吉林大学学报(地球科学版)
吉林大學學報(地毬科學版)
길림대학학보(지구과학판)
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
5期
1451-1465
,共15页
葸克来%操应长%周磊%赵贤正%金凤鸣%杨春宇%苏芮%董雄英
葸剋來%操應長%週磊%趙賢正%金鳳鳴%楊春宇%囌芮%董雄英
사극래%조응장%주뢰%조현정%금봉명%양춘우%소예%동웅영
物性下限%有效储层%控制因素%成因机制%廊固凹陷
物性下限%有效儲層%控製因素%成因機製%廊固凹陷
물성하한%유효저층%공제인소%성인궤제%랑고요함
physical properties parameter cutoff%effective reservoir%controlling factor%genetic mechanism%Langgu depression
中深层有效储层成因机制一直是中深层油气勘探备受关注的内容。综合运用岩心观察、薄片鉴定、物性分析及流体包裹体分析等技术手段,研究了廊固凹陷河西务构造带沙四上亚段储层岩石学特征、储集特征及成岩作用特征,并在有效储层物性下限计算的基础上,分析了有效储层物性控制因素,总结了有效储层成因机制,建立了有效储层成因模式。研究表明:廊固凹陷河西务构造带沙四上亚段储层以岩屑质长石砂岩为主,含少量长石质岩屑砂岩,成分成熟度中等,结构成熟度高;压实作用较强,胶结作用南北差异性明显,溶解作用弱;储层储集空间以原生孔隙为主,含少量的粒内溶孔及粒间溶扩孔隙,孔渗相关性好。储层胶结物含量、分选系数、沉积微相及地层压力是廊固凹陷河西务构造带沙四上亚段有效储层形成的主要控制因素。辫状河三角洲前缘分支河道沉积环境中杂基含量少、分选好、碳酸盐岩屑含量低的细砂岩、中粗砂岩及含砾砂岩是沙四上亚段有效储层形成的有利物质基础。早期地层超压,抑制压实作用,保护原生孔隙;早期油气充注,抑制胶结作用与压实作用,保护孔隙空间。二者共同作用,是有效储层形成的主要原因。溶解作用少量增孔,颗粒边缘形成的早期石英加大抑制压实,对有效储层的形成起辅助作用。
中深層有效儲層成因機製一直是中深層油氣勘探備受關註的內容。綜閤運用巖心觀察、薄片鑒定、物性分析及流體包裹體分析等技術手段,研究瞭廊固凹陷河西務構造帶沙四上亞段儲層巖石學特徵、儲集特徵及成巖作用特徵,併在有效儲層物性下限計算的基礎上,分析瞭有效儲層物性控製因素,總結瞭有效儲層成因機製,建立瞭有效儲層成因模式。研究錶明:廊固凹陷河西務構造帶沙四上亞段儲層以巖屑質長石砂巖為主,含少量長石質巖屑砂巖,成分成熟度中等,結構成熟度高;壓實作用較彊,膠結作用南北差異性明顯,溶解作用弱;儲層儲集空間以原生孔隙為主,含少量的粒內溶孔及粒間溶擴孔隙,孔滲相關性好。儲層膠結物含量、分選繫數、沉積微相及地層壓力是廊固凹陷河西務構造帶沙四上亞段有效儲層形成的主要控製因素。辮狀河三角洲前緣分支河道沉積環境中雜基含量少、分選好、碳痠鹽巖屑含量低的細砂巖、中粗砂巖及含礫砂巖是沙四上亞段有效儲層形成的有利物質基礎。早期地層超壓,抑製壓實作用,保護原生孔隙;早期油氣充註,抑製膠結作用與壓實作用,保護孔隙空間。二者共同作用,是有效儲層形成的主要原因。溶解作用少量增孔,顆粒邊緣形成的早期石英加大抑製壓實,對有效儲層的形成起輔助作用。
중심층유효저층성인궤제일직시중심층유기감탐비수관주적내용。종합운용암심관찰、박편감정、물성분석급류체포과체분석등기술수단,연구료랑고요함하서무구조대사사상아단저층암석학특정、저집특정급성암작용특정,병재유효저층물성하한계산적기출상,분석료유효저층물성공제인소,총결료유효저층성인궤제,건립료유효저층성인모식。연구표명:랑고요함하서무구조대사사상아단저층이암설질장석사암위주,함소량장석질암설사암,성분성숙도중등,결구성숙도고;압실작용교강,효결작용남북차이성명현,용해작용약;저층저집공간이원생공극위주,함소량적립내용공급립간용확공극,공삼상관성호。저층효결물함량、분선계수、침적미상급지층압력시랑고요함하서무구조대사사상아단유효저층형성적주요공제인소。변상하삼각주전연분지하도침적배경중잡기함량소、분선호、탄산염암설함량저적세사암、중조사암급함력사암시사사상아단유효저층형성적유리물질기출。조기지층초압,억제압실작용,보호원생공극;조기유기충주,억제효결작용여압실작용,보호공극공간。이자공동작용,시유효저층형성적주요원인。용해작용소량증공,과립변연형성적조기석영가대억제압실,대유효저층적형성기보조작용。
The origin of effective reservoir in mid-deep clastic reservoir has always been the popular research content of petroleum exploration.The reservoir petrological characteristic,physical properties and diagenetic characteristics of the upper part of the Fourth Member of the Shahejie Formation(Es s4 ) were systematically studied through cores observation,rock thin section identification,physical properties analysis and fluid-inclusion analysis,et al in Hexiwu structural zone of Langgu depression . Moreover,the authors analyzed controlling factors of effective reservoirs on the basis of the physical properties parameter cutoff calculation,summarized the genetic mechanism and established the genetic model of effective reservoirs.The results show that the rocks of Es s4 reservoirs are mainly composed of lithic arkose and a small amount of feldspthic lithic sandstone,and they have medium compositional maturity and high structural maturity.In diagenesis,compaction is strong,cementation is obviously difference in north and south,and dissolution is weak.The reservoirs have more primary and less dissolution pores,so porosity and permeability correlation is well.Reservoir cement content,sorting coefficient,sedimentary microfacies and formation pressure are the main controlling factors of effective reservoirs.The fine sandstone,moderate coarse sandstone and pebbled sandstone with little matrix contents,well sorted,and little carbonate debris in branch channel of braided delta front are favorable material foundation in effective reservoirs forming process.Early overpressure restrained compaction and protected primary pore,also early hydrocarbon charging restrained cementation and protected pore space.They both together contributed the main reason for the formation of effective reservoir.In addition,dissolution formed a little amount of secondary pore and early quartz overgrowths around particles edge restrained compaction, which played supporting roles in the formation of effective reservoir.