摘要
针对混积岩优质储集层成因复杂的难题,进行准噶尔盆地吉木萨尔凹陷二叠系芦草沟组混积岩孔喉系统、控制因素及流体可动性研究。结果表明,混积型储集层发育粒间孔喉系统(A型)、粒间-溶蚀-晶间混合孔喉系统(B型)、溶蚀孔喉系统(C型)、溶蚀-晶间混合孔喉系统(D型)和晶间孔喉系统(E型)5类。混积岩孔喉系统有3个主要主控因素:混积岩组分含量及排列方式、沉积环境和成岩作用。混积岩组分含量及排列方式控制孔喉系统类型及变化;沉积环境主要控制孔喉系统的宏观分布,近源、高能环境混积岩粗粒组分多,颗粒或互层型支撑,发育A型和B型孔喉;远源、中能环境混积岩过渡为云泥支撑,发育C型和D型孔喉;而远源、低能环境混积岩孔喉主要为E型和D型。压实和方解石胶结等成岩作用进一步破坏粒间、溶蚀孔喉占比。在砂泥混积时,孔喉系统类型为“A→B→C→D”变化,云砂混积时孔喉系统类型为“A→C→D→E”、或“B→D→E”变化,云泥混积时孔喉系统类型为“D→E”的变化,细节受偏砂粒、长石和白云石含量影响。其中,A型孔喉的物性及可动性最好,D型和E型最差;可动流体分布与支撑方式有关,云泥支撑型混积岩大孔可动优势不明显。研究成果为混积型储集层甜点评价及解释模型的合理构建提供了地质依据。图15表1参19。
Aiming at the complicated problem of the genesis of high-quality hybrid sedimentary rocks(HSR),the pore-throat systems(PTS),controlling factors and fluid mobility of HSR in the Permian Lucaogou Formation in Jimusar Sag were examined.The results show that the HSR contain 5 types of PTS,intergranular(Type A),mixed intergranular-dissolved-intercrystalline(Type B),dissolved(Type C),mixed dissolved-intercrystalline(Type D)and intercrystalline(Type E)ones.The PTS are controlled by 3 major factors,the component content and arrangement(CCA)of HSR,sedimentary environment and diagenesis.CCA controls the matrix support mode of HSR,and therefore controls the types and changes of PTS.The sedimentary environment mainly controls the macroscopic distribution of PTS,i.e.,HSR deposited in the near source and high-energy environment are characterized by high content of coarse-grained component,granular/interbedded-support mode,and development of Type A and Type B PTS.HSR deposited in the medium-energy environment far from source are characterized by dolomitic/mud support mode and Type C and Type D PTS.HSR deposited in low-energy environment far from source have mainly Type E and Type D PTS.Diagenetic processes such as compaction and calcite cementation make the proportions of Type A and Type C PTS decrease further.In the hybrid sedimentary process of sandy-mud,PTS types show a change of“A→B→C→D”,in that of dolomite-sand,PTS types show a change of“A→C→D→E”or“B→D→E”,and in that of dolomite-mud,PTS types show a change of“D→E”,which are affected in details by the contents of coarse-grain component,feldspar and dolomite.The reservoir with Type A pore-throats has the best physical properties and fluid mobility,and the reservoirs with Type D and Type E pore-throats have the poorest.The movable fluid distribution is related to the matrix support mode,and the larger pores in HSR of dolomite/mud support mode have no obvious advantage in fluid mobility.The findings of this study provide a geological basis for evaluating and building reasonable interpretation model of HSR sweet spot.
作者
肖佃师
高阳
彭寿昌
王猛
王民
卢双舫
XIAO Dianshi;GAO Yang;PENG Shouchang;WANG Meng;WANG Min;LU Shuangfang(Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Kelamayi 834000,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2021年第4期719-731,共13页
Petroleum Exploration and Development
基金
国家重点基础研究发展规划项目(2015CB250906)
国家自然科学基金(41972139,41922015)
中央高校基本科研业务费专项资金(18CX02069A)。
关键词
孔喉系统
孔喉类型演化
流体可动性
混积岩
二叠系芦草沟组
吉木萨尔凹陷
准噶尔盆地
pore throat system
pore throat types evolution
fluid mobility
hybrid sedimentary rock
Permian Lucaogou Formation
Jimusar Sag
Junggar Basin
