松辽盆地昌德地区营城组火成岩气藏储层特征及其控制因素  

Characteristics and Controlling Factors of the Yingcheng Formation Volcanic Reservoir in the Changde Area,Songliao Basin

作　　者：谢庆宾[1,2] 高霞[3] 夏秋君[4] 舒萍[5] 杨双玲[5] 徐岩[5] 李娜[2] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油勘探开发研究院,北京100083 [4]中国石油冀东油田分公司,河北唐山063000 [5]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地质学报》2012年第8期1217-1226,共10页Acta Geologica Sinica

基　　金：国家重点基础研究发展计划(973计划)(编号:2009CB219307)火山岩油气藏的形成机制与分布规律项目资助的成果

摘　　要：松辽盆地昌德地区火山岩储层以酸性岩为主,主要岩石类型为熔结凝灰岩和凝灰岩,与国内其他含油气盆地的火山岩储层明显不同。宏观上岩性较致密,岩心观察仅见构造裂缝和溶蚀孔,局部见溶蚀洞,显微镜下观察储集空间类型多样,发育粒内溶孔、晶内熔孔、晶间微孔、构造微裂缝、炸裂缝和收缩缝等。火山岩厚度普遍较薄,其中芳深9井区火山岩厚度最大,最厚仅为75m。从岩相类型看,芳深9井附近为爆发相,其他地区为溢流相。研究区火山岩为低孔低渗储层,岩性和岩相与物性关系密切,同时控制着原生孔隙的形成。后期的成岩改造,包括构造活动、溶蚀作用等决定了次生孔隙的发育程度,构造运动产生的裂缝是该区储层得以改善的主要因素,而后期充填作用破坏了储层的储集性能。火山口附近爆发相与溢流相的叠合区是天然气勘探的有利目标。The volcanic reservoir in the Changde area in Songliao Basin consist of ignimbrite and tuff, most of which belong to acidic volcanic rock, and is very different from other volcanic reservoirs of oil and gas basin in China. The rock is generally compact in structure and texture. Structure cracks and corrosion caves can be observed in drilling cores, with dissolved holes seen locally. Various types of reservoir space can be found under microscope, including intragranular dissolved pores, intra--crystal pores, structural micro-cracks, cracks and contraction joints and others. The volcanic rocks are generally thin, with about 75 m of the biggest thickness in the volcanic rock of Fangshen 9 well. In addition, the Fangshen 9 well shows an explosive facies, while other places show effusion facies. Volcanic rocks in the study area are low --porosity, low--permeability reservoir, and its lithology and lithofacies are closely related to physical properties and control the formation of the primary porosity. Late diagenetic reformation, including tectonic activities and dissolution determines the degree of development of secondary pores. Fractures produced by tectonic movement are the important factor to improve reservoir quality, while the late filling destroys the capability of reservoir and accumulation. The superimposing areas between eruption and effusion facies near volcanic crater are the favorable target for gas exploration.

关 键 词：松辽盆地 昌德地区 营城组 火山岩储层 储集性 

分 类 号：P618.13[天文地球—矿床学]