柴达木盆地东部水溶性天然气层分类及成藏主控因素研究
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摘要
水溶性天然气是一种非常规天然气,具有潜在的利用价值。根据气水比变化,利用测井资料和用含气泥质砂岩双孔隙度模型电导率关系表达式所推导的含气饱和度模型,定量处理含气饱和度后,结合对水溶性天然气层测试资料,综合分析了柴达木盆地三湖地区第四系水溶性天然气层的分类,初步将该区水溶性天然气层分为4类。通过静态法经济评价确定气水比大于20m3/m3的水溶性天然气层,在现有经济技术条件下具有经济价值;同时结合对钻录井资料以及地震资料的系统分析,指出气水比大于5m3/m3的高气水比水溶性天然气层的成藏除了受气源与储层条件控制外,主要受构造圈闭、缓坡带以及陡坡带的发育程度等地质条件的制约和影响。
Water-dissolved gas is a kind of unconventional gas.To further analyze the economic value of water-dissolved gas in the Quaternary of the Sanhu of Chaidamu Basin,the authors preliminarily study the classification of water-dissolved gas according to the change of gas/water ratio and after quantitatively processing the gas-bearing saturation using the gas-bearing saturation model derived by conductivity expression in a gas-bearing shaly sandstone dual porosity model along with referencing practical test results.Water-dissolved gas can be divided into four types.It is of economic value when,according to the static economic evaluation,the gas/water ratio is more than 20 m3/m3 under the present economic and technological conditions.The reservoir formation of water-dissolved gas with high GWR are controlled and influenced by structural trap,development degree of gentle slope belts,steep slope zone etc.
Water-dissolved gas is a kind of unconventional gas.To further analyze the economic value of water-dissolved gas in the Quaternary of the Sanhu of Chaidamu Basin,the authors preliminarily study the classification of water-dissolved gas according to the change of gas/water ratio and after quantitatively processing the gas-bearing saturation using the gas-bearing saturation model derived by conductivity expression in a gas-bearing shaly sandstone dual porosity model along with referencing practical test results.Water-dissolved gas can be divided into four types.It is of economic value when,according to the static economic evaluation,the gas/water ratio is more than 20 m3/m3 under the present economic and technological conditions.The reservoir formation of water-dissolved gas with high GWR are controlled and influenced by structural trap,development degree of gentle slope belts,steep slope zone etc.
引文
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[4]范连顺,等.柴达木盆地东部第四系生物气成藏条件与勘探目标选择.青海石油管理局“八五”国家重点科技攻关项目成果报告,1995
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[4]金之钧,张明利,汤良杰,等.柴达木中新生代盆地演化及其控油气作用[J].石油与天然气地质,2004,25(6):603-608.
[5]张一伟,党玉琪,熊继辉,等.柴达木盆地油气勘探论文集[M].北京:石油工业出版社,2004.
[6]党玉琪,张道伟,徐子远,等.柴达木盆地三湖地区第四系沉积相与生物气成藏[J].古地理学报,2004,6(1):110-119
[2]福田里.有关水溶性天然气藏的地质学意义.日本地质学会,1967
[3]彭德华.柴达木盆地油气资源评价.青海油田分公司内部报告,2002.
[4]范连顺,等.柴达木盆地东部第四系生物气成藏条件与勘探目标选择.青海石油管理局“八五”国家重点科技攻关项目成果报告,1995
[1]杨申镳,张肖兰.水溶性天然气勘探与开发[M].北京:石油大学出版社,1996.
[2]张子枢.水溶气浅论[J].天然气地球科学,1995,6(5):29-34.
[3]武晓春,庞雄奇,于兴河,等.水溶气资源富集的主控因素及其评价方法探讨[J].天然气地球科学,2003,14(6):416-421.
[4]金之钧,张明利,汤良杰,等.柴达木中新生代盆地演化及其控油气作用[J].石油与天然气地质,2004,25(6):603-608.
[5]张一伟,党玉琪,熊继辉,等.柴达木盆地油气勘探论文集[M].北京:石油工业出版社,2004.
[6]党玉琪,张道伟,徐子远,等.柴达木盆地三湖地区第四系沉积相与生物气成藏[J].古地理学报,2004,6(1):110-119
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