摘要
秦皇岛29.2高含CO_2气藏是秦南凹陷首个重大油气发现。基于天然气组分、稳定碳同位素、氦同位素等地球化学资料分析了天然气成因,并通过生烃史和流体包裹体特征分析了成藏期次和充注过程。结果表明:CO_2的成因类型为火山幔源型无机成因气,烃类气为来自邻近洼陷沙河街组的油型气;气藏具有晚期快速成藏的特征,CO_2与烃类应为同期充注,新近纪强烈活动的凸起边界断裂是其运移的主要通道,并且流体界面随着连续充注而逐渐降低。今后勘探应重视CO_2分布研究和预测。
The hydrocarbon discovery of Qinhuangdao 29-2 gas reservoir with high-content CO2 was first made in Qinnan Sag. Based on the geochemical data such as the natural gas components, stable carbon isotope, helium isotope etc, the gas genesis are analyzed. Meanwhile, hydrocarbon accumulation period and charging process are determined by the hydrocarbon generation history and fluid inclusion characteristics. Tire results show that the CO2 origin type is identified as volcanic mantle-source inorganic gas, the hydrocarbon gas is the oil-type gas from Es Formation of the nearby low; the gas reservoir is characterized by late and rapid accumulation, CO2 and hydrocarbon gas are charged simuhaneously, the rising boundary faults strongly activated at the late stage of Neogene are the main migrating channels and furthermore the fluid interfaces gradually drop with the continuous charge. The CO2 distribution study and prediction should be paid more attention in the future exploration.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2013年第2期22-26,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重大科技专项(2008ZX05023)
关键词
CO2
天然气
成因类型
成藏过程
秦南凹陷
CO2
natural gas
genetic type
reservoir-accumulating process
Qinnan Sag