塔河油田志留系油气成藏特征及勘探方向

Petroleum Accumulation Characteristics and Favorable Exploration Target of Silurian in Tahe Oilfield

塔河油田志留系油气显示良好,储层以中低孔、低渗为主,与上覆泥岩组成3套储盖组合,其圈闭和油气藏类型可分为构造油气藏、地层油气藏、岩性油气藏以及复合油气藏。通过原油地球化学特征、自生伊利石K-Ar测年及流体包裹体均一温度研究表明,志留系以多期充注、多期成藏为特征,主成藏期为加里东晚期、海西期和喜山晚期。油气成藏主要受构造及断裂发育程度、优质储层的控制,通过综合分析认为塔河南部地区是寻找构造地层类型油气藏的有利区,托普台地区是加里东晚期—海西期原生油气藏的有利勘探目标区。

The Silurian reservoir is advantageous for hydrocarbon accumulation and shows its richness in crude oil and gases in Tahe oilfield. The Silurian reservoir properties in general have medium-low porosity and perme- ability, and the overlaying shale form 3 sets of reservoir-cap assembles. The oil-gas reservoir types include anti- cline, stratigraphic, lithological and compound oil and gas reservoirs. The research indicates that the Silurian hydrocarbon accumulation characteristics are multistage charging and multistage hydrocarbon accumulation. The main periods of hydrocarbon accumulation are Late Caledonian, Hercynian and Late Himalayan. The formation and distribution of oil and gas pools are controlled by many factors, which include structure, development degree of fault, and high-quality reservoirs. The south part of Tahe oilfield is favorable area for tectono-strati- graphic reservoir exploration. The Tuoputai area of Tahe oilfield is favorable region for primary pool.