库车坳陷DB气田白垩系巴什基奇克组砂岩的多期溶蚀
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  • 英文篇名:Multi-staged dissolution of sandstone in Cretaceous Bashijiqike Formation in DB gas field of Kuqa Depression,Tarim Basin
  • 作者:袁静 ; 成荣红 ; 朱忠谦 ; 杨学君 ; 袁凌荣 ; 李春堂
  • 英文作者:Yuan Jing;Cheng Ronghong;Zhu Zhongqian;Yang Xuejun;Yuan Lingrong;Li Chuntang;School of Geosciences,China University of Petroleum;Petro China Tarim Oilfield Company;CNOOC Zhanjiang Branch;SINOPEC North China Company;
  • 关键词:多期溶蚀 ; 砂岩 ; 巴什基奇克组 ; 白垩系 ; 气田 ; 库车坳陷
  • 英文关键词:multi-stage dissolution;;sandstone;;Bashijiqike Formation;;Cretaceous;;gas field;;Kuqa Depression
  • 中文刊名:SYYT
  • 英文刊名:Oil & Gas Geology
  • 机构:中国石油大学地球科学与技术学院;中国石油塔里木油田分公司;中海石油(中国)有限公司湛江分公司;中国石化华北油气分公司;
  • 出版日期:2016-08-28
  • 出版单位:石油与天然气地质
  • 年:2016
  • 期:v.37
  • 基金:国家科技重大专项(2011ZX05003-04);; 中国石油科技重大专项(2010E-2103)
  • 语种:中文;
  • 页:SYYT201604012
  • 页数:10
  • CN:04
  • ISSN:11-4820/TE
  • 分类号:94-103
摘要
以岩心观察、普通薄片和铸体薄片观察与鉴定为基础,辅以阴极发光显微镜、扫描电镜和油层物性分析等技术手段,结合区域地质研究成果,系统研究塔里木盆地库车坳陷DB气田白垩系巴什基奇克组砂岩储层溶蚀作用特征及其发育机制,并剖析其与孔隙演化的关系。结果表明,库车坳陷DB气田白垩系巴什基奇克组砂岩为特低孔-特低渗储层,发育多种溶蚀孔隙。储层经历多期溶蚀作用,依次为大气淡水表生淋滤溶蚀作用、有机酸溶蚀作用、微弱的碱性溶解作用和较弱的酸碱交替溶蚀作用,分别溶蚀早期碳酸盐胶结物、长石、不稳定岩屑和石英质组分等,形成粒间溶孔、溶蚀缝、超粒大孔隙、粒内溶孔等溶蚀孔隙。结合地层埋藏史、有机质发育史和构造演化史等研究成果,综合分析认为,DB气田多期溶蚀和烃类多期注入相匹配是形成现今高产气田的重要原因。
        Characteristics and genesis of dissolution and its influence over pores in sandstone reservoirs of the Cretaceous Bashijiqike Formation in DB gas field of Kuqa Depression are studied based on observation of cores,and normal / cast thin sections,analyses through cathodoluminescence microscope,scan electricity microscope,and characterization of reservoir physical properties,and etc.The result shows that the sandstone reservoirs in the Formation have ultra-low porosity and permeability and contain various types of dissolved pores.The reservoirs had experienced successively atmospheric water supergene leaching(dissolving carbonate cementation),organic acid dissolution(dissolving feldspar),weak alkaline dissolution(dissolving unstable debris),and less weak alternative acid / alkali dissolution(dissolving quartzose),resulting in intergrannular dissolution pores,dissolution fractures,large dissolution pores surpassing grain size,intragranular dissolution pores,and etc.A combination of the study with previous analyses,including stratigraphic burial history,and evolutionary history of organic matter and tectonics of the Formation,indicates that right timing between multi-staged dissolution and hydrocarbon charge was critical for forming prolific DB field.
引文
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