长岭断陷腰英台地区营城组火山岩成藏主控因素分析

Analysis of Major Control Factors of Yingcheng Formation Volcanic Reservoir in Yaoyingtai Area of Changling Depression

腰英台地区火山岩气藏具有储量规模大、丰度高、气层厚度大、储集物性好、单井产量高的特点,是深层天然气勘探的主要领域。研究区天然气藏围绕主力生烃中心呈带状分布,具体部位受古隆起和火山岩储层的控制。通过天然气成藏条件与天然气分布关系研究,认为研究区天然气分布主要受沙河子组源岩分布,火山岩岩性、岩相、物性和输导体系的共同控制,紧邻查干花次洼发育的营城组厚层、块状火山岩体是近期烃类气藏勘探的有利目标。

The volcanic gas reservoir in Yaoyingtai Area had several traits such as bigger reserves, higher abundance,higher thickness,better physical properties and higher per well production, it was the main area for exploration and development of natural gas resource. These gas reservoirs were distributed around the hydrocarbon center and controlled by palaeohigh and volcanic reservoir. By analysis on the relationship between conditions of hydrocarbon and its distribution, it was considered that the gas distribution was controlled by the distribution of the source rocks in Shahezi Formation, lithology, lithofacies, physical property and transforming system. Thick and massive rocks of Yingcheng Formation around the Chaganhua Sag are the beneficial targets of the gas exploration.