石油勘探与开发2018，Vol.45Issue(1)：73-81,9.DOI:10.11698/PED.2018.01.07
低生烃强度区致密砂岩气形成机制——以鄂尔多斯盆地天环坳陷北段上古生界为例
Formation mechanism of tight sandstone gas in areas of low hydrocarbon generation intensity: A case study of the Upper Paleozoic in North Tianhuan depression in Ordos Basin, NW China
摘要
Abstract
As the Upper Paleozoic in the north part of Tianhuan depression in the Ordos Basin,NW China has lower hydrocarbon generation intensity and complex gas-water relationship,the main factors controlling the formation of tight sandstone gas and the distribution of tight sandstone gas in the low hydrocarbon generation intensity area are studied.Through two-dimensional physical simulation experiment of hydrocarbon accumulation,analysis of reservoir micro-pore-throat hydrocarbon system and dissection of typical gas reservoirs,the evaluation models of gas injection pressure,reservoir physical property,and gas generation threshold were established to determine the features of tight gas reservoirs in low hydrocarbon intensity area:(1) at the burial depth of less than 3 000 m,the hydrocarbon generation intensity of (7-10)× 108 m3/km2 is high enough to maintain effective charging;(2) tight sandstone in large scale occurrence is conducive to accumulation of tight gas;(3) differences in reservoir physical property control the distribution of gas pool,for the channel sandstone reservoirs,ones with better physical properties generally concentrate in the middle of sandstone zone and local structural highs;ones with poor physical properties have low gas content generally.Based on the dissection of the gas reservoir in the north Tianhuan depression,the formation of tight gas reservoirs in low hydrocarbon generating intensity area are characterized by "long term continuous charging under hydrocarbon generation pressure,gas accumulation in large scale tight sandstone,pool control by difference in reservoir physical property,and local sweet spot",and the tight gas pools are distributed in discontinuous "sheets" on the plane.This understanding has been proved by expanding exploration of tight sandstone gas in the north Tianhuan depression.关键词
鄂尔多斯盆地/天环坳陷/生烃强度/致密砂岩气/形成机制/分布规律Key words
Ordos Basin/Tianhuan depression/hydrocarbon generation intensity/tight sandstone gas/reservoir-forming mechanism/distribution pattern分类
能源科技引用本文复制引用
张福东,杨慎,邵丽艳,李君,魏国齐,刘新社,国建英,李剑,范志勇,佘源琦,关辉..低生烃强度区致密砂岩气形成机制——以鄂尔多斯盆地天环坳陷北段上古生界为例[J].石油勘探与开发,2018,45(1):73-81,9.基金项目
国家科技重大专项“大型油气田及煤层气开发”(2016ZX05047) （2016ZX05047）
