燕山地区冀北坳陷雾迷山组白云岩类型及储集特征
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摘要
燕山地区冀北坳陷雾迷山组(Jxw)白云岩分布广泛,厚度大,是区内油气勘探的重要目标层位之一。利用碳氧同位素、电子探针、阴极发光、扫描电镜等分析、测试资料,对燕山地区白云岩的类型及其储集性能进行了分析。根据白云岩晶体结构与原始沉积特征,将其划分为泥晶-粉晶白云岩、叠层石白云岩、颗粒白云岩、粗粉晶-细晶白云岩、中晶-粗晶白云岩等5种类型。白云岩储集空间组合类型以裂缝-孔隙型为主,孔隙主要为次生孔隙。以粗粉晶-细晶白云岩的孔隙结构最好,其次为泥-粉晶白云岩。从野外油苗调查结果来看,孔隙演化与油气成藏具有良好的匹配关系,可形成的裂缝-孔隙型油藏。
Dolomite from Wumishan Formation(Jxw)in Yanshan Area,which was extensively distributed with big thickness,was one of the important target zones of oil and gas exploration in the region.Based on data of core samples,thin section,carbon and oxygen isotope analysis,electron microprobe,cathodoluminescence,scanning electron microscopy and the testing data,the reservoir type and characteristics of the dolomites in Wumishan Formation of the northern Hebei Depression were investigated.According to the crystal structure and the original sedimentary characteristics of the dolomite,they are divided into 5categories,such as dolomicrite,stromatolite dolomite,grain dolomite,coarse silt sized-fine crystal dolomite,midium-coarse crystal dolomite.Their reservoir space is mainly fractural-pore type.The reservoir space in dolomite is predominated by secondary porosity.Coarse powder-fine-grained dolomite reservoir is the best in performance,mud-dolomite powder dolomite is the next.Field investigation of oil seepage show that porosity evolution and hydrocarbon accumulation are well matched,it is possible to form a good fracture-porosity reservoir.
Dolomite from Wumishan Formation(Jxw)in Yanshan Area,which was extensively distributed with big thickness,was one of the important target zones of oil and gas exploration in the region.Based on data of core samples,thin section,carbon and oxygen isotope analysis,electron microprobe,cathodoluminescence,scanning electron microscopy and the testing data,the reservoir type and characteristics of the dolomites in Wumishan Formation of the northern Hebei Depression were investigated.According to the crystal structure and the original sedimentary characteristics of the dolomite,they are divided into 5categories,such as dolomicrite,stromatolite dolomite,grain dolomite,coarse silt sized-fine crystal dolomite,midium-coarse crystal dolomite.Their reservoir space is mainly fractural-pore type.The reservoir space in dolomite is predominated by secondary porosity.Coarse powder-fine-grained dolomite reservoir is the best in performance,mud-dolomite powder dolomite is the next.Field investigation of oil seepage show that porosity evolution and hydrocarbon accumulation are well matched,it is possible to form a good fracture-porosity reservoir.
引文
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[4]郝石生.华北北部中-上元古界石油地质学[M].东营:石油大学出版社,1990.
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[8]欧光习,李林强.辽西-冀北坳陷中-上元古界油源及成藏期分析[J].矿物岩石地球化学通报,2006,25(1):87~91.
[9]邵龙义.碳酸盐岩氧、碳同位素与古温度等的关系[J].中国矿业大学学报,1994,23(1):39~45.
[10]王勇.“白云岩问题”与“前寒武纪之谜”研究进展[J].地球科学进展,2006,21(8):857~862.
[11]张学丰,胡文王宣,张军涛.白云岩成因相关问题及主要形成模式[J].地质科技情报,2006,25(5):32~40.
[12]汤朝阳,王敏,姚华舟,等.白云石化作用及白云岩问题研究述评[J].东华理工学院学报,2006,29(3):205~210.
[13]孙健,董兆雄,郑琴.白云岩成因的研究现状及相关发展趋势[J].海相油气地质,2005,10(3):25~30.