摘要
利用镜质体反射率数据模拟计算了歧口凹陷24口井的热历史,模拟结果表明,沙河街时期的地温梯度高,每百米大约为5.0～5.6℃,东营时期每百米大约为4.5～5.0℃,馆陶时期每百米大约为3.5～4.5℃,现今的地温梯度每百米大约为3.1～3.2℃.利用包裹体均一温度和恢复样品的埋藏史、源岩的热演化史及生烃史,确定该区有两期油气充注期:第一期发生在东营末期;第二期为馆陶末期至现今.歧口凹陷的油气充注以第二期为主.利用PRA二维模拟软件对地质剖面进行油气运聚模拟,也得出歧口凹陷有两次油气聚集高峰,第一次为东营末期;第二次为馆陶末期至现今.
Thermal histories of 24 wells in Qikou sag are simulated by using vitrinite reflectance data. The simulation results show that the geothermal gradients are about 5.0～5.6℃/100m during the deposition of Shahejie Fm, 4.5～5.0℃/100m during the deposition of Dongying Fm, and 3.5～4.5℃/100m during the deposition of Guantao Fm, respectively. The current geothermal gradient is measured to be about 3.1～3.2℃/100m. Based on the homogenization temperatures of fluid inclusions, the restored burial history of core samples, and the thermal evolution and hydrocarbon generation histories of source rocks, there are two hydrocarbon charging stages in the study area. The first charging stage occurs at the end of deposition of Dongying Fm ; the second charging stage extends from the end of deposition of Guantao Fm to present time, and is the main charging stage of hydrocarbons in Qikou sag. Hydrocarbon migration and accumulation modeling with PRA 2D simulation software also show that there are two hydrocarbon accumulation peaks in Qikou sag, with the first one at the end of deposition of Dongying Fm and the second one from the end of deposition of Guantao Fm to present time.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2005年第4期505-511,共7页
Oil & Gas Geology
基金
国家重点基础研究发展计划973项目(G1999043302)
关键词
热演化史
油气成藏史
歧口凹陷
黄骅坳陷
Qikou sag
thermal history
hydrocarbon entrapment
fluid inclusion
basin modeling
