摘要
塔里木盆地库车坳陷北部构造带和克拉苏构造带处于同一区域构造背景,发育相似的石油地质条件,含气目的层系分别为侏罗系阿合组和白垩系巴什基奇克组,储层特征是造成勘探开发效果差异的重要因素。系统开展阿合组与巴什基奇克组储层特征对比,对2个构造带的勘探开发均具有重要启示意义。利用岩心、薄片和成像测井等资料,从储层沉积背景、储层基质与裂缝特征以及储层敏感性等角度出发,开展阿合组和巴什基奇克组的储层特征对比分析,并在此基础上得到了2点勘探开发启示。结果表明:构造样式是控制优质储层分布的重要因素,克拉苏构造带构造样式主要为逆冲推覆作用下形成的断背斜,背斜长轴为巴什基奇克组裂缝性储层的有利分布区,在此部署井位有较大概率获得高产;北部构造带构造样式复杂,多因素控制下的阿合组裂缝—孔隙型储层成因机制和优质储层预测还需开展深入研究。储层特征与流体环境是储层改造措施制定的重要依据,巴什基奇克组储层方解石胶结物含量高、地层流体为酸性、储层酸敏性弱、构造裂缝发育,可采用酸化和压裂并举的储层改造措施;阿合组储层方解石胶结物含量低、地层流体为碱性、储层具中等酸敏性、构造裂缝较发育,储层改造措施应以压裂为主。
The northern tectonic belt and Kelasu tectonic belt within the Kuqa Depression are in the same regional tectonic background,and have similar petroleum geology conditions.The target strata of the two tectonic belts are Lower Jurassic Ahe Formation(J1a)and Lower Cretaceous Bashijiqike Formation(K1bs),respectively,and reservoir characteristics are important factors that lead to differences of exploration and development effect.Systematically comparison between reservoir characteristics of J1a and K1bs has significant meaning to exploration and development of both tectonic belts.From the aspects of reservoir sedimentary background,reservoir matrix and fracture characteristics,and reservoir sensitivity using core,thin sections and image logging data,the comparison of reservoir features between J1a and K1bs and its mechanism were systematically carried out.And based on analyses above,some exploration and development enlightenment were obtained.The results show two conclusions.Firstly,structural style is an important factor that controls favorable reservoir distribution.The structural style of Kelasu tectonic belt is primarily faulted anticline formed by thrusting from Tianshan orogenic belt.The long axis of anticline is favorable area of the K1bs fractured reservoir,and therefore,wells that deployed here have high probability to get high gas production.The northern tectonic belt has complex structural styles,and thus the formation mechanism and favorable reservoir prediction of J1a fractured-porous reservoir that controlled by multi-factors need further research.Secondly,reservoir characteristics and formation fluid environment are important references for reservoir reformation measure.The K1bs has high calcite cement content,acidic formation fluid,weak reservoir sensitivity,and develops tectonic fractures.Therefore to the K1bs,the reservoir reformation should use both acidizing and fracturing.While the J1a has low calcite cement content,alkaline formation fluid,moderate reservoir sensitivity,and also develop tectonic fractures.Therefore,the reservoir reformation should give priority to fracturing.
作者
王珂
张荣虎
王俊鹏
余朝丰
杨钊
唐雁刚
WANG Ke;ZHANG Ronghu;WANG Junpeng;YU Chaofeng;YANG Zhao;TANG Yan′gang(PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;Tarim Basin Research Center,PetroChina Research Institute of Petroleum Exploration&Development,Korla 841000,China;Research Institute of Petroleum Exploration&Development,PetroChina Tarim Oilfield Company,Korla 841000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第4期556-571,共16页
Natural Gas Geoscience
基金
中国石油“十四五”前瞻性基础课题(编号:2021DJ0302)
国家重点研发计划(编号:2019YFC0605501)联合资助。
关键词
沉积相
储层裂缝
储层敏感性
构造样式
优质储层分布
储层改造措施
库车坳陷
Sedimentary facies
Reservoir fracture
Reservoir sensitivity
Structural style
Favorable reservoir distribution
Reservoir reformation measure
Kuqa Depression
