特种油气藏2017，Vol.24Issue(2)：63-68,6.DOI:10.3969/j.issn.1006-6535.2017.02.012
文昌A凹陷地温-地压系统与油气成藏的关系
Geothermal-Geopressure System in the Wenchang A Sag and Its Relationship with Hydrocarbon Accumulation
摘要
Abstract
Geothermal-geopressure system (temperature-pressure system) may effectively control generation, migration and accumulation of hydrocarbons.To clarify specific features of the temperature-pressure system in Wenchang A Sag and its relationship with hydrocarbon accumulation, features of geothermal field, geopressure field and temperature-pressure system in Wenchang A Sag of the Pearl River Mouth Basin have been reviewed by using measured geothermal and geopressure data, together with acoustic logging and other data through principles related to the temperature-pressure system.In this way, correlation between temperature-pressure system and hydrocarbon accumulation can be clarified with regard to generation, preservation and distribution of hydrocarbons.Research results show the Wenchang A Sag has relative high geothermal gradient of 33.8℃/km on average.Such high gradient may facilitate maturing of organic matters and formation of hydrocarbons;Less compacted mudstone intervals distributed mostly in the Zhuhai Formation and Enping Formation.Such intervals may strengthen the capping capacities over hydrocarbons.Mudstone in the Zhujiang Formation contains no abnormal pressure.Instead, the interval is predominantly sealed under capillary pressure;The sag contain high-pressure composite temperature-pressure system.There are significant differences in energy of fluids contained in the 2 temperature-pressure systems.Hydrocarbons may migrate predominantly in vertical directions.Static temperature-pressure system in shallower formations may provide the most favorable conditions for enrichment and accumulation of hydrocarbons.In addition, hydrocarbon-bearing system in the Enping Formation can be considered as key exploration targets.Relevant research results may provide valuable references for exploration operations in the Pearl River Mouth Basin.关键词
温压系统/油气藏分布/地温场/地压场/文昌A凹陷/珠江口盆地Key words
temperature-pressure system/reservoir distribution/geothermal field/geopressure field/Wenchang A Sag/Pearl River Mouth Basin分类
能源科技引用本文复制引用
王柯,张洋,黄胜兵,陈景阳..文昌A凹陷地温-地压系统与油气成藏的关系[J].特种油气藏,2017,24(2):63-68,6.基金项目
国家科技重大专项"近海大中型油气田形成条件及勘探技术"(2011ZX05023-001) （2011ZX05023-001）
