东西伯利亚地台碳酸盐岩成藏条件对我国油气勘探的启示

东西伯利亚地台里菲纪（1 650～800 Ma）和文德纪（670～590 Ma）碳酸盐岩大油气田形成的有利条件为：里菲纪坳拉谷演化阶段形成暗色泥页岩优质烃源岩，克拉通盆地长期发育的古隆起是油气富集的主要区带，稳定分布的膏盐岩盖层是古油藏保存的关键，构造背景上的地层岩性油气藏是主要成藏类型。 对比我国四川、塔里木及鄂尔多斯盆地，均具有碳酸盐岩储层非均质性强、变化快的共性特征，差异性包括我国叠合盆地下组合泥页岩烃源岩生烃指标变化大、中-新生界沉积厚度大及下组合埋藏深度大等。我国碳酸盐岩油气勘探要系统评价震旦系、寒武系暗色泥页岩烃源岩条件以及多期改造作用叠合盆地的盖层条件，突出构造背景上的地层岩性油气藏勘探。 近期勘探要立足大盆地，寻找构造大背景，主攻构造岩性复合大区带。 以四川、塔里木和鄂尔多斯盆地为重点，持续开展大型古隆起复式油气聚集带勘探，加大区域不整合面、古隆起斜坡带、大型地层剥蚀尖灭带、台缘带礁滩体及与蒸发岩共生的台内颗粒滩地层岩性油气藏勘探。

Carbonate reservoir forming conditions of East Siberia platform and its inspiration to oil and gas exploration in China

The advantages of huge carbonate reservoirs in Riphean period （1 650～800Ma） and Wendian period （670～ 590 Ma） of East Siberian platform include the following aspects: the formation of high quality source rock of dark shale during the Riphean Aulacogen evolution stage, the long-term developed paleo-uplifts within the craton basins are the major oil and gas enrichment zones, the stable distributed cap rock of gypsum is the key for the preservation of ancient reservoirs and the lithologic reservoir with structural background is the main reservoir type for petroleum accumulation. Comparing with the Sichuan, Tarim and Ordos basins in China, the common features of carbonate reservoir in these basins include strong heterogeneity and rapid lateral alternation. The differences include the significant changing of hydrocarbon generation indicators of shale source rock, the large thickness of Mesozoic to Cenozoic sedimentation and the deep burial of the lower combination within the superimposed basins. The carbonate exploration in China should comprehensively focus on the following aspects: evaluate the shale source rock of Sinian and Cambrian, evaluate the cap-rock condition of multi-phase reconstruction superimposed basin and enhance the exploration of lithology reservoir with structural background. The recent exploration should focus on great basins, seek the great structural background and develop the great combination zones of structure and lithology. Focusing on Sichuan, Tarim and Ordos basins, we should carry out structural reservoirs exploration of large-scale uplifts and buried hills and stratigraphy and lithologic reservoirs exploration of regional unconformity, slope zones of paleo-uplifts, great pinch-out zones of strata, reef on platform margin and grain banks symbiosis with evaporate rock within platform.