准噶尔盆地东北部石炭系碎屑岩天然气成藏条件及勘探方向  

Natural gas accumulation conditions and exploration directions of Carboniferous clastic rocks in the northeastern margin of Junggar Basin

作　　者：卫延召[1] 阿布力米提·依明[2] 吴卫安[1] 吴爱成[2] 杨帆[1] 刘超威 王泽胜[2] 周伯玉 Yanzhao WEI;Yiming ABULIMITI;Weian WU;Aicheng WU;Fan YANG;Chaowei LIU;Zesheng WANG;Boyu ZHOU(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Research Institute of Petroleum Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《天然气地球科学》2024年第5期810-822,共13页Natural Gas Geoscience

基　　金：中国石油“十四五”前瞻性基础性重大科技项目(编号:2021DJ0404);中国石油勘探开发研究院科研项目(编号:RIPED-2022-JS-2288,RIPED-2023-JS-1941)联合资助。

摘　　要：准噶尔盆地东北部石炭系是该盆地天然气重要勘探领域,但长期以来火山岩被作为主要勘探对象,而忽视了源储共生的碎屑岩勘探和研究,造成对石炭系碎屑岩成藏条件及勘探潜力认识不足。通过对东北部石炭系烃源岩评价、有效源灶刻画、碎屑岩储层评价、油气源对比及成藏模式构建等,取得了3点认识:(1)东北部石炭系发育滴水泉组、松喀尔苏组B段、石钱滩组3套优质气源岩,主要存在三南凹陷—滴水泉凹陷、五彩湾凹陷—大井地区、东道海子凹陷—白家海凸起3个烃源中心;(2)东北部石炭系发育砂砾岩、砂岩、浊积岩、云质岩、页岩等多类型规模储集体,总体属于低孔低渗—超低孔超低渗储层,2 900~4 500 m深度段存在溶蚀孔隙发育带;(3)油气源对比揭示3套气源岩对东北部天然气均有贡献,近源成藏特征明显,石炭系碎屑岩存在源内非常规和近源常规2类天然气藏,预测存在页岩气、致密砂岩气、常规天然气藏有序聚集的成藏模式。研究认识揭示盆地东北部石炭系碎屑岩源储配置条件优越,源内、近源碎屑岩天然气藏是该区重要勘探方向。The Carboniferous in the northeast of the Junggar Basin is an important exploration field of natural gas in the basin.However,volcanic rocks have been the main exploration objects for a long time,while the exploration and research of clastic rocks associated with source have been ignored,resulting in insufficient understanding of the reservoir forming conditions and exploration potential of Carboniferous clastic rocks.This study has obtained three understandings through the evaluation of Carboniferous source rocks,effective source stove characterization,clastic reservoir evaluation,oil and gas source correlation,and reservoir formation model construction in the northeast.Firstly,the Carboniferous in the northeast has developed three sets of high-quality gas source rocks:The Dishuiquan Formation,the B Member of Songkalsu Formation,and the Shiqiantan Formation.There are mainly three hydrocarbon source centers:The Sannan-Dishuiquan Depression,the Wucaiwan Depression-Dajing area,and the Dongdao Haizi Depression-Baijiahai Uplift.Secondly,the Carboniferous system in the northeast has developed multiple types of large-scale reservoirs,including sand conglomerates,sandstones,turbidites,dolomitic rocks,and shale.Overall,it belongs to low porosity,low permeability to ultra-low porosity,and ultra-low permeability reservoirs.There is a dissolution pore development zone in the depth range of 2900-4500 meters.Thirdly,the comparison of oil and gas sources reveals that all three sets of gas source rocks contribute to natural gas in the northeast,with obvious characteristics of near source reservoir formation.The Carboniferous clastic rocks have two types of natural gas reservoirs:unconventional and conventional near source.It is predicted that there is an orderly accumulation pattern of shale gas,tight sandstone gas,and conventional natural reservoirs.The research reveals that the Carboniferous clastic rock source and reservoir configuration in the northeast of the basin is superior,and the natural gas reservoirs in the source a

关 键 词：准噶尔盆地 东北部 石炭系天然气 碎屑岩储集体 源储共生 

分 类 号：TE122.2[石油与天然气工程—油气勘探]