摘要
英台断陷营二段沉火山碎屑岩致密气藏资源勘探潜力大,但是成藏规律较为模糊。基于气样和岩样的轻烃指纹分析致密气的气源及运聚特征,剖析气源岩品质及致密储层岩性、物性特征,阐明二者对气藏的形成、分布和富集的控制作用,并从影响单井产能的地质因素出发,分析制约单井产能的主导因素。研究表明,英台断陷营二段致密气轻烃指纹与该层段烃源岩具有良好的亲缘关系,揭示其"原地生成、就近聚集"的成藏特征。高丰度、偏腐泥型有机质确保了充足的气源,粒间/粒内溶孔为气藏的聚集提供了储集空间,源储交互沉积模式成为气藏的有利保存条件,目前揭示的工业气流井基本分布在生气强度大于25×10^(8)m^(3)/km^(2)、孔渗大于4%和0.02×10^(-3)μm^(2)的源储范围内。虽然源储品质及其耦合关系控制着气藏的富集和分布,但单井产能与射孔层段平均渗透率的正相关性更为显著。因此,构造应力强、天然裂缝发育的五棵树地区是英台断陷营二段沉火山碎屑岩气藏勘探开发的首选目标。
Tight gas reservoirs with sedimentary pyroclastic rocks has great potential in Yingcheng 2th member of Yingtai Fault Depression,but accumulation pattern is not clear at present.The light hydrocarbon fingerprints of gas and rock samples were analyzed to know the gas source and migration characteristics of the tight gas.The quality of gas source rocks and lithology,physical properties of the tight reservoirs were studied,which play a role in controlling the formation,distribution and enrichment of the gas reservoirs.The major controlling factors of the single well productivity were analyzed beginning from the geological factors.The results show that the light hydrocarbon fingerprints of the tight gas in Yingcheng 2th member are closely related to the source rocks,which reveal the accumulation characteristics of"in-situ generation and nearby accumulation".High-abundant and sapropel-type organic matter ensures an adequate gas source,intergranular/intragranular solution pores provide storage space for gas accumulation,and source-reservoir interaction deposition model is a favorable preservation condition for the gas reservoir.At present,industrial gas wells mainly distribute in the source-reservoir areas with gas generation intensity greater than 25×10^(8)m^(3)/km^(2),and porosity and permeability greater than 4%and 0.02×10^(-3)μm^(2).Although the quality of the source and reservoir and their coupling relationship control the accumulation and distribution of the gas reservoirs,the positive correlation between single well productivity and average permeability of perforated interval is more significant.Therefore,Wukeshu area with strong tectonic stress and developed natural fractures is the preferred target for exploration and development of the sedimentary pyroclastic gas reservoirs in Yingtai Fault Depression.
作者
逯瑞敬
Lu Ruijing(Exploration and Development Research Institute of Daqing Oilfield Co.,Ltd.,Daqing Heilongjiang 163412;Heilongjiang Provincial Key Laboratory of Terrestrial Shale Oil,Daqing Heilongjiang 163412)
出处
《中外能源》
CAS
2021年第10期53-63,共11页
Sino-Global Energy
关键词
沉火山碎屑岩
致密气
优质源岩
有效储层
成藏规律
sedimentary pyroclastic rock
tight gas
high-quality source rocks
effective reservoir
accumulation pattern
