摘要
基于钻井、录井、测井、地质实验等基础资料,对河套盆地临河坳陷超深层碎屑岩油气地质特征及富集高产因素开展研究。研究表明:①临河坳陷古近系发育的内陆咸化湖相优质烃源岩具有早熟早排、高产烃率和持续高效生烃特征,为超高压高产油气藏形成奠定重要资源基础;②弱压实、早充注、弱胶结保孔,叠加超高压保孔扩缝增渗,使得6500 m以深的超深层依然发育孔隙度大于15%、渗透率达226×10^(−3)μm^(2)的中孔中渗型优质储集体,极大拓展了油气勘探空间;③临洼构造临河组砂地比偏低、储盖组合好,且上覆巨厚优质泥岩盖层,具备持续高效生烃增压并形成超高压油气藏的有利条件;④邻近临河组生烃中心、有良好构造背景且构造圈闭发育的地区是最有利勘探方向,主要包括兴隆断裂构造带和纳林湖断裂潜山带超深层领域。临河坳陷超深层油气勘探重大突破,揭示了该地区超深层碎屑岩良好的勘探潜力,同时对其他地区超深层碎屑岩油气勘探具有重要借鉴意义。
Based on drilling and logging data,as well as geological experiments,the geological characteristics and factors controlling high-yield and enrichment of hydrocarbons in ultra-deep clastic rocks in the Linhe Depression,Hetao Basin,are studied.The results are obtained in four aspects.First,the inland saline lacustrine high-quality source rocks developed in the Paleogene in the Linhe Depression have the characteristics of early maturity,early expulsion,high hydrocarbon yield,and continuous and efficient hydrocarbon generation,providing an important resource basis for the formation of ultra-high pressure and high-yield reservoirs.Second,the weak compaction,early charging,and weak cementation for pore-preserving,together with the ultra-high pressure for pore-preserving and fracture expansion to improve the permeability,leads to the development of high-quality reservoirs with medium porosity(greater than 15%)and medium permeability(up to 226×10^(−3)μm^(2))in the ultra-deep strata(deeper than 6500 m),which represents a greatly expanded space for oil and gas exploration.Third,the Linhe Formation adjacent to the trough exhibits a low net-to-gross(NTG)and good reservoir-caprock assemblage,and it is overlaid by very thick high-quality mudstone caprock,which are conducive to the continuous and efficient hydrocarbon generation and pressurization and the formation of ultra-high pressure oil and gas reservoirs.Fourth,the most favorable targets for ultra-deep exploration are the zones adjacent to the hydrocarbon generating center of the Paleogene Linhe Formation and with good tectonic setting and structural traps,mainly including the Xinglong faulted structural zone and the Nalinhu faulted buried-hill zone.The significant breakthrough of ultra-deep oil and gas exploration in the Linhe Depression reveals the good potential of ultra-deep clastic rocks in this area,and provides valuable reference for oil and gas exploration of ultra-deep clastic rocks in other areas.
作者
武玺
史原鹏
陈树光
武函
蔡军
淡伟宁
刘喜恒
王晓坤
张晰蒙
张建丽
WU Xi;SHI Yuanpeng;CHEN Shuguang;WU Han;CAI Jun;DAN Weining;LIU Xiheng;WANG Xiaokun;ZHANG Ximeng;ZHANG Jianli(PetroChina Huabei Oilfield Company,Renqiu 062552,China)
出处
《石油勘探与开发》
EI
CAS
CSCD
北大核心
2024年第5期962-971,共10页
Petroleum Exploration and Development
基金
中国石油天然气集团有限公司攻关性应用性科技专项“超深层碎屑岩大中型油气田形成条件与有利区评价”(2023ZZ14-01)。
关键词
河套盆地
临河坳陷
超深层
临河组
河探101井
富集因素
Hetao Basin
Linhe Depression
ultra-deep strata
Linhe Formation
Well Hetan101
enrichment factor
