摘要
通过桩海地区下古生界的岩心描述和镜下观察,探讨了埋藏溶蚀作用的特征,建立了埋藏溶蚀作用的识别标志。碳酸盐岩溶洞中有机和无机气液两相包体共生普遍,并与全烃包体伴生,发黄绿色荧光。包裹体均一温度主要为90℃~150℃,具有"双峰"分布特征。δ13C值为-2.2^-3.5;δ18O值为-17.4^-13.2,与加里东期裂缝和印支期裂缝充填物的同位素值相比,埋藏期溶洞充填物碳同位素值具有明显向高值迁移、氧同位素具有向低值迁移的特征。包裹体均一温度和稳定同位素数据支持埋藏溶蚀作用的存在。文中还对研究区桩古10井下古生界储集空间发育特征进行了分析,认为桩古10井残留的马家沟组灰岩受后期埋藏溶蚀作用显著,各种次生的溶蚀洞、扩容缝和溶孔为主要储集空间,储集空间类型为复合型。复合型孔隙的形成主要是孤北洼陷巨厚的第三系沉积物压释水沿边界断层向高部位的桩西潜山运移,作用于桩古10井区的下古生界,在埋藏条件下产生溶蚀而形成。
Through Paleozoic cores description and microscope observation in Zhuanghai area, the paper discussed the feature of buried modification, built up recognition sign of buried modification. The organic and inorganic gas-liquid bi-phase inclusions with bright orange-yellow luminescent in carbonate cavern generally are intergrowth. Homogenization temperature of inclusion is from 901 to 150℃ ,with bi-pick mode. The staple isotope data show that the mean value of δ3 C is from -2. 2 to -3. 5, the mean value of δ18O is from -17. 4to -13. 2. In comparison with isotopic data of infill in Caledonian and Indosinian fractures, the carbon-isotopic data infill of buried cavern is characteristic migrating toward higher data and oxygen-isotopic value toward lower data. Homogenization temperature of aqueous inclusion and table isotopic data also sustain the function of late buried modification. The paper analyzed the development character of Paleozoic reserve space at the well Zhuanggu-10, and believed that residual Majiagou Formation carbonate in well Zhuanggu-10 was significantly affected by later buried modification; a various secondary modification cavity, fissure and bore are major reserve space,the type of which is complex. The formation of complex pore is caused by that the press-dispel-water of giant-thick Tertiary sediments coming from Gubei sag migrated along the boundary fault to highness of Zhuangxi buried hill,acted on Paleozoic carbonate of well Zhuanggu-10 and produced buried modification in buried condition.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2007年第5期591-596,共6页
Oil Geophysical Prospecting
关键词
埋藏溶蚀
储集性
下古生界
桩古10井
桩海地区
buried modification,reserve character,Paleozoic,well Zhuanggu-10,Zhuanggu area
