleokarst topography in this region is made by applying impression method and residual thickness method which prepares for the identification of ancient topography.Topographical units such as karst highlands,karst slopes and karst peak cluster valleys are distinguished as alternative objective regions for further reservoir prediction work.