MECHANISM OF HYDROCARBON POOLING IN THE ORDOVICIAN CARBONATE RESERVOIRS IN TAZHONG AREA OF THE TARIM BASIN
MECHANISM OF HYDROCARBON POOLING IN THE ORDOVICIAN CARBONATE RESERVOIRS IN TAZHONG AREA OF THE TARIM BASIN
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发表时间：
2008
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通讯作者：
Xiaolong Qin
中科院分区：
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作者：
Xiaolong Qin
在塔里木盆地塔中Ⅰ构造带发现了奥陶系生物礁型凝析气田，是目前国内发现的最大的非常规油气藏，油气分布复杂，通过对其地质条件和油气成藏机理的研究，得出以下认识：目前发现的油气主要为分布于大型台地边缘的奥陶系良吕组生物礁滩储层，这些生物礁滩储层沿台地边缘沿着广泛分布，垂向叠置，横向连通，以次生溶蚀孔隙型低孔低渗储层为主，塔中Ⅰ构造带具有多期油气充注调整和生储盖组合良好的特点，储层是油气富集的主要控制因素，低孔低渗的非均质碳酸盐岩储层是油气差异性赋存的基础，多期充注是油气水分布复杂的主要原因，晚期气侵是非常规凝析油气藏形成的主要机制，多期充注和储层非均质性共同导致了非常规凝析油气藏的形成，油气赋存的复杂性。
An Ordovician condensate gas field of bioherm type has been discovered in the structural zone Tazhong Ⅰ of the Tarim basin.It is the largest unconventional hydrocarbon reservoir discovered in China by now,with complicated distribution of oil,gas and water but no obvious edge or bottom water.The following understandings are obtained through study of its geologic conditions and mechanism of hydrocarbon pooling.The current discovered oil and gas are mainly distributed in the Ordovician Lianglitage Fm reef and bank reservoirs on a large platform margin.These reef and bank reservoirs are widely distributed along the platform margin with vertically superimposed and laterally connected,and are dominated by low-porosity and low-permeability reservoirs of secondary dissolution pore-cavity type.The structural zone TazhongⅠ is characterized by multistage hydrocarbon charging and adjustment and favorable combination of source-reservoir-cap rocks,with reservoir as the major controlling factor of hydrocarbon enrichment.The heterogeneous carbonate reservoirs with low porosity and low permeability are the basis of differential hydrocarbon occurrence,and multistage charging is the main cause of the complicated distribution of oil,gas and water,while late gas invasion is the main mechanism of formation of unconventional condensate reservoirs.The multistage charging and reservoir heterogeneity jointly causes the complexity of oil and gas occurrence.