摘要
深部热流体被越来越多证实参与油气成藏的全过程。通过岩心、岩石学、流体包裹体及有机地球化学等资料,系统探讨了研究区(秦皇岛29-2/2E油气田)深部热流体活动的详细证据及其对油气成藏的意义。研究表明:古近系储层流体包裹体测温见异常高温包裹体;天然气藏中发现CO_(2)为火山幔源无机成因气;方解石脉体氧同位素测试值远高于围岩且受高温热液影响;沉积物中发现立方体、五角十二面体黄铁矿,Co/Ni值大于1,为热液成因。热流体对该区油气成藏包括生排烃和储层改造两方面:热流体促进该区烃源岩演化,提升生烃量;热流体对储层物性改造既有溶蚀改造的积极建设作用,又有热液方解石和晚期白云石胶结充填破坏作用。
Deep fluid was increasingly identified involved in all processes of hydrocarbon accumulation. Based on data from drilling core,petrology,fluid inclusions and organic geochemistry,we discussed the detailed evidences of the activities of the deep fluid as well as its effect on hydrocarbon accumulation. The evidences include:(1)Abnormal high-temperature fluid inclusions in Paleogene reservoir;(2)CO_(2) gas in discovered reservoir being inorganic origin from volcanic mantles;(3)Oxygen isotopic values in calcite filled veins much higher than surrounding rock;(4)Cubic and pyritohedron pyrite found in sediments with Co/Ni ratio more than 1 indicating hydrothermal origin. These all showed that there might be deep fluid participated in the reservoir accumulation,the affection of which includes hydrocarbon generation and expulsion as well as reservoir reconstruction. The deep fluids promoted the evolution of source rocks in this area and increased hydrocarbon generation volume. As for reservoir quality,it has the constructive role of hydrothermal corrosion and the destructive role of hydrothermal calcite and late dolomite cement and filling.
作者
张藜
张新涛
刘艺萌
韩芮
魏国财
ZHANG Li;ZHANG Xin-tao;LIU Yi-meng;HAN Rui;WEI Guo-cai(Tianjin Branch of China National Offshore Oil Corporation Limited,Tianjin 300459,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2021年第5期633-644,共12页
Natural Gas Geoscience
基金
“十三五”国家科技重大专项子课题“渤海辽东湾地区潜山富烃凹陷成藏研究与有利勘探方向预测”(编号:2016ZX05024-002-006)资助.