昌德含气系统成藏关键时刻的确定  

Key Time of Changde Gas System

作　　者：杨玉峰[1] 万俭英[1] 杨波[1] 栾长江 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]内蒙古煤田地质局109队,内蒙古海拉尔021001

出　　处：《大庆石油地质与开发》2002年第1期23-24,共2页Petroleum Geology & Oilfield Development in Daqing

摘　　要：应用镜质体反射率随浓度变化的三段式 ,建立了昌德地区主要烃源岩的热演化模式 ,同时计算了该区最大古埋藏深度以及古地温梯度。在热史模型研究的基础上 ,对含气系统中主要烃源岩沙河子组生、排烃史进行了模拟 ,给出了沙河子组的生气高峰为 10 0～ 80Ma (相当于青山口组和嫩江组沉积时期 ) ,其中最大峰值约为 90Ma (大约相当于青山口组沉积末期 )。最后指出 ,青山口组沉积末期是昌德地区深部含气系统成藏的关键时刻 。The change of vitrinite reflectance value with depth shows a three segments model, and using this model, the thermal evolution history of hydrocarbon source rock in Changde area has been studied. The former maximum burial depth(2 000 m deeper than today) of burial and paleogeothermal gradient (about 37 ℃/km)in this area can be resumed. Based on this thermal modeling, the history of gas generation and expulsion from source rocks in Changde area have been simulated. The main gas generation time of Shahezi Formation, which is main source rock in this area, is during 100 to 80 Ma, corresponding time is during the deposition of Qinshankou and Nenjiang Formation. The peak gas generation time is about 90 Ma, during later deposition of Qinshankou Formation, which is key time of Changde gas system, and the gas accumulation mainly took place during this period.

关 键 词：镜质体反射率 最大埋藏深度 古地温梯度 含气系统 烃源岩 沙河子组 油气藏 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]