松辽盆地深层火山岩储层岩相特征和天然气的来源  

Characteristics of volcanic facies and genesis of natural gases in deep Songliao Basin,NE China

作　　者：王璞珺[1] 侯启军[2] 刘万洙[1] 黄玉龙[1] 贾军涛[1] 唐华风[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]中国石油吉林油田分公司,吉林松原138001

出　　处：《世界地质》2007年第3期319-325,共7页World Geology

基　　金：国家自然科学基金项目(4037206);高等学校博士学科点专项科研基金资助(20030183042)联合资助

摘　　要：松辽盆地发育上下两个盆地充填序列:下部充填序列指埋深>3 000 m的上侏罗统—下白垩统断陷期火山成因地层,自下而上划分为火石岭组、沙河子组和营城组;上部充填序列由下白垩统上部—上白垩统坳陷期正常的沉积地层组成。下部充填序列的营城组火山岩是松辽盆地北部深层天然气的主要储集层(占储层的87%)。火山岩储层物性受控于火山岩岩相,喷溢相上部亚相(Ⅲ3)和侵出相。内带亚相(Ⅳ1)是最有利的火山岩储层,火山通道相火山颈亚相(Ⅰ1)、隐爆角砾岩亚相(Ⅰ3)和爆发相热碎屑流亚相(Ⅱ3))也是较好的储层。在松辽盆地北部徐家围子断陷火山岩储层中发现的工业气藏天然气有烃类、CO2、N2、H2S和少量稀有气体。通过天然气组成,烃类和CO2碳同位素组成分析,认识到徐家围子断陷火山岩气藏天然气主要为煤型气、油型气和无机气构成的混合气,无机成因CO2气可能源于地幔或是岩浆成因。The .Songliao Basin is composed of two basin filling episodes. The lower part, generally being buried more than 3 000 m beneath the surface, consists of Late Jurassic and Early Cretaceous volcanogenic successions including Huoshiling Formation （J3h）, Shahezi Formation （ K1 sh） and Yingcheng Formation （K1y） which were formed in the block-faulting stage. The upper part is made up of normal sedimentary sequence of Albian to Maastrichtian stages, which was formed in the sagging episode of the basin evolution. The volcanic rocks of Yingcheng Formation contribute 87 % of the reservoirs for the deep basin gases. Porosity and permeability of the reservoir volcanic rocks are facies-controlled. The best volcanic reservoirs are commonly found among those subfacies including diatreme （ Ⅰ1 ）, crypto-explosive breccia （ Ⅰ 3）, pyroclastic bearing lava flow （Ⅱ3）, upper effusive （ Ⅲ3） and inner extrusive ones （ Ⅳ1 ）, with the latter two ones being the best. Commercial gases found in the volcanic reservoirs there include hydrocarbon, CO2, N2, H2 S and some noble gases. Multi-sources for those gases are concluded, i.e. a mixture of gases from coal, mudstone, and abiogenic origin gases which may be mantle/magma-derived, based on composition of the natural gases trapped, the C/H isotopes of the hydrocarbon and CO2.

关 键 词：松辽盆地 火山岩储层 火山岩相 天然气 

分 类 号：P618.130.1[天文地球—矿床学]