塔里木盆地古城地区下古生界白云岩储层类型及成因TYPES AND GENESES OF THE DOLOMITE RESERVOIRS IN LOWER PALEOZOIC OF GUCHENG AREA OF TARIM BASIN
邵红梅,冯子辉,王成,卢曦,王彦凯,高波
SHAO Hongmei,FENG Zihui,WANG Cheng,LU Xi,WANG Yankai,GAO Bo
摘要(Abstract)：
通过对古城地区寒武系、下奥陶统白云岩进行岩石薄片、扫描电镜、阴极发光显微镜精细鉴定,结合碳氧同位素、有序度等地化分析,从白云石晶体大小、形态、表面特征、阴极发光现象,以及地化特征指标等方面,总结了古城地区发育准同生期、早—中成岩期、中—晚成岩期3期4种白云化作用形成的6种类型白云石,分别为准同生期蒸发泵成因的粉—微晶白云石、准同生期渗透回流成因的粉—细晶他形白云石、浅埋藏成因的粉—中晶较自形白云石、后期热液成因的中—粗晶脏白云石、中—粗晶较干净白云石和鞍形白云石等6种类型。白云化作用和热液溶蚀作用形成的晶间孔、晶间溶孔、溶蚀缝孔洞是白云岩的主要储集空间,白云岩溶蚀孔隙型和白云岩溶蚀缝孔洞型储层是古城地区有效的储层类型。
Through the careful and fine observation and identification of Cambrian and Lower Ordovician dolomite samples by means of rock thin sections,SEM and cathode luminescent microscope combined with the geochemical analyses of the carbon and oxygen isotopes,order degree of the dolomite etc.,six kinds of three-period(penecontemporaneous,middle-late diagenetic and late diagenetic periods) four-type dolomitized dolomites are developed and summarized in Gucheng area:powder-microcrystal dolomite caused by the syngenetic evaporating pump dolomitization in the first period;anhedral powder-microcrystalline dolomite resulted from the penecontemporaneous seepage reflux dolomitization;idiomorphic powder-medium crystalline dolomite made from the shallow burial dolomitization;dirty and clean medium-coarse crystalline and saddle dolomites because of late hydrothermal dolomitization.The intergranular pores,intergranular dissolved pores,dissolved seams and holes formed by the dolomitizations and hydrothermal dissolution are the main reservoir accumulating spaces(AS) of the dolomite,the dissolvedpore and dissolved-seam/hole type reservoirs are the effective AS forms in Gucheng area.
关键词(KeyWords)：
白云化作用;热液溶蚀;白云岩储层;古城地区
Dolomitization;hydrothermal dissolution;dolomite reservoir;Gucheng area
基金项目(Foundation): 国家重大科技专项“大型油气田及煤层气开发”(2011ZX05001-001-004)
作者(Author):
邵红梅,冯子辉,王成,卢曦,王彦凯,高波
SHAO Hongmei,FENG Zihui,WANG Cheng,LU Xi,WANG Yankai,GAO Bo
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