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时间:2020-03-23
《东濮凹陷文东地区沙三段储集层硬石膏胶结的形成机制.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVo1.34No.4,July,2015东濮凹陷文东地区沙三段储集层硬石膏胶结的形成机制马鹏杰,张世奇,佟昕,魏孟吉,刘卫彬,慕小水1.中国石油大学(华东)地球科学与技术学院,山东青岛266580;2.中国石化中原油田分公司,河南濮阳457001摘要:为明确东濮凹陷文东地区沙三段储集层硬石膏胶结的形成机制,对其开展了薄片鉴定、包裹体测温及扫描电镜分析。结果表明,文东地区沙三段储集层硬石膏以斑块状胶结为主
2、,处于中成岩A一中成岩B期。盐岩溶解增大了硫酸钙的溶解度,使得硬石膏发育的储集层,硫酸钙饱和系数多大于140;其物质来源主要包括:古沉积水、膏盐岩溶解、阳离子交替吸附作用、长石与碳酸盐胶结物的溶蚀及斜长石钠长石化。硬石膏胶结在垂向上多发育在与膏盐岩及含膏泥岩临近的储集层,平面上主要发育在膏盐岩分布的边缘、与砂岩层呈指状交互的区域,油气充注及裂缝是Ca”和s0一注入储集层的主要途径。关键词:硬石膏;饱和系数;吸附作用;Fisher判别;东濮凹陷中图分类号:TEl22.2文章编号:1007—2802(2015)04—0772-
3、08doi:10.3969/j.issn.1007—2802.2015.04.O11TheFormingMechanismofAnhydriteCementationintheEs3SandstoneReservoiroftheWendongArea,DongpuDepressionMAPeng.jie,ZHANGShi.qi,TONGXin,WEIMeng—ji,LIUWei—bin,MUXiao-shui1.CollegeofEarthScienceandTechnology,ChinaUniversityofPetr
4、oleum(EastChina),Qingdao,Shandong266580,China;2.ResearchInstituteofPetroleumExplorationandfroduction,ZhongyuanOilField,S1NOPEC,Puyang457001,ChinaAbstract:TomakeclearoftheformingmechanismofanhydritecementationintheEs,sandstonereservoiroftheWendongarea,Dongpudepress
5、ion,thinsectionanalysis,micorscopicthermometrytechnologyofinclusionandscanningelectronmicroscopywereapplied.ResuhshowedthatanhydritecementationintheEs3sandstonereservoiroftheWendongareaarepatchy,whichmainlydevelopedinthemiddlediageneticstageofAandB.Thesolubilityof
6、calciumsulfateincreasedsinceofthedissolutionofsaltrocks,andthesaturationcoefficientofcalciumsulfateinsandstonereservoirswaslargerthan140.Itsmaterialsourcesmainlyincluded:ancientsedimentarywater,gypsum—saltrocksdissolution,cationalterna—tiveadhesiveaction,dissoluti
7、onoffeldsparandcarbonatecementsandthealbitizationofplagioclase.Vertically,thereser—voirscontaininganhydritecementationmainlydistributednearthegypsum-saltrocksandgypsummudstones,horizontally,theydistributedattheedgeofgypsum·saltrockswheregypsum—saltrocksandsandston
8、esinterfingeredtogether.Hydrocar—bonfillingandoverpressuredfractureswerethemainwaysforCaands0一enteringthereservoirs.Keywords:anhydrite;saturationcoefici
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