石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2013年
4期
516-521
,共6页
李启桂%李克胜%周卓铸%燕继红%唐欢阳
李啟桂%李剋勝%週卓鑄%燕繼紅%唐歡暘
리계계%리극성%주탁주%연계홍%당환양
古地貌%碳酸盐岩%岩溶储层%桐湾不整合%四川盆地
古地貌%碳痠鹽巖%巖溶儲層%桐灣不整閤%四川盆地
고지모%탄산염암%암용저층%동만불정합%사천분지
palaeogeomorphology%carbonate rock%karst reservoir%Tongwan unconformity%Sichuan Basin
四川盆地震旦系灯影组风化壳岩溶储层的分布主要受桐湾期不整合面古地貌的古高地、古斜坡的控制。利用全盆的地震格架大剖面解释资料和钻井资料,结合厚度印模法,恢复了桐湾不整合面古地貌,古地貌特征呈西北高、中部斜坡、东南洼的格局。综合利用野外、钻井、地震等资料,深入分析灯影组溶蚀孔洞发育特征和有利岩溶发育带。结果表明,岩溶风化壳溶蚀孔洞发育,广泛发育3个岩溶作用带,岩溶作用厚度呈东薄西厚的变化趋势;岩溶有利发育分布区和较发育分布区主要分布在古岩溶斜坡的地貌位置,以自贡-广安-达县-通江县一线为好,局部发育分布区位于古岩溶高地及古岩溶洼地的地貌位置,分布在成都-资阳地区、绵阳-广元地区及川东南一带。
四川盆地震旦繫燈影組風化殼巖溶儲層的分佈主要受桐灣期不整閤麵古地貌的古高地、古斜坡的控製。利用全盆的地震格架大剖麵解釋資料和鑽井資料,結閤厚度印模法,恢複瞭桐灣不整閤麵古地貌,古地貌特徵呈西北高、中部斜坡、東南窪的格跼。綜閤利用野外、鑽井、地震等資料,深入分析燈影組溶蝕孔洞髮育特徵和有利巖溶髮育帶。結果錶明,巖溶風化殼溶蝕孔洞髮育,廣汎髮育3箇巖溶作用帶,巖溶作用厚度呈東薄西厚的變化趨勢;巖溶有利髮育分佈區和較髮育分佈區主要分佈在古巖溶斜坡的地貌位置,以自貢-廣安-達縣-通江縣一線為好,跼部髮育分佈區位于古巖溶高地及古巖溶窪地的地貌位置,分佈在成都-資暘地區、綿暘-廣元地區及川東南一帶。
사천분지진단계등영조풍화각암용저층적분포주요수동만기불정합면고지모적고고지、고사파적공제。이용전분적지진격가대부면해석자료화찬정자료,결합후도인모법,회복료동만불정합면고지모,고지모특정정서북고、중부사파、동남와적격국。종합이용야외、찬정、지진등자료,심입분석등영조용식공동발육특정화유리암용발육대。결과표명,암용풍화각용식공동발육,엄범발육3개암용작용대,암용작용후도정동박서후적변화추세;암용유리발육분포구화교발육분포구주요분포재고암용사파적지모위치,이자공-엄안-체현-통강현일선위호,국부발육분포구위우고암용고지급고암용와지적지모위치,분포재성도-자양지구、면양-엄원지구급천동남일대。
The distribution of weathering crust karst reservoirs of the Sinian Dengying Formation in Sichuan Basin is mainly controlled by palaeo-highlands and palaeo-slopes of unconformity produced by the Tongwan Movement .Based on the interpretation of the cross-basin seismic profile and drilling data ,this paper restored the palaeogeomorphology of Tong-wan unconformity by using printing method .The palaeogeomorphology features in a framework consisting of the northwes-tern high,central slope and southeastern sag .Outcrop,drilling and seismic data were integrated to study the development characteristics of the solution cavities and pores and predict favorable karst reservoirs in the Dengying Formation .It is concluded that solution cavities and pores are well developed in the karst weathering crust with three widely distributed karst belts .The karst is thick in the west and thin in the west .The favorable and fair karst belts occur on the palaeo-karst slopes,such as Zigong-Guangan-Daxian-Tongjiang.And the local karst belts occur on the palaeo-karst high and in the palaeo-karst sag ,such as Chengdu-Ziyang ,Mingyang-Guangyuan as well as the south-eastern part of Sichuan Basin .