金湖凹陷戴南组成岩相定量表征与孔隙演化模式  

Quantitative Characterization of Digenetic Facies and Mode of Pore Evolution of Dainan Formation in Jinhu Depression

作　　者：汪孝敬[1] 李维锋[1] 袁晓光[1] 刘海[1] 李大飞[1] 

机构地区：[1]长江大学油气资源与勘察技术教育部重点实验室地球科学学院,武汉430100

出　　处：《科学技术与工程》2014年第29期143-150,共8页Science Technology and Engineering

摘　　要：通过分析X衍射、扫描电镜、古地温、生烃史、分析化验等测试资料,对金湖凹陷戴南组储层特征、成岩相及孔隙演化模式做了详细研究.研究表明：研究区古近系戴南组岩石类型为长石岩屑质石英砂岩,其成熟度中等;在分析成岩作用成因的基础上,通过计算成岩强度（主要包括压实强度、胶结强度、溶蚀强度）划分为9种成岩相：Ⅰ弱压实强胶结溶蚀相、Ⅱ弱压实强胶结中等溶蚀相、Ⅲ中等压实强胶结中等溶蚀相、Ⅳ中等压实强胶结强溶蚀相、Ⅴ弱压实弱胶结强溶蚀相、Ⅵ弱压实强胶结弱溶蚀相、Ⅶ强压实强胶结中等溶蚀相、Ⅷ强压实弱胶结强溶蚀相、Ⅸ强压强胶结弱溶蚀相.结合孔隙演化特征机理、成岩阶段以及成岩相的演化关系研究,1 000～1 500m对应的早成岩B期主要为混合孔隙发育带,发育有Ⅰ、Ⅴ、Ⅵ类岩石相,1500 m以下对应的中成岩A期主要为次生孔隙发育带,主要发育有Ⅱ、Ⅲ、Ⅳ、Ⅶ、Ⅸ类岩石相,其次为Ⅵ、Ⅶ类岩石相.成岩阶段、成岩相、沉积相以及油气的上排效率及其多期次性在很大程度上决定了该区储层物性垂向的分带性;通过成岩阶段以及成岩相并结合孔隙演化曲线,认为戴南组从下至上储层物性有变好的趋势,西部、中部及东南地区储层明显优于南部地区.Based on the analysis of X-ray diffraction,scanning electron microscope,paleotemperature,laboratory analysis and other comprehensive material,the characteristics of reservoirs,digenetic facies and mode of pore evolution of Jinhu depression were studied in detail.The result shows that feldspar-lithic quartz sandstone is the main sandstone type,with medium maturity;based on the analysis of the cause of diagenesis and calculating diagenetic strength（includes compaction strength,the strength of cementation,dissolution intensity,mainly）,this area is divided into 9 types of digenetic facies by comprehensive analysis of the above information,namely,Ⅰ weak compaction with strong cementation and strong dissolution facies,Ⅱ weak compaction with weak cementation and medium dissolution facies,Ⅲ weak compaction with strong cementation and weak dissolution facies,Ⅳ medium compaction with strong cementation and strong dissolution facies,Ⅴ weak compaction with weak cementation and strong dissolution facies,Ⅵ weak compaction with strong cementation and weak dissolution facies,Ⅶ strong compaction with strong cementation and medium dissolution facies,Ⅷ strong compaction with weak cementation and strong dissolution facies,X strong compaction with strong cementation and weak dissolution facies.Studying about the relation between characteristics of porosity evolution mechanism,diagenetic stages and diagenetic facies,it reveals that（1 000 ～ 1 500） m corresponding syndiagenesis B period mainly developed mixed pore zone and Ⅰ、Ⅴ、Ⅵ types of digenetic facies; below 1 500 m corresponding middle diagenetic a period mainly developed secondary pore zone and Ⅵ、Ⅵ、Ⅶ types of digenetic facies.Diagenetic stages,digenetic facies,sedimentary facies,Upward and the multi-stage hydrocarbon expulsion were decided the reservoir property in vertical zoning.Through porosity evolution curve analysis,horizontally,reservoir physical property is also changing in a good trend; the western,central and southeast reservo

关 键 词：成岩相 定量表征 孔隙演化模式 戴南组 金湖凹陷 

分 类 号：TE121.13[石油与天然气工程—油气勘探]