珠江口盆地(东部)地层岩性油气藏勘探有利区域分析

An analysis of favorable exploration areas for stratigraphic-lithologic hydrocarbon accumulaion in the eastern Pearl River Mouth basin

近源多变的陆相沉积、物源丰富的古珠江三角洲沉积、礁滩发育的碳酸盐岩沉积、扇体发育的深海沉积等四大沉积体系以及频繁的海(湖)平面升降与多期次构造活动,共同构成了珠江口盆地(东部)地层岩性圈闭优势发育的地质背景。在对上述地质背景研究的基础上,总结出了珠江口盆地(东部)发育古珠江三角洲前缘、古珠江三角洲与古韩江三角洲交互区、古珠江三角洲与碳酸盐岩交互区、生物礁滩发育区、深水扇与斜坡扇发育区等有利区带,分析了该地区上构造层地层岩性圈闭的分布规律;进一步总结出了该地区上构造层地层岩性圈闭成藏的四大优势条件,并在富烃凹陷油气分布范围内划分出了6个地层岩性油气藏勘探有利区域,揭示出了该地区具有巨大的地层岩性油气藏勘探潜力。

In the eastern Pearl River Mouth basin,the four sedimentary systems such as proximal and changeful nonmarine deposit,Pearl River paleaodelta with abundent provenance materials,carbonate deposit with developed reefs and banks and deep-sea deposit with developed fans,the frequent fluctuations of sea （or lake） level and the multiple episodes of tectonism may commonly resulted in the geological setting favorable to the development of stratigraphic-lithologic traps.By probing into this geological setting,several favorable plays were identified,including the front of Pearl River paleaodelta,the interactive zone between Pearl River paleaodelta and Hanjiang paleaodelta,the interactive zone between Pearl River paleaodelta and carbonate rocks,the reef and bank zone and the zone of deep water fan and slope fan,and the distribution pattern of stratigraphic-lithologic traps in the upper structural interval was analyzed there.Furthermore,four favorable conditions were summarized for stratigraphic-lithologic hydrocarbon accumulation in the upper structural interval,and six favorable exploration zones for this type of hydrocarbon accumulaion were designated within the hydrocarbon distribution area of the hydrocarbon-rich sag,showing a great exploration potential of stratigraphic lithologic hydrocarbon accumulation in this area.