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利用海上钻井分析测试、地震等资料,运用油气地球化学、成藏综合研究方法,重新研究了珠江口盆地西部文昌A凹陷上渐新统珠海组主要低渗凝析气藏天然气成因与成藏模式。研究认为,文昌A凹陷天然气组分以烃类气为主,为成熟的油型气,有别于邻区莺—琼盆地崖城13-1气田的煤型气。文昌A凹陷天然气源自下渐新统恩平组,且恩平组发育大范围的母质类型较好的浅湖相沉积,提升了该区油气资源潜力。5Ma以来天然气充注珠海组圈闭,目前珠海组储层因埋深大而变得致密。气源充足、源—储紧邻且压差大、油气运移通道畅通,是文昌A凹陷珠海组低渗气藏形成的主控因素与地质条件。
Using the data of offshore drilling analysis and testing and seismic data, the author uses the methods of hydrocarbon geochemistry and hydrocarbon accumulation to study the natural gas genesis and accumulation pattern of the Zhuhai Formation main low permeability condensate gas reservoir in the upper Wenchang A depression in the west of the Pearl River Mouth Basin . The study shows that the natural gas component of Wenchang A depression is dominated by hydrocarbon gas and mature oil gas, which is different from the coal gas of Yacheng 13-1 gas field in the Ying-Qiong basin. The natural gas in Wenchang A depression originated from the Lower Oligocene Enping Formation, and the Enping Formation developed a large range of shallow lacustrine deposits with good parental qualities, thus enhancing the potential of oil and gas resources in this area. Since 5Ma, Zhuhai formation has been trapped with natural gas. At present, the reservoirs in Zhuhai Formation have been denser because of their deep burial depth. Adequate gas source, close source and reservoir, large pressure drop and smooth migration of oil and gas are the main controlling factors and geological conditions for the formation of the low permeability gas reservoir in Zhuhai Formation of Wenchang A depression.