陈波,陈汾君,马进业,石正灏,孙国强,史基安
CHEN Bo,CHEN Fenjun,MA Jinye,SHI Zhenghao,SUN Guoqiang,SHI Ji'an

• 1:中国科学院油气资源研究重点实验室
• 2:钦州学院石油与化工学院
• 3:中国科学院大学
• 4:中国石油青海油田分公司勘探开发研究院

摘要(Abstract)：

综合运用岩石学、矿物学及碳氧同位素等理论,对冷湖地区上干柴沟组储层的碳酸盐胶结类型、形成机理及其对储层物性的影响进行了研究。结果表明:上干柴沟组发育两期碳酸盐胶结物,成岩早期碳酸盐胶结物大多是孔隙流体中碳酸钙达到过饱和形成的,沉淀时温度较低,δ13C、δ18O值大,自形程度较好,多以微晶或泥晶团块似"连晶式"胶结于粒间孔隙中,该胶结物在一定程度上增强了岩石骨架颗粒固结和抗压实能力,且是后期有机酸的主要溶蚀对象,对储层物性起到促进作用;成岩中—晚期碳酸盐胶结物主要来自有机酸脱酸作用相关的碳酸盐,δ13C值、δ18O值小,沉淀时温度较高,多以分散式形态出现在粒间孔隙中,该胶结物形成时间较晚,往往位于粒间孔隙和部分溶蚀孔隙中,对储层物性起到破坏作用。
By comprehensively adopt the theories such as petrology,mineralogy,carbon- oxygen isotope and so on,the following researches were conducted: types of the carbonate cements,genetic mechanism and their impacts on the reservoir physical properties for Shanganchaigou Formation reservoirs in Lenghu area. The achievements show that two periods of the cements are developed in the formation,the carbonate cements in the early period are mostly resulted from the over-saturation of the calcium carbonate in the pore liquid,the temperature are lower when they are precipitated,the values of δ13C and δ18O are rather bigger,the euhedral degree is much better,they are"crystal stock type"cemented in the intergranular pores in the principal forms of microcrystalline or micritic briquette,so the consolidation and compaction resistance ability are enhanced to a certain for the rock skeleton particles,and moreover they become the main corroded objects for the late organic acids,and possess positive and improving effects on the physical properties of the reservoirs; the cements in the middle-late period are generally from the carbonates which are relative with the deacidification of the organic acid,their values of δ13C and δ18O are rather lower,and the temperatures are pretty higher when precipitating,mostly in the intergranular pores in a scattered form,formed in relatively late time,often occupied in the intergranular partial dissolved pores,so they are destructive to the physical properties of the reservoirs.

关键词(KeyWords)： 柴达木盆地;冷湖地区;新近系;碳酸盐胶结物;碳氧同位素;胶结物成因机理
Qaidam Basin;Lenghu area;Paleogene;carbonate cement;carbon-oxygen isotope;cement forming/genetic mechanism

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“盆地深层多种烃源岩演化分析与模拟技术”(2011ZX05008-002);; 甘肃省重点实验室专项(1309RTSA041)

作者(Author): 陈波,陈汾君,马进业,石正灏,孙国强,史基安
CHEN Bo,CHEN Fenjun,MA Jinye,SHI Zhenghao,SUN Guoqiang,SHI Ji'an

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