冯冲,王清斌,杨波,朱文森,赵国祥
FEGN Chong,WANG Qingbin,YANG Bo,ZHU Wensen,ZHAO Guoxiang

• 1:中海石油(中国)有限公司天津分公司

摘要(Abstract)：

综合利用薄片、扫描电镜、X衍射、阴极发光、物性等资料,对锦州20-A构造沙河街组二段储层的岩石学特征、成岩作用、超压成因、次生孔隙成因等进行了研究。结果表明:锦州20-A构造沙二段砂岩岩石类型主要为长石砂岩、岩屑质长石砂岩,可溶组分含量较高;成岩作用主要有压实作用、胶结作用、交代作用和溶蚀作用,以早期碳酸盐胶结和后期溶解为典型特征,成岩演化处于中成岩A期,较研究区整体成岩演化滞后;沙二段地层压力连线与静水压力线平行,且压力系数随深度减小,为连通传递超压,超压封存箱内碳酸盐胶结物的溶蚀再分配以及超压对黏土矿物转化的抑制是深部高孔带形成的主要控制因素。
Comprehensively utilizing the data of cast thin section,scanning electron micrograph(SEM),X-ray diffraction,cathodoluminescence/cathodeluminescence and physical properties,the petrological characteristics,diagenesis,overpressure and secondary pore geneses and so on are figured out for Member 2 reservoir of Shahejie Formation(E_2s_2) in Structure Jinzhou 20-A.The results show that the sandstone types are mainly feldspathic sandstone and lithic-feldspar sandstone,which have abundant content of preferring solution;the diageneses main refer to compaction,cementation,metasomatism and dissolution,which are typically characterized by early-stage carbonate cementation and later dissolution,the diagenetic evolution is within middle-A stage,which is lagging behind comparing the regional diagenetic evolution;the pressure line of E_2s_2 formation is parallel to the hydrostatic pressure and moreover the pressure coefficient decreases with the depth increases,as a overpressure connecting transmission.The dissolution & redistribution of the carbonate cements in the overpressure mothballing box and the retardation of the clay minerals by the overpressure are the main controlling factors of the generation of the high-porosity belts in the deep part.

关键词(KeyWords)： 沙二段储层;成岩特征;异常高孔带;次生孔隙;连通传递超压;溶蚀作用
E_2s_2 reservoir;diagenetic characteristic;abnormal high-porosity belt;secondary pore;overpressure connection and transference;dissolution

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“渤海海域已证实的富生烃凹陷再评价及新领域勘探方向”(2011ZX05023-001-004)

作者(Author): 冯冲,王清斌,杨波,朱文森,赵国祥
FEGN Chong,WANG Qingbin,YANG Bo,ZHU Wensen,ZHAO Guoxiang

参考文献(References)：

• [1]武文来,周士科.渤海海域深部碎屑岩储层孔隙度预测[J].中国海上油气,1997,11(4):240-248.
• [2]蒋恕,蔡东升,朱筱敏,等.辽东湾地区孔隙演化的机理[J].地球科学,2007,32(3):366-342.
• [3]鲍晓欢,郝芳,方勇.东营凹陷超压储层的不同类型及其成藏意义[J].大庆石油地质与开发,2007,26(5):33-36.
• [4]张云峰,王国强,付宝利,等.长岭断陷深层碎屑岩储层成岩作用及异常高孔带成因[J].吉林大学学报:地球科学版,2011,41(2):372-376.
• [5]刘清俊,于炳松,贾丽云,等.塔里木盆地志留系柯坪塔格组砂岩储层成岩作用[J].大庆石油地质与开发,2012,31(2):18-25.
• [6]汪新光,张建光,魏忠元,等.伊通地堑鹿乡断陷储层成岩作用特征[J].大庆石油地质与开发,2009,28(2):29-32.
• [7]周心怀,刘震,李潍莲.辽东湾断陷油气成藏机理[M].北京:石油工业出版社,2009.
• [8]李潍莲,刘震,夏庆龙,等.辽东湾凝析气田超压成因及侧向传递机制初探[J].地质科学,2008,43(2):377-388.
• [9]张琴,唐玄,庞正炼.鄂尔多斯盆地杭锦旗探区二叠系低孔渗储层主控因素分析[J].大庆石油地质与开发,2011,30(3):45-50.
• [10]李海华,张彦霞,王保华.长岭断陷层碎屑岩成岩作用与次生孔隙[J].大庆石油地质与开发,2010,29(5):30-34.
• [11]Bloch S,Lander R H,Bonnell L.Anomalously high porosity and permeability in deeply buried sandstone reservoirs:Origin and predictability[J].AAPG Bulletin,2002,86(2):301-328.
• [12]应凤祥,何东博,龙玉梅,等.SY/T 5477—2003中华人民共和国石油天然气行业标准——碎屑岩成岩阶段划分[S].北京:石油工业出版社,2003.
• [13]孟元林,李亚光,牛嘉玉,等.渤海湾盆地北部深层碎屑岩储层孔隙度影响因素探讨[J].中国海上油气,2007,19(3):154-161.
• [14]Deming D,Cranganu C,Lee Youngmin.Self-sealing in sedimentary basins[J].Geophysical Research:Solid Earth,2002,107(12):12-20.
• [15]解习农,李思田,刘晓峰.异常压力盆地流体动力性[M].武汉:中国地质大学出版社,2006.
• [16]Giles M R,De Boer R B.Origin and significance of redistributional secondary porosity[J].Marine and Petroleum Geology,1990(7):379-397.
• [17]徐同台,王行信,张有瑜,等.中国含油气盆地黏土矿物[M].北京:石油工业出版社,2003.
• [18]李忠,费伟红,寿建峰,等.华北东濮凹陷异常高压与流体活动及其对储集砂岩成岩作用的制约[J].地质学报,2003,77(1):126-133.