松辽盆地东南隆起区增深3井上白垩统青山口组油页岩特征

为近一步了解松辽盆地东南隆起区上白垩统青山口组油页岩特征,对该地区新钻井增深3井青山口组全取芯井段进行了详细的岩芯观察、取样与测试等单井分析。结果表明:研究区增深3井青山口组共发育5层油页岩,主要形成于半深-深湖沉积环境,油页岩单层最厚达5 m;含油率为3.50%~7.34%,平均为4.73%;发热量分布范围为1 928.68~4 537.08 J/g,平均为2 691.42 J/g;灰分含量为82.65%~87.56%,平均为85.02%;全硫含量为0.59%~4.08%,平均为1.40%,为高灰分、低发热量、低硫、中--低品质油页岩。其中含油率与发热量、有机碳含量呈明显的正相关性,与灰分含量呈明显的负相关性,表明发热量、有机碳和灰分含量可作为油页岩含油率良好的替代指标。对油页岩段的测井曲线分析显示,油页岩层较泥岩具有高声波时差、高电阻率、低密度的特征,可作为识别油页岩的辅助标志。通过对样品岩石热解参数进行分析,表明油页岩中的有机质类型主要为Ⅰ型,其次为Ⅱ型,有机质成熟度处于未熟-低熟阶段。

Characteristics of oil shale from Upper Cretaceous Qingshankou Formation of Well Zengshen 3 in southeastern uplifted area，Songliao Basin

In order to further understand the oil shale characteristics of Upper Cretaceous Qingshankou Forma- tion in southeastern uplifted area，Songliao Basin，the detailed study of cores and testing for Well Zengshen 3 have been carry out． The results show that there are five oil shale layers developed in this well and deposited in the semi- deep or deep lake paleoenviroments． The maximal thickness is five meters． The oil content ranges from 3. 50% to 7. 34%，averaging of 4. 73%． The calorific and ash contents vary from 1 928. 68 J/g to 4 537. 08 J/g and 82. 65% to 88. 82%，averaging of 2 691. 42 J/g and 85. 63%，respectively． Total sulfur content is between 0. 59% and 4. 08%，with 1. 40% in average． All above analytical results suggest that the oil shale in the studied area has the characteristics of high- ash content，low- calorie and low sulfur content，showing as the medium- low quality oil shale． In addition，the positive correlation exists in oil content with calorific value and with TOC，whereas the neg- ative correlation exists between oil content with ash content． These indicators can be used as the good surrogate markers of oil yield． The well logging curve characteristics show that the oil shale layers has the characteristics of high acoustic travel time，high resistivity and low density characteristics compared with those of the mudstone lay- ers，which can be act as supplementary symbol to identify oil shale． With the analysis of rock pyrolysis parameters， the organic matter types of the oil shale is mainly type Ⅰ，and type Ⅱ secondly． The organic matter maturity in oil shale is immature- low mature．