关键词: 层序不整合面；溶蚀作用；白云岩；寒武系&mdash, 奥陶系；塔中地区

Abstract:

Liaohe Depression is a Paleogene oil-bearing basin, which overlaps Mesozoic basin. Paleogene Shahejie Formation mainly formed during the faulted period. The formed clastic reservoir has high porosity and permeability, which was mainly resulted from the original sedimentation and later diagenesis. The study result shows that the main factors for the forming of the Paleogene high-quality reservoir in Liaohe Depression include: coarse particles of clastic reservoir, little content of matrix and cement, secondary pore developed well, lack of land sources and syndepositional carbonate, oil migrated into the reservoir early and the reservoir buried shallowly. It is believed that the deep reservoir of Paleogene Shahejie Formation in Liaohe Depression has great oil and gas exploration potential.

Key words: sequence unconformity boundary, karstification, dolomite, Cambrian-Ordovician, Tazhong area