A study of factors influencing activation energy of different types of source rocks in the Laizhou Bay Sag, Bohai Sea
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摘要: 选取不同干酪根类型的低熟烃源岩作为剖析对象，从干酪根类型、干酪根中有机硫含量、可溶有机质和黏土矿物对烃源岩活化能的影响进行研究，结果表明：Ⅱ1和Ⅰ干酪根活化能分布范围窄，Ⅱ2和Ⅲ干酪根活化能分布范围宽，干酪根平均活化能Ⅲ>Ⅱ2>Ⅰ>Ⅱ1；有机硫含量高的干酪根平均活化能低，有机硫对烃源岩生烃起催化作用；可溶有机质的存在影响烃源岩平均活化能的大小和分布特征，可溶有机质分布在活化能低值区间，对烃源岩生烃起催化作用；烃源岩黏土矿物中伊/蒙混层含量高，平均活化能高；伊利石含量高，平均活化能低，伊利石对烃源岩生烃起催化作用。Abstract: In this article, low-maturity source rocks of different kerogen types from the Laizhou Bay Sag are selected to study the correlation of activation energy with kerogen type, organic sulfur content in kerogen, soluble organic matter and clay minerals. The correlation analyses show that activation energy of TypeⅡ1 and TypeⅠ kerogens cover a wide distribution range, while TypeⅡ2 and Type Ⅲ a narrow one, and the average activation energy of kergens follows that Type Ⅲ>TypeⅡ2>TypeⅠ>TypeⅡ1; As the content of organic sulfur in kerogen increases, the average activation energy decreases, and organic sulfur of kerogen plays a catalytic role in hydrocarbon generation; Soluble organic matter affects the size and distribution characteristics of the average activation energy, and it distributes in the interval of low activation energy. It also plays a catalytic role in hydrocarbon generation. The content of Aemon mixed layer in clay minerals of source rock is positively correlated with the average activation energy, while illite shows a negative correlation with the average activation energy, working as a catalyst for hydrocarbon generation as well.
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Key words:
- kerogen type /
- average activation energy /
- dissoluble organic matter /
- organic sulfur /
- clay minerals
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图 2 不同类型干酪根活化能分布图
a—Ⅰ型干酪根活化能分布范围；b—Ⅱ1型干酪根活化能分布范围；c—Ⅱ2型干酪根活化能分布范围；d—Ⅲ型干酪根活化能分布范围
Figure 2. Activation energy distribution ranges in different types of kerogens
(a)Activation energy range of Ⅰ type of kerogen; (b)Activation energy range of Ⅱ1 type of kerogen; (c)Activation energy range of Ⅱ2 type of kerogen; (d)Activation energy range of Ⅲ type of kerogen
图 3 抽提可溶有机质后不同类型烃源岩平均活化能与黏土矿物含量
Figure 3. Correlation of average activation energy and clay minerals contents in different types of extracted source rocks
表 1 不同类型烃源岩地球化学数据
Table 1. Geochemical data of different types of source rocks
编号 样品类型 RO/ % S1/ (mg/g) TOC/ % HI/ (mg/g) S1+S2/ (mg/g) H/C O/C 腐泥组/ % 壳质组/ % 镜质组+ 惰质组/% 类型指数 干酪根类型 1 岩屑 0.40 0.13 0.30 233 0.83 / / 3 41 56 -21 Ⅲ 2 岩屑 0.45 0.21 0.66 208 1.58 0.88 0.22 8 73 19 29 Ⅱ2 3 岩屑 0.54 1.73 2.37 423 11.76 0.99 0.15 68 23 9 72 Ⅱ1 4 岩屑 0.61 1.77 3.50 546 20.89 1.17 0.12 76 21 3 84 Ⅰ 5 岩屑 0.60 1.36 4.43 598 27.83 1.07 0.11 50 46 4 70 Ⅱ1 6 岩屑 0.49 3.10 5.39 713 41.53 1.26 0.06 92 7 1 95 Ⅰ 
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表 2 不同类型干酪根活化能数据
Table 2. Activation energy data of different types of unextracted source rocks
编号 干酪根类型 Emin-max/ (kJ/mol) 干酪根平均活化能/ (kJ/mol) RO/ % 1 Ⅲ 205~322 268 0.4 2 Ⅱ2 159~284 261 0.45 3 Ⅱ1 142~217 209 0.54 4 Ⅰ 213~230 227 0.61 5 Ⅱ1 147~220 218 0.6 6 Ⅰ 219~241 237 0.49
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表 3 不同类型烃源岩氯仿沥青“A”含量与抽提前后活化能数据
Table 3. Chloroform asphatt "A" values and activation energy values before and after the extraction in different types of source rocks
编号 干酪根类型 Emin-maxSE/(kJ/mol) Emin-max/(kJ/mol) Emin-max/′(kJ/mol) 平均活化能/(kJ/mol) 氯仿沥青“A”/% 可溶有机质 未抽提 抽提后 未抽提 抽提后 1 Ⅲ 197~212 197~322 212~330 243 255 0.09 2 Ⅱ2 117~134 117~235 134~251 229 251 0.08 3 Ⅱ1 138~189 138~214 189~231 192 201 0.28 4 Ⅰ 176~219 176~226 219~234 200 220 0.44 5 Ⅱ1 147~210 147~210 210~222 198 210 0.37 6 Ⅰ 184~218 184~226 218~230 211 228 0.47
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表 4 不同类型干酪根活化能与干酪根有机硫含量
Table 4. Activation energy values and kerogen organic sulfur contents in different types of kerogens
编号 干酪根类型 干酪根硫含量/% 抽提后干酪根平均活化能/(kJ/mol) 1 Ⅲ 2.2 268 2 Ⅱ2 2.6 261 3 Ⅱ1 7.7 209 4 Ⅰ 10.3 227 5 Ⅱ1 11.3 218 6 Ⅰ 10.1 237
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表 5 不同类型烃源岩活化能与黏土矿物含量
Table 5. Activation energy values and clay mineral contents in different types of source rocks
编号 干酪根类型 蒙脱石/ % 高岭石/ % 绿泥石/ % 伊利石/ % 伊/蒙混层/ % 抽提可溶有机质后烃源岩平均活化能/(kJ/mol) 抽提后干酪根平均活化能/(kJ/mol) 1 Ⅲ 0 5 4 30 61 255 268 2 Ⅱ2 0 7 7 29 57 251 261 3 Ⅱ1 0 7 4 36 53 201 209 4 Ⅰ 0 4 2 42 52 220 227 5 Ⅱ1 0 5 3 37 55 210 218 6 Ⅰ 0 9 3 33 55 228 237
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