摘要
为揭示古压力衰减梯度与含油气性的本质关系,以渤南洼陷沙三段为研究对象,以流体包裹体均一温度和冰点测试技术恢复的古压力数值作为过程控制,利用盆地模拟法恢复研究区主成藏期压力分布特征,并分析古压力梯度与含油气性的内在关系.研究表明,研究区主要油气成藏期(4.2 Ma至今)存在明显的超压,其中沙三下亚段古压力梯度高于沙三中亚段;古压力梯度高值区多发育于深洼带,近源区的断阶带和陡坡带的古压力梯度值变化相对平缓,缓坡带的古压力梯度值普遍较低.古压力梯度与含油气性关系密切:沙三下亚段源区古压力梯度高值区含油性好,沙三中亚段随古压力梯度增高油气显示变弱,油气环中心分布;近源区高古压力梯度代表较强的成藏动力,油气连片分布;远源区古压力梯度与含油气性关系较弱.
This study focuses on the characteristics of paleo-pressure gradient.Taking the Es3 in the Bonan sag as the research object,the paleo-pressure values of fluid inclusion uniform temperature and freezing point test technology were used as process control,and the basin simulation method was used to restore the pressure distribution characteristics during the reservoir period,on basis of which the paleo-pressure gradient of Es3z and Es3x in the Bonan sag were calculated,the distribution characteristics of the paleo-pressure gradient in the target stratum of the study area were revealed,and finally the relationship between paleopressure gradient and hydrocarbon containing was determined.The results show that the overpressure developed in the Bonan sag during the main hydrocarbon migration stage(4.2 Ma-now),paleo-pressure gradient of Es3x is higher than that of Es3z.As different structural zones,the high paleo-pressure gradient is often developed in the Bonan sag which is the active source area.The values of paleo-pressure gradient of Boshen 4 stepped belt and North steep slope are relatively gentle.The paleo-pressure gradient in South gentle slope is generally low.In the source area of the Es3x where the paleo-pressure gradient shows high hydrocarbon potential,and the Es3z where the hydrocarbon is distributed circularly around the center,this relationship is opposite.The high paleo-pressure gradient in the near source area represents a strong reservoir-forming power,and the hydrocarbon is distributed continuously.The relationship between the paleo-pressure gradient and the hydrocarbon potential in the far source area is weak.
作者
刘华
蒋子月
郝雪峰
宋国奇
冯月琳
李君
Liu Hua;Jiang Ziyue;Hao Xuefeng;Song Guoqi;Feng Yueling;Li Jun(Key Laboratory of Deep Oil and Gas,China University of Petroleum,Qingdao 266580,China;Shengli Oilfield,SINOPEC,Dongying 257001,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2020年第2期547-558,共12页
Earth Science
基金
国家自然科学基金(Nos.41972141,41772136)
国家重大专项(No.2016ZX05006-003).
关键词
渤南洼陷
古压力恢复
古压力梯度
含油气性
油气地质
Bonan sag
paleo-pressure recovery
paleo-pressure gradient
hydrocarbon containing
oil-gas geology
作者简介
刘华(1977-),女,教授,从事油气藏形成机理与分布规律研究和.ORCID:0000 0002 0357 367.E mail:liuhua77@upc.edu.cn
