0 引言
1 区域地质背景
2 烃源岩岩性
3 地球化学特征
3.1 有机质丰度
3.2 有机质类型
图6 基于氯仿沥青“A”族组分的J2烃源岩生烃母质类型解释图版Fig.6 The identifying chart of hydrocarbon-generating parent material types based on the group components of chloroform bitumen “A” of the J2 source rocks |
3.3 有机质成熟度
图8 J2 d 7烃源岩镜质体反射率(R O)分布范围Fig.8 Distribution range of vitrinite reflectance values(R O) of J2 d 7 source rocks |
表1 不同凹陷内J2 d 7烃源岩热解峰温(T max)与镜质体反射率(R O)Table 1 Pyrolysis peak temperature(T max) and vitrinite reflectance values(R O) of J2 d 7 source rock in different depressions |
3.4 综合评价
表2 柴北缘东段侏罗系凹陷J2 d 7烃源岩综合评价表Table 2 Comprehensive evaluation table of J2 d 7 source rocks in Jurassic depressions in the eastern section of northern margin of the Qaidam Basin |
凹陷 | 丰度(TOC,平均值)/% | 类型 | 成熟度(R O)/% | 综合评价等级 |
---|---|---|---|---|
红山凹陷 | 5.80 | Ⅰ—Ⅱ2 | 0.53~1.18 | 1 |
鱼卡凹陷 | 5.68 | Ⅰ—Ⅱ2 | 0.35~1.13 | 2 |
小柴旦凹陷 | 4.24 | Ⅰ—Ⅱ1 | 0.42~0.63 | 2 |
霍布逊凹陷 | 2.13 | Ⅱ—Ⅲ | 0.50~0.96 | 3 |
德令哈凹陷 | 差—优质,数据较少 | Ⅱ—Ⅲ[25] | 0.82~0.83 | 3 |