摘要
四川盆地上三叠统须家河组,由于强烈的成岩作用,砂岩厚而致密,储层非均质性强,多类型天然气藏发育。其主要发育八种常规气藏与两种非常规气藏。其中岩性气藏、构造—岩性复合气藏等规模大,储量丰富,是重要气藏类型,主要发育于川中地区;水溶气藏也很发育,产量高,潜力大,广泛分布于川中—川西的平缓斜坡区与坳陷区,是四川盆地未来重要发展方向。须家河组天然气藏大多具有近源、高压、含凝析油、含水,分布广、规模大,气、水关系复杂等特点。由于不同地区的沉积、成岩、构造等方面的不同,其天然气成藏的主控因素差异较大。如川中地区主要控制因素是岩性,川西冲断带则主要是构造与裂缝,川北主要是裂缝与岩性。因此,储集体、构造与裂缝等是须家河组天然气聚集成藏的三大主控因素,这三大要素的有效组合也是天然气富集高产区形成的关键。
Because of the strong diagenesis,sandstone in Upper Triassic Xujiahe Formation is thick and tight,reservoir heterogeneity is very strong,various types of gas reservoirs are developed.Major developed eight conventional gas reservoirs and two unconventional gas reservoirs.The lithological gas reservoir,structure-lithological reservoir having large scale and abundant reserves,are important gas reservoirs and mainly developed in the Mid-Sichuan area;Water soluble gas reservoir with high yield and great potential is also developed,widely distributed in the gentle slope and the Depression in the central-west Sichuan region,is the important development direction in Sichuan Basin.The Xujiahe Formation gas reservoirs adjacent the source,have high pressure,contain condensate oil and water,distributed widely,and their scale is large and relationship between water and gas is complex.As different areas have different characters of deposition,diagenesis and structure,the main controlling factors in gas accumulation are quite different.Therefore,the distribution of reservoir,tectonic background and the degree of fracture development are the major three controlling factors of the gas accumulation in Xujiahe Formation gas reservoirs,the main control factor of accumulation and high productivity is the effective combination of the three elements.
出处
《沉积学报》
CAS
CSCD
北大核心
2010年第5期1037-1045,共9页
Acta Sedimentologica Sinica
关键词
四川盆地
上三叠统
须家河组
气藏类型
聚集规律
主控因素
Sichuan Basin
Upper Triassic
Xujiahe Formation
types of gas reservoirs
accumulation law
main control factor
作者简介
李伟男1963年出生高级工程师沉积学及石油地质E-mail：1we@petrochina．com．cn
