CAJ | 학술논문

碳酸盐岩地层中的岩溶储层十分常见,但在碎屑岩地层研究中,却很少见到关于岩溶储层的报道.在对冀东油田老爷庙地区古近系东营组储层研究项目中,发现碎屑岩同样存在岩溶储层,而且其分布规律和控制因素与碳酸盐岩岩溶储层十分相似.东营组砂岩储层为三角洲—湖泊沉积,钙质胶结十分普遍.根据岩心和测井资料分析发现,砂岩岩溶储层发育在新近系和古近系之间的区域不整合面之下,孔隙主要是由砂岩中钙质胶结物溶蚀产生的.根据岩心和测井资料统计分析,不整合面之下砂岩岩溶储层带的厚度为150 m左右.因此,对于钙质胶结的砂岩来说,不整合面之下是有利储层发育带.
탄산염암지층중적암용저층십분상견,단재쇄설암지층연구중,각흔소견도관우암용저층적보도.재대기동유전로야묘지구고근계동영조저층연구항목중,발현쇄설암동양존재암용저층,이차기분포규률화공제인소여탄산염암암용저층십분상사.동영조사암저층위삼각주—호박침적,개질효결십분보편.근거암심화측정자료분석발현,사암암용저층발육재신근계화고근계지간적구역불정합면지하,공극주요시유사암중개질효결물용식산생적.근거암심화측정자료통계분석,불정합면지하사암암용저층대적후도위150 m좌우.인차,대우개질효결적사암래설,불정합면지하시유리저층발육대.
Carbonate karst reservoir is very common, but no reports on clastic karst reservoir. The clastic karst reservoirs have been discovered in the Paleogene Dongying Formation in the Jidong Laoyemiao oil field in this study. The distribution and control factors of the clastic karst reservoir are very similar to those of the carbonate karst reservoir. The sedimentary facies of sandstone reservoir of the Dongying Formation is delta. Within sandstone reservoir, calcareous cementation is widespread. Based on the core and log data analysis, sandstone karst reservoir developed in a zone of 150 m in thickness below an unconformity between the Neogene and Paleogene strata. The porosity of the sandstone karst reservoir is mainly produced by the dissolution of calcareous cements. We suggest that a zone below unconformity is favorable to reservoir development for calcareous sandstone.