伦坡拉盆地下第三系储集层成岩作用和孔隙演化

藏北伦坡拉盆地下第三系储集层主要发育于始新统牛堡组二段至渐新统丁青湖一段，储集层所经历的成岩作用十分复杂，现象十分丰富。详尽描述了压实、４期溶蚀、３期胶结、交代、破裂等成岩作用的过程及特征，确认区内储集层所经历的主要成岩环境为：湖底／河流→大陆地表→埋藏→大陆地表。孔隙演化研究表明，区内储集层的原始孔隙度均较高，经过一系列成岩作用后，原生孔隙所剩无几；溶蚀作用特别是深埋溶蚀作用形成的各类溶孔，是进油期的主要孔隙，孔隙度一般为５％～１５％，部分充填烃类。照片１０图５参４（邹冬平摘）

The diagenesis and porosity evolution of the Lower Tertiary system in Lunpola basin, Tibet.

The reservoir in the Lower Tertiary system was mainly developed in the second Member of Niubao Formation to the first Member of Dingqinghu Formation in which the diagenesis suffered is very complex. The diagenetic phenomenon is very common, main diagenesis includes: compaction, solution, cementation, cracking, etc.. The porosity evolution study suggests that the initial porosity of reservoir in the area is higher. After reservoir was subjected to a series of diagenesis, primary porosity of reservoir is less; whereas all solution pores formed by solution, specially solution in deep burial environment are the main pores of the entering oil stage. The porosity is 5% 15%, and part of the pores is filled by hydrocarbon.