文档介绍：西峰油田延长组长8油层组储层描述
摘要
应_L}j偏光显微镜、阴极发光、扫描电镜及矧像分析等实验室常用的分析测试技术,并结地球物理洲井技术、岩芯描述、野外露头观察研究_广阿峰油出二叠系延长组}:=8油层绢储的沉积相、储层岩fi学、储层成岩作用、储层的孔隙结构特征及对储层的影响冈素,井指有利的勘探目标区块。
曲峰油田二瞢系延K纠长8储层为湖泊三角洲相沉积,研究区以浅湖相沉积为主,并址角洲甲原相沉移!。上要沉积微相为水F分流河道、河口坝、远砂坝、席状砂、大然堤、决扇等。总体I:为F细}_-粗的反粒序旋同,为典犁的二三角洲沉积。平面上K=8砂层发育订曲一尔北方向上的6~7条砂体向前缘深入深湖区。
储层砂岩以细一中粒岩屑K-n-砂岩、长打岩屑砂岩等为卡,桦屑组分以K_i、√1英、、高喷发岩岩届是研究区跃8储层的典14特征。成岩臼生矿物以绿泥√一质、铁力解fi等为主。平而上不同的研究区具有不同的成岩矿物组合:镇原砂体以桥状伊 ll一绿泥_l为上,自马地区_t要以绿泥*i为主,董志地区主要以高岭fi为主,合水一。i:县
R则为绿泥f卜硅质一铁方解fi等为主。对储层储集性能影响的主要网素彳J沉积和成岩鹏方面。水P分流河道砂体是{ij|=究区最好的储集层,粒度粗,分选好,云僻等软组分含鼍低, 间孔发育,}j{『缘席状砂、河El坝、远砂坝等粒度相对较细,云母等软组分含耸高,储集性
逐渐‘蓬芳。研究区长8储层属j:低渗特低渗透储层,有以粒间孔为主和以溶孔为主的两类储层,孔
度小j:12%,×lO u m2,平均喉道--'F-径4,T- u m,排驱压力一般
O 5MPa以上,储层孔隙结构分为四人类六小类,其中I、『叮产出低产I:业油流。平面上相对优质储层主要分布ji自地区、曲47井区、董忠地区的曲33一曲39井区。根据沉积相带、砂体展布规律、孔渗 i【E、孔隙组合、成岩区带特征等预测Ⅱ}3个有利勘探区块,即桐川地眨、、
水【州城川地区。
关键词:IW峰油田 K 8储层沉积相 成岩作IL}I孔隙结构储层评价
The description of Chang 8 Oil-bearing beds of Yanchang Formation
in Xifeng Oilfield
Abstract:Applied with Polarizing microscope,cathodoluminescence,Scanning Electron Microscope,image analysis and other analytic bining geophysical description and outcrop observation,the sedimentary facies,reservoir
digenesis,pore texture and influences on reservoir of Chang 8,Yanchang Formation of the Triassic period in Xifeng Oilfield are studied,
Yanchang Formation of Triassic in Xifeng Oilfield developed Lake Delta lake facies are mainly developed and delta plain can be found in the area,The main sedimentary prise distributary channel,mouth bar,distal bar,blanket sand,natural levee and crevasse 8 is typical delta deposit which has reverse grain size order in ascending -7 sandbodies of Chang 8 that deposited from southwest to northeast rate into deep
lake region.
The reservoir sandstone is fine-medium grained lithic arkose and felspathic lithoclast sandstone The main constituents of Clastic are fe