摘要
准噶尔盆地西北缘中佳地区佳木河组二段一砂组致密砾岩储层厚度大,分布范围广,试油气结果不理想,储层“甜点”区分布规律不清。基于录测井、分析化验以及叠前三维地震等多种资料,建立地质“甜点”与工程“甜点”判别参数,揭示“甜点”特征与采气能力相关关系,优选“甜点”表征参数,进行储层“甜点”预测及评价。研究结果表明:中佳地区佳木河组二段一砂组储层为低孔隙度、特低渗透率的致密砾岩储层,渗流条件整体偏差。致密砾岩储层脆性指数普遍大于60%,储层可压性好,更容易获得高产。“甜点”区储层具有低伽马值、高电阻率、低密度、低中子孔隙度、高声波时差值、较高孔渗,高含气饱和度,低纵横波速度比、低波阻抗以及脆性指数值较高的特征。依据储层综合评价分类特征结合纵横波速度比、孔隙度及脆性指数参数反演结果识别刻画2类“甜点”区分布范围,其中Ⅰ类“甜点”区分布在扇三角洲内前缘相带中的中佳7—新光1井区,总面积达50 km^(2);Ⅱ类“甜点”区主要分布于中佳7—新光1井区外围区,面积达48 km^(2)。部署在Ⅰ类“甜点”区的ZJHW201井获得日产70×10^(4) m^(3)高产气流,推动了准噶尔盆地二叠系厚层致密砾岩气藏的勘探开发,对进一步助推新疆油田天然气业务加快发展具有重要意义。
The tight conglomerate reservoir of the first sand group of the second member of Jiamuhe Formation in the Zhongjia area of the northwest margin of the Junggar Basin had a large thickness and wide distribution.The test results of oil and gas were not satisfactory,and the distribution pattern of reservoir “sweet spot”area was unclear. Based on logging,analysis and assay,and pre-stack 3D seismic data, the discriminatory parameters of geological“sweet spot”and engineering“sweet spot” were established. The relationship between “sweet spot” characteristics and gas recovery capacity was revealed,and the“sweet spot”characterization parameters were selected for reservoir “sweet spot” prediction and evaluation.The results showed that the reservoir was a tight conglomerate reservoir with low porosity and exceptionally low permeability of the first sand group of the second member of Jiamuhe Formation in the Zhongjia area,and the seepage conditions were deviated overall. The reservoir brittleness characteristic index was generally greater than 60%,“sweet spots” were identified by combining longitudinal and transverse wave velocity reflecting better reservoir compressibility and more likely to obtain high production.The “sweet spot” reservoir had low gamma,high resistivity,low density,low neutron porosity, high acoustic time difference,high pore permeability,high gas saturation,low longitudinal to transverse velocity ratio, low wave impedance, and high brittleness index value. Based on the comprehensive evaluation of reservoir classification characteristics combined with the inversion results of longitudinal and transverse wave velocity ratio, porosity and brittleness index parameters, the distribution range of the two types of “sweet spot” areas were identified and characterized.The Type I “sweet spot” was located in the Zhongjia 7-Xinguang 1 well area in the fan delta’s inner frontal phase zone,with a total area of 50 km^(2);the Type II “sweet spot”was mainly located in the peripheral area of the Zhongjia 7-Xinguang 1 well area,with an area of 48 km^(2).The Well ZJHW201, deployed in the Class I “sweet spot” area, obtained 700 000 m^(3) of high production gas flow, which promoted the exploration and development of thick Permian tight conglomerate gas reservoirs in the Junggar Basin, and was of great significance to further promote the accelerated development of natural gas business in Xinjiang Oilfield Company.
作者
杨川
李啸
吴涛
宋明星
刘念周
贾开富
董桂彤
费李莹
YANG Chuan;LI Xiao;WU Tao;SONG Mingxing;LIU Nianzhou;JIA Kaifu;DONG Guitong;FEI Liying(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2023年第2期253-270,共18页
Natural Gas Geoscience
基金
国家科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”(编号:2017ZX05001-004)
中国石油重大科技专项“复杂气藏有效开发及稳产关键技术研究与应用”(编号:2017E-0410)
中国石油“十四五”前瞻性基础性技术攻关项目“岩性地层油气藏成藏规律与关键技术研究”(编号:2021DJ0405)联合资助.
关键词
“甜点”预测
致密砾岩储层
佳木河组二段一砂组
中佳地区
准噶尔盆地
“Sweet spot” prediction
Tight conglomerate reservoir
The first sand group of the second member of Jiamuhe Formation
Zhongjia area
Junggar Basin
作者简介
杨川(1993-),男,重庆长寿人,硕士,工程师,主要从事油气综合地质研究.E-mail:yangchauan1993@163.com;通信作者:吴涛(1981-),男,新疆奎屯人,博士,高级工程师,主要从事储层沉积学与油气地质综合研究.E-mail:wutao33@petrochina.com.cn.
