大民屯凹陷中——新元古界潜山油藏油源探析  

Study on oil source of the Meso-Neo Proterozoic buried hill reservoir in Damintun sag

作　　者：仇劲涛[1] 

机构地区：[1]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《油气地质与采收率》2014年第5期49-52,56,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"渤海湾盆地北部油气富集规律与增储领域研究"(2012ZX05006-005);中国石油天然气股份有限公司科技重大专项"辽河油田原油千万吨持续稳产关键技术研究"(2012E)

摘　　要：中—新元古界是否存在原生油气藏,一直存在较大的争议。在大民屯凹陷中—新元古界中发现了丰富的石油储量,一直认为是"新生古储"。从大民屯凹陷中—新元古界生烃能力入手,对该区中—新元古界潜山油源问题开展研究。研究区中—新元古界潜山原油具有凝固点高、含蜡量高、沥青质和胶质含量低的特征,与沙三段原油存在明显的差异。原油—烃源岩对比结果表明,中—新元古界原油与本层位烃源岩之间存在成因联系,虽然没有明确证据证实大民屯凹陷潜山原油来自中—新元古界,但可能存在中—新元古界原油的混入。大民屯凹陷中—新元古界的有机质丰度高、类型好,热演化程度适中,具有较强的生烃潜力,可能是中—新元古界油藏的重要油源。碳酸盐岩生油岩样品热模拟结果显示,中—新元古界烃源岩至今仍具有较强的生烃能力。There has been a great controversy over primary oil and gas reservoirs in the Meso-Neo Proterozoic. Meso-Neo Proterozoic primary reservoirs have not been found in China yet. Such findings will make a breakthrough in petroleum exploration of Meso-Neo Proterozoic. Abundant oil reserves have been found in the Meso-Neo Proterozoic of Damintun sag, which were considered as a type of young bed for source and old bed for storage. But in this study, the crude oil in the Meso-Neo Proterozoic reservoirs is different from that in the 3rd member of Shahejie Formation which indicates that other oil sources may exist. The Meso-Neo Proterozoic source rocks in the Damintun sag were studied and the result shows that they have high abundance and good type of organic matter, as well as a moderate degree of thermal maturation and a great potential of hydrocarbon generation. These all indicate that it may be an important oil source for the oil reservoirs in the Meso-Neo Proterozoic. The thermal simulation results of carbonate source rock samples show that the Meso-Neo Proterozoic source rocks have a good capacity of hydrocarbon generation.

关 键 词：中—新元古界 原生油气藏 油源对比 碳酸盐岩 大民屯凹陷 

分 类 号：TE112.114[石油与天然气工程—油气勘探]