南襄盆地泌阳凹陷核二段未熟-低熟油勘探潜力分析

对泌阳凹陷核二段沉积环境、沉积特征和烃源岩有机质丰度、类型、演化程度等研究表明,位处深凹的安棚地区发育的泥质岩为未熟—低熟烃源岩,属较好—好的生油岩,提供了丰富的油源。油源对比证实,白云岩区外围的砂泥岩区同样存在有未熟—低熟油,且与白云岩区的未熟—低熟油有相似的地球化学特征,它们均来自核二段泥质烃源岩。安棚白云岩区南北两侧附近的砂泥岩区具有勘探未熟—低熟油藏的潜力。

ANALYSIS ON EXPLORING POTENTIAL OF Eh2 IMMATURE AND LOW-MATURE OIL IN THE BIYANG DEPRESSION OF THE NANXIANG BASIN

On basis of the depositional environment of member H-2 of Tertiary (Eh~2) and the content, type and maturity of organic matters of source rocks in Biyang Depression of the Nanxiang Basin, it was indicated that mudstone in Anpeng area of the depression was the main immature and low mature source rocks. The mudstone was deposited in deep lake enviroment and could provide abundant immature oil as a result of its good organic type and relative shallow burial depth. Results of correlation of oil and source rock showed that there also was immature and low-mature oil in sandstones in the periphery of dolomite, which had same geochemical characteristics, indicating the same source rocks. There is favorable potential for exploration of immature and low-mature oil in sandstones distributed in both northern and southern sides of Anpen dolomite area.