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非洲G盆地是受中非剪切带影响而发育形成的典型被动裂谷盆地,其南部凹陷带为盆地主要油源区。为进一步明确G盆地油气勘探方向,需开展盆地南部凹陷热演化史及油气成藏方面的研究。油层测温表明,南部凹陷现今平均地温梯度为3.9 ℃/100 m,属于中温型地温场。根据镜质体反射率、包裹体测温恢复了G盆地凹陷带古地温演化史,研究表明G盆地凹陷白垩纪古地温梯度为2.4～3.77 ℃/100 m,古地温梯度低于现今地温梯度。古地温恢复及热史模拟表明最高地温是在现今达到的,下白垩统烃源岩热演化程度主要受现今地温场控制。包裹体均一温度分析表明G盆地南部凹陷存在两次流体作用事件,分别发生在晚白垩世早期(96.0～87.0 Ma)及第四纪(3.0～0 Ma)。下白垩统油气的主要成藏期在晚白垩世早期。 相似文献
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宁武-静乐盆地是华北地区重要的含煤构造盆地,是山西省煤层气勘探主要区域。本文基于镜质组反射率及磷灰石裂变径迹古温标,恢复了盆地的构造-热演化史。研究结果表明,石炭系太原组煤层的Ro值主要反映中生代晚期地层达到最大埋深时的古地温状况,根据最大古埋藏深度,获得盆地的古地温梯度约3.88 ℃/100 m～4.34 ℃/100 m。裂变径迹资料抬升冷却分析,得出盆地经历了70～63 Ma和38～20 Ma以来的两次快速抬升。构造-热演化史研究表明,盆地经历的最大古地温时期是在晚侏罗世-早白垩世达到的,该时期是煤层气主要生成期。晚白垩世期盆地抬升冷却,地温明显降低,生气作用减弱及停止。镜质组反射率和裂变径迹所揭示的热演化史对于深化认识宁武-静乐盆地的煤层气勘探开发具重要意义。 相似文献
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Zhang Chuang Luo Ranhao Zhang Hengchang Zhou Xue Wang Chenglong Xing Hua Qian Cheng 《地球科学进展》2017,32(7):744-756
This research took Lower Shihezi Reservoir in Yan’an, Ordos Basin as research object. Based on the achievement of former scholars, the article first analyzed burial history and palaeogeothermal history. Furthermore, it analyzed the diagenesis characteristics and divided the diagenetic stages through the application of test data, such as thin section, SEM, cathode luminescence, x-ray diffraction, homogenization temperature of fluid inclusion, etc. Finally, the article analyzed and identified the initial porosity model and various kinds of porosity evolution model in the process of diagenetic, optimized the suitable method of Lower Shihezi Reservoir, established a calculation method that the porosity of reservoir increased in the process of dissolution by applying the effect simulation, simulated porosity evolution of reservoir in research area and analyzed the porosity evolution model. The results showed that the reservoir of quartzose sandstone with moderate palaeogeothermal, long period of large buried-depth, carbonate cement was absent in early phase in the coal measure strata, and the porosity loss by compaction was substantial. Though secondary porosity was generated by dissolution, the quartz and clay mineral were precipitated from dissolution mass, which filled intergranular pores and dissolved pores. In addition to substantial porosity loss by compaction, the filling of massive quartz overgrowth, clay mineral, and ferrocarbonatite, always made such reservoirs to be low or ultra-low permeability reservoirs. 相似文献
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