Controlling factors of tight sandstone reservoirs of Iiaohe Oilfield depression are determined based on the log data analyses of tight sandstone reservoirs in Paleaogene, well test data and production data. The study recognizes that the diageneses of compaction, cementation and corrosion are not the key factors of the formation of the tight sandstone reservoirs, however, mierofaeies is the key factor of the formation of high quality tight sandstone reservoir distribution. Thus, the prediction method of effective reservoirs by 3 梖acies combination, namely, depiction of mierofaeies forming tight sandstone, grain facies description and sorting iacies prediction, is formed. The 3 -facies combination can definitely determine high quality reservoir distribution of tight sandstone reservoirs.%通过古近系致密砂岩取心井段的测试资料分析,结合试油、投产等勘探成果数据,确定了辽河坳陷古近系致密砂岩储层的控制因素.研究认为,古近系致密砂岩储层中压实、胶结、溶蚀等成岩作用均是控制致密砂岩储层形成的非主要控制因素,通过对比分析发现,沉积微相控制了致密砂岩优质储层分布.由此出发,形成致密砂岩沉积微相刻画、颗粒相描述以及分选相预测“三相”结合的致密砂岩有效储层地质预测方法,利用“三相”结合能够准确确定致密砂岩“优质储层”分布.
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