Thermal Evolution Modeling and Characteristic of Source Rock of Paleogene in Beitang Sag
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摘要: 根据大量的烃源岩地球化学数据, 分析了北塘凹陷古近系烃源岩的地球化学特征, 从有机碳含量(TOC)、氯仿沥青"A"、总烃含量、S1+S2、有机质类型和成熟度(Ro)等方面对古近系烃源岩进行了系统分析, 结果表明北塘凹陷东三段、沙一段和沙三段是本区的烃源岩层段, 其中沙三段烃源岩生烃指标最好, 是本区的主力烃源岩层段.烃源岩的模拟结果表明: (1)北塘凹陷的烃源岩门限深度为2 390 m, 门限温度为94.2℃, 进入生烃门限的时间约为25~28 Ma; (2)北塘凹陷沙三段的现今地层温度为140~160℃, Ro达0.9%~1.4%, 正处于生油高峰期; 沙一、二段的现今地层温度为100~140℃, Ro达到了0.75%~1.0%左右, 已进入中等成熟阶段; 东营组的现今地层温度为80~100℃, Ro为0.45%~0.75%, 处于低-中等成熟阶段.Abstract: Based on large quantity of organic geochemistry data, the geochemistry characteristics are systematically analyzed on organic carbonate content (TOC), chloroform bitumen "A", overall hydrocarbon content, S1+S2, organic matter types and maturity (Ro%) and so on. It shows that the Dong 3 Member, Sha 1 Member and Sha 3 Member are the main oil source beds of Beitang sag, especially, Sha 3 Member is the best in source rock quality. The model results indicate that (1) The depth of oil generative threshold is about 2 390 m, and the temperature is about 94.2℃, and the time entering on the oil generative threshold is from 25 Ma to 28 Ma in Beitang sag; (2) The present-day temperature of Sha 3 Layer is 140-160℃, the present-day Ro ranges between 0.9%-1.4%, It is in its peak of oil generation. The temperature of Sha 1+2 Layer is 100-140℃, the Ro ranged between 0.75%-1.0%, which suggests that it is in the middle-maturity at present. The present-day temperature of Dongying Layer is 80-100℃, the present-day Ro ranges between 0.45%-0.75%, which indicates that the present-day source rocks are in low maturation.
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Key words:
- Beitang sag /
- Paleogene /
- source rock /
- thermal evolution history modeling /
- sedimentology
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表 1 北塘凹陷古近系有机质丰度统计
Table 1. Abundance of organic of Paleogene in Beitang sag
层位 有机碳
(TOC, %)氯仿沥青“A”
(EOM, %)总烃
(10-6)生烃潜量
(S1+S2, mg/g)Ed3 $\frac{\text{0}\text{.52}\sim \text{1}\text{.03}}{\text{0}\text{.64(58)}}$ $\frac{\text{0}\text{.006}\sim \text{0}\text{.192}}{\text{0}\text{.023(15)}}$ $\frac{\text{55}\sim \text{151}}{\text{79(10)}}$ $\frac{\text{0}\text{.32}\sim \text{5}\text{.96}}{\text{2}\text{.91(8)}}$ Es1 $\frac{\text{0}\text{.64}\sim \text{1}\text{.22}}{\text{0}\text{.79(78)}}$ $\frac{\text{0}\text{.008}\sim \text{0}\text{.242}}{\text{0}\text{.032(8)}}$ $\frac{\text{75}\sim \text{224}}{\text{141(6)}}$ $\frac{\text{1}\text{.45}\sim \text{9}\text{.61}}{\text{4}\text{.42(6)}}$ Es31 $\frac{\text{0}\text{.63}\sim \text{2}\text{.65}}{\text{1}\text{.17(246)}}$ $\frac{\text{0}\text{.018}\sim \text{0}\text{.331}}{\text{0}\text{.062(58)}} $ $\frac{\text{175}\sim \text{325}}{\text{271(33)}}$ $\frac{\text{2}\text{.22}\sim \text{13}\text{.24}}{\text{5}\text{.33(150)}}$ Es32 $\frac{\text{0}\text{.74}\sim \text{2}\text{.01}}{\text{1}\text{.23(147)}}$ $\frac{\text{0}\text{.014}\sim \text{0}\text{.412}}{\text{0}\text{.112(57)}}$ $\frac{\text{478}\sim \text{1 032}}{\text{609(19)}}$ $\frac{\text{2}\text{.41}\sim \text{15}\text{.29}}{\text{6}\text{.59(112)}}$ Es33 $\frac{\text{0}\text{.70}\sim \text{9}\text{.73}}{\text{1}\text{.11(18)}}$ $\frac{\text{0}\text{.023}\sim \text{0}\text{.302}}{\text{0}\text{.076(9)}}$ $\frac{\text{152}\sim \text{778}}{\text{394(5)}}$ $\frac{\text{1}\text{.52}\sim \text{9}\text{.77}}{\text{6}\text{.32(205)}}$ 注:(1)表格中的数据含义$\frac{最小值\sim 最大值}{平均值(样品数)}$;(2)东三段和沙一段数据为1999年所测数据①,沙三1段、沙三2段、沙三3段三组数据中增加了2005年以来所测的数据. -
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