珠江口盆地番禺低隆起油气成藏条件分析  

An analysis of hydrocarbon pooling conditions in Fanyu low uplift in the Pearl River Mouth basin

作　　者：谢利华[1] 林畅松[1] 周彤[2] 张博[1] 崔立叶[1] 

机构地区：[1]中国地质大学·北京 [2]中国石化国际石油工程有限公司

出　　处：《天然气工业》2009年第1期30-34,共5页Natural Gas Industry

摘　　要：从油气藏的成藏条件研究出发,建立了珠江口盆地番禺低隆起油气藏的成藏模式,并对油气藏分布进行了预测。结果表明:①珠江口盆地番禺低隆起天然气主要源自古近系恩平组烃源岩的干酪根热裂解气,凝析油主要来源于恩平组烃源岩;②低隆起东部有一个北东向并向北掀斜的隆起脊,为油气低势区,油气汇集于此并向北部运移;③控洼反向断裂一直是油气垂向运移的通道,雁行断裂系是断块升降期油气垂向运移的通道,顺向同沉积断层是断坳过渡期和坳陷期油气垂向运移的通道;④渗透砂体和长期风化剥蚀的不整合面是油气侧向运移的通道。油气藏分布预测结果:受构造演化和沉积作用的控制,油气藏多分布于珠江组底部和韩江组中下部;雁行断裂带主要发育断鼻构造油气藏,顺向断裂带发育构造—岩性或逆牵引背斜油气藏。在该区同沉积断裂坡折带已成功钻获了构造—岩性油气藏。Based on a research on hydrocarbon pooling conditions,this paper builds up hydrocarbon pooling models and predicts reservoir distribution in Fanyu low uplift of the Pearl River Mouth basin. Four hydrocarbon pooling models are obtained as follows:a. the gas accumulated in Fanyu low uplift in the Pearl River Mouth basin was mainly sourced from the thermal cracking gas of kerogen in the Paleogene Enping formation source rocks,while the gas condensate was mainly generated by the Enping formation source rocks; b. the NE-trending and North-tilting rise crest located in the eastern part of the low uplift is a low oil and gas potential area where hydrocarbons first accumulated and then migrated northward; c. the antithetic faults acted as the pathways of hydrocarbon migration in every stage of basin evolution,the en echelon fault systems acted as the vertical pathways of hydrocarbon migration during the uplifting and subsidence stages of fault blocks and the synthetic synsedimentary faults were the vertical pathways of hydrocarbon migration in the transition stage from fault depression to down warping and in the down warping stage. d. the permeable sand bodies and unconformities formed through long-term weathering and erosion acted as the lateral pathways of hydrocarbon migration. The results of the distribution of the hydrocarbon pooling can be summarized as follows:a. reservoirs are mostly distributed at the base Zhujiang formation and the Middle-Lower Hanjiang formation due to the control of structural evolution and sedimentation; b. fault-nose structural reservoirs mainly occur in the en echelon fault zones,while structural-lithologic reservoirs or dip reversal anticline reservoirs are developed in the synthetic fault zones. Finally,this paper indicates that the Structural-lithologic reservoirs have been successfully discovered in the slope break zone of the synsedimentary fault in the study area.

关 键 词：珠江口盆地 番禺低隆起 油气藏形成 条件 分布 预测 

分 类 号：P618.13[天文地球—矿床学]