济阳坳陷胜坨油田原油物性及其成因探讨

Physical properties and genesis of oil in Shengtuo oilfield in Jiyang depression

朱光有 金强 周建林 王铜山 李剑 张林晔

Zhu Guangyou Jin Qiang Zhou Jianlin Wang Tongshan Li Jian Zhang Linye

依据原油的物理性质可将东营凹陷胜坨地区的原油分为稠油和正常稀油,稠油分布于浅层,是由沙河街组四段烃源岩提供的低熟油遭受次生改造而形成;正常稀油分布于深层的岩性和构造-岩性油气藏中,成熟度较高。按照硫含量,又可分为3类:高含硫原油分布于浅层,油-源对比表明该原油来自于盐湖-咸水湖的沙河街组四段烃源岩;低硫原油分布在深层的沙河街组三段储集层中,原油来自于淡水-半咸水沙河街组三段烃源岩;中等含硫原油则多为混源油。因此硫含量可以作为油源对比的一个有效指标。

Crude oil in Shengtuo oilfield in Dongying depression can be classified into heavy oil and normal light oil according to their physical properties.The former,accumulated in shallow reservoirs,are the result of secondary modification of low-maturity oil generated from the source rocks in the 4th member of Shahejie Formation;while the latter,accumulated in deep lithological and structural-lithological reservoirs, have high maturity. They can also be divided into three types according to their sulfur content.Oil with high sulfur content are distributed in shallow reservoirs and generated from source rocks deposited in salt or saline lake in the 4th member of Shahejie Formation; oil with low sulfur content are distributed in the deep 3rd member of Shahejie Formation and are generated from source rocks deposited in freshwater-brackish lake in the 3rd member of Shahejie Formation;while oil with medium sulfur content have mixed sources.Therefore, sulfur content can be used as an effective index for oil source correlation.

10.11743/ogg20040102