石油勘探与开发2018，Vol.45Issue(1)：14-26,13.DOI:10.11698/PED.2018.01.02
四川盆地元坝气田发现与理论技术
Discovery and theoretical and technical innovations of Yuanba gas field in Sichuan Basin, SW China
摘要
Abstract
To solve the difficulties in exploration and development in Yuanba Great Ultra-deep Gas Feild in Sichuan Basin,SW China,the article studies the mechanism of development of quality reef reservoirs gas accumulation and innovates techniques for ultra-deep seismic exploration,drilling,completion and testing.Through the dynamic depositional evolution process of homoclinal ramp-fringed platform and reconstruction of regional depositional framework in the Permian,it is found that the reservoirs in the Changxing Formation of Yuanba area,Sichuan Basin are developed in a pattern of "early shoal and late reef,multiple stage stacking,in rows and belts",dissolution in early exposure stage and dolomitization during shallow burial give rise to the pores in matrix,overpressure caused by cracking of liquid hydrocarbon during deep burial induces fractures,and coupling of pores and fractures controls the development of ultra-deep high quality reservoirs.From correlation of oil and source rock,it is concluded that the Wujiaping Formation and Dalong Formation of deep-water continental shelf are the major source rocks in the Permian of northern Sichuan Basin.The hydrocarbon accumulation mode in ultra-deep formations of low-deformation zones is characterized by "three-micro migration,near-source enrichment,and persistent preservation".Through seismic inversion using the pore structure parameters of pore-fracture dual structure model,the high production gas enrichment area in Yuanba gas field is 98.5 km2.Moreover,special well structure and unconventional well structure were used to deal with multiple pressure systems and sealing of complex formations.A kind of integral,high pressure resistant FF-level gas wellhead and ground safety linkage device was developed to accomplish safe and environmentally friendly gas production.关键词
四川盆地/元坝气田/超深层/长兴组/生物礁/地震勘探/测试技术Key words
Sichuan Basin/Yuanba gas field/ultra-deep formation/Changxing Formation/reef/seismic exploration/testing technology分类
能源科技引用本文复制引用
郭旭升,胡东风,李宇平,段金宝,季春辉,段华..四川盆地元坝气田发现与理论技术[J].石油勘探与开发,2018,45(1):14-26,13.基金项目
国家自然科学基金“四川盆地二叠系—三叠系白云岩储层差异演化与油气差异富集机理”(U1663210) （U1663210）
