摘要
长岭断陷火山岩十分发育,是重要的天然气储集体。长岭断陷查干花地区火山岩主要分布于下白垩统营城组,以中酸性火山喷发岩为主,其主要储气岩为流纹岩和凝灰岩。流纹岩的储集空间以气孔、溶孔和构造裂缝为主;凝灰岩储集空间以溶蚀孔隙和构造裂缝为主。深大断裂控制了火山岩的空间分布,火山机构和相带控制火山岩储层的分布,而构造作用、风化淋滤作用和溶蚀作用控制有效储层的形成。储层的发育程度与火山岩相和火山口(源)的位置密切相关,一般在火山口、近火山口的爆发相热碎屑流亚相和溢流相顶部—上部亚相的火山岩储集性能最好;构造活动及火山喷发可产生大量次生裂缝,提高了火山岩的储集性能;风化淋滤和溶蚀作用产生大量的次生孔隙,使储集性能得到有效改善。
Volcanic rocks of Chaganhua area in Changling depression have been found mainly in Yingcheng formation of lower Cretaceous,most of them belong to middle-acidic extrusive volcanic,and the gas reservoir rocks are mainly rhyolite and tuff.The reservoir space of the rhyolite is mainly pore,dissolution pores,fracture;and the reservoir space of the tuff is mainly dissolution pore and fracture.The spatial distribution of volcanic rock is controlled by deep fracture,and the distribution of volcanic reservoirs is associated with the volcanic structure and facies,while the effective reservoir space is mainly formed by tectonic activities,weathering and leaching processes and denudation.It is considered that,the reservoir development was closely related to the volcanic facies and the location of volcanic rrater.The favorable reservoirs usually distribute in the pyroclaslic-bearing lava flow sub-facies of eruptive facies and top-upper subfacies of the effusive facies near volcanic crater.There are lots of secondary fractures in volcanic rocks due to tecton-ic activity and volcanic eruption,which would enhance the reservoir storage capacity.Weathering and leaching processes and denu-dation could cause large amount of secondary pores,which would improve the reservoir capacity effectively.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第6期39-42,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化科技部项目"松辽盆地南部断陷层勘探目标与技术研究"(P06022)
关键词
火山岩
储集特征
影响因素
风化淋滤作用
溶蚀作用
查干花地区
volcanic rocks
reservoir property
influence factor
erosion and leaching
dissolution
Chahuagan area
